author | A.M. Thurnherr <ant@ldeo.columbia.edu> |
Tue, 08 Jul 2014 21:50:22 -0400 | |
changeset 14 | f7f35d9629ab |
parent 0 | 0a450563f904 |
child 22 | 624b1ed6e9c9 |
permissions | -rw-r--r-- |
0
0a450563f904
VIX_6: first version for Mercurial release
A.M. Thurnherr <ant@ldeo.columbia.edu>
parents:
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1 |
function [d,p]=getbtrack(d,p); |
0a450563f904
VIX_6: first version for Mercurial release
A.M. Thurnherr <ant@ldeo.columbia.edu>
parents:
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|
2 |
% function [d,p]=getbtrack(d,p); |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
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3 |
% |
0a450563f904
VIX_6: first version for Mercurial release
A.M. Thurnherr <ant@ldeo.columbia.edu>
parents:
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4 |
% create own bottom track in addition to the one used before |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
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5 |
% |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
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6 |
|
0a450563f904
VIX_6: first version for Mercurial release
A.M. Thurnherr <ant@ldeo.columbia.edu>
parents:
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|
7 |
% force own distance to RDI bottom track |
0a450563f904
VIX_6: first version for Mercurial release
A.M. Thurnherr <ant@ldeo.columbia.edu>
parents:
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8 |
p=setdefv(p,'bottomdist',0); |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
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|
9 |
% "manual" bottom track for down looker |
0a450563f904
VIX_6: first version for Mercurial release
A.M. Thurnherr <ant@ldeo.columbia.edu>
parents:
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10 |
p=setdefv(p,'btrk_mode',3); |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
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11 |
% p.btrk_ts is in dB to detect bottom above bin1 level (for own btm track) |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
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12 |
p=setdefv(p,'btrk_ts',10); |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
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13 |
% p.btrk_below gives bin used below target strength maximum |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
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14 |
p=setdefv(p,'btrk_below',0.5); |
0a450563f904
VIX_6: first version for Mercurial release
A.M. Thurnherr <ant@ldeo.columbia.edu>
parents:
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15 |
% p.btrk_range gives range of allowed bottom track ranges |
0a450563f904
VIX_6: first version for Mercurial release
A.M. Thurnherr <ant@ldeo.columbia.edu>
parents:
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16 |
p=setdefv(p,'btrk_range',[300 50]); |
0a450563f904
VIX_6: first version for Mercurial release
A.M. Thurnherr <ant@ldeo.columbia.edu>
parents:
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17 |
% maximum allowed difference between reference layer W and W bottom track |
0a450563f904
VIX_6: first version for Mercurial release
A.M. Thurnherr <ant@ldeo.columbia.edu>
parents:
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18 |
p=setdefv(p,'btrk_wlim',0.05); |
0a450563f904
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19 |
|
0a450563f904
VIX_6: first version for Mercurial release
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parents:
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20 |
p=setdefv(p,'btrk_used',0); |
0a450563f904
VIX_6: first version for Mercurial release
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21 |
|
0a450563f904
VIX_6: first version for Mercurial release
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22 |
disp('GETBTRACK creates own bottom track in addition to RDI') |
0a450563f904
VIX_6: first version for Mercurial release
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23 |
|
0a450563f904
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24 |
% convert echo amplitude to relative target strength |
0a450563f904
VIX_6: first version for Mercurial release
A.M. Thurnherr <ant@ldeo.columbia.edu>
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25 |
% at=0.039; % attenuation dB/m for 150 kHz |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
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26 |
% at=0.062; % attenuation dB/m for 300 kHz |
0a450563f904
VIX_6: first version for Mercurial release
A.M. Thurnherr <ant@ldeo.columbia.edu>
parents:
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27 |
if d.down.Frequency==300, |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
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28 |
p=setdefv(p,'ts_att_dn',0.06); |
0a450563f904
VIX_6: first version for Mercurial release
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29 |
else |
0a450563f904
VIX_6: first version for Mercurial release
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30 |
p=setdefv(p,'ts_att_dn',0.039); |
0a450563f904
VIX_6: first version for Mercurial release
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31 |
end |
0a450563f904
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32 |
d.tg(d.izd,:)=targ(d.ts(d.izd,:),d.zd,p.ts_att_dn); |
0a450563f904
VIX_6: first version for Mercurial release
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33 |
|
0a450563f904
VIX_6: first version for Mercurial release
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34 |
if length(d.izu)>0 |
0a450563f904
VIX_6: first version for Mercurial release
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35 |
if d.up.Frequency==300, |
0a450563f904
VIX_6: first version for Mercurial release
A.M. Thurnherr <ant@ldeo.columbia.edu>
parents:
diff
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|
36 |
p=setdefv(p,'ts_att_up',0.06); |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
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37 |
else |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
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38 |
p=setdefv(p,'ts_att_up',0.039); |
0a450563f904
VIX_6: first version for Mercurial release
A.M. Thurnherr <ant@ldeo.columbia.edu>
parents:
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|
39 |
end |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
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|
40 |
d.tg(d.izu,:)=targ(d.ts(d.izu,:),d.zu,p.ts_att_up); |
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VIX_6: first version for Mercurial release
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41 |
end |
0a450563f904
VIX_6: first version for Mercurial release
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42 |
|
0a450563f904
VIX_6: first version for Mercurial release
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43 |
% save bin number where down looker starts |
0a450563f904
VIX_6: first version for Mercurial release
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44 |
ib1=d.izd(1)-1; |
0a450563f904
VIX_6: first version for Mercurial release
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45 |
nbin=length(d.izd); |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
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46 |
|
0a450563f904
VIX_6: first version for Mercurial release
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parents:
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|
47 |
disp([' in: p.btrk_mode ',int2str(p.btrk_mode),' and p.btrk_used ',int2str(p.btrk_used)]) |
0a450563f904
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48 |
|
0a450563f904
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49 |
if p.btrk_mode>=1 |
0a450563f904
VIX_6: first version for Mercurial release
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50 |
if p.btrk_ts>0 |
0a450563f904
VIX_6: first version for Mercurial release
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51 |
|
0a450563f904
VIX_6: first version for Mercurial release
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52 |
disp(' using increased bottom echo amplitudes to create bottom track') |
0a450563f904
VIX_6: first version for Mercurial release
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|
53 |
% don't use first bin |
0a450563f904
VIX_6: first version for Mercurial release
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54 |
fitb1=1; |
0a450563f904
VIX_6: first version for Mercurial release
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55 |
zd=d.zd(fitb1:end); |
0a450563f904
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56 |
ead=d.tg(d.izd(fitb1:end),:); |
0a450563f904
VIX_6: first version for Mercurial release
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57 |
% fit parabola to locate bottom |
0a450563f904
VIX_6: first version for Mercurial release
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58 |
[zmead,mead,imead]=localmax2(zd',ead); |
0a450563f904
VIX_6: first version for Mercurial release
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59 |
imead=imead+fitb1-1; |
0a450563f904
VIX_6: first version for Mercurial release
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60 |
dts=mead-ead(1,:); |
0a450563f904
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61 |
|
0a450563f904
VIX_6: first version for Mercurial release
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62 |
% decide which bin to use for bottom velocities |
0a450563f904
VIX_6: first version for Mercurial release
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63 |
dz=abs(diff(d.zd(1:2))); |
0a450563f904
VIX_6: first version for Mercurial release
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64 |
% imeadbv=round(imead+p.btrk_below); |
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VIX_6: first version for Mercurial release
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65 |
imeadbv=round((zmead-d.zd(1))/dz+1+p.btrk_below); |
0a450563f904
VIX_6: first version for Mercurial release
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66 |
|
0a450563f904
VIX_6: first version for Mercurial release
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67 |
if p.btrk_used==1 |
0a450563f904
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|
68 |
if p.bottomdist==0 |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
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|
69 |
% check RDI bottom track only if non zero |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
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|
70 |
ii=find(d.hbot<min(p.btrk_range)); |
0a450563f904
VIX_6: first version for Mercurial release
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|
71 |
if length(ii)>0 |
0a450563f904
VIX_6: first version for Mercurial release
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|
72 |
disp([' found ',int2str(length(ii)),' bottom depth below btrk_range ',... |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
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|
73 |
int2str(min(p.btrk_range))]) |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
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|
74 |
d.bvel(ii,:)=nan; |
0a450563f904
VIX_6: first version for Mercurial release
A.M. Thurnherr <ant@ldeo.columbia.edu>
parents:
diff
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|
75 |
d.hbot(ii)=nan; |
0a450563f904
VIX_6: first version for Mercurial release
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|
76 |
end |
0a450563f904
VIX_6: first version for Mercurial release
A.M. Thurnherr <ant@ldeo.columbia.edu>
parents:
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|
77 |
ii=find(d.hbot>max(p.btrk_range)); |
0a450563f904
VIX_6: first version for Mercurial release
A.M. Thurnherr <ant@ldeo.columbia.edu>
parents:
diff
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|
78 |
if length(ii)>0 |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
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|
79 |
disp([' found ',int2str(length(ii)),' bottom depth above btrk_range ',... |
0a450563f904
VIX_6: first version for Mercurial release
A.M. Thurnherr <ant@ldeo.columbia.edu>
parents:
diff
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|
80 |
int2str(max(p.btrk_range))]) |
0a450563f904
VIX_6: first version for Mercurial release
A.M. Thurnherr <ant@ldeo.columbia.edu>
parents:
diff
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|
81 |
d.bvel(ii,:)=nan; |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
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|
82 |
d.hbot(ii)=nan; |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
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|
83 |
end |
0a450563f904
VIX_6: first version for Mercurial release
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|
84 |
end |
0a450563f904
VIX_6: first version for Mercurial release
A.M. Thurnherr <ant@ldeo.columbia.edu>
parents:
diff
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|
85 |
% save RDI bottom track |
0a450563f904
VIX_6: first version for Mercurial release
A.M. Thurnherr <ant@ldeo.columbia.edu>
parents:
diff
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|
86 |
d.bvel_rdi=d.bvel; |
0a450563f904
VIX_6: first version for Mercurial release
A.M. Thurnherr <ant@ldeo.columbia.edu>
parents:
diff
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|
87 |
d.hbot_rdi=d.hbot; |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
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|
88 |
ii=find(isfinite(d.bvel(:,1)+d.bvel(:,2))); |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
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|
89 |
if length(ii)<10, |
0a450563f904
VIX_6: first version for Mercurial release
A.M. Thurnherr <ant@ldeo.columbia.edu>
parents:
diff
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|
90 |
disp(' found less than 10 RDI bottom track values, try own') |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
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|
91 |
p.btrk_used=0; |
0a450563f904
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|
92 |
end |
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|
93 |
end |
0a450563f904
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|
94 |
|
0a450563f904
VIX_6: first version for Mercurial release
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parents:
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|
95 |
disp([' use ',num2str(p.btrk_below),... |
0a450563f904
VIX_6: first version for Mercurial release
A.M. Thurnherr <ant@ldeo.columbia.edu>
parents:
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|
96 |
' bins below maximum target strength for own bottom track velocity']) |
0a450563f904
VIX_6: first version for Mercurial release
A.M. Thurnherr <ant@ldeo.columbia.edu>
parents:
diff
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|
97 |
% locate acceptable bottom tracks (don't accept first/last bin) |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
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|
98 |
ii=find(dts>p.btrk_ts & ... |
0a450563f904
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99 |
zmead>min(p.btrk_range) & zmead<max(p.btrk_range) & ... |
0a450563f904
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parents:
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|
100 |
imeadbv<(nbin-1) & imeadbv>fitb1); |
0a450563f904
VIX_6: first version for Mercurial release
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|
101 |
|
0a450563f904
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102 |
if length(ii)>0 |
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103 |
|
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|
104 |
% save bottom distance data |
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|
105 |
d.hbot_own=d.hbot+NaN; |
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|
106 |
d.hbot_own(ii)=zmead(ii); |
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|
107 |
|
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|
108 |
% force bottom distance if RDI mode fails to report distance |
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|
109 |
if p.bottomdist | p.btrk_mode==2 | p.btrk_used~=1 |
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|
110 |
d.hbot=d.hbot_own; |
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|
111 |
disp([' created ',int2str(length(ii)),... |
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|
112 |
' bottom distances']) |
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|
113 |
if p.bottomdist, p.btrk_used = 12; end |
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|
114 |
else |
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|
115 |
disp([' created ',int2str(length(ii)),... |
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|
116 |
' bottom distances keeping original']) |
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|
117 |
end |
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|
118 |
|
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|
119 |
% make bottom velocity data |
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|
120 |
bv=d.bvel+NaN; |
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|
121 |
|
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|
122 |
for j=1:length(ii) |
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|
123 |
ji=ii(j); |
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|
124 |
bv(ji,1)=medianan(d.ru(ib1+imeadbv(ji)+[-1,0,0,1],ji)); |
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|
125 |
bv(ji,2)=medianan(d.rv(ib1+imeadbv(ji)+[-1,0,0,1],ji)); |
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|
126 |
bv(ji,3)=medianan(d.rw(ib1+imeadbv(ji)+[-1,0,0,1],ji)); |
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|
127 |
bv(ji,4)=medianan(d.re(ib1+imeadbv(ji)+[-1,0,0,1],ji)); |
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|
128 |
end |
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|
129 |
|
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|
130 |
% check for W-bot |
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|
131 |
wref=medianan(d.rw(d.izd,:),2); |
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|
132 |
ii=find(abs(wref'-bv(:,3))>p.btrk_wlim); |
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|
133 |
disp([' removed ',int2str(length(ii)),... |
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|
134 |
' bottom track profiles W_btrk - W_ref difference > ',num2str(p.btrk_wlim)]) |
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|
135 |
bv(ii,:)=nan; |
0a450563f904
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|
136 |
|
0a450563f904
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|
137 |
% check for outlier |
0a450563f904
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|
138 |
bv=boutlier(bv,d.hbot_own,p); |
0a450563f904
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|
139 |
d.bvel_own=bv; |
0a450563f904
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parents:
diff
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|
140 |
ii=find(isfinite(bv(:,1)+bv(:,2))); |
0a450563f904
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parents:
diff
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|
141 |
|
0a450563f904
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|
142 |
if (p.btrk_used~=1 & p.btrk_used~=12) | p.btrk_mode==2 |
0a450563f904
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parents:
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|
143 |
p.btrk_used = 2; |
0a450563f904
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|
144 |
d.bvel=d.bvel_own; |
0a450563f904
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parents:
diff
changeset
|
145 |
disp([' created ',int2str(length(ii)),... |
0a450563f904
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parents:
diff
changeset
|
146 |
' bottom track data from normal velocities']) |
0a450563f904
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parents:
diff
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|
147 |
else |
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parents:
diff
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|
148 |
disp([' created ',int2str(length(ii)),... |
0a450563f904
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parents:
diff
changeset
|
149 |
' bottom track velocities keeping original']) |
0a450563f904
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parents:
diff
changeset
|
150 |
end |
0a450563f904
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parents:
diff
changeset
|
151 |
|
0a450563f904
VIX_6: first version for Mercurial release
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diff
changeset
|
152 |
else |
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diff
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|
153 |
if (p.btrk_used~=1 & p.btrk_used~=12) |
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|
154 |
p.btrk_used = -1; |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
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|
155 |
end |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
156 |
disp(' did not find any bottom echos to create own bottom track ') |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
157 |
end |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
158 |
else |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
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|
159 |
disp(' no valid own bottom track. Increase target strength difference ? ') |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
160 |
end |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
161 |
else |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
162 |
disp('force no bottom track data ') |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
163 |
p.btrk_used = -1; |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
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|
164 |
d.bvel=d.bvel+nan; |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
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|
165 |
d.hbot=d.hbot+nan; |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
166 |
end |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
167 |
% summary output |
0a450563f904
VIX_6: first version for Mercurial release
A.M. Thurnherr <ant@ldeo.columbia.edu>
parents:
diff
changeset
|
168 |
disp([' out: p.btrk_mode ',int2str(p.btrk_mode),' and p.btrk_used ',int2str(p.btrk_used)]) |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
169 |
|
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
170 |
%================================= |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
171 |
function [bvel,p] = boutlier(bvel,hbot,p); |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
172 |
% function [bvel,p] = boutlier(bvel,hbot,p); |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
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|
173 |
% |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
174 |
% |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
175 |
% input : bvel bottom track velocity |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
176 |
% n factor for outlier rejection |
0a450563f904
VIX_6: first version for Mercurial release
A.M. Thurnherr <ant@ldeo.columbia.edu>
parents:
diff
changeset
|
177 |
% n(1)*rms(data) first sweep |
0a450563f904
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parents:
diff
changeset
|
178 |
% n(2)*rms(data) second sweep etc. |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
179 |
% |
0a450563f904
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parents:
diff
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|
180 |
% output : d changed LADCP analysis data structure |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
181 |
% |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
182 |
% version 0.1 last change 27.6.2000 |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
183 |
|
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
184 |
n=p.outlier; |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
185 |
nblock=p.outlier_n; |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
186 |
|
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
187 |
dummyb = bvel*0; |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
188 |
if size(dummyb,2)~=4, disp(' no data '), return, end |
0a450563f904
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parents:
diff
changeset
|
189 |
|
0a450563f904
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diff
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|
190 |
si = size(dummyb); |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
191 |
sn = ceil(si(1)/nblock); |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
192 |
|
0a450563f904
VIX_6: first version for Mercurial release
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diff
changeset
|
193 |
|
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
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|
194 |
lob=length(find(isnan(dummyb))); |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
195 |
|
0a450563f904
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parents:
diff
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|
196 |
for i=1:length(n) |
0a450563f904
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parents:
diff
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|
197 |
for m=1:sn |
0a450563f904
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diff
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|
198 |
ind = (m-1)*nblock+[1:nblock]; |
0a450563f904
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parents:
diff
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|
199 |
ii = find( ind<=si(1) ); |
0a450563f904
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parents:
diff
changeset
|
200 |
ind = ind(ii); |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
201 |
% bottom track |
0a450563f904
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parents:
diff
changeset
|
202 |
bvelt(ind,1)=bvel(ind,1)-medianan(bvel(ind,1)); |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
203 |
bu = find(abs(bvelt(ind,1))>n(i)*rms(bvelt(ind,1))); |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
204 |
dummyb(ind(bu),:)=nan; |
0a450563f904
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parents:
diff
changeset
|
205 |
bvelt(ind,2)=bvel(ind,2)-medianan(bvel(ind,2)); |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
206 |
bv = find(abs(bvelt(ind,2))>n(i)*rms(bvelt(ind,2))); |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
207 |
dummyb(ind(bv),:)=nan; |
0a450563f904
VIX_6: first version for Mercurial release
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parents:
diff
changeset
|
208 |
bw = find(abs(bvel(ind,3))>n(i)*rms(bvel(ind,3))); |
0a450563f904
VIX_6: first version for Mercurial release
A.M. Thurnherr <ant@ldeo.columbia.edu>
parents:
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dummyb(ind(bw),:)=nan; |
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hbot(ind)=hbot(ind)-medianan(hbot(ind)); |
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bh = find(abs(hbot(ind))>n(i)*rms(hbot(ind))); |
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dummyb(ind(bh),:)=nan; |
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213 |
end |
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bvel = bvel + dummyb; |
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hbot = hbot + dummyb(:,1)'; |
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216 |
end |
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disp([' boutlier removed ',int2str(length(find(isnan(dummyb)))-lob),... |
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218 |
' bottom track velocities ']) |
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219 |
return |
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220 |
|
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221 |
% |
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function y = rms(x,dim) |
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%RMS root-mean square. For vectors, RMS(x) returns the standard |
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224 |
% deviation. For matrices, RMS(X) is a row vector containing |
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225 |
% the root-mean-square of each column. The difference to STD is |
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% that here the mean is NOT removed. |
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227 |
% RMS(X,DIM) returns the root-mean-square of dimension DIM |
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228 |
% |
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% See also STD,COV. |
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230 |
% |
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231 |
|
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232 |
% Uwe Send, IfM Kiel, Apr 1992 |
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233 |
% added NaN handling Gerd Krahmann, IfM Kiel, Oct 1993, Jun 1994 |
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234 |
% removed bug in NaN handling G.Krahmann, Aug 1994 |
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% added compatibility to MATLAB 5 G.Krahmann, LODYC Paris, Jul 1997 |
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236 |
|
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237 |
|
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238 |
if nargin<2 |
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239 |
dim=min(find(size(x)>1)); |
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240 |
end |
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241 |
|
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242 |
if all(isnan(x)) |
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243 |
y=nan; |
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244 |
return |
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245 |
end |
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246 |
|
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247 |
x = shiftdim(x,dim-1); |
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248 |
s = size(x); |
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249 |
so = s(1); |
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250 |
s(1) = 1; |
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251 |
|
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252 |
for n = 1:prod(s) |
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253 |
good = find(~isnan(x(:,n))); |
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254 |
if ~isempty(good) |
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255 |
y(1,n) = norm( x(good,n) ) / sqrt(length(good)); |
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256 |
else |
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257 |
y(1,n) = NaN; |
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258 |
end |
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259 |
end |
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260 |
y = reshape(y,s); |
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261 |
y = shiftdim( y, ndims(x)-dim+1 ); |
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262 |
|
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263 |
|
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264 |
%================================================ |
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265 |
function [ts,bcs]=targ(ea,dis,at,bl,eas,ap) |
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266 |
% function [ts,bcs]=targ(ea,dis,at,bl,eas,ap) |
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267 |
% Target strength of EA for volume scatterer |
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268 |
% ea = echoamp in dB |
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269 |
% dis = distance in m |
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270 |
% at = attenuation dB/m |
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271 |
% bl = pulse/bin legth in m |
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272 |
% eas = source level |
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273 |
% ap = aperature in degree |
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274 |
% M. Visbeck 2004 |
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275 |
|
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276 |
% make distance matrix if needed |
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277 |
[lr,lc]=size(ea); |
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278 |
|
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279 |
if size(dis,2)==1 | size(dis,1)==1 |
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280 |
dis=dis(:); |
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281 |
dis=repmat(dis,[1,lc]); |
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282 |
end |
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283 |
|
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284 |
if nargin<3 |
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285 |
at=0.039; % attenuation dB/m for 150 kHz |
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286 |
at=0.062; % attenuation dB/m for 300 kHz |
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287 |
end |
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288 |
|
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289 |
|
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290 |
%binlength |
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291 |
if nargin<4 , bl=median(abs(diff(dis(:,1)))); end |
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292 |
|
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293 |
% source level in dB |
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294 |
if nargin <5, eas=100; end |
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295 |
|
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296 |
% beam aperature in DEGREE convert to radian |
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297 |
if nargin <6, ap=2; end |
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298 |
al=ap*pi/180; |
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299 |
|
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300 |
% radius of top and bottom of each bin |
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301 |
r1=tan(al)*(dis-bl/2); |
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302 |
r2=tan(al)*(dis+bl/2); |
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303 |
|
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304 |
% ensonified volume |
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305 |
v=pi*bl/3*(r1.^2+r2.^2+r1.*r2); |
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306 |
|
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307 |
% transmission loss |
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308 |
tl=20*log10(dis)+at*dis; |
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309 |
|
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310 |
% target strength |
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311 |
ts=ea-eas+2*tl-10*log10(v); |
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312 |
|
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313 |
if nargout>1 |
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314 |
%backscatter cross section |
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315 |
bcs=exp(ts./10); |
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316 |
end |