Subject:	R/V Knorr POS/MV installation for Glad 800Equipment Status
Project:	Knorr POS/MV
Created:	August 7, 2002
Updated:
Engineer:	Dale Chayes
Doc No.:	N/A
Revision:	-

 

Her is a quick run down on the pieces and sizes:

 

1        PCU:

This is a standard rack mount unit. A view from the back is shown in Figure 1. It requires 4 1/2” of rack space. Although the unit is not particularly deep, a clear depth of about 18” is required to allow for connectors and cable bends.

Figure 1: Back view of the POS/MV-320 PCS

2        Antennas:

The likely collection of GPS antennas is shown in Figure 2. The two GPS antennas that are part of the POS/MV-320 are from Novatel and will be mounted in choke rings on the cross bar of the antenna mast. We will provide two additional GPS receivers for the GLAD-800 cruise. One is a Trimble AG-132 satellite (and USCG RF) differential receiver and the other is a Garmin 17 WAAS receiver.

2.1      Antenna masts:

Figure 6 shows the antenna mast arrangement on the R/V Thompson. In this case the antenna mast was installed on the aft (starboard) edge of the top of the pilot house.

 

Figure 7 shows the mast arrangement on the R/V Ewing. In this case, we installed a new mast on the deck aft of the pilot house and forward of the stack. The cross tree is a about the height of the stack. There is moderate multipath from the platform of the mast above the pilot house. During the refit the main mast will most likely be lowered and its platform will be reduced which should reduce the multipath.

 

Figure 2: The collection of antennas. The POS/MV uses two Novatel antennas. One is shown mounted in a choke ring at the back left and the other without at the left front. In the back right is the antenna for the Trimble AG-132 satellite differential GPS receiver and at the right front is the Garmin 17 WAAS receiver.

Figure 3: The POS/MV Inertial Measurement Unit (IMU)

 

3        POS/MV IMU:

The Inertial measurement unit shown in Figure 3 will be mounted on a foundation near the existing HIPPY platform. We will provide drawings for the mounting arrangement that we have used in the past.

4        Cables

4.1      POS/MV GPS cables

A pair of will cables runs from the back of the PCU to the POS/MV GPS antennas on the top of the hanger. The example cables shown in Figure 4 are short cables. We may need longer cables in which case the diameter will increase a bit along with the bend radius. Each cable is terminated with Type-N connectors on both ends.

Type N connectors are approximately 16mm OD. This cable is 12mm OD.

Figure 4: POS/MV-320 GPS antenna cables. These are “short” (20m) cables. Longer cable runs will require slightly larger diameter cable.

4.2      POS/MV IMU cable:

One cable will run between the PCS in the main lab and the IMU. An example IMU cable is shown in Figure 5. Note that this is a short cable and if we require a longer cable, the cable diameter will increase somewhat. The cable is terminated on both ends with MS connectors. The connectors are 30mm OD and this cable is 10mm OD.

Figure 5: POS/MV IMU cable.

 

 

Figure 6: POS/MV Antenna mast on R/V Thompson

 

 

Figure 7: POS/MV mast on the Ewing