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1 - Introduction
Test Bed Receiver Subsystem Addendum – Rev 1 9
OPERATIONAL OVERVIEW
The NovAtel Test Bed Receiver has two functional blocks (see Figure 2):
• Single Frequency GPS GLONASS
• Dual Frequency GPS GEO
Figure 2 Test Bed Receiver Functional Block Diagram
RF/IF
Digitizing
BACKPLANE: Communication and Time Synchronization
Serial Ports Strobe Port
CLK/STATUS
CARD
10 MHz
OCXO
10 MHz
Ext. Osc.
Input
+/- 12 VDC
POWER
SUPPLY
5 VDC
22-30 VDC
Power
L1/L2 GPS
RF/IF
Digitizing
L1/L2 GPS
L1 GEO
RF/IF
Digitizing
Antenna
Input
10 MHz
Int. Osc.
Output
External
Jumper
L1/L2-I
L1/L2-II
GEO Processing
Specific channels on the GPS GEO card have the capability to receive and process the GEO WAAS signal. The signal is
in-band at L1 and is identified with WAAS-specific PRN numbers. The WAAS message is decoded and separated into
its various components. The WAAS message and associated pseudorange is provided as an output.
GLONASS