Chapter 11 361
GPS Modulation
Real Time GPS
Setting Up a GPS Bit Error Rate Test
This section shows how to make GPS BER measurements using the ESG Signal Generator with
Option UN7.
The following procedures explain how to set up the ESG for making BER measurements:
• “Connecting the Test Equipment” on page 362
• “Setting the Carrier Frequency and Power Level” on page 362
• “Selecting the Data Format” on page 363
• “Setting Up the GPS Receiver” on page 363
• “Selecting the BERT Data Pattern and Total Bits” on page 363
• “Selecting the BERT Trigger” on page 364
• “Starting BERT measurements” on page 364
Required Equipment
The following equipment is required to make BER measurements.
• ESG Signal Generator, model E4438C with Options 001/601or 002/602, 409, and UN7
• an external controller to control the receiver under test
• a 20dB attenuator
• a level-matching circuit between the receiver under test and the signal generator when the receiver signal
specifications are different from those of the signal generator
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