Agilent Technologies E8257C PSG Uživatelská příručka stáhnout pdf (Strana 224)

210 Chapter 8

GPS Modulation (Option 409)

Real Time GPS

This real-time personality simulates GPS satellite transmissions for single channel receiver testing. Basic

GPS signal building capabilities include:

• P code generation at 10.23 Mcps with the standard GPS 10.23 Mcps reference

• C/A code generation at 1.023 Mcps with the standard GPS 10.23 Mcps reference

• navigation data output at 50 bps using PN9, PN15, a fixed 4-bit pattern, a user-defined file, or default

data (TLM mode) for encoding with the C/A code or the C/A + P code

• three selectable ranging codes: C/A, P, or C/A+P

• satellite ID range of 1 to 32 with an additional range of 33 to 37 for other uses

• selectable data modes: Raw, Encoded, and TLM

• simulated doppler shift with a 250 kHz range

• selectable internal or external chip clock reference source

The signal generator’s pre-defined GPS signal setup includes a C/A ranging code, a satellite ID of 1, zero

doppler shift, a 10.23 Mcps reference clock, and the Raw data mode enabled, using PN9 data.

The satellite ID numbers match the pseudorandom numbers used to generate the C/A and P codes and

dictate the amount of chip delay in compliance with the GPS standards.

The following advanced features are also available:

• P code power adjustment (40 to 0 dB)

• adjustable chip clock reference (1 kcps to 12.5 Mcps)

• selectable I/Q phase

• selectable filters and the ability to create user-defined filters

1. P code signals are spectrally correct but do not contain valid data.

1 2 ... 219 220 221 222 223 224 225 226 227 228 229 ... 317 318

Žádné komentáře

Agilent Technologies E8257C PSG Uživatelská příručka Strana 224