The Global Positioning System: A Shared National Asset (1995)
Chapter: SCENARIO 1: UNAIDED Y-CODE BANDWIDTH SIGNAL WITH A STANDARD ANTENNA
frequency increase was predicted. In each scenario, attention was given to the thermal noise limited region and the interference limited region. For military users in a combat environment, receiver and thermal noise is negligible compared with jamming power.
Table L-1 Summary of Seven Signal Scenarios with Different Bandwidths, Antennas, and Inertial Aiding
|
Scenario |
Bandwidth |
Antenna Used |
Inertial Aiding |
Code Loop Tracking Bandwidth |
Carrier Loop Tracking Bandwidth |
|
1 (Baseline) |
Y-code Bandwidth 20 MHz |
Standard Antenna |
No |
1.0 Hz |
(20 MHz) |
|
2 (Baseline) |
Y-code Bandwidth (20 Hz) |
Standard Antenna |
Yes |
1.0 Hz (aided) |
1.0 Hz (aided) |
|
3 (Baseline) |
Y-code Bandwidth (20 MHz) |
Nulling Antenna (25 dB nulls) |
Yes |
0.1 Hz (aided) |
1.0 Hz (aided) |
|
4 |
Wide Bandwidth (200 MHz) |
Standard Antenna |
No |
1.0 Hz |
20 Hz |
|
5 |
Wide Bandwidth (200 MHz) |
Standard Antenna |
Yes |
1.0 Hz (aided) |
1.0 Hz (aided) |
|
6 |
Wide Bandwidth (200 MHz) |
Miniature Antenna (25 dB nulls) |
Yes |
0.1 Hz (aided) |
1.0 Hz (aided) |
|
7 |
Wide Bandwidth (200 MHz) |
Null/ Beamforming Antenna (31 dB nulls and 6 dB beam gain) |
Yes |
0.1 Hz (aided) |
1.0 Hz (aided) |
Scenario 1: Unaided Y-Code Bandwidth Signal With A Standard Antenna
For comparison purposes, a baseline of an unaided Y-code bandwidth GPS receiver operating with a standard antenna will be used.
