National Academies Press: OpenBook

The Global Positioning System: A Shared National Asset (1995)

Chapter: SCENARIO 1: UNAIDED Y-CODE BANDWIDTH SIGNAL WITH A STANDARD ANTENNA

« Previous: Appendix L Enhanced Signal Structures for the Military
Suggested Citation:"SCENARIO 1: UNAIDED Y-CODE BANDWIDTH SIGNAL WITH A STANDARD ANTENNA." National Research Council. 1995. The Global Positioning System: A Shared National Asset. Washington, DC: The National Academies Press. doi: 10.17226/4920.
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APPENDIX L 256 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 Code Loop Carrier Loop Aiding Tracking Tracking Bandwidth Bandwidth 1 Y-code Standard No 1.0 Hz (20 MHz) (Baseline) Bandwidth Antenna 20 MHz 2 Y-code Standard Yes 1.0 Hz 1.0 Hz (Baseline) Bandwidth Antenna (aided) (aided) (20 Hz) 3 Y-code Nulling Antenna Yes 0.1 Hz 1.0 Hz (Baseline) Bandwidth (25 dB nulls) (aided) (aided) (20 MHz) 4 Wide Standard No 1.0 Hz 20 Hz Bandwidth Antenna (200 MHz) 5 Wide Standard Yes 1.0 Hz 1.0 Hz Bandwidth Antenna (aided) (aided) (200 MHz) 6 Wide Miniature Yes 0.1 Hz 1.0 Hz Bandwidth Antenna (aided) (aided) (200 MHz) (25 dB nulls) 7 Wide Null/ Yes 0.1 Hz 1.0 Hz Bandwidth Beamforming (aided) (aided) (200 MHz) Antenna (31 dB nulls and 6 dB beam gain) 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.

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The Global Positioning System (GPS) is a satellite-based navigation system that was originally designed for the U.S. military. However, the number of civilian GPS users now exceeds the military users, and many commercial markets have emerged. This book identifies technical improvements that would enhance military, civilian, and commercial use of the GPS. Several technical improvements are recommended that could be made to enhance the overall system performance.

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