National Academies Press: OpenBook

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

Chapter: SCENARIO 5: AIDED WIDE BANDWIDTH STANDARD ANTENNA

« Previous: SCENARIO 1: UNAIDED Y-CODE BANDWIDTH SIGNAL WITH A STANDARD ANTENNA
Suggested Citation:"SCENARIO 5: AIDED WIDE BANDWIDTH 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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Page 257

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APPENDIX L 257 SCENARIO 2: AIDED Y-CODE BANDWIDTH WITH A STANDARD ANTENNA For comparison purposes, a baseline of an aided Y-code bandwidth GPS receiver operating with a standard antenna will be used. SCENARIO 3: AIDED Y-CODE BANDWIDTH WITH NULLING ANTENNA For comparison purposes, a baseline of an aided Y-code bandwidth GPS receiver operating with a nulling antenna will be used. SCENARIO 4: UNAIDED WIDE BANDWIDTH WITH STANDARD ANTENNA This scenario is compared with the baseline described in Scenario 1. Receiver Thermal Noise Limited Case In this condition, the four times higher radio carrier frequency will give a free-space carrier-to-noise ratio disadvantage of 12 dB. Above the code-tracking loop threshold, the 12 dB loss is more than offset by increased signal bandwidth. Multipath susceptibility is reduced by factors of 10 and 100, respectively, over Y-code and C/ A-code. Noise Jammer Limited Case Importantly, any increase in free-space loss with frequency is equal for both the interference source and the GPS satellite. With the narrower code chip of the wide-band signal structure, better calibration of the constellation will be needed. SCENARIO 5: AIDED WIDE BANDWIDTH STANDARD ANTENNA The comparative baseline is the aided Y-code receiver operating with a standard antenna, Scenario 2. Receiver Thermal Noise Limited Case In this condition, the four times higher radio carrier frequency will give a free-space carrier-to-noise ratio disadvantage of 12 dB. Above the code-tracking loop threshold, the 12 dB loss is more than offset by increased signal bandwidth. Multipath susceptibility is reduced by factors of 10 and 100, respectively, over Y-code and C/ A-code.

Next: SCENARIO 7: AIDED WIDE BANDWIDTH WITH NULLING AND BEAM-FORMING ANTENNA »
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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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