A Comparison of Measured Jamming Mitigation Performance from Field Tests with Predictions from Hardware-Based CRPA Simulations and Analytic Simulations

Charles Behre, Frank Ziolkowski, Paul Grobert and James Hvizd

Abstract:	Raytheon’s El Segundo facility has developed a hardware-based Controlled Pattern Reception Antenna (CRPA) simulator integrated with a GPS signal simulator. This paper first describes the components of the CRPA station and the process by which test scenarios are created and conducted. This is followed by a comparison of test results with both data taken in the field and data produced by an analytic simulation. Results from field tests conducted for the Joint Precision Approach and Landing System (JPALS) program were recorded for two anti-jam (AJ) GPS systems, the Trimble Force 5 receiver in combination with the GAS-1 antenna electronics (AE) system and the AGR-8 AJ receiver. The test conditions were modeled analytically to create control files for the CRPA station hardware. Lab data was collected for both AJ systems. Results show that the data collected using the CRPA simulator output is in very good agreement with the analytic results and in good agreement with the field tests. Generally, the C/No data produced in the CRPA simulations matches the trends and fluctuations of the field tests and analytic results. The absolute levels are also in good agreement, but observed biases between the results suggest that more work needs to be performed on gain and loss calibrations and the antenna model fidelity.
Published in:	Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002) September 24 - 27, 2002 Oregon Convention Center Portland, OR
Pages:	655 - 666
Cite this article:	Behre, Charles, Ziolkowski, Frank, Grobert, Paul, Hvizd, James, "A Comparison of Measured Jamming Mitigation Performance from Field Tests with Predictions from Hardware-Based CRPA Simulations and Analytic Simulations," Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002), Portland, OR, September 2002, pp. 655-666.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In