Ultra Wide Band Signal Modeling for Radar Receiver Characterization
Master's thesis, Jan-Dec 2004
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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Results for modeling, simulation, and analysis of interference effects that modern wideband signals have on existing narrowband radar system performance are presented. In particular, radar detection performance is characterized using a basic radar receiver model and operational parameters consistent with those of the ARSR-4 air route surveillance radar. Two modern wideband signals interferers are addressed in this work, including the GPS military signal M-Code signal and a direct sequence ultra wideband DS-UWB waveform meeting outdoor emission restrictions imposed by the Federal Communications Commission FCC. Interference effects are characterized for an unmodulated sinusoidal pulse as well as linear frequency modulated LFM and bi-phase Barker coded pulse compression waveforms. Finally, coherent pulse integration is addressed and interference mitigation demonstrated via improved detection performance. Worst case detection scenarios from the radars perspective are considered for all cases. M-Code interference results indicate that at proposed received power levels of -160 to -130 dBW, radar detection performance is severely degraded with expected improvement occurring when pulse integration is employed. DS-UWB interference results indicate that at maximum transmit power levels specified by the FCC, the DS-UWB waveform has minimal impact on detection performance for radar receiverUWB transmitter separation distances beyond 0.5 meters. This separation distance is reduced further when pulse integration is employed. 8 tables, 42 figures, 25 refs.
- Active and Passive Radar Detection and Equipment