Fine range-motion simulation for hardware-in-the-loop testing of monostatic-pulsed LFM radars

Richard F. Olson Jr.

doi:10.1117/12.885470

13 May 2011 Fine range-motion simulation for hardware-in-the-loop testing of monostatic-pulsed LFM radars

Richard F. Olson Jr.

Proceedings Volume 8015, Technologies for Synthetic Environments: Hardware-in-the-Loop XVI; 80150E (2011) https://doi.org/10.1117/12.885470
Event: SPIE Defense, Security, and Sensing, 2011, Orlando, Florida, United States

Abstract

Frequency stepping is an established technique for increasing the range resolution of pulsed Linear Frequency Modulation (LFM, or chirp) radar waveforms [1]. When a monostatic radar system employs this waveform for increased range resolution measurements on an object with motion relative to the radar platform, simple changes in the received waveform arise, requiring fine motion compensation on a per-pulse basis. These motion effects include phase, frequency and frequency slope offsets which vary according to the transmitted pulse frequency and frequency rate, and the object range and range rate. All three offsets are easily compensated by complementary offsets in Direct Digital Synthesizer outputs used to form frequency conversion LO signals in the radar receiver. Radars employing stepped frequency LFM waveforms may be tested in a Hardware-in-the-Loop (HWIL) facility in simulations involving scenes or objects with radar-relative motion. Under these conditions, the motion effects on the radar receiver input signals must be accurately computed, synthesized and must modify the transmit signal prior to its return to the receiver. Engineers at the U.S. Army AMRDEC Advanced Simulation Center have developed signal processing techniques for accurate simulation of fine range motion effects to support HWIL testing of pulsed LFM radar systems. This paper provides an analysis of the signal processing involved for a simple model of an HWIL RF signal generation chain. Some results are presented from successful application of the motion simulation methods in an HWIL test setting.

Citation Download Citation

Richard F. Olson Jr. "Fine range-motion simulation for hardware-in-the-loop testing of monostatic-pulsed LFM radars", Proc. SPIE 8015, Technologies for Synthetic Environments: Hardware-in-the-Loop XVI, 80150E (13 May 2011); https://doi.org/10.1117/12.885470

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