Time-frequency techniques applied to ISAR imaging of aircraft

Trygve Sparr

doi:10.1117/12.421214

26 March 2001 Time-frequency techniques applied to ISAR imaging of aircraft

Trygve Sparr

Proceedings Volume 4391, Wavelet Applications VIII; (2001) https://doi.org/10.1117/12.421214
Event: Aerospace/Defense Sensing, Simulation, and Controls, 2001, Orlando, FL, United States

Abstract

The key to successful ISAR imaging is frequency estimation, as the cross range position of scatteres on the target is determined from the differential Doppler shifts of the received radar signal. Many ISAR images are blurred when conventional processing is used. We show that such blurring can result because the full complexity of the target motion is not taken into account. A sufficiently general model shows that the Doppler shifts are time dependent. We give an example using a quadratic time-frequency method on radar data of an aircraft. Irregular motion is detected, and sharp images are formed in the case where the conventional ISAR processor gave a blurred image. The complexity of the target motion was verified using motion reference data.

Citation Download Citation

Trygve Sparr "Time-frequency techniques applied to ISAR imaging of aircraft", Proc. SPIE 4391, Wavelet Applications VIII, (26 March 2001); https://doi.org/10.1117/12.421214

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