Wideband SAR processing with segmented chirps for phased-array radars

A. W. Doerry

doi:10.1117/12.717801

2 May 2007 Wideband SAR processing with segmented chirps for phased-array radars

A. W. Doerry

Proceedings Volume 6547, Radar Sensor Technology XI; 654702 (2007) https://doi.org/10.1117/12.717801
Event: Defense and Security Symposium, 2007, Orlando, Florida, United States

Abstract

Fine resolution Synthetic Aperture Radar (SAR) requires wideband signals to be transmitted and received. Electronically steered phased-array antennas have difficulty steering wideband signals without the use of expensive and cumbersome true time delay elements. Otherwise more desirable phase shifters are by themselves inadequate to the task. Wideband radar signals can be generated from series or groups of narrow-band signals centered at different frequencies. A wideband Linear FM (LFM) chirp can be assembled from lesser-bandwidth chirp segments. The chirp segments can be transmitted as separate pulses, each with their own steering phase operation. Each chirp segment's bandwidth would essentially be narrow-band by itself. Doing so allows each pulse to be steered by phase shifters alone. This overcomes the problematic dilemma of steering wideband chirps with phase shifters alone. True time-delay elements are not required. The raw Phase History data can then be processed in a manner to reconstruct the image by combining all pulses with all chirp segments. In this manner the image will exhibit resolution consistent with the entire resolution bandwidth, which can be much larger than any individual segment's chirp bandwidth.

Citation Download Citation

A. W. Doerry "Wideband SAR processing with segmented chirps for phased-array radars", Proc. SPIE 6547, Radar Sensor Technology XI, 654702 (2 May 2007); https://doi.org/10.1117/12.717801

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