SAR impulse response with residual chirps.

Doerry, Armin Walter

Sandia National Laboratories

关键词: Impulse.-Measurement;    Amplitudes;    Wave Forms;    Frequency Modulation Synthetic Aperture Radar.;    Response Functions;   

DOI  :  10.2172/959092
RP-ID  :  SAND2009-2957
RP-ID  :  AC04-94AL85000
RP-ID  :  959092

美国|英语

来源: UNT Digital Library

【 摘 要 】

A Linear Frequency-Modulated (LFM) chirp is a function with unit amplitude and quadratic phase characteristic. In a focused Synthetic Aperture Radar (SAR) image, a residual chirp is undesired for targets of interest, as it coarsens the manifested resolution. However, for undesired spurious signals, a residual chirp is often advantageous because it spreads the energy and thereby diminishes its peak value. In either case, a good understanding of the effects of a residual LFM chirp on a SAR Impulse Response (IPR) is required to facilitate system analysis and design. This report presents an analysis of the effects of a residual chirp on the IPR. As reference, there is a rich body of publications on various aspects of LFM chirps. A quick search reveals a plethora of articles, going back to the early 1950s. We mention here purely as trivia one of the earlier analysis papers on this waveform by Klauder, et al.