SAR impulse response with residual chirps.

Doerry, Armin Walter

关键词: RADAR;    RESPONSE FUNCTIONS;    IMAGES;    AMPLITUDES;    WAVE FORMS;    FREQUENCY MODULATION Synthetic Aperture Radar.;    Impulse.-Measurement;   

DOI  :  10.2172/959092
RP-ID  :  SAND2009-2957
PID  :  OSTI ID: 959092
Others  :  TRN: US201016%%34

学科分类：工程和技术（综合）

美国|英语

来源: SciTech Connect

【 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.