方位向调制干扰对高分宽幅多通道SAR的影响

doi:10.12305/j.issn.1001-506X.2024.06.12

Abstract

Abstract:

Multi-channel synthetic aperture radar (SAR) can use azimuthal multi-channel reconstruction processing to resolve the Doppler ambiguities, and obtain high-resolution wide-swath SAR images. Aiming at the special multi-channel reconstruction processing way, the influence of traditional SAR azimuth-modulation jamming on high-resolution wide-swath multi-channel SAR is studied, including Doppler-modulation jamming and pulse-delay-modulation forwarding jamming, to provide a theoretical basis for high-resolution wide-swath multi-channel SAR jamming decision. The theoretical analysis indicates that the Doppler-modulation jamming signal will generate equally-spaced spurious targets in the azimuth after imaging processing, and the amplitudes of the false targets are controlled by the combined sinusoidal function and matched filter loss associated with the Doppler modulation frequency. While the pulse-delay-modulation signal will only generate a jamming target after imaging, the position of the target is only related to the number of delayed pulses. The simulation experi-ments verify the correctness of the theoretical analysis.

Key words: synthetic aperture radar (SAR), high-resolution wide-swath, Doppler-modulation jamming, pulse-delay-modulation jamming

CLC Number:

TN95

Shiqi XING, Penghui JI, Dahai DAI, Dejun FENG. Influence of azimuth-modulation jamming on high-resolution wide-swath multi-channel SAR[J]. Systems Engineering and Electronics, 2024, 46(6): 1946-1956.

Figures/Tables 10

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参数	数值
载频/GHz	10
平台速度/(m/s)	300
频率间隔/MHz	2.5
采样频率/MHz	200
PRF/Hz	150
成像中心斜距/km	10
发射通道间隔/m	1.6
接收通道间隔/m	0.8
波束宽度/(°)	1
方位重构频率/Hz	600

调制频率/Hz	假目标	归一化峰值		相对峰值		方位位置/m
调制频率/Hz	假目标	理论值	估计值	理论值	估计值	理论值	估计值
30	1	0.091 7	0.027 2	0.081 8	0.024 7	－135.0	－135.5
	2	0.224 1	0.195 0	0.200 0	0.176 0	－60.0	－60.0
	3	1.000 0	1.000 0	0.892 4	0.906 1	15.0	15.0
	4	0.142 5	0.090 0	0.127 1	0.082 0	90.0	90.0
220	1	0.268 0	0.117 6	0.164 2	0.074 9	－115.0	－115.0
	2	0.864 5	0.834 7	0.529 8	0.531 9	－40.0	－40.0
	3	1.000 0	1.000 0	0.612 8	0.637 3	35.0	35.0
	4	0.281 3	0.142 5	0.172 4	0.090 8	110.0	110.0

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Influence of azimuth-modulation jamming on high-resolution wide-swath multi-channel SAR

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