脉宽-调频极性捷变波形相参处理能力分析

doi:10.12305/j.issn.1001-506X.2022.04.09

Abstract

Abstract:

The matched filter response of the interpulse agile waveform is different, and the ground/sea clutter is equivalent to the range sidelobe modulation (RSM), which leads to a decrease in clutter suppression ability and even incapability of coherent processing. Aiming at the characteristics of the linear frequency modulation (LFM) signal with the same main lobe width and small sidelobe amplitude fluctuation after changing the pulse width and frequency modulation polarity under the premise of constant bandwidth, the ambiguity function, peak gain loss, single-channel moving target indicator (MTI) processing performance and space-time processing performance are analyzed in this paper. The simulation results show that under the condition that the time width-bandwidth product is more than 1 000 and the normalized pulse width change is less than 0.4, the target accumulation loss is less than 1 dB, the single-channel time-domain clutter suppression capability is better than 29 dB when the pulse width is slipped, the space-time clutter suppression processing loss is less than 1 dB when the clutter to noise ratio (CNR) is lower than 40 dB.

Key words: waveform agility, coherent processing, range sidelobe modulation (RSM), low intercept, anti-interference

CLC Number:

TN958.3

Zhiwei YANG, Xuexin XIE, Shuwan LI. Analysis of coherent processing capability of pulse width-FMpolarity agile waveform[J]. Systems Engineering and Electronics, 2022, 44(4): 1139-1147.

Figures/Tables 10

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参数	值	参数	值
距离单元数	2 000	工作波长/m	0.2
脉冲重复频率/Hz	4 000	脉冲个数	50
波束中心方位角/(°)	90	脉宽/μs	100
波束中心俯仰角/(°)	49	通道个数	4
天线方位尺寸/m	1	输入CNR/dB	40
发射峰值功率/W	1 000	带宽/MHz	10
载机高度/m	6 000	采样频率/MHz	20
归一化脉宽变化量	0.5	载机速度/(m/s)	120

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Analysis of coherent processing capability of pulse width-FMpolarity agile waveform

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