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

摘要/Abstract

摘要：

脉间捷变波形的匹配滤波响应存在差异, 对地/海杂波等效为距离旁瓣调制(range sidelobe modulation, RSM), 导致杂波抑制能力下降, 甚至无法进行相参处理。针对线性调频(linear frequency modulation, LFM)信号在带宽恒定前提下, 改变脉宽和调频极性后具有主瓣宽度相同、旁瓣幅度起伏小的特点, 对其模糊函数、峰值增益损失、单通道运动目标显示(moving target indicator, MTI)处理和空-时处理性能进行分析。仿真结果表明, 在时宽-带宽积大于1 000、归一化脉宽变化小于0.4条件下, 目标积累损失小于1 dB, 脉宽滑变时单通道时域杂波抑制能力优于29 dB, 空-时杂波抑制处理在杂噪比(clutter to noise ratio, CNR)低于40 dB时损失小于1 dB。

关键词: 波形捷变, 相参处理, 距离旁瓣调制, 低截获, 抗干扰

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

中图分类号:

TN958.3

杨志伟, 谢雪新, 李舒婉. 脉宽-调频极性捷变波形相参处理能力分析[J]. 系统工程与电子技术, 2022, 44(4): 1139-1147.

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.

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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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