基于LFM-Costas-BPSK脉内复合调制的低截获雷达波形设计

doi:10.12305/j.issn.1001-506X.2025.12.12

Abstract

Abstract:

Existing intra-pulse composite modulation waveforms have the disadvantages of relatively simple modulation methods and high autocorrelation sidelobe levels. These issues make the transmitted waveforms more susceptible to interception and result in poor detection performance for weak targets. To address the aforementioned issues, binary phase shift keying （BPSK） is introduced into the linear frequency modulation （LFM）-Costas radar waveform, designing the LFM-Costas-BPSK waveform. On the one hand, it reduces the correlation between sub-pulses, effectively suppressing autocorrelation sidelobe level. On the other hand, it increases waveform complexity, thereby reducing the probability of interception. The simulation experiments analyses the impact of key parameters on the waveform’s performance, and verifies the effectiveness of the designed LFM-Costas-BPSK waveform.

Key words: low probability of intercept, intra-pulse composite modulation, sidelobe level, linear frequency modulation （LFM）-Costas-binary phase shift keying（BPSK）

CLC Number:

TN 973

Ziming YIN, Pengcheng GUO, Jingjing WANG, Sizhe GAO. Design of low intercept radar waveform based on LFM-Costas-BPSK intra-pulse hybrid modulation[J]. Systems Engineering and Electronics, 2025, 47(12): 4101-4109.

Figures/Tables 15

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参数	取值
脉冲宽度T/μs	8
子脉冲个数（Costas编码位数）M	8
子脉冲宽度${T_{{\mathrm{sub}}}}$/μs	1
子脉冲内码元个数N	10
子脉冲内码元宽度${T_c}$/μs	0.1
子脉冲带宽${B_{{\mathrm{sub}}}}$/MHz	18
子脉冲跳频间隔$\Delta f$/MHz	3

Costas序列长度	旁瓣电平
6	−16.9605
8	−18.0148
10	−19.2251
12	−19.9159
16	−20.8499

BPSK长度	旁瓣电平均值/dB	旁瓣电平方差
10	−17.2630	2.0422
20	−18.6134	1.6156
40	−19.9161	1.4531
80	−21.5639	0.6501

目标径向速度/（m/s）	脉压损失/dB
0	0
±10	8.69×10⁻⁴
±100	4.09×10⁻²
±300	0.37
±500	1.04
±1000	4.54
±1500	12.61

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Design of low intercept radar waveform based on LFM-Costas-BPSK intra-pulse hybrid modulation

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Figures/Tables 15

References 33

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信号	循环自相关积累因子
LFM	10.9171
LFM-Costas	10.5989
LFM-Costas-BPSK	8.0132