时宽-波形基联合捷变的LPD通信波形

doi:10.3969/j.issn.1001-506X.2020.12.26

摘要/Abstract

摘要：

为了提升通信信号的低检测概率(low probability of detection, LPD)性能,从降低通信波形各域能量聚敛性的角度,提出时宽-波形基联合捷变(joint agility of time width and waveform bases, JATW)的波形构架。基于此构架,以切普扩频(chirp spread spectrum, CSS)和正弦扩频(sinusoidal frequency spread spectrum, SFSS)为波形基,采用变时宽(varied of time width, VTW)参数配置方法,提出基于VTW-CSS/SFSS混合波形的LPD通信波形。采用数学推导辅以数值仿真分析的方法,分析所提出波形的各域能量聚敛特征。理论分析和数值仿真结果表明,相较于CSS和SFSS,所提波形的各域能量聚敛性明显较弱, JATW的波形构架有助于提升通信波形的LPD性能。

关键词: 低检测概率, 波形时宽-波形基联合捷变, 变时宽, 切普扩频, 正弦扩频, 能量聚敛特征

Abstract:

In order to improve the performance of the low probability of detection (LPD) for the communication signal, the waveform framework based on joint agility of time width and waveform bases (JATW) is proposed from the perspective of reducing energy convergent characteristic (ECC) in various transform domains. Based on this framework, the chirp spread spectrum (CSS) and sinusoidal frequency spread spectrum (SFSS) are adopted as waveform bases, and a mixed LPD waveform based on VTW-CSS/SFSS is proposed using the parameter configuration method with the varied time width (VTM). Mathematical deduction and numerical simulation demonstrate the ECC of the proposed waveform over various transform domains. Theoretical analysis and numerical simulation results show that the proposed waveform reduces the ECC over various transform domains, compared with the CSS and the SFSS, the wareform framework based on JATW benefits the improvement of LPD feature for the communication waveform.

Key words: low probability of detection (LPD), joint agility of time width and waveform base (JATW), varied of time width (VTW), chirp spread spectrum (CSS), sinusoidal frequency spread spectrum (SFSS), energy convergence characteristic (ECC)

中图分类号:

TN911.6

张晓彤, 李书凯, 孙志国, 谢红. 时宽-波形基联合捷变的LPD通信波形[J]. 系统工程与电子技术, 2020, 42(12): 2884-2891.

Xiaotong ZHANG, Shukai LI, Zhiguo SUN, Hong XIE. LPD communication waveform of joint time width waveform agility[J]. Systems Engineering and Electronics, 2020, 42(12): 2884-2891.

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波形子集	m^VTW-CSS(t)	m^VTW-SFSS(t)
时宽序号i	m_{i, b}^VTW-CSS(t)	m_{i, b}^VTW-SFSS(t)
波形时宽控制字C_j^T	C_j^T=i－1	C_j^Wj=1
波形基控制字C_j^W	C_j^W=1	$\overline {C_j^W} =1$
波形时宽	T_i	T_i
扫频带宽	B	B
时宽带宽积	D_i=BT_i	D_i=BT_i

D_i取值	波形
D_i取值	CSS	SFSS	CSS/SFSS	DSSS/BPSK
50	0.197 3	0.193 7	0.174 1	0.363 4
100	0.163 5	0.162 0	0.144 8	0.361 2
150	0.146 7	0.149 6	0.132 7	0.360 1
200	0.134 6	0.138 0	0.122 2	0.359 9

波形参数	波形
波形参数	CSS	VTW-CSS	VTW-CSS/SFSS
波形时宽/s	1.00	0.90、1.10	0.9、1.10
曲线标准方差(精度为10^-4)	0.864 1	0.073 4	0.037 7