基于FrFT-Keystone运动补偿的OFDM声纳高速微弱目标相参积累检测算法

doi:10.12305/j.issn.1001-506X.2024.04.03

Abstract

Abstract:

A coherent integration algorithm for high-speed weak targets is proposed towards orthogonal frequency division multiplexing (OFDM) signals in underwater target detection. The algorithm solves the problem of insufficient coherent integration gain, which is caused by significant phase changes caused by target maneuvering under multi pulse integration and low signal to noise ratio (SNR) in underwater environments. The proposed algorithm utilizes fractional Fourier transform (FrFT) to estimate the motion parameters of the target and compensate for it, and combines Keystone transform (KT) to achieve multi pulse coherent integration for high-speed weak targets. Through theoretical derivation and simulation experiments, the results show that the proposed algorithm can effectively compensate for the phase shift between high-speed target pulses and achieve good energy integration effect in low SNR environments.

Key words: high-speed and weak target, coherent integration, fractional Fourier transform (FrFT), Keystone transform (KT)

CLC Number:

TN911.72

Yiding GAO, Min WU, Chengpeng HAO, Zhigang SHANG. Coherent integration and detection algorithm for high-speed weak targets in OFDM sonar based on FrFT-Keystone motion compensation[J]. Systems Engineering and Electronics, 2024, 46(4): 1157-1166.

Figures/Tables 20

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系统参数	参数值
2KF声速c/(m/s)	1 500
采样点数/个	1 024
载波频率/kHz	20
载波个数/个	1 024
带宽/kHz	0.2
采样频率/kHz	0.2
脉冲重复频率/Hz	500
调制编码方式	BPSK
峰值功率/kW	30
积累脉冲个数/个	1 024

系统参数	参数值
2KF声速c/(m/s)	1 500
采样点数/个	1 024
载波频率/kHz	20
带宽/kHz	0.2
采样频率/kHz	0.2
脉冲重复频率/Hz	500
峰值功率/kW	30
积累脉冲个数/个	1 024

运动参数	目标A	目标B	目标C	目标D
初始距离/m	1 000	1 000	2 000	2 000
速度/(m/s)	-22	10	-10	10
加速度/(m/s²)	1	-2	0	0
散射强度/dB	8	2	5	0

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Coherent integration and detection algorithm for high-speed weak targets in OFDM sonar based on FrFT-Keystone motion compensation

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