高速机动目标长时间相参积累算法

doi:10.12305/j.issn.1001-506X.2023.05.12

Abstract

Abstract:

During the long-time coherent integration for high-speed maneuvering targets, the appearance of range migration and Doppler frequency migration will cause the integration gain of radar echos to deteriorate drastically and then decrease the radar's target detection performance. Aiming at the above problems, an efficient long-time coherent integration algorithm is proposed. The algorithm first performs keystone transform to eliminate range migration of the signal after pulse compression, then utilizes improved coherently integrated smoothed generalized cubic phase function (ImCISGCPF) and improved coherently integrated smoothed cubic phase function (ImCISCPF) to complete the estimation of the target's second-order and first-order acceleration, respectively. Finally, the algorithm applies De-chirp technology to eliminate the high-order Doppler phase of the target and completes the focusing of echo in the range-Doppler domain. The proposed method makes full use of the coherence of radar echo characteristics and introduces constant delay introduction mechanism, and therefore exhibits excellent anti-noise performance and parameter estimation accuracy. Simulation experiments and theoretical analysis verify the effectiveness and anti-noise robustness of the proposed algorithm.

Key words: high-speed maneuvering target detection, long-time coherent integration, parameter estimation, range migration, Doppler frequency migration

CLC Number:

TN958.2

Yuchao YANG, Ming FANG, Chenfan ZHAO, Gang FANG. Long-time coherent integration algorithm for high-speed maneuvering targets[J]. Systems Engineering and Electronics, 2023, 45(5): 1359-1370.

Figures/Tables 10

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References 25

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算法	计算复杂度	算法	计算复杂度
CPF	O(Nlog₂N)	HAF-ICPF	O(MNlog₂N)
PGCPF	O(N_PMNlog₂N)	Radon-CPF	O(N_θMNlog₂N)
ImCISGCPF	O(MNlog₂N)	ImCISCPF	O(MNlog₂N)

雷达参数名称	参数值
雷达载波频率/GHz	4
带宽/MHz	1
采样频率/MHz	5
脉冲重复频率/Hz	800
脉冲持续时间/μs	1 000
积累脉冲个数	201

目标参数名称	参数值
初始径向距离/km	50
径向速度/(m/s)	4 100
一阶加速度/(m/s²)	20
二阶加速度/(m/s³)	18

目标参数名称	目标A	目标B	目标C
初始距离r_o/km	50	49.99	50.01
速度v₀/(m/s)	4 100	4 088	4 100
一阶加速度a₂/(m/s²)	18	12	12
二阶加速度a₃/(m/s³)	10	15	10

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Long-time coherent integration algorithm for high-speed maneuvering targets

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