高速机动目标长时间相参积累和参数估计算法研究

doi:10.12305/j.issn.1001-506X.2022.12.26

Abstract

Abstract:

Long-time coherent integration is one of the important techniques to improve radar detection performance. The range migration (RM), range curvation (RC), Doppler frequency migration (DFM) and Doppler frequency curvation (DFC) induced by the movement of high-speed maneuvering target during the long-time coherent integration would bring about serious integration signal-to-noise ratio (SNR) loss, which may furthermore cause the target detection performance of the radar sharp deterioration in the background of noise. In order to solve the problem, the paper proposes a parameterized long-time integration algorithm for high-speed maneuvering targets. The method applies keystone transform (KT) to eliminate linear RM firstly. Then coherently integrated modified cubic phase function (CIMCPF) and coherently integrated modified high-order ambiguous function (CIMHAF) methods are utilized respectively to estimate the first-order and second-order accelerations. Thanks to the use of signal coherent property, the method is still effective at low signal-to-noise ratio. Furthermore, since there is no brute-force search process, the computational complexity of the method is low. Simulation results and analysis demonstrate the excellent performance of the proposed method.

Key words: long-time coherent integration, keystone transform (KT), coherently integrated modified cubic phase function (CIMCPF), coherently integrated modified high-order ambiguous function (CIMHAF), parameter estimation

CLC Number:

TN958.2

Yuchao YANG, Ming FANG, Chenfan ZHAO, Yueqi WANG, Gang FANG. Research on long-time coherent integration and parameter estimation algorithm of high-speed maneuvering targets[J]. Systems Engineering and Electronics, 2022, 44(12): 3811-3820.

Figures/Tables 9

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References 20

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

目标参数名称	参数值
初始距离r_o/km	50
速度a₁/(m/s)	4 100
一阶加速度a₂/(m/s²)	20
二阶加速度a₃/(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a₁/(m/s)	4 090	4 100	4 100
一阶加速度a₂/(m/s²)	18	12	12
二阶加速度a₃/(m/s³)	15	15	10

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Research on long-time coherent integration and parameter estimation algorithm of high-speed maneuvering targets

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