外辐射源雷达模糊函数的快速算法与硬件实现

doi:10.3969/j.issn.1001-506X.2020.09.10

摘要/Abstract

摘要：

外辐射源雷达作为一种新体制雷达在探测低空小目标应用中得到了广泛的关注。针对外辐射源雷达利用模糊函数探测目标时延和多普勒频移的计算量大、难以满足系统实时性要求的问题,提出一种快速计算模糊函数方法。首先，将数据进行分段;然后，对分段后数据分别进行相关运算和抽取滤波;最后，用快速傅里叶变换(fast Fourier transform, FFT)算法对数据进行处理,显著提高了模糊函数的计算效率,并在现场可编程逻辑门阵列(field programmable gate array, FPGA)上实现了该算法。实测结果表明了该算法的可行性，研究成果为外辐射源雷达系统算法硬件化提供了参考依据。

关键词: 外辐射源雷达, 模糊函数, 现场可编程逻辑门阵列, 素因子算法

Abstract:

As a new radar system, passive radar has been widely used in the application of detecting low altitude small targets. In order to solve the problem that the large amount of calculation of target time delay and Doppler frequency shift detected by passive radar using ambiguity function are difficult to meet the real-time requirements of the system, a fast calculation method of ambiguity function is proposed. Firstly, the datas are segmented. Then, the segmented datas are processed by correlation operation and decimation filtering, respectively. Finally, fast Fourier transform (FFT) algorithm is used to process the data. The calculation efficiency of ambiguity function is improved significantly, and the algorithm is implemented on field programmable gate array (FPGA). The experimental results show the feasibility of the algorithm, and the research results provide a reference for the hardware implementation of the algorithm of the passive radar system.

Key words: passive rader, ambiguity function, field programmable gate array (FPGA), prime factor algorithm (PFA)

中图分类号:

TN958.97

饶云华, 聂文洋, 周健康. 外辐射源雷达模糊函数的快速算法与硬件实现[J]. 系统工程与电子技术, 2020, 42(9): 1953-1960.

Yunhua RAO, Wenyang NIE, Jiankang ZHOU. Fast algorithm and hardware implementation of ambiguity function for passive radar[J]. Systems Engineering and Electronics, 2020, 42(9): 1953-1960.

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参数	值
信号频率/MHz	470~806
信号带宽/MHz	7.56
采样率/MHz	7.56
最大探测速度/(m/s)	100
最远探测距离/m	10 000
距离元数	256

参数	积累时间/s
参数	0.5	1	2	4
N(×10⁶)	3.78	7.56	15.12	30.24
K	70	140	280	560

参数	值
通带截止频率	0.098
阻带起始频率	0.152
通带容限误差	0.005
阻带容限误差	0.001
抽取倍数	4
滤波器阶数	49

参数	第一级抽取	第二级抽取
抽取因子	2	2
滤波器阶数	9	25
通带截止频率	0.098	0.198
阻带起始频率	0.402	0.302
通带容限误差	0.005	0.005
阻带容限误差	0.001	0.001

积累时间/s	N₂参考值	M值	素因子分解
0.5	1 008	252	4×7×9
0.6	1 024	256	-
0.7	1 260	315	5×7×9
0.8	1 440	360	5×8×9
0.9	1 680	420	3×4×5×7
1.0	1 760	440	5×8×11