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

Abstract

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)

CLC Number:

TN958.97

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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References 28

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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

Fast algorithm and hardware implementation of ambiguity function for passive radar

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Figures/Tables 24

References 28

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资源类型	资源使用	资源使用率/%
ALMs	44 081/251 680	18
LABs	6 513/25 168	26
M20K	374/2 131	18
DSP Block	312/1 687	18

参数	T=0.7 s	T=1 s
时钟频率/MHz	133.25	133.25
时钟周期/ns	7.50	7.50
处理周期	8 386 560	12 579 840
处理时间/s	0.062	0.094

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