基于离散频率编码的PD雷达二维解模糊方法

doi:10.12305/j.issn.1001-506X.2021.07.02

Abstract

Abstract:

Aiming at the problem of range ambiguity and Doppler ambiguity in pulse Doppler radar at medium pulse repetition frequency, a method of applying orthogonal discrete frequency coding (DFC) waveforms to airborne PD radars is proposed. Based on the radar cyclically transmits a set of orthogonal DFC waveforms the orthogonality of the signal is used to separate the range ambiguity area and complete the range ambiguity resolution in the process of echo pulse compression. Through the Doppler ambiguity number traversal compensation and the comparison of the keystone coherent accumulation results, the correct Doppler ambiguity number is determined and the Doppler ambiguity resolution is completed. After Keystone processing, the coherent accumulation of the entire dwell time echo signal can be carried out to improve the detection and parameter estimation performance. At the same time, this paper considers the Doppler sensitivity of the DFC signal, and compensates the influence of inter-pulse Doppler in the process of precise matched filtering. Simulation experiments verify the effectiveness of the proposed method.

Key words: pulse Doppler radar, two-dimensional ambiguity resolution, discrete frequency coded waveform, precise matched filtering

CLC Number:

TN958.2

Xiping SUN, Jingyue LU, Lei ZHANG, Weijun ZHONG. Two-dimensional ambiguity resolution method of PD radar based on discrete frequency coding[J]. Systems Engineering and Electronics, 2021, 43(7): 1737-1747.

Figures/Tables 13

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参数	数值
载频/GHz	10
DFC编码脉冲数	5
频率码片个数	20
脉冲总带宽/MHz	20
脉冲重复频率/kHz	10
脉冲宽度/μs	20
最大不模糊距离/km	15
最大不模糊速度/(m/s)	±75

序号	编码
1	16, 5, 13, 18, 9, 12, 1, 14, 20, 6, 2, 4, 17, 8, 15, 11, 19, 7, 10, 3
2	8, 11, 20, 2, 14, 10, 12, 16, 7, 13, 5, 18, 6, 17, 3, 9, 4, 19, 1, 15
3	2, 7, 5, 9, 14, 19, 12, 15, 3, 1, 13, 16, 8, 11, 17, 6, 10, 18, 20, 4
4	13, 2, 6, 18, 14, 16, 20, 3, 1, 5, 19, 10, 15, 8, 11, 17, 9, 12, 4, 7
5	20, 3, 9, 17, 1, 4, 13, 16, 5, 18, 10, 6, 8, 12, 19, 15, 11, 14, 7, 2

模糊数	峰值
-1	37.3
0	82.7
1	150.5
2	82.5
3	37.4
4	20.1

方差	算法
方差	多脉冲重频	脉间相位编码	未多普勒补偿DFC	本文方法
距离方差	0.000 2	0.000 5	0.002 6	0.000 1
速度方差	0.592 9	-	0.237 5	0.003 7

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Two-dimensional ambiguity resolution method of PD radar based on discrete frequency coding

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