基于MIMO直达波的无人机分布式相参雷达相位同步方法

doi:10.3969/j.issn.1001-506X.2020.05.07

Abstract

Abstract:

For the distributed coherent aperture radar (DCAR), the precondition to realize fully signal coherence is phase synchronization. The factors, such as initial clock jagging, position derivation owning to maneuverability and original phase of local oscillators (LOs) belonging to unit radars, mainly result in DCAR phase non-synchronization. Aiming to solve these problems, a phase synchronization method based on multiple input multiple output (MIMO) direct path wave for unmanned aerial vehicle (UAV) DCAR is proposed. Firstly, it estimates time synchronization derivation by means of envelope synchronization combining two-way time comparison. Then the coordinate linear conversion method and the offset linear conversion method are put forward, which combine different auxiliary antennas echoes owning to the same unit radars to improve the position deviation estimation accuracy. Finally, through compensation to the direct path wave using deviation estimation values, the rest phase reflects LOs original phase estimation belonging to different pairs. The numerical examples demonstrate the validity of the theoretical results.

Key words: phase synchronization, position derivation, direct path wave, coordinate linear conversion method, offset linear conversion method

CLC Number:

TN958

Xiaoyu LIU, Tong WANG, Jianxin WU, Jinming CHEN. Phase synchronization method based on MIMO direct path wave for UAV distributed coherent aperture radar[J]. Systems Engineering and Electronics, 2020, 42(5): 1014-1025.

Figures/Tables 17

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单元雷达序号	真实	包络同步法联合双向时间比对	扩展滑窗积累法联合双向时间比对	相关检测法联合双向时间比对
1	0.00	0.00	0.00	0.00
2	40.23	40.20	41.67	39.58
3	22.40	22.38	25.00	18.75

变换方式	单元雷达序号	位置误差/m
变换方式	单元雷达序号	x维	y维	z维
真实值	1	0.000 0	0.000 0	0.000 0
	2	2.647 2	-4.430 0	9.150 1
	3	-8.049 2	0.937 6	9.297 8
偏移线性变换法	1	0.000 0	0.000 0	0.000 0
	2	2.657 7	-4.457 2	9.537 1
	3	-8.025 7	0.811 0	9.655 7
坐标线性变换法	1	0.000 0	0.000 0	0.000 0
	2	2.657 8	-4.391 7	9.379 4
	3	-8.007 3	1.076 2	9.583 8

变换方式	单元雷达序号	位置误差/m
变换方式	单元雷达序号	x维	y维	z维
真实值	1	0.000 0	0.000 0	0.000 0
	2	2.647 2	-4.430 0	9.150 1
	3	-8.049 2	0.937 6	9.297 8
偏移线性变换法	1	0.000 0	0.000 0	0.000 0
	2	2.657 7	-4.382 2	9.312 1
	3	-8.025 7	0.936 0	9.305 7
坐标线性变换法	1	0.000 0	0.000 0	0.000 0
	2	2.657 8	-4.466 7	9.304 4
	3	-8.007 3	0.926 2	9.283 8

	单元雷达序号	位置误差/m
	单元雷达序号	x维	y维	z维
真实值	1	0.000 0	0.000 0	0.000 0
	2	2.647 2	-4.430 0	9.150 1
	3	-8.049 2	0.937 6	9.297 8
跟飞	1	0.000 0	0.000 0	0.000 0
	2	2.657 7	-4.382 2	9.312 1
	3	-8.025 7	0.936 0	9.305 7
并飞	1	0.000 0	0.000 0	0.000 0
	2	2.765 5	-4.415 2	9.181 3
	3	-8.044 2	0.965 0	9.307 3
斜飞	1	0.000 0	0.000 0	0.000 0
	2	2.676 8	-4.442 7	9.110 8
	3	-7.979 2	0.888 9	9.318 0

[1]	Xiaoyu LIU, Jianxin WU, Tong WANG, Jinming CHEN. Phase synchronization error estimation based on prominent scatterers for UAV distributed coherent aperture radar [J]. Systems Engineering and Electronics, 2020, 42(4): 781-791.
[2]	DOU Gao-qi, LIU Hong-bo, GAO Jun. Iterative phase synchronization using low-density parity check codes [J]. Journal of Systems Engineering and Electronics, 2013, 35(6): 1303-1306.

Phase synchronization method based on MIMO direct path wave for UAV distributed coherent aperture radar

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