基于HAF的混叠多分量LFM信号时域参数测量

doi:10.16180/j.cnki.issn1007-7820.2021.04.002

Abstract

Abstract:

In view of the problem that the aliasing pulse radar signal parameter measurement method based on HAF could not effectively measure the signal time-domain parameters, this study proposes a time-domain parameter measurement method of aliasing multi-component LFM signal based on HAF. The proposed method uses the phase coefficient estimates obtained by the HAF method to convert each LFM signal component into a single frequency signal component with the same time domain parameters. The single frequency signal component is separated by filtering and a suitable threshold is selected to measure the time domain parameters, so as to realize the time domain parameter measurement of each component of the aliased LFM signal. The experimental results show that this method can effectively measure the time-domain parameters of the signals, and then combined with the results of HAF method, the parameters of the LFM signal can be measured completely. The proposed method has low computational complexity and high accuracy of measurement results, and the measurement error is less than 1% when the signal-to-noise ratio is 3 dB.

Key words: signal detection, radar signal, aliasing, multi-component, linear frequency modulation, polynomial phase signal, high-order ambiguity function, parameter estimation

CLC Number:

TN971. +1

WU Zhenyu,XIA Houpei. Time Domain Parameter Measurement of Aliased Multi-Component LFM Signals Based on HAF[J].Electronic Science and Technology, 2021, 34(4): 6-11.

Figures/Tables 10

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References 16

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信号序号	脉冲到达时间/μs	脉冲宽度 /μs	起始频率 /MHz	带宽 /MHz
1	20	150	10	50
2	40	40	15	30
3	100	20	70	10
4	150	40	50	40

信号序号	一阶相位系数				二阶相位系数
信号序号	实际值 /×10⁶	测量值 /×10⁶		相对误差	实际值 /×10¹²	测量值 /×10¹²	相对误差
1	62.83	63.31	0.76%	1.05	1.04	0.95%
2	94.25	93.68	0.60%	2.36	2.35	0.42%
3	439.82	443.22	0.41%	1.57	1.56	0.64%
4	314.16	316.89	0.87%	3.14	3.13	0.32%

信号序号	脉冲到达时间		脉冲宽度		起始频率		带宽
信号序号	测量值/μs	相对误差/%	测量值/μs	相对误差/%	测量值/MHz	相对误差/%	测量值/MHz	相对误差/%
1	20.17	0.85	150.125	0.08	10.08	0.76	49.84	0.32
2	40.15	0.37	40.180	0.45	14.91	0.60	30.06	0.18
3	100.14	0.14	20.140	0.70	70.54	0.41	10.03	0.30
4	150.14	0.09	40.200	0.49	50.44	0.87	40.11	0.29

Time Domain Parameter Measurement of Aliased Multi-Component LFM Signals Based on HAF

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