针对特定辐射源识别的高精度符号同步方法

doi:10.11959/j.issn.1000-436x.2018132

Abstract

Abstract:

The existing symbol timing algorithms have the problems that the method of delay estimation is improper and the calculation precision of the interpolation is insufficient for the pretreatment of specific emitter identification.A high-precision symbol timing algorithm was proposed to solve these problems.Aiming at the former problem,a two-step estimation method was adopted,rough estimation of delay was firstly obtained by the forward algorithm,and then the accurate value was acquired through local search with the demodulated symbols.For the latter problem,a window-based approach was used to design an interpolating filter which could optimize the anti-aliasing characteristics and improve the calculation accuracy.Simulation results show that the proposed algorithm can effectively solve the above problems and achieve better recognition results in the radiation source recognition compared with the conventional symbol timing algorithm.

Key words: specific emitter identification, high precision, symbol timing, delay estimation, interpolating filter

CLC Number:

TN911.7

Yiwei PAN,Hua PENG,Tianyun LI,Wenya WANG. High-precision symbol timing algorithm for specific emitter identification[J]. Journal on Communications, 2018, 39(8): 106-112.

Figures/Tables 10

References 14

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参数	1	2	3	4	5
ε	0.003 1	0.013 9	0.025 0	0.035 8	0.048 5
?	0.000 2	0.020 6	0.042 4	0.064 6	0.086 4
I₀	0.000 3	0.012 8	0.025 0	0.028 2	0.042 4
Q₀	0.000 2	0.012 7	0.025 3	0.027 9	0.041 1

类别	识别为该类别的数目			正确率	识别率
类别	1	2	3	正确率	识别率
1	137	13	0	91.3%
2	12	138	0	92.0%	94.4%
3	0	0	150	100.0%

类别	识别为该类别的数目			正确率	识别率
类别	1	2	3	正确率	识别率
1	144	6	0	96.0%
2	8	142	0	94.7%	96.9%
3	0	0	150	100.0%

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High-precision symbol timing algorithm for specific emitter identification

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