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| A Phase Delay Estimation Algorithm of Frequency Hopping Signal Based on Chinese Reminder Theorem |
| ZHAO Peiyan① OUYANG Xinxin①② PENG Huafeng① |
①(National Key Laboratory of Science and Technology on Blind Signal Processing, Chengdu 610041, China)
②(Electronic Engineering College, University of Electronic Science and Technology of China, Chengdu 611731, China) |
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Abstract The bandwidth of each hop in frequency hopping signal is very narrow, and the accumulating between multiple hop is difficult, thus the accuracy of time delay estimation for frequency hopping is low. To deal with the problem, the potential of “wide band hopping” of frequency hopping signal is fully exploited. A multi-frequency phase delay estimation model is established, and the problem of time delay estimation is transformed into ambiguity resolution. Then, Chinese Remainder Theorem (CRT) is used to solve the ambiguity, but in the “non-cooperation” scene the module can not be chosen easily, thus an extrapolation method for interferometric phase based on “virtual frequency” is proposed to relax the constraint of module selection. Finally, the closed-form Robust Chinese Remainder Theorem (RCRT) is used to solve the ambiguity, and the phase delay is obtained with high accuracy. Compared with the conventional algorithm, the proposed algorithm has the advantages of high precision, low computation complexity and independence on the propagation characteristics of the channel. The simulation results verify the validity and correctness of the proposed model and algorithm.
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Received: 07 June 2017
Published: 12 December 2017
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Corresponding Authors:
ZHAO Peiyan
E-mail: zhaopy_1987@163.com
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