Neumann-Hoffman Code Evasion and Stripping Method For BeiDou Software-defined Receiver

Affiliation of Author(s):自动化学院

Journal:JOURNAL OF NAVIGATION

Key Words:Neumann-Hoffman Code BeiDou Software-defined receiver Evasion

Abstract:The acquisition and tracking strategies of the BeiDou navigation satellite signals are affected by the modulation of Neumann-Hoffman code (NH code), which increases the complexity of receiver baseband signal processing. Based on the analysis of probability statistics of the NH code, a special sequence of incoming signals is proposed to evade the bit transitions caused by the NH code, and an NH Code Evasion and Stripping method (NCES) based on the NH-premodulated code is proposed. The NCES can be applied in both 20-bit NH code and 10-bit NH code. The fine acquisition eliminates the impact of NH code on the traditional tracking loop. These methods were verified with a BeiDou PC-based software-defined receiver using the actual sampled signals. Compared with other acquisition schemes which try to determine or ignore the NH code phase, the NCES needs fewer incoming signals and the actual runtime is greatly reduced without sacrificing much time to search in the secondary code dimension, and the success rate of acquisition is effectively improved. An extension of Fast Fourier Transform (FFT)-based parallel code-phase search acquisition gives the NCES an advantage in engineering applications.

ISSN No.:0373-4633

Translation or Not:no

Date of Publication:2017-01-01

Co-author:Meng, Qian,Zeng, Qing-hua,Feng, Shao-jun,Chen, Rui-zhi

Correspondence Author:ljy

Date of Publication:2017-01-01