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Generalized Theory and Decoupled Evaluation Criteria for Unmatched Despreading of Modernized GNSS Signals

Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
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Sensors 2016, 16(7), 1128; https://doi.org/10.3390/s16071128
Received: 23 March 2016 / Revised: 5 June 2016 / Accepted: 12 July 2016 / Published: 20 July 2016
(This article belongs to the Section Physical Sensors)
In order to provide better navigation service for a wide range of applications, modernized global navigation satellite systems (GNSS) employs increasingly advanced and complicated techniques in modulation and multiplexing of signals. This trend correspondingly increases the complexity of signal despreading at the receiver when matched receiving is used. Considering the numerous low-end receiver who can hardly afford such receiving complexity, it is feasible to apply some receiving strategies, which uses simplified forms of local despreading signals, which is termed unmatched despreading. However, the mismatch between local signal and received signal causes performance loss in code tracking, which is necessary to be considered in the theoretical evaluation methods of signals. In this context, we generalize the theoretical signal evaluation model for unmatched receiving. Then, a series of evaluation criteria are proposed, which are decoupled from unrelated influencing factors and concentrates on the key factors related to the signal and its receiving, thus better revealing the inherent performance of signals. The proposed evaluation criteria are used to study two GNSS signals, from which constructive guidance are derived for receivers and signal designer. View Full-Text
Keywords: GNSS; signal evaluation; unmatched receiving; anti-interference; decouple GNSS; signal evaluation; unmatched receiving; anti-interference; decouple
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Zhang, J.; Yao, Z.; Lu, M. Generalized Theory and Decoupled Evaluation Criteria for Unmatched Despreading of Modernized GNSS Signals. Sensors 2016, 16, 1128.

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