Abstract
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.
Highlights
As global navigation satellite systems (GNSS) have developed and upgraded, new civil signals are designed and employed, in order to support a wide and growing range of navigation services.For the applications including surveying, timing, vehicle navigation and consumer electronics, the level of performance demanded are different
To meet those requirements simultaneously in the modernized GNSS signal for civil use, complicated modulations and multiplexing techniques are employed, represented by Alternative BOC (AltBOC) and multiplexed BOC (MBOC). These new GNSS signals can be deconstructed with multiple components, different level of accuracy can be obtained by processing different number of components
In the Section “Signal evaluation approach under the local despreading waveform mismatch”, the theoretical performance bound of GNSS signal is obtained considering unmatched receiving
Summary
As global navigation satellite systems (GNSS) have developed and upgraded, new civil signals are designed and employed, in order to support a wide and growing range of navigation services. To solve the abovementioned problems, this paper proposes a theoretical code tracking evaluation method considering various receiving strategies, the mismatch of the code chip waveform of the local despreading signal. In the Section “Signal evaluation approach under the local despreading waveform mismatch”, the theoretical performance bound of GNSS signal is obtained considering unmatched receiving. In this model, a non-coherent early-late loop (NELP) is considered, where an early early minus minus late late power power discriminator discriminator is is used. To support various receiving strategies, the local despreading code in the model is described
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