Abstract
On the basis of realizing regional navigation, the Quasi-Zenith Satellite System (QZSS) has advanced navigation function, which leads to the broadcasting of more signals in a single frequency of QZSS signals. Current signal transmission technology cannot solve this problem, so it is necessary to design a signal multiplexing method. The current QZSS satellite interface document does not disclose the multiplexing modulation method of the signal transmission, which has a certain impact on the acquisition of high-precision observation data and further data processing. The iGMAS (International GNSS Monitoring & Assessment System) Monitoring and Evaluation Center of the 54th Research Institute of China Electronics Technology Group Corporation has used the low-distortion data acquisition and processing platform and refined signal software receiving processing algorithm of the iGMAS to complete the signal acquisition and analysis of QZSS satellites. Analysis of the multiplexing and modulation method and signal characteristics for the QZSS has been carried out, which can provide a reference for the design and data processing of high-precision receivers.
Highlights
The Quasi-Zenith Satellite System (QZSS) was first proposed by the Japan Open Committee inJune 2000
The QZSS system mainly solves the problem where the positioning services provided by the GPS system cannot meet the navigation and positioning needs of urban vehicle users in most urban canyons in Japan [2], as shown in Figure 1, by building a regional satellite navigation system with positioning, mobile communication, and broadcasting functions
In order to achieve the purpose of assisting GPS system navigation enhancement, QZSS satellite navigation signals were designed with compatibility and interoperability with GPS navigation signals at the beginning of the design
Summary
The Quasi-Zenith Satellite System (QZSS) was first proposed by the Japan Open Committee in. The QZSS system mainly solves the problem where the positioning services provided by the GPS system cannot meet the navigation and positioning needs of urban vehicle users in most urban canyons in Japan [2], as shown, by building a regional satellite navigation system with positioning, mobile communication, and broadcasting functions. It provides auxiliary enhanced functions for the GPS system and greatly improves the accuracy and availability of navigation in Japan [3]. One is the L1-SAIF(Submeterclass Augmentation with Integrity Function) signal at 1575.42 MHz. The main purpose is to provide users in Japan with wide-area differential GPS corrections and integrity information, and to be compatible with space-based augmentation systems [5].
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