Positioning system based on combination of beidou satellites and pseudolites

Abstract

The invention discloses a positioning system based on the combination of beidou satellites and pseudolites. The positioning system comprises a receiver and a satellite station. The output end of the satellite station is connected with a navigation information acquisition module. The output end of the receiver is connected with a dual-satellite system timing module. The dual-satellite system timing module is connected with a data processing system. The output end of an atomic clock is connected with a frequency synthesizer. The output end of the frequency synthesizer is respectively connected with a carrier signal generator and a pseudo code generator. The carrier signal generator is connected with the input end of a carrier modulator. The output end of the pseudo code generator is connected with a pseudo-code modulator. The output end of the carrier modulator is connected with a variable-frequency filter. The variable-frequency filter is connected with a matcher through a power amplifier. The satellite station includes an embedded processor and an FPGA controller. The embedded processor is connected with the FPGA controller through an asynchronous detection module. In this way, the passive positioning of the dynamic area is realized, and the positioning effect similar to that of the GPS is realized.

Description

technical field [0001] The invention relates to the technical field of positioning systems, in particular to a positioning system based on the combination of Beidou satellites and pseudolites. Background technique [0002] As a navigation satellite independently developed by my country, the double-star system is completely independent. It uses the known positions of two geosynchronous satellites and the geodetic elevation of the station to be measured for positioning. Compared with the global positioning system GPS and GLONASS, the Beidou navigation system costs Less, the accuracy of satellite orbit measurement has no significant impact on the accuracy of navigation and positioning, and is suitable for the development and use of economically underdeveloped areas, while the Beidou navigation system uses a system and technology similar to GPS, which is divided into space, ground monitoring and data processing. , and three parts of the user receiver. The significant difference b...

AI Technical Summary

Problems solved by technology

The significant difference between the Beidou navigation system and the global positioning system is the spatial distribution of satellite constellations, the pseudo-random noise code sequence and acquisition method, carrier frequency and code frequency, modulation and coding of navigation messages, and user positioning solutions are also different. , but the current dual-star system in my country still has certain limitations. The system in our country adopts an active working method, which is easy to interfere with the system, and leads to a low update rate of user positioning data, which cannot meet the needs of high-mobility users. Requirements, which limit the number of users of the system, users need to transmit signals, which is not conducive to concealment, which is especially important for military users

Since the system adopts centralized management, the system is a node system. Once the center is destroyed, the entire system will be paralyzed; at the same time, since all user positioning is completed at the central station, this requires extremely high processing capabilities for the central station equipment. , and also lead to a large lag error in the positioning data

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