Chinese area positioning system (CAPS)/global positioning system (GPS) dual-mode receiver

Abstract

The invention provides a Chinese area positioning system (CAPS) / global positioning system (GPS) dual-mode receiver. CAPS satellite signals and GPS satellite signals are received simultaneously by a CAPS / GPS dual-model antenna, and are respectively transmitted to a CAPS radio frequency front end and a GPS receiver module through a power divider; the CAPS satellite signals are filtered and amplified through the CAPS radio frequency front end and sent to a CAPS mixer subjected to down conversion; intermediate frequency analog signals generated during frequency mixing are output to a microprocessor through an A / D conversion module to obtain a time scale and a text message of the CAPS signals; and the GPS receiver module carries out filtration and amplification on the GPS satellite signals, conversion from a radio frequency signal to an intermediate frequency signal, AD sampling of the intermediate frequency signal and extraction of the time scale and the text message. According to the CAPS / GPS dual-model receiver, timing and positioning information of a CAPS and a GPS can be analyzed and judged, the validity of output information is ensured, the navigation positioning precision of users is improved, and the completeness and the reliability of systems are enhanced.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, and is a dual-mode receiver for two independent satellite navigation systems, CAPS and GPS. Background technique [0002] China Area Navigation and Positioning System (CAPS) is a new satellite navigation system and system with independent intellectual property rights in my country. It adopts the equatorial synchronous (GEO) communication satellite in orbit as the navigation star, and accurately determines the orbit of the navigation star, which constitutes the spatial position reference of navigation; places a high-precision atomic clock at the navigation ground station to generate ranging codes and navigation messages and time information and transmit uplink, and broadcast downlink after being forwarded by the synchronous communication satellite transponder. Compared with the live broadcast satellite navigation and positioning system, CAPS has the advantages of integrated navigatio...

AI Technical Summary

Problems solved by technology

The current problem is that the positioning and timing accuracy provided by the GPS system to its own country and strategic partner countries can meet the strict military positioning and timing requirements, but it only provides civilian services to China, and it can be closed at any time in a small area

This technology makes the CAPS system must be the same as GPS in terms of modulation mode, spread spectrum code selection, etc., which limits the development of the CAPS system. The supply of chips is restricted by foreign countries; the overhead and power consumption of the software receiver on the computing platform are relatively large, and the signal sampling frequency of the fine code receiver must be at least 40MHz, which is 10 times that of the coarse code, and the conventional data processing platform incompetent

In addition, although the software receiver is convenient for software algorithm development, it cannot perform real-time processing at present.

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