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GPS/CAPS dual mode software receiver based on PC machine

A technology of software receiver and PC, which is applied in the field of satellite navigation, can solve the problems of unopened GPS precision codes, and achieve the effects of reducing R&D costs, shortening R&D cycles, and high reliability

Active Publication Date: 2009-06-17
NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI
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Problems solved by technology

GPS is the global positioning system of the United States, with a large number of satellites, reasonable distribution and wide coverage, so at least 4 satellites can be observed at any place on the earth at the same time, so as to ensure global coverage, all-weather, and continuous implementation of three-dimensional positioning , but GPS is the positioning system of the United States, and we will be restricted in many ways when using it. For example, the precise code of GPS is not open, and it is restricted or closed to us during wartime

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  • GPS/CAPS dual mode software receiver based on PC machine

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Embodiment Construction

[0015] The PC-based GPS / CAPS dual-mode software receiver of the present invention is completely based on the PC platform under the software receiver framework, uses the acquisition card to collect GPS and CAPS intermediate frequency signals, stores the data to the computer hard disk, and then utilizes the convenient software platform , complete the data processing, realize the capture, tracking, data demodulation, satellite selection, pseudo-range extraction and PVT calculation of GPS data, complete the positioning and speed measurement calculation, and replace the function of a hardware receiver.

[0016] 1) GPS / CAPS dual-mode antenna module

[0017] The module consists of 2 independent channels of C-band and L-band. They are respectively processed by a low noise amplifier and a band-pass filter, and output to the radio frequency module.

[0018] 2) RF module

[0019] After CAPS and GPS radio frequency signals are input to this module, the two signals are processed by their...

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Abstract

The invention discloses a GPS / CAPS double-mode software receiver based on a personal computer (PC) which is characterized by adopting the existing special GPS / CAPS double-mode antenna module and radio frequency module, and implementing the other modules on the common PC completely; acquiring the intermediate frequency GPS / CAPS data of the GPS / CAPS radio frequency module respectively by a double-channel synchronous data acquisition card, storing the data into the hard disk of the PC, and implementing baseband signal processing and position resolving of all the satellite navigation signals by virtue of abundant software resources of the PC. For the complicated pseudorange extraction problem in the receiver, the invention further discloses a software post-processing method which comprises the following steps: recovering delay inequality from satellite frame headers to antenna so as to establish a pseudorange extraction method by which the pseudorange can be calculated and realize double-mode position resolving. The GPS / CAPS double-mode software receiver and the software post-processing method shorten research and development period, lower cost and realize high-precision positioning by satellite constellations of two systems.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, aims at two independent satellite navigation systems of GPS and CAPS, constructs a baseband signal processing software platform completely based on a computer, and realizes the GPS / CAPS dual-mode receiver function. Compared with ordinary receivers, the PC-based GPS / CAPS dual-mode software receiver has greater flexibility, versatility, scalability and portability, and improves the user's navigation and positioning accuracy, integrity, reliability and continuity . Background technique [0002] The CAPS system is a Chinese regional navigation and positioning system independently developed by China. Its space part is composed of 6 commercial geosynchronous orbit satellites and 3-4 inclined orbit satellites. The GDOP of the constellation is mostly less than 4 in China. GPS is the global positioning system of the United States, with a large number of satellites, reasonable distribution an...

Claims

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Application Information

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IPC IPC(8): G01S5/02G01S19/33
Inventor 纪元法孙希延施浒立王晓岚庞峰宁春林
Owner NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI
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