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An Improved Method of Beidou Navigation Receiver Pseudorange Measurement Based on FPGA and DSP

A Beidou navigation and pseudo-range measurement technology, applied in the field of satellite navigation, can solve problems such as different subframe periods and pseudo-range value jumps, and achieve the effects of avoiding jumps, evaluating effectiveness, and improving positioning effects

Inactive Publication Date: 2018-02-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0005] The present invention proposes a Beidou navigation receiver pseudo-range based on FPGA and DSP in order to overcome the problem that the pseudo-range value suddenly jumps in the positioning process caused by timing adjustment due to the different sub-frame periods of non-GEO satellites and GEO satellites. Measurement Improvement Method Applicable to Satellite Navigation Positioning Neighborhoods

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  • An Improved Method of Beidou Navigation Receiver Pseudorange Measurement Based on FPGA and DSP
  • An Improved Method of Beidou Navigation Receiver Pseudorange Measurement Based on FPGA and DSP
  • An Improved Method of Beidou Navigation Receiver Pseudorange Measurement Based on FPGA and DSP

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Embodiment Construction

[0023] The invention will be further described in detail below in conjunction with the drawings.

[0024] The foundation of the present invention is the FPGA and DSP hardware platform owned by the deep combination research group of the Navigation Research Center of Nanjing University of Aeronautics and Astronautics, and a complete set of Beidou receiver program compiled by the research group. In order for Beidou's non-GEO satellites and GEO satellites to participate in the positioning calculation at the same time, it is necessary to solve the problem that the sub-frame period of non-GEO satellites is 6 seconds, and the sub-frame period of GEO satellites is 0.6 seconds. As mentioned in the background art, the original method is to use FPGA to count the propagation time of the two types of satellite signals. Through the objective logical relationship between the two propagation times, the timing of the two types of satellite signals is adjusted accordingly, so as to achieve Beidou's...

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Abstract

The invention discloses an improved pseudo range measuring method of a Beidou navigation receiver based on an FPGA and a DSP. Subframe headers of a Beidou non GEO satellite of the navigation text subframe period of 6s and a Beidou GEO satellite of the subframe period of 0.6s are detected to square wave responses of the periods of 0.2s respectively; the FPGA is used for counting to obtain pseudo time in which satellite navigation signals are spread in space; and the DSP reads the pseudo time and then calculates a pseudo range value to realize positioning. The method can be used to effectively prevent the pseudo distance from suddenly hopping in the positioning process after that the subframe period of the Beidou GEO satellite is inconsistent with that of the non GEO satellite or the time sequence is corrected; and thus, a Beidou satellite navigation system can be utilized more effectively, and a more accurate and stable navigation effect is realized.

Description

Technical field [0001] The invention relates to an improved method for pseudorange measurement of a Beidou navigation receiver based on FPGA (field programmable gate array) and DSP (digital signal processor), and belongs to the technical field of satellite navigation. Background technique [0002] As we all know, the global satellite navigation system is a very important space information infrastructure. Satellite navigation systems can not only be used in the military, disaster reduction and relief, and public security fields, but also gradually play a huge role in many civilian fields such as personal navigation, traffic management, telecommunications, and fishery. In satellite navigation technology, the stability of the receiver's pseudorange solution has a vital influence on continuous good positioning. [0003] The existing Beidou navigation receiver, in order to realize the simultaneous use of GEO satellites (geostationary orbit satellites) and non-GEO satellites for positio...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/37
CPCG01S19/37
Inventor 王昕洋范胜林沈飞李荣冰朱龙泉尚斌斌韩志凤
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS