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Star-selecting method for use in double-star satellite positioning system

A satellite positioning system and satellite system technology, which is applied in the field of star selection for a dual-constellation satellite positioning system, can solve problems such as a large amount of calculation for positioning and calculation, increase the accuracy of visible satellites, increase the calculation burden of receivers, etc., and achieve calculation The effect of reducing the amount, reducing the difficulty of hardware design, and reducing the complexity

Active Publication Date: 2007-07-11
BEIHANG UNIV
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Problems solved by technology

Since a maximum of 12 satellites of the same satellite system can be observed at the same time at a certain point on the earth, a maximum of 24 satellites can be observed at the same time when the dual-satellite system is combined and received. If all tracking is considered, the combined receiver needs 24 satellite tracking channels, in the case of dual frequency, there must be 48 satellite tracking channels, which will bring a lot of difficulties to the hardware design of the receiver, and when the amount of observation increases to a certain extent, more visible satellite bands The redundant observations from the satellite can not further improve the accuracy, but will bring a huge amount of calculation to the positioning solution and increase the calculation burden of the receiver. Therefore, it is very important to study satellite selection in the dual-constellation satellite positioning system. Practical

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  • Star-selecting method for use in double-star satellite positioning system
  • Star-selecting method for use in double-star satellite positioning system
  • Star-selecting method for use in double-star satellite positioning system

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Embodiment Construction

[0071] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0072] The flow of this algorithm is shown in Figure 2.

[0073] An embodiment of the invention is:

[0074] In a certain observation epoch, the receiver can observe satellites in constellation A and constellation B at the same time, and now it is necessary to select the optimal L satellites for positioning calculation, and the L satellites must include satellites in both constellations at the same time.

[0075] 1. The structural block diagram of the GNSS navigation receiver is shown in Figure 6, and the baseband correlator processing unit provides the pseudorange observations ρ and satellite ephemeris data of all visible stars;

[0076] 2. Obtain the current positions of all visible satellites through ephemeris calculations, and convert between different coordinate systems;

[0077] 3. Eliminate faulty satellites according to the independent perfection an...

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Abstract

The star choosing method for the dual constellation satellite positioning system mainly includes receiving ephemeris to get visible satellite locations to eliminate failure satellite if it can automatically perfect the analysis result, computing the direction cosine for each of the rest of visible satellite, computing the tilt of the rest of the visible satellite, choosing the biggest one, eliminating the satellite with tilt less than 5 degree, selecting several sets of four satellite groups using ergodic method, reselecting several satellite based on GDOP, the least GDOP value group will the final chosen satellite, repeating A-G at the next epoch, getting new satellite choosing result, which is sent to positioning resolve subsystem, repeating A-G to get new time satellite choosing result at the next epoch time.

Description

(1) Technical field [0001] The invention relates to a satellite selection method in a satellite navigation and positioning system, in particular to a satellite selection method in a dual-constellation satellite positioning system. (2) Background technology [0002] Satellite navigation can provide accurate and continuous position, speed and time information to various users and motion platforms in real time. Global Navigation Satellite System (GNSS, Global Navigation Satellite System) is the second-generation satellite navigation and positioning system, which has the characteristics of omnipotence (land, ocean, aviation and aerospace), global, all-weather, continuity and real-time. At present, the two major global satellite navigation and positioning systems that already exist in the world are the GPS system of the United States and the GLONASS system of Russia. The Galileo system of Europe and the BD2 system of China are in the design and construction stage. [0003] Since...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/02G01S5/14G01S1/02G01S19/28
Inventor 张晓林李宏伟张强常啸鸣张展苏琳琳张帅
Owner BEIHANG UNIV
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