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Star choosing method for satellite navigation system

A satellite navigation system and satellite technology, which is applied in the field of satellite navigation system star selection, can solve the problems of increasing the calculation amount of positioning calculation, which is unrealistic, etc., and achieve the effects of fast star selection, flexible use, and overcoming the excessive number of star selection

Active Publication Date: 2013-02-27
BEIHANG UNIV
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Problems solved by technology

Because the calculation amount of positioning solution is directly multiplied by the number of positioning satellites used, this increases the calculation amount of subsequent positioning solution, especially for high dynamic users, which is also unrealistic

Method used

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  • Star choosing method for satellite navigation system
  • Star choosing method for satellite navigation system
  • Star choosing method for satellite navigation system

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Embodiment Construction

[0052] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0053] The present invention is a satellite navigation system satellite selection method, the method flow chart is as follows figure 1 shown.

[0054] In a certain observation epoch, the receiver can observe multiple satellites in multiple combined constellations at the same time, and now it is necessary to select a specified number of satellites that meet the positioning requirements.

[0055] Step 1: Parameter configuration.

[0056] According to positioning needs, receiver performance and the number of combined constellations, configure the number of satellites to be selected n s And the geometric precision factor GDOP value limit requirements of the constellation, configure the required population size pop_size and the maximum evolution algebra G max , to determine the crossover probability p used in the crossover operation c and the mutation ...

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Abstract

The invention discloses a star choosing method for a satellite navigation system. The aims of reducing star choosing operational amount and navigational positioning calculated amount are fulfilled by choosing stars according to the set number of satellites on the premise of meeting the navigational positioning requirement. The method comprises the following steps of: setting parameters; acquiring the positions of visible stars; performing star choosing operation to form a new population by coding, initializing populations, acquiring fitness function values, selecting, crossing and variation so as to select an individual with maximal fitness function value as an initial star choosing result; and when the termination condition is met, acquiring a final star choosing result according to the individual. The method effectively solves the problem of large calculated amount of the conventional star choosing method, and has the advantages of flexible operation, simple and quick star choosing, and suitability for real-time star choosing under the static and dynamic conditions.

Description

technical field [0001] The invention belongs to the field of satellite navigation, and in particular relates to a satellite selection method for a satellite navigation system. Background technique [0002] In recent years, the role of satellite navigation system in navigation measurement has been increasing day by day. It has produced great economic and social benefits in scientific research, national economy and national defense construction, and has played an increasingly important role in all aspects of people's lives. effect. At present, the United States' Global Positioning System (Global Positioning System, referred to as GPS) and Russia's Global Navigation Satellite System (GLObal NAvigation Satellite System, referred to as GLONASS) have developed into the second-generation satellite navigation and positioning system, and the European Union's Galileo (GALILEO) The system and China's BeiDou / COMPASS Navigation Satellite System (COMPASS for short) are under active prepa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/28
Inventor 张晓林陈灿辉霍航宇
Owner BEIHANG UNIV
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