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A cold-start visible star search method for multi-constellation receivers

A search method and receiver technology, applied in the field of satellite navigation, can solve the problem of long time-consuming cold start, and achieve the effect of stabilizing cold start and reducing the time-consuming of cold start

Active Publication Date: 2020-03-24
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a multi-constellation receiver cold-start visible star search method, which overcomes the problem that the multi-constellation receiver cold start takes too long

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  • A cold-start visible star search method for multi-constellation receivers
  • A cold-start visible star search method for multi-constellation receivers
  • A cold-start visible star search method for multi-constellation receivers

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Embodiment Construction

[0021] Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0022] The overall flow chart of this method is as follows figure 1 As shown, the time and almanac are known, and the distribution of satellites is obtained. In the first stage, the initial satellite group is constructed and searched. In the second stage, the marginal satellite group is constructed and searched. In the third stage, the extension and indentation are searched. In the fourth stage, the remaining satellites are searched. Finally complete the cold start. The following work needs to be done:

[0023] 1. Eliminate theoretically invisible satellites

[0024] Suppose a certain visible star is SV1, and another satellite to be tested is SV2, and the instantaneou...

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Abstract

The invention discloses a multi-constellation receiver cold start visible satellite searching method. The multi-constellation receiver cold start visible satellite searching method comprises steps that legitimate inference is carried out according to acquired captured visible satellites, and theoretically invisible satellites are eliminated, and therefore a searching range of residual satellites is reduced; four steps adopting different searching orders are designed: a first step of searching an initial satellite group, a second step of searching an edge satellite group, a third step of extending and shrinking the searching, a fourth step of searching the residual satellites. The minimal range of the residual satellites is determined quickly and reasonably, and under conditions with or without shielding, cold start time consumption is effectively reduced.

Description

technical field [0001] The invention relates to a multi-constellation receiver cold-start visible star search method, which belongs to the technical field of satellite navigation. Background technique [0002] Multi-constellation combination positioning is the comprehensive use of satellites of different constellations to help users achieve positioning. GPS in the United States, GLONASS in Russia, GALIEO in the European Union, and Beidou in China can all provide effective observation information. Compared with the traditional single-constellation positioning, multi-constellation combination positioning doubles the observation information, which greatly improves the availability, reliability and accuracy of positioning services. [0003] During the cold start process, the receiver needs to complete a three-dimensional search process, and the three-dimensional uncertainties are visible stars, Doppler frequency shift and code phase. For the two-dimensional search process of Do...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/28
CPCG01S19/28
Inventor 金春杨范胜林
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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