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Ambiguity calculating method used under medium-long baseline of Beidou system

A medium and long base, ambiguity technology, applied in the field of satellite navigation and positioning, it can solve the problems of poor spatial correlation of ionospheric errors, long time required for ambiguity resolution, and large ionospheric residual errors.

Active Publication Date: 2015-07-01
ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

However, for the Beidou system, if only RNSS tri-frequency measurement values ​​are used, the wide-lane measurement values ​​under the medium-long baseline are greatly affected by ionospheric errors and noise, resulting in a low success rate of ambiguity resolution
[0003] Therefore, for the ambiguit

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[0050] The traditional Beidou system ambiguity resolution method only uses RNSS signals, and does not process GEO satellites and non-GEO satellites separately. When the ambiguity is resolved under a medium-long baseline, due to the large impact of ionospheric errors, the traditional method for ambiguity resolution requires a long time and the success rate is not high.

[0051] Beidou system provides two services, RDSS and RNSS. RNSS transmits signals on three frequencies, and its signal frequencies are concentrated in 1,561.089MHz (B1), 1,207.14Mhz (B2) and 1,268.52MHz (B3). RDSS provides additional usable frequency signals for the Beidou system. The frequency provided from the satellite to the user segment is the S-band, focusing on 2491.75MHz, but the RDSS service only occurs on GEO satellites. That is, the user can receive signals on the three frequency points B1, B2, and B3 sent by non-GEO satellites, and can receive signals on the four frequency points B1, B2, B3, and S sen...

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Abstract

The invention provides an ambiguity calculating method used under a medium-long baseline of a Beidou system. The ambiguity calculating method used under the medium-long baseline of the Beidou system comprises the following steps of (1) performing signal frequency combined screening by using RNSS (radio navigation satellite service) signals and S frequency signals of RDSS (radio determination satellite service) to obtain an ultra-wide-lane, wide-lane and narrow-lane combined coefficient of a GEO (geosynchronous orbit) satellite and an ultra-wide-lane and narrow-lane combined coefficient of a non-GEO satellite; (2) performing ultra-wide-lane ambiguity calculation on the GEO satellite and the non-GEO satellite; (3) performing wide-lane ambiguity calculation on the GEO satellite; (4) performing a narrow-lane ambiguity calculation on the GEO satellite; and (5) solving narrow-lane ambiguity of the non-GEO. By the ambiguity calculating method, Beidou RNSS signals and Beidou RDSS signals are combined together, several groups of ultra-wide-lane, wide-lane and narrow-lane combinations with high performance are found out, the narrow-lane ambiguity of the GEO satellite is solved by a step-by-step computing mode through the combinations, influences of errors of an ionized layer are eliminated, the ambiguity solving time is prolonged, and the ambiguity solving success rate is improved.

Description

Technical field [0001] The invention belongs to the technical field of satellite navigation and positioning, and particularly relates to a method for ambiguity resolution under a mid-length baseline of the Beidou system. Background technique [0002] The whole-week ambiguity resolution is a key issue for high-precision positioning of satellite navigation. The most widely used method in the field of whole-week ambiguity resolution is the LAMBDA method, which has a relatively complete theoretical system and has been widely used. However, due to the influence of ionospheric errors, the performance of directly using the LAMBDA method to resolve ambiguities under medium and long baselines is not good. Another typical method of whole-week ambiguity resolution is multi-frequency ambiguity resolution. Satellite navigation systems such as GPS and Beidou provide three or more frequency measurement values. Combining these measurement values ​​with frequency can form some linear combinatio...

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Application Information

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IPC IPC(8): G01S19/44
CPCG01S19/44
Inventor 赵姣姣袁洪曲江华李子申周凯袁超唐阳阳李雯
Owner ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
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