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Data quality monitoring method for local enhancing system

A technology that enhances system and data quality, applied in the field of satellite navigation, can solve the problem of low accuracy in predicting satellite orbit position, achieve the effect of reducing integrity risk, meeting the requirements of data quality monitoring, and improving accuracy

Active Publication Date: 2011-01-19
中电科星河北斗技术西安有限公司
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Problems solved by technology

This method can effectively solve the problem of low accuracy in predicting the satellite orbit position in the classical method, and can detect the broadcast ephemeris without relying on the satellite broadcast signal, and can effectively shield the ephemeris and almanac broadcast by the system itself from artificial interference question

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  • Data quality monitoring method for local enhancing system

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Embodiment Construction

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0034] refer to figure 1 , the present invention comprises the following steps:

[0035] Step 1, broadcast ephemeris data integrity and validity check.

[0036] The integrity and validity of the same piece of broadcast ephemeris data of the same navigation satellite received by m reference receivers are respectively inspected. Check the data of each subframe of the navigation message containing the ephemeris data received by the computer. The inspection includes telemetry code inspection, conversion code inspection and subframe data content inspection. If there is no error in the subframe telemetry code inspection, the conversion code No. 18 If the bit is 0 and the subframe data has no code error, it is determined that the broadcast ephemeris data is complete, otherwise it is determined that the broadcast ephemeris is incomplete; then the ephemeris cyclic r...

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Abstract

The invention discloses a data quality monitoring method for a local enhancing system, which mainly solves the problem that the satellite orbit position calculation accuracy by the traditional data quality monitoring method is relatively low. The method comprises the following steps of: firstly, checking the data integrity and validity of a received broadcast ephemeris to acquire a group of accurate and valid ephemeris data; secondly, checking the consistency of the group of ephemeris data; thirdly, carrying out real-time precision ephemeris detection, new and old ephemeris detection and ephemeris-almanac detection on the broadcast ephemeris data with uniformity respectively; and finally, according to the data availability detection result, generating an available matrix and an available broadcast ephemeris group of the broadcast ephemeris. The method has the advantages of high satellite orbit position calculation accuracy and low ephemeris fault error detection probability and can effectively solve the problem of man-made interference on the broadcast ephemeris and almanac of a satellite navigation system.

Description

technical field [0001] The invention belongs to the field of satellite navigation, and relates to a local area augmentation system (LAAS) in the field of satellite navigation, in particular to a data quality monitoring method applied to the satellite navigation local area augmentation system. Background technique [0002] The satellite navigation local area augmentation system is a ground-based differential system, which broadcasts satellite differential data through ground differential stations, and users use the differential data for calculation to obtain high-precision navigation parameters, such as speed, position and time. The differential technology used in the system is to use the position information or distance information measured by multiple reference receivers and the correlation performance of other navigation information to eliminate most of the satellite clock error, ephemeris error and atmospheric delay error, which greatly improves the navigation positioning ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/08G01S19/21
Inventor 王晓旺耿永超李斌郑金华王彩霞樊小晶胡耀坤
Owner 中电科星河北斗技术西安有限公司
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