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Measured value quality monitoring method applied to local area augmentation system

A quality monitoring and enhancement system technology, applied in the field of satellite navigation, to achieve the effects of less dependence, improved accuracy, and improved precision

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

[0007] In order to solve the satellite availability monitoring problem in the local area augmentation system using satellite navigation, the present invention overcomes the deficiency of the above-mentioned background technology, provides a method for combining multiple receivers, and introduces code-carrier deviation detection into the existing In the measurement value quality monitoring method, and in the code pseudo-range detection, the threshold is weighted to accurately determine whether the satellite is available, select the available satellites to form an available satellite array, and calculate the differential correction amount to improve the measurement value. Accuracy of Quality Monitoring

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Embodiment Construction

[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0038] refer to figure 1 , the present invention comprises the following steps:

[0039] Step 1, receiver lock time monitoring.

[0040] The loss of lock of the receiver is rare and will not pose a great threat to the integrity. Generally, it only occurs when the elevation angle of the satellite is low. The implementation steps are as follows:

[0041] Firstly, the satellite measurement data are respectively received by M reference receivers;

[0042] Then, for the data of each satellite received by each reference receiver, calculate the numerical difference of the locking time before and after the time to judge whether the receiver is continuously phase locked, and calculate the k time of each satellite of each receiver The locking time of is recorded as TC(k), and the locking time of time k-1 is recorded as TC(k-1);

[0043] Finally, subtract TC(k) from...

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Abstract

The invention discloses a measured value quality monitoring method applied to a local area augmentation system in a satellite navigation system, mainly solving the problem that whether a satellite is available can not be accurately judged in current measured value quality monitoring. The detection steps are as follows: firstly monitoring the locking time of each receiver and each satellite to determine the satellite with normal locking time; secondly carrying out carrier phase acceleration, slope and phase step cycle slip detection on satellites normally locked, carrying out a code pseudo range innovative test on satellites passing cycle slip detection, then carrying out code-load deviation detection on satellites passing code pseudo range innovative test; and finally comprehensively processing the detection results of multiple receivers to obtain the available sate of each satellite. The invention solves the problem of inaccurate judgment when abnormal alarm occurs to satellites in the prior art, and can accurately judge whether a satellite is available, select out truly available satellites, and improve the accuracy of measured value quality monitoring.

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 method for monitoring the quality of measured values ​​applied to the local area augmentation system of the satellite navigation system. Background technique [0002] The US Global Positioning System (GPS) can work continuously / all-weather, and can provide users with accurate and continuous three-dimensional position, speed and time information on a global scale. However, due to the inherent characteristics of GPS itself, the simple use of GPS cannot meet the accuracy requirements required in many civil fields. This requires the establishment of an augmentation system to augment GPS. The local area augmentation system LAAS is such an augmentation system. [0003] The Local Area Augmentation System (LAAS) is a ground-based augmentation system proposed by the FAA. The ground station o...

Claims

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Application Information

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IPC IPC(8): G01S19/08G01S19/07
Inventor 王彩霞耿永超李斌郑金华王晓旺樊小晶胡耀坤
Owner 中电科星河北斗技术西安有限公司
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