Beidou receiver single frequency ionosphere correction selection method
An ionospheric correction and ionospheric technology, applied in radio wave measurement systems, satellite radio beacon positioning systems, instruments, etc., can solve the problem of large number of observations
Active Publication Date: 2016-08-31
湖南中电星河电子有限公司
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Problems solved by technology
At this time, although the grid correction accuracy is higher, but because there are more observations available for model correction, the PDOP performance is better, so there is a problem in the selection of ionospheric correction methods in this case
[0006] Aiming at the problem of ionospheric correction method selection, the present invention provides a single-frequency ionospheric correction selection method for Beidou receivers, which is a single-frequency ionospheric correction selection method for Beidou receivers based on PDOP (position precision factor) comparison
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[0031] The present invention will be further described in detail below in conjunction with specific embodiments and accompanying drawings.
[0032] Taking the lha1 station as an example, the method for selecting the single-frequency ionospheric correction of the Beidou receiver of the present invention will be described in detail in conjunction with the accompanying drawings.
[0033] figure 1 It is a schematic flow diagram of the principle of the technical solution of the present invention, as shown in the figure, comprising the following steps:
[0034] Step S1, set the threshold value λ to 0.846 by statistical pseudorange residual.
[0035] Step S2, set the cut-off angle of the elevation angle to 10 degrees. At the observation time of 489 weeks and 346920 seconds, the lha1 station can observe 8 Beidou satellites with an elevation angle greater than 10 degrees, and the satellite numbers are 1, 2, 3, 5, 6, 7, 9, 10, the star map is as follows figure 2 shown. At this time...
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The invention provides a Beidou receiver single frequency ionosphere correction selection method which comprises the following steps: different ionospheres can be used for correcting a pseudo range PDOP value to form an ionosphere selection inspection amount T; the ionosphere selection inspection amount T is compared with a threshold value lambda; when T is greater than or equal to lambda, grid correction is directly used for positioning; otherwise positioning operation is performed after all observation pseudo ranges are used for correcting ionosphere delay via use of a Klobuchar model method. The Beidou receiver single frequency ionosphere correction selection method can provide an ionosphere correction strategy for a Beidou single frequency receiver, and grid efficient frontier user positioning precision can be effectively improved.
Description
technical field [0001] The invention relates to the field of research and development of Beidou satellite navigation receivers, in particular to a method for ionospheric correction selection of Beidou single-frequency receivers, which can be applied to the specific research and development of various Beidou navigation receiving terminals. Background technique [0002] The ionosphere is a dispersive medium, which is located in the atmospheric region between 70 and 1000 km from the earth's surface. Multi-frequency users can eliminate the effect of ionospheric delay through multi-frequency ionospheric combination. However, single-frequency users cannot measure the ionospheric delay, and can only use some mathematical models to calculate and correct the ionospheric delay. [0003] In order to reduce the impact of ionospheric delay on single-frequency users, the GPS system uses the Klobuchar model, and the Galileo system uses the NeQuick model. The Beidou system completed the r...
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CPCG01S19/40
Inventor 刘文祥靖守让李垣陵王飞雪吴鹏黄龙牟卫华刘瀛翔徐博
Owner 湖南中电星河电子有限公司