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GNSS carrier phase smoothness pseudo-range processing method

A technology of carrier phase and processing method, which is applied in the field of global satellite navigation system, can solve the problem of large error of carrier phase smoothing pseudo-range, achieve the effect of compressing coarse code pseudo-range error, improving the accuracy of smoothing pseudo-range, and improving positioning accuracy

Active Publication Date: 2014-05-14
NO 63921 UNIT OF PLA
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

These two ways of setting M are non-objective means, so there is a large error in the carrier phase smoothing pseudorange obtained by the traditional carrier phase smoothing method

Method used

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  • GNSS carrier phase smoothness pseudo-range processing method
  • GNSS carrier phase smoothness pseudo-range processing method
  • GNSS carrier phase smoothness pseudo-range processing method

Examples

Experimental program
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example 1

[0121] Example 1: When the receiver output frequency is 1Hz, 10Hz and 20Hz, the smoothing constant M calculated by the method of the present invention is best Equipment measurement error σ with GNSS coarse code pseudo-range DLL The change curve is as figure 2 As shown, the divergent change rate I of the ionospheric delay in the figure d , the upper bound of the typical value of ionospheric divergence change rate in mid-latitude regions is 0.1m / min. figure 2 It shows that with the equipment measurement error σ of the GNSS coarse code pseudo-range DLL Different from the output frequency of the receiver, the smoothing constant will also have a large change. It is not appropriate to specify the smoothing constant arbitrarily or force the smoothing constant to an equivalent value of 100s.

example 2

[0122] Example 2: Carrier phase smoothing comparison of 14000 epoch observation data of a GPS receiver.

[0123] (1) The known parameters of the data are: the satellite number is 11, and the sampling period is T m =0.25s, the DLL tracking error of the coarse code pseudo-range is , I d The upper bound of the typical value of the ionospheric divergence velocity in the mid-latitude region is 0.1m / min.

[0124] (2) Select the comparison object: select three smoothing constants as the comparison object:

[0125] (a) the smoothing constant obtained by the calculation method of the present invention is

[0126]

[0127] (b) The 100s equivalent smoothing constant is

[0128] m 100s =100 / 0.25=400

[0129] (c) An artificially specified smoothing constant, specifying that the smoothing constant value is 10 times the smoothing constant, that is, M 710 =710

[0130] (3) Comparison purpose: To compare the variation of the smoothing error with time after the carrier phase is smoo...

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Abstract

The invention belongs to the technical field of a GNSS, and discloses a GNSS carrier phase smoothness pseudo-range processing method. By means of calculating of a smoothing constant, a carrier phase of a current epoch, a coarse code pseudo-range and a carrier phase of the next epoch and a next epoch extrapolation pseudo-range obtained through a carrier phase smoothing pseudo-range initial value, a carrier phase smoothing pseudo-range value of the next epoch is calculated. The preceding processes are repeated, a carrier phase smoothing pseudo-range value of the GNSS is obtained in real time. Carrier phase smoothing pseudo-range precision is improved, and accordingly positioning precision of the GNSS is greatly improved.

Description

technical field [0001] The invention relates to the technical field of Global Navigation Satellite System (GNSS), in particular to a method for processing pseudo-range smoothing of GNSS carrier phase. Background technique [0002] The GNSS positioning principle of the global satellite navigation system is: the distance observation from the satellite to the receiver obtained by the receiver observation is used, and the position of the receiver is calculated by the geometric intersection method according to the known satellite position. The distance observations publicly provided by GNSS for civilian users are coarse code pseudoranges. [0003] The coarse code pseudo-range error of GNSS is relatively large, and the coarse code pseudo-range measurement error output by the GNSS receiver can reach about 1m to 3m when multipath is included. In contrast, the random error of GNSS carrier phase is only millimeter level, even including the multipath effect, the random measurement err...

Claims

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Application Information

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IPC IPC(8): G01S19/37
CPCG01S19/37G01S19/41
Inventor 刘广军罗海英郭晶李强刘旭东齐巍
Owner NO 63921 UNIT OF PLA
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