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Method and device for performing pseudorange observation estimation by carrier smoothing

A pseudo-range observation, smoothing pseudo-technology, applied in the field of navigation, can solve the problem of large pseudo-range error, multi-path and measurement noise suppression effect.

Active Publication Date: 2012-07-11
UNICORE COMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The duration depends on the estimation of the ionospheric system error parameters. If the ionosphere is active, the ionospheric system deviation will lead to large pseudo-range errors after smoothing, and frequent reset operations will reduce the suppression effect of multipath and measurement noise.

Method used

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  • Method and device for performing pseudorange observation estimation by carrier smoothing
  • Method and device for performing pseudorange observation estimation by carrier smoothing
  • Method and device for performing pseudorange observation estimation by carrier smoothing

Examples

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Embodiment 1

[0112] Embodiment 1, a method for estimating pseudorange observations by carrier smoothing, comprising:

[0113] Obtain the pseudorange and carrier phase observations of n frequency points respectively; n is an integer greater than or equal to 2;

[0114] Perform the carrier smoothing pseudorange operation at each frequency point at the same time to obtain the smoothed pseudorange ;

[0115] The smoothed pseudoranges of multiple frequency points are formed into a measurement equation:

[0116] Z=HX+V;(33)

[0117] in:

[0118] Z = P ~ 1 P ~ 2 . . . ...

Embodiment 2

[0156] Embodiment 2. A device for estimating pseudorange observations by carrier smoothing, such as figure 1 shown, including:

[0157] The measurement module is used to obtain the pseudorange and carrier phase observations of n frequency points respectively; n is an integer greater than or equal to 2;

[0158] The smoothing module is used to perform the carrier smoothing pseudorange operation at each frequency point at the same time to obtain the smoothed pseudorange ;

[0159] The building block is used to form a measurement equation from the smoothed pseudoranges of multiple frequency points:

[0160] Z=HX+V;(33)

[0161] in:

[0162] Z = P ~ 1 P ~ 2 ...

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Abstract

The invention provides a method and a device for performing pseudorange observation estimation by carrier smoothing. The method comprises the following steps: respectively getting a pseudorange and carrier phase observation quantity of each of n frequency points, wherein n is an integer which is not less than 2; simultaneously performing carrier smoothing pseudorange operation on all the frequency points to get the pseudoranges after smoothing; enabling the pseudoranges after smoothing of the multiple frequency points to constitute a measurement equation; and performing value estimation according to the measurement equation and taking the obtained estimated value of r as the estimated value of pseudorange observation quantity. According to the method and the device, on the basis of greatly reducing multi-path and measuring noise, the influence of an ionized layer is eliminated, and the pseudorange estimation precision is further significantly improved.

Description

technical field [0001] The invention relates to the field of navigation, in particular to a method and device for estimating pseudorange observations through carrier smoothing. Background technique [0002] The speed at which waves propagate in a medium depends on the refractive index of the medium. The refractive index n is defined as the ratio of the wave velocity c in free space to the velocity v in the medium. For the electromagnetic wave emitted by GNSS (Global Navigation Satellite System, Global Navigation Satellite System), it propagates at the speed of light in free space, and the propagation speed in the ionosphere and troposphere is not equal to the speed of light. [0003] Refractive index: n=c / v (1) [0004] A medium is dispersive for a wave if the refractive index of the wave in the medium is not constant but is a function of the frequency f. For L-band electromagnetic waves, the ionosphere is a dispersive medium, and the troposphere is a non-dispersive mediu...

Claims

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Application Information

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IPC IPC(8): G01S19/07G01S19/22
Inventor 邱剑宁韩绍伟莫钧
Owner UNICORE COMM INC
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