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Three-frequency cycle slip detection and restoration method based on optimal fixed probability

A technology of cycle slip detection and fixed probability, which is applied in measuring devices, radio wave measurement systems, satellite radio beacon positioning systems, etc., can solve the problems that the advantages of tri-frequency observation data are not fully utilized.

Active Publication Date: 2019-11-12
湖南中电星河电子有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

When the traditional method selects three sets of linear combinations, it generally chooses long wavelength, low combined noise, and low ionospheric delay as the goals, but the above three conditions cannot be satisfied at the same time, so the traditional method can only give a few sets of relatively good ones. Combination, the advantages brought by the three-frequency observation data have not been fully utilized

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  • Three-frequency cycle slip detection and restoration method based on optimal fixed probability
  • Three-frequency cycle slip detection and restoration method based on optimal fixed probability
  • Three-frequency cycle slip detection and restoration method based on optimal fixed probability

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Embodiment 1

[0065] In this embodiment: the satellite navigation system is the Beidou system. For the Beidou system, the three frequencies are f 1 , f 2 , f 3 The frequency points correspond to B1, B2, B3 respectively. Using the method provided by the present invention, constructing three sets of cycle slip detection combinations of the Beidou system and corresponding three sets of cycle slip detection combination detection quantities, and recovering the respective cycle slip values ​​of the three frequency points of the Beidou system includes the following steps:

[0066] (1) Given the carrier coefficients (i, j, k) in the first group of cycle-slip detection combinations, (i, j, k) are all taken as (0, -1, 1). Use the formula (1) to construct the first group of cycle slip detection combinations:

[0067]

[0068] Among them, c is the speed of light; φ 1 ,φ 2 ,φ 3 are the carrier phases of the three frequency points in meters; ρ 1 ,ρ 2 ,ρ 3 are the pseudo-ranges of the three f...

Embodiment 2

[0093] In this embodiment: the satellite navigation system is a GPS system. For the GPS system, the three frequencies are f 1 , f 2 , f 3 The frequency points correspond to L1, L2, and L5 respectively. Using the method provided by the present invention, constructing three groups of cycle slip detection combinations of the GPS system and corresponding three groups of cycle slip detection combination detection quantities, and recovering the respective cycle slip values ​​of the three frequency points of the GPS system includes the following steps:

[0094] (1) Given the carrier coefficients (i, j, k) in the first group of cycle-slip detection combinations, (i, j, k) are all taken as (0, -1, 1). Use the formula (1) to construct the first group of cycle slip detection combinations:

[0095]

[0096] Among them, c is the speed of light; φ 1 ,φ 2 ,φ 3 are the carrier phases of the three frequency points in meters; ρ 1 ,ρ 2 ,ρ 3 are the pseudo-ranges of the three frequen...

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Abstract

The invention provides a three-frequency cycle slip detection and restoration method based on optimal fixed probability, the maximum fixed probability is treated as a target, preferably, three sets oflinear combinations are optimized, and the probability of three-frequency cycle slip detection and restoration is improved. In the existing method, three conditions of long-wave length, low combinednoise and low ionized layer delay are considered respectively, and due to the fact that the three conditions cannot be met at the same time, the existing method is mainly of optimizing a plurality ofsets of linear combinations for cycle slip detection and restoration in a qualitive way, and the cycle slip fixed probability is not high. According to the method in the invention, the three constraints do not need to be considered independently, the three constraints are converted into fixed probabilities, the maximum fixed probability is treated as the target, and linear combination optimizationis carried out, so that the three-frequency cycle slip detection and restoration probability is the maximum, and great significance is brought to fully exerting the three-frequency observation data advantage and finally improving the positioning precision.

Description

technical field [0001] The invention relates to the field of high-precision data processing of a satellite navigation system, in particular to a three-frequency cycle slip detection and repair method. Background technique [0002] The noise of carrier phase observation is two orders of magnitude smaller than that of pseudorange observation, and it has a wide range of applications in the field of high-precision data processing of satellite navigation systems. In the actual environment, due to factors such as signal occlusion and interference, the carrier phase observation value will jump throughout the entire cycle, and this phenomenon is generally called cycle slip. The occurrence of cycle slips breaks the continuity of carrier phase, and cycle slip detection and repair must be performed before carrier phase observations are applied to high-precision data processing. At present, satellite navigation systems represented by Beidou and GPS can broadcast three-frequency navigat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/37
CPCG01S19/37
Inventor 孙鹏跃王耀鼎刘文祥刘增军王飞雪楼生强李峥嵘李井源黄龙牟卫华
Owner 湖南中电星河电子有限公司
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