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Multipath suppression method based on adaptive threshold and double reference translation strategy

An adaptive threshold and multipath suppression technology, applied in the field of satellite navigation and positioning, can solve problems such as unsatisfactory effect, affecting receiver positioning and navigation accuracy, and navigation services failing to meet user positioning and navigation needs.

Pending Publication Date: 2018-12-21
TAIYUAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0002] In the Global Navigation Satellite System (GNSS, Global Navigation Satellite System), the navigation service of a single galaxy can no longer meet the needs of users for positioning and navigation, and it is caused by dynamics, multipath effects caused by dense urban buildings, and complex environments such as canyons and forests. The occlusion greatly affects the accuracy of receiver positioning and navigation
Although various software- and hardware-based strategies have been developed to mitigate this error, they are still limited by various factors and the effect is not ideal

Method used

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  • Multipath suppression method based on adaptive threshold and double reference translation strategy
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  • Multipath suppression method based on adaptive threshold and double reference translation strategy

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experiment example 1

[0091] Such as figure 2 Shown is the average shift time of each GPS satellite in DOY.

[0092] For the same satellite, although the average movement time varies from day to day, the variation is very small. Also, this figure does not include the G04, G14 and G22 satellites since the G04 satellites were not available during this period. At the same time, the G14 and G22 satellites were maneuvering during this period, with an average moving time of 229.0083(s) and 176.9639(s) respectively

experiment example 2

[0094] The present invention also evaluates and analyzes the localization performance of the proposed ATDR method and compares it with the CTSR multipath suppression method.

[0095] Such as image 3 As shown, the adaptive threshold AT method is more effective in removing noise than the constant threshold CT method;

[0096] The data analysis was carried out from the positioning accuracy in the three directions of X, Y and Z, from Figure 4 We can see that this method improves the positioning accuracy from 0.15m to 0.04m in the X direction, improves the positioning accuracy from 0.17m to 0.12m in the Y direction, and improves the positioning accuracy from 0.12m to 0.12m in the Z direction. 0.14m increased to 0.09m. It is obvious that the effectiveness of the ATDR algorithm can be seen.

[0097] Experimental results show that the ATDR method proposed by the present invention can improve the three-dimensional positioning accuracy.

[0098] For the single epoch mode with 30s ...

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Abstract

The invention discloses a multipath suppression method based on an adaptive threshold and a double reference translation strategy. The method comprises the steps of: pocessingobservation data of the reference day in the static relative positioning mode to obtain the adapted DD carrier phase residual; transfering DD residual to SD residual; applying an adaptive threshold wavelet denoising method toeach SD residual sequence to establish a multipath correction model; removing a multipath error from SD observation value of the same satellite on the following second day by using a double referencetranslation strategy; obtaining the corrected SD observation value and reconstructing DD observation value to estimate the coordinate of the rover. Accurate multipath correction model is extracted from reference Day and dual reference translation strategies by using adaptive threshold wavelet denoising method to effectively reduce the multipath of the following second day. The average improvementrate of the RMS value of the single differential residual can reach 15.82% of the constant threshold method by introducing an adaptive threshold method to reduce multipath effect in static short baseline GNSS application.

Description

technical field [0001] The invention discloses a multipath suppression method based on an adaptive threshold and a double-reference translation strategy, belonging to the technical field of satellite navigation and positioning. Background technique [0002] In the Global Navigation Satellite System (GNSS, Global Navigation Satellite System), the navigation service of a single galaxy can no longer meet the needs of users for positioning and navigation, and it is caused by dynamics, multipath effects caused by dense urban buildings, and complex environments such as canyons and forests. The occlusion of the receiver greatly affects the accuracy of the receiver positioning and navigation. Although various software- and hardware-based strategies have been developed to mitigate such errors, they are still limited by various factors and have unsatisfactory effects. Contents of the invention [0003] In order to solve the deficiencies in the prior art, the present invention discl...

Claims

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Application Information

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IPC IPC(8): G01S19/22
CPCG01S19/22
Inventor 李灯熬赵菊敏王晓毓
Owner TAIYUAN UNIV OF TECH
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