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How to Determine Bit Ambiguity

A technology for determining method and ambiguity, applied in the field of navigation, can solve problems such as incorrect counting, reduced number of pseudo-range observations, and inability to locate, and achieve the effects of simplifying the estimation process, facilitating estimation, and ensuring positioning capabilities

Active Publication Date: 2022-07-26
QIANXUN SPATIAL INTELLIGENCE INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The GNSS receiver counts the entire cycle of bits incorrectly in harsh environments, that is, the output pseudo-range observations contain bit ambiguity, resulting in a reduction in the number of pseudo-range observations available to the positioning calculation module, and even leads to failure of positioning in severe cases

Method used

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  • How to Determine Bit Ambiguity

Examples

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Effect test

example 1

[0104] 1. Assume that in a certain epoch in a bad scenario, the receiver has 9 tracking channels that output pseudorange observations, that is, m=9.

[0105] 2. Obtain the satellite position and receiver position saved in the last successful positioning, and calculate the estimated value of the satellite-ground distance in the current epoch.

[0106] 3. Calculate l i Dataset L = (0.02-0.028), (0.04-0.048), (0.06-0.068), (0.08-0.088), (0-0.008), [-0.02-(-0.012)], [-0.04-(- 0.032)], [-0.06-(-0.052)], [-0.08-(-0.072)]=-0.008,-0.008,-0.008,-0.008,-0.008,-0.008,-0.008,-0.008,-0.008 . The -0.008 in the above data set is the difference in the remainder obtained by taking the remainder of 0.02.

[0107] 4. Obtain the estimated value of the receiver clock error according to the data set L

[0108] 5. The priori value of the clock error is about -0.008s, which can be obtained from the calibration formula i.e. round(q i )=0, the estimated value of the clock error No adjustment...

example 2

[0117] 1. Assume that in a certain epoch in a bad scenario, the receiver has 7 tracking channels that output pseudorange observations, that is, m=7.

[0118] 2. Obtain the satellite position and receiver position saved in the last successful positioning, and calculate the estimated value of the satellite-ground distance in the current epoch.

[0119] 3. Calculate l i Dataset L = (0-0.007), (0.02-0.027), (0.04-0.047), [-0.02-(-0.013)], [-0.04-(-0.033)], [-0.06-(-0.053) ], [-0.08-(-0.073)]=-0.007,-0.007,-0.007,-0.007,-0.007,-0.007,-0.007. The -0.007 in the above data set is the remainder difference obtained by taking the remainder of 0.02.

[0120] 4. Obtain an estimate of the clock error based on a univariate data set

[0121] 5. The prior information of the clock error is about 0.013s, which can be obtained from the verification formula i.e. round(q i )=1, the difference between the estimated value of the clock error and the prior information is not 0 but is close to a...

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Abstract

A method for determining bit ambiguity is provided, the method includes: obtaining the satellite-ground distance of the epoch of the last successful positioning; obtaining the pseudorange observation value of the current epoch; Calculate the bit ambiguity to be estimated including the receiver clock difference from the difference between the pseudorange observation value of the current epoch; obtain the receiver clock difference; The difference in receiver clock offsets calculates the bit ambiguity.

Description

technical field [0001] This specification generally relates to the technical field of navigation, and in particular, to a method for determining bit ambiguity. Background technique [0002] In harsh environments, the GNSS receiver counts the whole circle of bits incorrectly, that is, the output pseudorange observations contain bit ambiguity, which reduces the number of pseudorange observations available to the positioning solution module, and even leads to inability to locate in severe cases. SUMMARY OF THE INVENTION [0003] An embodiment of the present application discloses a method for determining bit ambiguity, including: [0004] Get the distance from the ground to the epoch of the last successful positioning; [0005] Get the pseudorange observations for the current epoch; [0006] Calculate the bit ambiguity to be estimated including the receiver clock error according to the difference between the satellite-to-ground distance of the last successful positioning epo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/44
CPCG01S19/44
Inventor 张希
Owner QIANXUN SPATIAL INTELLIGENCE INC
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