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Correction method for global positioning system data based on speed constraint

A technology of speed constraints and data flow, applied in the field of data processing, can solve problems such as poor effect of numerical data

Inactive Publication Date: 2016-06-08
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these rules are generally integrity constraints, which do not work well for numeric data

Method used

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  • Correction method for global positioning system data based on speed constraint
  • Correction method for global positioning system data based on speed constraint
  • Correction method for global positioning system data based on speed constraint

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Embodiment Construction

[0038] The method for correcting GPS data based on speed constraints proposed by the present invention is characterized in that it can only be corrected based on given constraints without relying on other knowledge. The method includes the following steps:

[0039] 1) Build a speed constraint model:

[0040] Receive the GPS data stream, filter the original data of the received data stream, and extract the GPS data, so that the extracted GPS data stream is called GPS time series; let x i , x j is the longitude (or latitude, ie x i , x j belong to the same physical type) i, j is a positive integer less than the length of the time series, t i , t j read x for the corresponding position i , x j The time stamp of , set the time stamp and the corresponding position reading x i combination of i , x i >It is called observation value (that is, the GPS time series is composed of multiple observation values); then two observation valuesi , x i >, j , x j > The velocity between...

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Abstract

The invention relates to a correction method for GPS data based on the speed constraint. The method comprises the steps that a speed constraint model is constructed, and the speed constraint model is a reference for performing GPS time sequence correction, i.e. the corrected GPS time sequences meet the speed constraint model; a restoration scheme is determined; and the selected GPS time sequences are corrected online according to the determined restoration scheme. The method can aim at more variable situations. Besides, performing of GPS data restoration is enabled to be more rapid and more accurate by using the constraint conditions.

Description

technical field [0001] The invention belongs to the technical field of data processing, and relates to a method for correcting GPS, in particular to a method for correcting GPS through speed constraints. Background technique [0002] The occurrence of erroneous data in data streams is very common. During the GPS transmission process, data loss and errors may be caused by network delays, insufficient power of the device, ambient noise, etc. Extract GPS data as time series for cleaning and restoration. Many methods use the knowledge of machine learning to detect outliers and delete the detected outliers. It can be seen that these methods cannot restore the original data. Especially when there is a large amount of inaccurate data, simple deletion will lose a lot of knowledge that may be obtained from the data. [0003] At present, the restoration of time series is mainly divided into two categories. The first type utilizes smoothing processing. The smoothing process is ma...

Claims

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Application Information

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IPC IPC(8): G01S19/40
CPCG01S19/40
Inventor 宋韶旭张奥千王建民
Owner TSINGHUA UNIV
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