Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Positioning drift detecting method and device

A technology for drift detection and positioning position, which is applied in the field of positioning and can solve problems such as reflection, phase, time change, and large difference in positioning position.

Active Publication Date: 2019-03-26
ALIBABA (CHINA) CO LTD
View PDF15 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the real environment, during the transmission process of the radio frequency signal of the satellite, it is easily affected by the atmospheric environment and blocking objects (such as tall buildings, trees, viaducts), etc., and the refraction and reflection of the radio frequency signal will occur, which will cause the radio frequency signal to reach the GNSS receiver. The phase and time of the machine change, and in severe cases, the positioning position of the terminal will drift, that is, the positioning position of the terminal is quite different from the actual position

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Positioning drift detecting method and device
  • Positioning drift detecting method and device
  • Positioning drift detecting method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0124] Embodiment 1 of the present application provides a positioning drift detection method, such as Figure 1a As shown, the methods include:

[0125] Step 101, acquire the GSV at the current moment output by the GNSS receiver.

[0126]GSV includes the elevation angle ELE and CNO (also C / No, carrier-to-noise ratio, carrier-to-noise ratio) of each visible satellite among the multiple satellites that can be observed.

[0127] Step 102, based on the elevation angles and carrier-to-noise ratios of visible satellites included in the GSV, count the number svnum1 of satellites whose elevation angles are greater than a preset elevation angle threshold and whose carrier-to-noise ratio is greater than a preset first carrier-to-noise ratio threshold.

[0128] In practical applications, if the elevation angle of a visible satellite is less than 10 degrees, it is considered that the radio frequency signal of the visible satellite is easily reflected by buildings on the ground plane. If t...

Embodiment 2

[0141] Embodiment 2 of the present application provides a positioning drift detection method, such as figure 2 As shown, the methods include:

[0142] Step 201, acquire the positioning position, velocity and heading outputted by the GNSS receiver at least two historical moments.

[0143] In this embodiment of the present application, the positioning position, velocity and heading of at least two historical moments can be obtained from the RMC output by the GNSS receiver. Wherein, the positioning position includes longitude lon0 and latitude lat0, speed is spd0, and heading is cog0.

[0144] In practical applications, the output frequency of the GNSS receiver can be flexibly set, generally set to 1Hz, that is, a string of information is output per second, and the acquisition of the RMC output by the GNSS receiver can also be performed according to the output frequency of the GNSS receiver, namely , collect and store the positioning position, speed and heading output by the G...

Embodiment 3

[0170] Implementation 3 of this application provides a positioning drift detection method, such as image 3 As shown, the methods include:

[0171] Step 301 , based on the identifiers of the satellites participating in the current positioning included in the GSA information, the current carrier-to-noise ratio of the satellites participating in the positioning at the current moment is obtained from the GSV.

[0172] Step 302, acquiring the historical carrier-to-noise ratio of the satellites participating in the positioning at the current moment at the previous moment.

[0173] Step 303, obtaining the difference between the current carrier-to-noise ratio and the historical carrier-to-noise ratio of the satellites participating in the positioning at the current moment.

[0174] Step 304, counting the number svnum3 of satellites whose difference is greater than the preset change threshold of carrier-to-noise ratio.

[0175] The preset change threshold of the carrier-to-noise rat...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a positioning drift detecting method and device. The method comprises the following steps of acquiring the GSV of current time output by a GNSS receiver; based on the elevationangle and the carrier-to-noise ratio of a visible satellite included in the GSV, calculating the number svnum1 of satellites whose elevation angle is greater than a preset elevation angle threshold and the carrier-to-noise ratio is greater than a preset first carrier-to-noise ratio threshold; and determining whether the svnum1 is less than a preset satellite number threshold, and if the svnum1 isless than the threshold, determine that positioning drift is generated at the current time. In the invention, through calculating the number svnum1 of the satellites whose elevation angle is greater than the preset elevation angle threshold and the carrier-to-noise ratio is greater than the preset first carrier-to-noise ratio threshold, when the svnum1 is determined to be less than the preset satellite number threshold, the number of satellites with good satellite signals participating in current positioning calculation is too small, at this time, a positioning position calculated according tothe satellite signal may be drifted, and, in the invention, positioning drift is determined to be generated at the current moment, and the accuracy of the positioning drift detection is ensured.

Description

technical field [0001] The present application relates to the technical field of positioning, and in particular to a method and device for detecting positioning drift. Background technique [0002] The principle of positioning technology based on GNSS (Global Navigation Satellite System) is: based on the distance between multiple satellites and GNSS receivers with known distribution, the terminal (such as mobile phone, vehicle-mounted terminal) including the GNSS receiver to locate. [0003] In the real environment, during the transmission process of the radio frequency signal of the satellite, it is easily affected by the atmospheric environment and blocking objects (such as tall buildings, trees, viaducts), etc., and the refraction and reflection of the radio frequency signal will occur, which will cause the radio frequency signal to reach the GNSS receiver. The phase and time of the terminal change, and in severe cases, the positioning position of the terminal will drift...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01S19/40
CPCG01S19/40
Inventor 詹俊妮张涛李鹏飞
Owner ALIBABA (CHINA) CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com