GNSS receiver long-time lock loss recapture rapid recovery positioning method

A fast recovery and receiver technology, applied in the field of satellite positioning, can solve the problems of unfavorable recovery positioning, loss of lock, and taking a long time

Active Publication Date: 2020-07-03
广东星舆科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Due to reasons such as occlusion or passing through a tunnel, the satellite signal receiver suddenly cannot receive the satellite signal, causing the satellite signal receiver to lose the lock on the originally locked satellite signal. When the occlusion disappears, the signal is suddenly available again. The satellite signal is recaptured through the loop, and then the satellite signal is tracked, bit synchronized, frame synchronized, and

Method used

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  • GNSS receiver long-time lock loss recapture rapid recovery positioning method
  • GNSS receiver long-time lock loss recapture rapid recovery positioning method
  • GNSS receiver long-time lock loss recapture rapid recovery positioning method

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Embodiment Construction

[0024] The exemplary embodiments will be described in detail below, and the implementations described in the provided examples represent some preferred implementations of the present invention, but not all implementations. All other embodiments that can be obtained by those skilled in the art based on the embodiments and pictures and texts in the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] In severely blocked city streets or roads with long tunnels, the satellite signal acquired by the satellite signal receiver is very unstable, and the signal may not be received for a long period of time. When the user walks out of the tunnel or leaves the severely blocked area , to recapture the satellite signal, then perform bit synchronization and frame synchronization, and then calculate and obtain the positioning coordinates. It takes a long time to get the positioning result, which is more and more incompatible with...

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Abstract

The invention relates to the technical field of satellite positioning, and discloses a GNSS receiver long-time lock loss recapture rapid recovery positioning method, which is characterized by comprising the following steps: S1, when a satellite signal receiver locks a satellite signal, storing locking state data; S2, traversing each channel of the satellite signal receiver in each traversing period, judging whether a satellite signal is unlocked or not, if so, continuing S3, and otherwise, continuing S2; S3, the satellite signal receiver carrying out lock losing counting to obtain lock losingtime, when the lock losing time is within a first threshold value, continuing the step S4, and otherwise, kicking off a lock losing channel; and S4, after recapturing the satellite signal, speculatinga frame synchronization word in combination with the locked state data, and resolving a positioning result of the satellite signal receiver by utilizing the frame synchronization word. The speculatedframe synchronization words can directly participate in positioning calculation, and the steps of bit synchronization and frame synchronization are omitted, so that the positioning result is quicklyobtained.

Description

technical field [0001] The invention relates to the technical field of satellite positioning, and discloses a method for quickly recovering positioning of a GNSS receiver after losing lock for a long time and recapturing. Background technique [0002] In the process of satellite baseband signal processing, after the receiver receives the satellite signal, it realizes the stripping of the carrier and pseudo code of the signal through the tracking loop. In order to obtain satellite ephemeris data, it is necessary to perform bit synchronization and frame synchronization processing on the IP branch of the tracking loop, find the bit start edge and frame start position from multiple signal levels, and finally extract the ephemeris information from them . [0003] Due to reasons such as occlusion or passing through a tunnel, the satellite signal receiver suddenly cannot receive the satellite signal, causing the satellite signal receiver to lose the lock on the originally locked s...

Claims

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Application Information

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IPC IPC(8): G01S19/37G01S19/30G01S19/24
CPCG01S19/37G01S19/30G01S19/243
Inventor 郝英杰杜洪伟吕韶清
Owner 广东星舆科技有限公司
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