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Quick positioning method of satellite navigation receiver after recapture of lost lock

A technology of satellite navigation and positioning method, which is applied in the direction of satellite radio beacon positioning system, measuring device, instrument, etc., can solve the problem of signal loss of lock, etc., and achieve the effect of fast positioning

Active Publication Date: 2015-06-03
TIANJIN 764 COMM AIRMANSHIP
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  • Claims
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AI Technical Summary

Problems solved by technology

The traditional positioning method is: re-acquisition, tracking, bit synchronization and frame synchronization after the satellite signal is out of lock, after analyzing the number of seconds in a week from the ephemeris, assemble the satellite signal launch time, and calculate the satellite position and satellite arrival time. The user pseudo-range, and then use the satellite position and pseudo-range to calculate the user's position and perform positioning. The disadvantage of this method is that during the movement of the receiver, the signal is easily blocked by bridges, tunnels, etc. and loses lock

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  • Quick positioning method of satellite navigation receiver after recapture of lost lock
  • Quick positioning method of satellite navigation receiver after recapture of lost lock

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Embodiment Construction

[0034] In order to understand the present invention more clearly, below in conjunction with accompanying drawing and embodiment describe in detail:

[0035] like figure 1 As shown, first judge whether the satellite signal tracked by this channel is out of lock, if it is out of lock, set the satellite signal out of lock flag of this channel and the time information of the out of lock, and then exit.

[0036] like figure 2 As shown, the following operations are performed on all tracking channels of the receiver every second: judge whether the satellite is tracked, whether the out-of-lock flag is set, and whether the out-of-lock time has exceeded the threshold value; if confirmed, follow this method to recapture the out-of-lock After the rapid positioning.

[0037] This method records the time when the satellite loses the lock, the number and ephemeris of the satellites participating in the positioning before the loss of the lock, the user's position speed information and the ...

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Abstract

The invention discloses a quick positioning method of a satellite navigation receiver after the recapture of a lost lock. The quick positioning method comprises the following steps: recording a satellite lock losing time, participated positioning satellite number and ephemeris before the lock losing, and user location speed information and user clock correction clock rate information before the lock losing; after recapture, calculating user rough location by utilizing user location speed information at current time, lock-losing time and before the lock losing, and calculating satellite rough location by utilizing the current time; calculating pseudo-range by utilizing the user rough location and the satellite rough location and correcting a pseudo-range value by utilizing the user clock correction and the user clock rate; solving pseudo-range ambiguity of the whole milliseconds by utilizing pseudo-range value which is provided by a code tracking loop and is less than 1 millisecond and the calculated pseudo-range value to obtain a correct pseudo-range value and the satellite signal emission time to position. Positioning can be carried out by adopting the method to track, bit synchronization and vertical synchronization are not needed, and index of positioning in a condition that the lock is lost within 60 second and the lock is recaptured in 1 second is realized, and the problem that conventional positioning method is not suitable for quickly positioning a movable object is solved.

Description

technical field [0001] The invention relates to a satellite navigation receiver passive positioning technology, in particular to a fast positioning method after the satellite navigation receiver is lost and recaptured. Background technique [0002] The satellite navigation receiver receives the direct sequence spread spectrum signal of the satellite, and after capturing the satellite signal, it must go through tracking, bit synchronization, frame synchronization and broadcast ephemeris analysis before it can assemble the correct satellite signal launch time for positioning. It takes dozens of seconds for the first positioning, even if the ephemeris has been obtained, it takes more than ten seconds to complete the frame synchronization positioning. The traditional positioning method is: re-acquisition, tracking, bit synchronization and frame synchronization after the satellite signal is out of lock, after analyzing the number of seconds in a week from the ephemeris, assem...

Claims

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Application Information

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IPC IPC(8): G01S19/42
CPCG01S19/42
Inventor 白明杰陈明权
Owner TIANJIN 764 COMM AIRMANSHIP
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