Time measurement method for satellite navigation receiver

A satellite navigation and receiver technology, applied in the field of satellite navigation systems, can solve problems such as insufficient timing accuracy, and achieve the effects of simple method, improved timing accuracy, and high timing accuracy

Inactive Publication Date: 2014-03-26
TIANJIN 764 COMM AIRMANSHIP
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  • Abstract
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Problems solved by technology

[0003] In view of the problem of insufficient timing accuracy in existing satellite navigation receivers, the present invention provides a time measurement method for satellite navigation receivers

Method used

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  • Time measurement method for satellite navigation receiver

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Embodiment Construction

[0011] The present invention will be further described below in conjunction with accompanying drawing:

[0012] refer to figure 1 The time error involved in the present invention is the difference between the real time calculated by the satellite navigation receiver PVT and the time counted by the receiver.

[0013] The function of the loop filter is to filter out the noise in the time error and extract the effective time error.

[0014] The clock NCO can generate a corresponding frequency reference through the control of the frequency control word. In this solution, an accurate 1ms clock is obtained through precise adjustment of the frequency control word.

[0015] Count the 1ms clock of the clock NCO, and then get accurate time information (year, month, day, hour, minute, second) through the time information obtained in the satellite navigation message.

[0016] Use information such as local time, satellite navigation messages and pseudo-ranges to solve local position, spe...

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Abstract

The invention relates to a satellite navigation system, in particular to a time measurement method for a satellite navigation receiver. The time measurement method for the satellite navigation receiver comprises the steps that the error between the local time and the UTC or between the local time and the China Standard Time is figured out by the satellite navigation receiver by means of the PVT algorithm; denoising is conducted on the calculated time error through a loop filter, so that the accurate time error is obtained; a frequency control word used for adjusting a 1ms clock counter which can generate 1ms time is obtained according to the accurate time error, and a new frequency control word is used for controlling the 1ms clock counter to generate the accurate 1ms time; counting is conducted on the 1ms clock counter, so that the local time is obtained and is output, then the first step is executed again for time error calculation, and all the steps are executed repeatedly. The time measurement method for the satellite navigation receiver has the advantages that the method is simple, the time measurement accuracy is high, and time measurement accuracy of the satellite navigation receiver can be improved greatly. The time measurement method for the satellite navigation receiver can be applied to satellite time service equipment and provide accurate time information for equipment needing a time reference.

Description

technical field [0001] The invention relates to a satellite navigation system, in particular to a time measuring method for a satellite navigation receiver. Background technique [0002] The timing function of satellite navigation receiver is a very important technical application field, and its characteristic is that it can provide accurate time reference for other equipment. The timing accuracy of existing satellite navigation receivers is usually around 100ns. As the requirements for timing accuracy become higher and higher, the technical index of 100ns cannot fully meet the application requirements. Contents of the invention [0003] In view of the problem of insufficient time measurement accuracy in existing satellite navigation receivers, the invention provides a time measurement method for satellite navigation receivers. In this method, the satellite navigation receiver uses the PVT algorithm to solve the time error, and the time error is then filtered through ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G04R20/02
Inventor 张宪维陈明权王健蔡玉亭
Owner TIANJIN 764 COMM AIRMANSHIP
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