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Time generating method for single board precise global positioning system

A single-board, precise technology, used in satellite radio beacon positioning systems, positioning, radio wave measurement systems, etc., to solve the problem that GPS time cannot be accurate to the millisecond level.

Inactive Publication Date: 2004-08-18
ZTE CORP
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Problems solved by technology

[0003] Aiming at the problem that the current GPS time obtained from the single board cannot be accurate to millisecond level in the prior art, the present invention proposes a method for generating the precise global positioning system time of the single board

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  • Time generating method for single board precise global positioning system

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Embodiment Construction

[0015] According to the present invention, in the method for obtaining accurate global positioning system time on a single board in a code division multiple access system, the GPS clock signal obtained on the single board has only the PPNS clock signal and the current time of one pulse every N seconds (hereinafter referred to as TOD) message. N is any natural number less than 10, and PPNS is a precise timing pulse, which is sent every N seconds without parameters. The current time message is sent immediately after the PPNS clock signal, and its parameter is the GPS time corresponding to the last PPNS clock signal. If the time unit is M milliseconds, and the number of M milliseconds corresponding to N seconds is N×1000 ÷M. Therefore, the method of the present invention comprises the steps of:

[0016] (1) Make the GPS clock signal acquired on the single board only have a clock signal of one pulse every N seconds and the current time, where N is any number of natural numbers l...

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Abstract

The invention discloses a method for obtaining the GPS time for single board in a code division multiple access (CDMA) system comprising the steps of, making the GPS clock signal obtained by the single board only a PPNS clock signal and the present time, transmitting a PPNS on each of the N second boundary, transmitting the present time message right after the PPNS clock signal, making the value of the first memory device to be the sum of the parameter for the present message and N*100 / M before the application layer software receiving the present time message, in the next PPNS clock signal interruption, proceeding the operation of the second memory = the first memory, proceeding numbering to the M signal synchronizing the GPS clock produced by the hardware in N seconds, and determining the present single board GPS time.

Description

technical field [0001] The invention relates to a method for obtaining accurate global positioning system (hereinafter referred to as GPS) time on a single board in a code division multiple access (hereinafter referred to as CDMA) system, in particular to a method for obtaining accurate time on a single board in a CDMA system accurate to milliseconds A way to get accurate GPS time. Background technique [0002] The application layer software of some boards in the CDMA system needs to query the precise GPS time. For example, the application layer software of the vocoder / selector (hereinafter referred to as SVM) board requires GPS time in the forward voice packet sent. Synchronized frame numbers, Markov calls need to generate Markov data packets synchronized with GPS time, which requires the application layer software to be able to query the current accurate GPS time at any time. Therefore, a method for obtaining accurate GPS time must be provided on the SVM board. In the CD...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S11/08G01S19/27
Inventor 张海龙谭国平续斌
Owner ZTE CORP
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