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A method of capture under continuous transmission of spread spectrum communication system

A spread-spectrum communication and spread-spectrum code technology, which is applied in the field of spread-spectrum code acquisition under continuous transmission of a spread-spectrum communication system, and can solve problems such as long acquisition time

Inactive Publication Date: 2007-07-18
POTEVIO INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In detection probability Pd=0.9 and false alarm probability P FA = 0.01, the average acquisition time reaches 672 spreading code periods, and the acquisition time is very long

Method used

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  • A method of capture under continuous transmission of spread spectrum communication system
  • A method of capture under continuous transmission of spread spectrum communication system

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Embodiment Construction

[0023] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention will be further described in detail by citing the following embodiments and referring to the accompanying drawings.

[0024] The method provided by the present invention divides the spread spectrum long code of transmission into several short codes, such as dividing a 512-bit long code into 16 32-bit short codes, adopting the direct capture method of a double-dwell mode, and at the first time Detect the phase of the short code during the dwell period, that is, perform correlation integration between the phase of the short code and the current local PN code phase. If the correct phase is detected, enter the second dwell period, that is, the verification period; if not If the capture is successful, after adjusting the phase of the local PN code, such as adjusting the phase of half a chip, check the phase of the short code again until the capture is suc...

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Abstract

This invention discloses a trapping method in continuous transmission of spread spectrum communication system wherein at receiving end the long code from transmission end is divided in advance into several short code, the method contains A, at receiving end testing the correlation integral result of divided short code with local current PN code whether it reaches the preset threshold value 1, if it reaches then testing the spread spectrum code in current phase of local PN code, if the tested correlation integral result of said spread spectrum code with local PN code reaches the preset threshold value 2 then ending said trapping, if it does not reaches threshold value 2 then executing step B, if the tested the correlation integral result of divided short code with local current PN code reaches the preset threshold value 1 then directly executing step B. B, adjusting local PN code phase then executing step A until trapping accurate phase to end said trapping.

Description

technical field [0001] The invention relates to the sequence code synchronization technology of the spread spectrum communication system, in particular to a spread spectrum code acquisition method under the continuous transmission of the spread spectrum communication system. Background technique [0002] The essential prerequisite for the spread spectrum communication system to work normally is the acquisition and tracking of the spread spectrum code, so as to realize code synchronization. [0003] At present, there are two common acquisition methods of spreading codes, one is to use an auxiliary channel (code channel) to acquire, and the other is a direct acquisition method. [0004] The auxiliary channel (code channel) acquisition method is to use an independent auxiliary channel (code channel) to transmit the phase of the spreading code to be captured, because the demodulated auxiliary channel data contains the phase or phase interval information of the spreading code on ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/707H04L7/00
Inventor 匡巍陈庆方
Owner POTEVIO INFORMATION TECH
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