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Method for capturing pseudo-code sequence

A pseudo-code sequence and sequence technology, applied in the field of direct sequence spread spectrum communication, can solve the problems of large amount of calculation and long search time

Inactive Publication Date: 2008-06-25
XIAN HUAXUN MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually in a general receiver, for the synchronization of the code phase, it is necessary to search all the code phases, the calculation amount is large, and the search time is long

Method used

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  • Method for capturing pseudo-code sequence

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0088]Embodiment: When m=32, n=32, 32 code phase sequences per group, 32 groups in total, 31 code phase sequences in the last group, because the difference is not much with 32, the same threshold can be used as the judgment condition or threshold 31 / 32 of is used as the judgment condition. Then sum the code phase sequence of each group, and then integrate with the satellite pseudo-random code sequence. If the correlation integral value of the 12th group is greater than the threshold 2dB, it means that this group contains the satellite pseudo-random code sequence, then stop grouping search. Then in the 12th packet, a specific search for 32 code phase sequences is carried out. If the value of the 25th code phase sequence is greater than 3dB after correlation integration, then it can be judged that the satellite pseudo-random code sequence has been found. The arrangement order of the code phase sequence is 11×32+25=377, and the calculation amount of the correlation integral is 1...

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PUM

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Abstract

The invention relates to the direct sequence spectrum spreading communication technical filed, in particular relates to a pseudocode sequence capturing method. The invention divides all the different-code phase sequence of a local replication code evenly into n subgroups, each subgroup includes m different-code phase sequences; adding up the m different-code phase sequences of each subgroup can get a composite code sequence of the subgroup. First, the invention searches the composite code sequences which include a satellite pseudocode sequence by correspondingly integrating a composite code sequence respectively with the received satellite pseudocode sequences; then, the invention searches the satellite pseudocode sequences in the m code phase sequences in the corresponding subgroups of the composite code sequence. The method can be widely used in software receivers for receiving GPS signals, Galileo signals, and other communication signals, and can flexibly capture direct sequence spectrum spreading codes with different length.

Description

technical field [0001] The invention relates to the technical field of direct sequence spread spectrum communication, in particular to a method for acquiring a pseudocode sequence. Background technique [0002] The concept of software radio refers to the use of programmable microprocessors instead of analog or digital devices to realize most of the functions of signal processing. Software radio closely links the simulation and implementation of the receiver and has greater flexibility. Since the emergence of the concept of software radio, the hardware-based digital radio technology began to develop in a more flexible and advanced direction in the future from the 1980s. [0003] The implementation of the software capture signal algorithm can make the receiver more flexible to adapt to different pseudo-random noise sequences of different code lengths, carrier frequency, phase changes, etc., and also provides a guarantee for the wide use of the receiver. 1) The flexible config...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707G01S5/14G01S19/30H04B1/7075
Inventor 王江安周文益何秋生
Owner XIAN HUAXUN MICROELECTRONICS
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