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A kind of doppler compensation acquisition method and device based on tong detector pseudo-code

A technology of Doppler compensation and acquisition device, applied in the field of pseudo-code Doppler compensation and acquisition and device based on Tong detector

Active Publication Date: 2018-10-02
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose a pseudo-code Doppler compensation acquisition method and device based on the Tong detector for the defect that the code Doppler movement in the traditional method causes the platform effect of the pseudo-code correlation result

Method used

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  • A kind of doppler compensation acquisition method and device based on tong detector pseudo-code
  • A kind of doppler compensation acquisition method and device based on tong detector pseudo-code
  • A kind of doppler compensation acquisition method and device based on tong detector pseudo-code

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Embodiment 1

[0090] This embodiment illustrates the structural block diagram of applying the "Acquisition Method and Device for Doppler Compensation Based on Pseudo-Code in Tong Detector" of the present invention to the acquisition of direct sequence spread spectrum signals under large frequency offset and low SNR. In this embodiment, the radio frequency is f RF=2.2GHz, the period of the pseudo-code is 1023, and the chip rate is R cp = 3.069Mcps at a data rate of R D =2kbps, the correlation time length is taken as 2 pseudo-code cycles, i.e. M=2, the carrier Doppler frequency is f d ∈(-200kHz,200kHz) as an example, by figure 1 It can be seen that the signal received by the receiver antenna is down-converted and sampled by the RF front-end, and then the frequency is searched in parallel, and the result is output to the folding and adding module and the pseudo code movement compensation module; the output of the folding and adding module is sent to the FFT module After processing by the FF...

Embodiment 2

[0092] This embodiment illustrates a schematic diagram of applying the present invention "A Doppler Compensation Acquisition Method and Device Based on Tong Detector" to the acquisition of direct sequence spread spectrum signals with large frequency offset and low signal-to-noise ratio.

[0093] figure 2 Be the schematic diagram of this method and the schematic diagram of this embodiment, as can be seen from the figure, this method comprises the following steps:

[0094] Step A: Perform down-conversion and sampling rate f s = 6.138MHz AD sampling, get the above input signal r d (n);

[0095] Step B: the pseudocode correlation module samples a period pseudocode sequence generated by the memory module at the same sampling rate as the AD sampling unit, and then inputs the FFT module for processing and stores it into the memory module, specifically:

[0096] Step B.1 Pseudo-code correlation module with the same sampling rate f as the AD sampling unit s A periodic pseudo-code ...

Embodiment 3

[0119] This embodiment specifically illustrates the folding and adding method described in step 4 of the present invention and the folding and adding algorithm of step D in embodiment 1, and the algorithm is schematically shown as image 3 shown. from image 3 It can be seen that the specific steps of the fold-and-add algorithm are:

[0120] Step D.1 The original pseudo-code sequence (original sequence) contains M pseudo-code periodic sequences whose number of sampling points is L, and the corresponding sampling points of the pseudo-code period are represented by a 0 ,...a L-1 It means that in this embodiment, M=2, L=2046;

[0121] Step D.2 The folding and adding module performs grouping and folding on the original sequence whose number of sampling points is M×L with the length of one pseudocode cycle, and each group has a length of 2046 sampling points;

[0122] In step D.3, the folding and adding module divides the folding sequences re-divided in step D.2 into a group of...

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Abstract

The invention provides a capture method (abbr. the method) based on a pseudo code doppler compensation of a Tong detector and a capture device (abbr. the device) based on a pseudo code doppler compensation of a Tong detector. The method comprises steps that: 1, a radio frequency front end carries out down-conversion and sampling on a receiving signal; 2, a pseudo correlation module samples a pseudo code sequence in a period and the pseudo code sequence in the period is stored after passing through an FFT module; 3, a parallel frequency searching module strips a carrier doppler; 4, a folding addition module groups results obtained in the step 3 by taking a pseudo period as a unit and then carries out folding addition on the results; 5, the pseudo code correlation module calculates a correlation result between the signal subjected to the folding addition and a local pseudo code; 6, a code walking compensation module estimates code estimates code doppler walking which is required to be compensated for stay of a Tong detector in different frequency searching channels; 7, a Tong detector module detects and compensates the code doppler walking; and 8, whether a counting variable reaches a threshold value or not is judged and corresponding operation is performed.

Description

technical field [0001] The invention relates to a pseudo-code Doppler compensation acquisition method and device based on a Tong detector, and belongs to the technical field of direct sequence spread spectrum communication and joint-domain pseudo-code acquisition. Background technique [0002] The baseband signal processing of the direct sequence spread spectrum system mainly includes two modules of acquisition and tracking. The acquisition module needs to realize a two-dimensional rough estimation of the carrier frequency and pseudo code phase of the received signal. After the acquisition is successful, the obtained rough estimation is sent to the tracking module as the initial value of the tracking module. [0003] In space-based measurement and control, satellite communication and other application environments, due to reasons such as high dynamics, long transmission distance, and limited signal transmission power, low information rate direct sequence spread spectrum sign...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7075
CPCH04B1/70758
Inventor 郇浩郭一超陶然郭建敏
Owner BEIJING INSTITUTE OF TECHNOLOGYGY