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A method and device for capturing Galileo signals

A signal acquisition and signal technology, applied in the field of satellite positioning, can solve the problems of long search time, large amount of calculation, and large resource overhead of the receiver system, and achieve the effect of reducing the amount of calculation and saving system overhead

Active Publication Date: 2016-03-02
BEIJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The acquisition of the Galileo E1 signal in the prior art requires a two-dimensional search, traversing the code phases at each Doppler frequency, and the search takes a long time;
[0006] 2. In the process of finding the code phase with the largest correlation value between the ranging code in the Galileo E1 signal and the local ranging code of the receiver through SCPC, it is necessary to multiply the two groups of subcarriers with the Galileo E1 signal , the amount of calculation is large, and the system resource overhead of the receiver is large, resulting in low efficiency of the receiver to capture Galileo E1 signals

Method used

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  • A method and device for capturing Galileo signals
  • A method and device for capturing Galileo signals
  • A method and device for capturing Galileo signals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] An embodiment of the present invention provides a method for capturing Galileo signals, see figure 1 , the method flow includes:

[0039] 101: Set the selected code phase in the ranging code queue of the local data path and the ranging code queue of the local pilot path;

[0040] 102: Starting from the selected code phase, select a local data path ranging code and a local pilot one by one according to a preset time interval in the local data path ranging code queue and the local pilot path ranging code queue Road ranging code, until the local data path ranging code and the local pilot path ranging code in the local data path ranging code queue and the local pilot path ranging code queue complete a selection cycle;

[0041]103: Perform a product operation on the local data channel ranging code selected each time in the current selection cycle and the local pilot channel ranging code selected each time in the current selection cycle to obtain the local code used for the ...

Embodiment 2

[0046] An embodiment of the present invention provides a method for capturing Galileo signals, see figure 2 , the method flow includes:

[0047] 201: Set the selected code phase in the ranging code queue of the local data path and the ranging code queue of the local pilot path.

[0048] Wherein, the selected code phases of the set local data path and the ranging code of the local pilot path are the same.

[0049] Further, the selected code phase selected for the first time can randomly select a position in the ranging code queue of the local data path and the ranging code queue of the local pilot path, or can be selected from the ranging code queue of the local data path and the ranging code queue of the local pilot path. Starting from the first position in the code queue, the initial position for selecting the code phase is not limited here.

[0050] 202: Starting from the selected code phase, select a local data path ranging code and a local pilot one by one according to ...

Embodiment 3

[0081] An embodiment of the present invention provides a device for capturing Galileo signals, see image 3 , the device consists of:

[0082] The setting module 301 is used to set the selected code phase in the ranging code queue of the local data path and the ranging code queue of the local pilot path;

[0083] The selecting module 302 is configured to select a local data path ranging code one by one according to a preset time interval from the selected code phase in the local data path ranging code queue and the local pilot path ranging code queue and the local pilot path ranging code until the local data path ranging code and the local pilot path ranging code in the local data path ranging code queue and the local pilot path ranging code queue complete a selection cycle ;

[0084] The calculation module 303 is configured to perform a product operation on the local data path ranging code selected each time in the current selection cycle and the local pilot path ranging co...

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Abstract

The invention discloses a method and device for capturing Galileo signals, and belongs to the technical field of satellite positioning. The method includes the steps that product operation is performed on local data circuit ranging codes selected every time in the current selection period and local pilot frequency circuit ranging codes selected every time in the current selection period so that local codes used for operation can be acquired, and square operation is performed on a Galileo E1 signal received every time the local ranging codes are selected in the current selection period so that the square of the Galileo E1 signal can be acquired; the local codes used for operation and the squares of the Galileo E1 signals are input into a multiplying unit to perform multiplication so that the result of each calculation can be obtained, the result of each calculation in the current selection period is input into a coherent integrator, the correlation values between the local data circuit and the Galileo E1 signals as well as between the pilot frequency circuit and the Galileo E1 signals in the current selection period are calculated, and if the correlation values are larger than or equal to a preset threshold value, it is determined that the Galileo E1 signals are successively captured. With the method and device, the operation amount is reduced, and the system expense is saved.

Description

technical field [0001] The invention relates to the technical field of satellite positioning, in particular to a method and device for capturing Galileo signals. Background technique [0002] With the popularization of satellite positioning technology, people can obtain the required location information more conveniently, more timely and more accurately. In the positioning process, the receiver first needs to capture the Galileo E1 signal modulated by the CBOC (Composite Binary Offset Carrier) modulation method transmitted by the satellite, that is, to find the current Doppler frequency of the Galileo E1 signal and the Galileo E1 signal. The code phase with the largest correlation value between the ranging code and the local ranging code of the receiver can track the Galileo E1 signal and demodulate the message to realize the positioning function. Among them, the acquisition of the Galileo E1 signal needs to search the Doppler and ranging code phases separately, and find th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/30
CPCG01S19/24G01S19/30
Inventor 邓中亮尹露席岳李杰强李长明马宏涛朱棣李庆博赵洋
Owner BEIJING UNIV OF POSTS & TELECOMM