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L2C signal generating method and device of GPS

A signal generation and signal technology, applied in the field of data communication, can solve the problem of low rate of capturing L2C signals, and achieve the effect of avoiding calculation, speeding up acquisition efficiency and wide application

Inactive Publication Date: 2017-06-13
SPACE STAR TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the purpose of the present invention is to provide a GPS L2C signal generation method and device to solve the technical problem of the low rate of capturing L2C signals in the prior art

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  • L2C signal generating method and device of GPS
  • L2C signal generating method and device of GPS
  • L2C signal generating method and device of GPS

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Embodiment Construction

[0063] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0064] refer to figure 1 , is an implementation flowchart of Embodiment 1 of a GPS L2C signal generation method provided by the present invention, wherein the method is applicable to the acquisition of the C code of the GPS L2 carrier, that is, the acquisition of the L2C signal.

[0065] In this embodiment, the method may include the following steps:

[0066] Step 101: Capture the L1CA signal of GPS and put it into the guidance flag to generate the code NCO a...

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Abstract

The invention discloses a GPS L2C signal generation method and device. The method includes: capturing the GPS L1CA signal and inserting a guide mark to generate a code NCO accumulation amount; based on the code NCO accumulation amount, generating E, P, L The local pseudo-code synchronization signal group and the capture pattern selection flag group of the three branches; based on the local pseudo-code synchronization signal group, use the CM shift register and the CL shift register to count the CM code and CL code in the L1CA signal Operation and shift operation to generate three groups of local CM codes and CL codes of E, P and L; based on the capture pattern selection flag group, perform time division multiplexing processing on the three groups of local CM codes and CL codes of E, P and L, To obtain three groups of local L2C codes of E, P and L; use the code cycle jump edge of the L1CA signal after a preset time to guide the three groups of local L2C codes of E, P and L based on the guidance flag, and generate the target L2C signal .

Description

technical field [0001] The present invention relates to the technical field of data communication, in particular to a GPS L2C signal generation method and device. Background technique [0002] At present, GPS (Global Positioning System, Global Positioning System) satellites simultaneously transmit L1 and L2 two-way spread spectrum signals, and their respective carrier center frequencies are 1575.42MHz and 1227.60MHz respectively, and the navigation message, CA code and P code are modulated on the L1 carrier , The navigation message, P code and C code are modulated on the L2 carrier. Civilian GPS receivers usually can only use the CA code on the L1 carrier. The military GPS receiver CA code and P code are widely used. [0003] With the implementation of GPS modernization, more and more GPS satellites use L2 carrier frequency to send civilian signals, so that GPS civilian users can also use L1 and L2 dual frequencies to correct ionospheric propagation errors, and this signal u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/24G01S19/37
CPCG01S19/24G01S19/37
Inventor 郝云霞崔鹤董娟娟李兴国赵文亮刘宪阳孟晶蒋勇
Owner SPACE STAR TECH CO LTD
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