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Method and device for capturing L2C signals in GPS

A signal and signal receiving technology, which is applied in the field of Global Positioning System (GPS), can solve the problem of long capture time

Active Publication Date: 2014-06-18
TSINGHUA UNIV
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  • Description
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Problems solved by technology

[0003] Capturing the L2C signal is the prerequisite for the work of the L2C receiving terminal, but the existing capture method takes a long time to capture

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  • Method and device for capturing L2C signals in GPS
  • Method and device for capturing L2C signals in GPS

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Embodiment Construction

[0046] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the Some, but not all, embodiments are invented. 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.

[0047] The embodiment of the present invention proposes a fast acquisition method for L2C signals applicable to small-scale FFT for GPS L2C navigation terminals such as hand-held devices using DSP, which reduces the difficulty of pseudo code capture, improves the pseudo code search speed, and shortens the pseudo code capture time. Shorten the first positioning time of L...

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Abstract

The invention discloses a method and device for capturing L2C signals in the GPS. The method includes the steps of firstly, generating periodic local CM code sequences, and adding the number zero behind each CM code sequence; secondly, setting up local composite codes according to the CM code sequences which are generated in the first step and where the numbers zero are added; thirdly, sampling the local composite CM code sequences generated in the second step to obtain N point long sequences and processing the N point long sequences; fourthly, sampling intermediate-frequency signals processed by the front end of a receiver according to the sampling rate; fifthly, conducting digital down conversion on the signals sampled in the fourth step to obtain carrier frequency cells to be searched; sixthly, selecting N point receiving signals from the fifth step to be processed; seventhly, multiplying the result obtained in the third step by the result obtained in the sixth step, and conducting processing to obtain N related values; eighthly, detecting the (W+nN)th code phase position according to the code phase position corresponding to the largest related value if the largest related value in the seventh step is larger than a preset capturing threshold; ninthly, adjusting a digital down conversion unit so as to search the next carrier frequency cell till the whole space to be searched is completely searched if no related values larger than the preset capturing threshold exist in the seventh step.

Description

technical field [0001] The present invention relates to the field of the global positioning system (GPS), in particular to a method and device for capturing L2C signals in the GPS. Background technique [0002] In the process of modernization of the Global Positioning System (GPS), in order to improve signal acquisition and tracking capabilities and improve user performance under weak signal conditions, a new type of civilian signal, namely L2C (English full name: L2civil, where L2 means its Signal frequency point in GPS) signal. The spreading sequence adopted by this signal is significantly different from the widely used C / A code signal. It mixes medium-length pseudocodes (called CM codes) and long-period pseudocodes (called CL codes) through a time-division data multiplexing technique. After adopting this technology, the navigation message only modulates the CM code, not the CL code. Adjust the CM code with the navigation message as the data channel to provide the recei...

Claims

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Application Information

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IPC IPC(8): G01S19/30
CPCG01S19/26G01S19/30
Inventor 李洪陆明泉
Owner TSINGHUA UNIV
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