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Method and device for realizing code phase searching

A code phase and phase technology, which is used in measurement devices, satellite radio beacon positioning systems, instruments, etc., can solve the problems of difficult code phase search and large complexity.

Active Publication Date: 2017-11-14
DATANG SEMICON DESIGN
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Problems solved by technology

[0015] If the above-mentioned parallel code phase search algorithm is used to obtain high-resolution code phase search results, a large-scale Fourier transform operation is inevitably required, and a large-scale Fourier transform operation requires greater complexity, resulting in code phase difficult to search

Method used

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  • Method and device for realizing code phase searching
  • Method and device for realizing code phase searching

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Embodiment Construction

[0081] In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

[0082] figure 2 A structural block diagram of a device for implementing a code phase search according to an embodiment of the present invention, such as figure 2 As shown, it includes: a synthesis unit, a first branch and a second branch; where,

[0083] The combining unit is used to combine the in-phase mixing result and the quadrature mixing result of the code phase search circuit to generate a complex signal, and send it to the first branch and the second branch;

[0084] It should be noted that the in-phase mixing result of the code phase search circuit is generated a...

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Abstract

The invention discloses a method and a device for realizing code phase searching. The method comprises the steps of: combining in-phase and quadrature mixing results to generate a complex signal; downsampling the complex signal to obtain a first downsampled signal; generating first and second local conjugate results by means of a full coarse acquisition (C / A) code and a partial C / A code; subjecting the first downsampled signal to Fourier transform to obtain a first transform result, multiplying the first transform result by the first local conjugate result by means of a multiplier, and performing Fourier inverse transform, modulus operation and phase judgment to obtain a first judgment result; and acquiring a sample point of Fourier transform by means of the first judgment result, and performing Fourier transform on the complex signal to obtain a second transform result, and multiplying the second transform result by the second local conjugate result by means of a multiplier, and performing Fourier inverse transform, modulus operation and phase judgment combined with the first judgment result to obtain a second judgment result, so as to obtain the code phase. According to the method and the device, the code phase is obtained by performing downsampling on the complex signal and the like, thereby ensuring the precision of the code phase searching and reducing the complexity.

Description

technical field [0001] The invention relates to signal processing technology, in particular to a method and device for realizing code phase search. Background technique [0002] Global Navigation Satellite System (GNSS, Global Navigation Satellite System) is playing an increasingly irreplaceable and important role in people's daily life, especially in the fields of navigation, timing, surveying and mapping, and so on. At present, global satellite navigation systems mainly include the Global Positioning System (GPS) of the United States, the Beidou (BD) system of China, the GLONASS (GLObal NAvigation Satellite System) of Russia, and the Galileo (Galileo) system of Europe. In China and the Asia-Pacific region, GPS and Beidou systems are widely used; while in Russia, GPS and GLONASS are widely used. Since the Galileo system is far from mature, formal services cannot be provided yet. When using the global satellite navigation system for positioning, timing and other services, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/30
CPCG01S19/30
Inventor 宋挥师
Owner DATANG SEMICON DESIGN
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