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Satellite navigation signal capturing method and device based on blind aliasing and blind separation

A satellite navigation signal and aliasing signal technology, applied in the field of GPS signal processing, can solve the problems of long capture time and huge amount of computation

Inactive Publication Date: 2014-12-10
GUANGDONG UNIV OF TECH
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Problems solved by technology

Time-domain serial search and capture method has the advantages of simple structure and easy implementation, but its computational complexity is huge and the capture time is long

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  • Satellite navigation signal capturing method and device based on blind aliasing and blind separation
  • Satellite navigation signal capturing method and device based on blind aliasing and blind separation

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Embodiment Construction

[0048] The accompanying drawings are for illustrative purposes only and cannot be construed as limiting the patent;

[0049] For those skilled in the art, it is understandable that some well-known structures and descriptions thereof may be omitted in the drawings.

[0050] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0051] A satellite navigation signal acquisition method based on blind aliasing and blind separation, such as figure 1 shown, including the following steps:

[0052] S1: After the satellite navigation signal is received by the antenna, it is down-sampled and mixed into an intermediate frequency signal r(t),

[0053] r ( t ) = 2 AC ( t ) D ( t ) cos ...

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Abstract

The invention discloses a navigation signal capturing method and device based on blind aliasing and blind separation. The method comprises the following steps: performing FFT (Fast Fourier Transform) operation on an intermediate frequency signal r(t) generated by down-sampling frequency mixing to obtain R(k); generating a local duplicated code signal, and performing blind aliasing of a plurality of frequency points in a preset Doppler frequency shift range; performing FFT operation on a blind aliasing signal to obtain a blind aliasing signal of a frequency domain, and performing duplicating and conjugation on the blind aliasing signal to obtain H(k)*; multiplying R(k) with H(k) to obtain Y(k), performing IFFT (Inverse Fast Fourier Transform) operation on Y(k) to obtain y(t), and finding a position where the y(t) amplitude is maximum for serving as a pseudo-code phase value c(t); multiplying the obtained c(t) with the intermediate frequency signal r(t) to realize blind separation of the pseudo-code signal and a carrier signal in order to obtain a carrier signal x(t); performing FFT operation on x(t) to obtain a signal frequency spectrum, and finding a frequency value corresponding to a maximum peak, namely, a carrier Doppler frequency shift value kd in order to finish capturing work. The method and the device are suitable for capturing GPS (Global Positioning System) satellite navigation signals, the operand required by signal capturing is further reduced, and the capturing speed and capturing efficiency are increased.

Description

technical field [0001] The present invention relates to the field of GPS signal processing, more specifically, to a satellite navigation signal acquisition method and device based on blind aliasing and blind separation. Background technique [0002] The global satellite navigation system is a satellite navigation system that can provide users with all-weather, full-time, high-precision positioning and navigation services. As an important information infrastructure and strategic facility of the country, the global satellite navigation system is an important symbol of the country's comprehensive national strength and an important cornerstone of national security. It provides technical support for the national economy and national defense construction, and has significant economic benefits and social significance. [0003] The acquisition process of satellite signal is a three-dimensional parameter acquisition process. After selecting the parameters of a satellite number, usin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/29G01S19/30
CPCG01S19/24G01S19/29
Inventor 谢胜利周郭许谢侃易清明
Owner GUANGDONG UNIV OF TECH
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