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Method for fast capturing COMPASS signal

A signal and fast technology, applied in the field of satellite navigation, can solve problems such as speed limit, achieve the effect of increasing speed, shortening time-consuming, and ensuring capture accuracy

Inactive Publication Date: 2012-10-03
JIANGSU UNIV OF SCI & TECH
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Problems solved by technology

Therefore, among the three methods, the code phase parallel acquisition method is the fastest, but the carrier frequency serial search also limits the further improvement of the speed

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  • Method for fast capturing COMPASS signal
  • Method for fast capturing COMPASS signal

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Embodiment Construction

[0033] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.

[0034] Take the capture of COMPASS-B1 signal as an example below, combined with figure 1 Describe in detail. figure 1 It is a flowchart of the fast capture of COMPASS signals of the present invention.

[0035] Since the COMPASS-B1 signal is affected by Doppler frequency shift, the frequency shift range is between -10KHz~10KHz. After down-conversion, the signal frequency becomes f-10KHZ~f+10KHZ, and considering the power consumption of hardware resources, Therefore, in ...

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Abstract

The invention discloses a method for capturing a satellite signal in the technical field of satellite navigation and particularly relates to a method for fast capturing a COMPASS signal. According to the method, a path of serial search of a carrier frequency is converted into four paths of parallel search. The method comprises the processes of: obtaining a signal C(k) from a local pseudo-random code by FFT (fast fourier transform) and complex conjugate transformation, locally generating four paths of carrier waves to multiply by the COMPASS signal, obtaining four paths of signals Xj(k) (j=1,2,3,4) via FFT, respectively multiplying C(k) by Xj(k) (j=1,2,3,4), and delivering and obtaining a signal absolute value of rj(n) (j=1,2,3,4) via IFFT (inverse fast fourier transform), wherein the maximal value of each path of obtained signal is compared with the preset threshold to determine whether the satellite signal is really captured. The capturing speed of the COMPASS signal is improved under the condition without affecting the capturing precision.

Description

technical field [0001] The invention belongs to the field of satellite navigation, and in particular relates to a method for capturing COMPASS signals. Background technique [0002] The Beidou satellite navigation system is an independently developed and independently operated global satellite navigation system that China is implementing. It is divided into two stages: Beidou I and COMPASS or Beidou II. After the completion of the COMPASS satellite navigation system, it will provide two services, one is an open service for unauthorized users, and the other is an authorized service for authorized users. The global positioning accuracy of the open service can reach 10m, the timing accuracy can reach 20ns, and the speed measurement accuracy can reach 0.2m / s. Authorized services can provide higher-precision positioning, timing, and speed measurement services. The differential positioning accuracy in a local area can reach 1m, and the COMPASS satellite can be used for message c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/29
Inventor 杨奕飞苏丽娜李效龙张冰齐亮袁伟王玉龙胡伟华
Owner JIANGSU UNIV OF SCI & TECH
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