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Signal capturing method and device

A signal and code signal technology, applied in the field of binary offset carrier navigation signal capture, can solve the problems of increasing the complexity of navigation signal capture and increasing the search space of capture algorithms, so as to improve resource utilization efficiency, reduce calculation redundancy, and quickly capture Effect

Inactive Publication Date: 2016-08-24
PEKING UNIV
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Problems solved by technology

However, the autocorrelation peaks of the BOC signal have multi-peak characteristics, so that the capture of the BOC signal requires a smaller correlation interval, which increases the search space of the capture algorithm
At the same time, in order to improve the spread spectrum gain of the GNSS system, the new BOC signal adopts a long pseudo-code structure, which increases the complexity of navigation signal acquisition

Method used

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  • Signal capturing method and device
  • Signal capturing method and device

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Embodiment Construction

[0033] The features and technical effects of the technical solution of the present invention will be described in detail below with reference to the accompanying drawings and in conjunction with exemplary embodiments, but the present invention is not limited to this embodiment.

[0034] Such as figure 1 As shown, the present invention provides an embodiment of signal acquisition method, and described method comprises the following steps:

[0035] Step 101, acquiring satellite signals.

[0036] For example: after the satellite signal is down-converted and then sampled, a digital intermediate frequency signal can be obtained.

[0037] In step 102, the satellite signal is mixed with the local carrier to obtain a mixed frequency signal. The frequency mixing adopts two ways of mixing: the first way of mixing is the mixing of the satellite signal and the sine signal of the local carrier to obtain the same direction mixing signal; the second way of mixing is the mixing of the satel...

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Abstract

The invention discloses a signal capturing method and device. The method is characterized in that a satellite signal is obtained; frequency mixing is carried out on the obtained satellite signal and a local carrier wave, and Doppler stripping is realized; accumulative summation is carried out on a frequency mixed signal in a chip; correlation integration is carried out on an accumulated signal and a locally generated code signal; and a coherent result is sent to a capturing decider to carry out capturing decision. According to the method, intermediate results can be reused, and the computing resource is saved. The device which realizes the method can accelerate the signal capturing process, and has higher application value.

Description

technical field [0001] The present invention relates to the field of global satellite navigation systems, more specifically, to a method and device for capturing binary offset carrier navigation signals. Background technique [0002] The Global Positioning System (GNSS) is widely used in the field of navigation and has become the main source of information for both military and civilian location services. In order to further enhance the anti-multipath capability of satellite navigation signals and maintain compatibility with existing signals, a new generation of satellite navigation systems uses binary offset carrier (Binary-Offset-Carrier, BOC) modulated signals. [0003] Different from the traditional satellite navigation signal, before the carrier is shifted, the BOC modulation signal uses a binary square wave to modulate the pseudorandom code (Pseudorandom Noise, PN), so as to realize the separation of the signal spectrum. Due to the use of quadratic square wave modulat...

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Application Information

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IPC IPC(8): G01S19/29G01S19/30
Inventor 雷登云路卫军崔小欣黄永灿于敦山
Owner PEKING UNIV
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