Capture method for sine binary offset carrier modulation signals and apparatus

A technology of offset carrier and modulated signal, applied in the field of acquisition of sinusoidal binary offset carrier modulated signal, can solve the problems of high implementation cost and serious energy loss, achieve high commercial value, easy implementation, and reduce the probability of missed capture.

Inactive Publication Date: 2017-03-29
PEKING UNIV
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Problems solved by technology

Its advantage is that only the main peak is retained, and the removal is more thorough, but its energy loss is very serious, and the implementation cost is relatively high

Method used

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  • Capture method for sine binary offset carrier modulation signals and apparatus
  • Capture method for sine binary offset carrier modulation signals and apparatus
  • Capture method for sine binary offset carrier modulation signals and apparatus

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Embodiment Construction

[0045] The method of the invention regards the sinusoidal binary offset carrier modulation signal as a special time division multiplexing modulation signal. There are multiple pseudo-random codes locally, and the received signal is time-divisionally correlated with the local pseudo-random code, and finally combined to calculate the correlation energy, thereby realizing signal capture. The technical solutions of the present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

[0046] figure 1 It is a principle diagram of a method for capturing a sinusoidal binary offset carrier modulation signal of the present invention, and there are two pseudo-random code signals locally. After the satellite navigation signal received locally is down-converted, sampled and quantized, the obtained intermediate frequency BOC signal S_IF 101 can be expressed as:

[0047]

[0048] Among them, P is the total energy of the received...

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Abstract

The present invention discloses a capture method for sine binary offset carrier modulation signals. According to the capture method and apparatus, sine binary offset carrier signals are adopted as special time-division multiplexed modulation signals; under a local correlation condition, a plurality of paths of pseudo-random code signals are adopted; time division correlation-removing operation is performed on carrier-removed intermediate-frequency signals and the plurality of paths of pseudo-random code signals; the independent coherent integration values of each path are calculated; and the correlation results of all branches are combined, so that a final correlation result is obtained. With the time-division correlation method adopted, the influence of sub-peaks and zero points in an autocorrelation function can be effectively removed, and the probability of missed capture can be reduced. The capture method is similar to a traditional BPSK (binary phase shift keying) signal capture method. Compared with existing methods, the method of the invention is easier to implement and can assist in reducing system complexity. The present invention also provides an apparatus device for implementing the above method. Since cross-correlation or sideband energy loss are avoided, so that signal acquisition sensitivity can be improved. The capture method and the apparatus of the present invention therefore have high commercial value.

Description

technical field [0001] The invention relates to the technical fields of satellite positioning and signal acquisition and tracking, and relates to a method and device for acquiring a sinusoidal binary offset carrier (BOC) modulated signal. Background technique [0002] With the continuous development of GNSS (Global Navigation Satellite System, GNSS), the competition and compatibility issues among the new generation of navigation satellite systems have gradually become prominent. On the one hand, each navigation system is constantly improving and developing, and operates independently; on the other hand, how to be compatible and interoperable is on the agenda. In order to achieve the compatibility between various navigation systems, enable each navigation system to share the navigation frequency band spectrum resources, and improve the accuracy and performance of the existing navigation system, the new binary offset carrier (Binary OffsetCarrier) modulation method is adopted ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/30G01S19/29
CPCG01S19/30G01S19/29
Inventor 张彦彬刘瑞远于敦山路卫军
Owner PEKING UNIV
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