Method for capturing GNSS-BOS (Global Navigation Satellite System-Binary Offset Carrier) modulation signal

A signal modulation technology, applied in the field of navigation and positioning, can solve the problems of unsuitable GNSS signals and long time consumption, and achieve the effects of long-time integration, improved sensitivity, and shortened processing time

Inactive Publication Date: 2012-01-18
HARBIN ENG UNIV
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Problems solved by technology

[0016] The purpose of the present invention is to solve the problem that the existing signal-to-noise ratio accumulation method takes a long time and is not suitable for the GNSS signal of the new modulation technology, and proposes a GNSS-BOC modulated signal for BOC modulated signal under low signal-to-noise ratio conditions capture method

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  • Method for capturing GNSS-BOS (Global Navigation Satellite System-Binary Offset Carrier) modulation signal
  • Method for capturing GNSS-BOS (Global Navigation Satellite System-Binary Offset Carrier) modulation signal
  • Method for capturing GNSS-BOS (Global Navigation Satellite System-Binary Offset Carrier) modulation signal

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[0038] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0039] The present invention proposes a method for capturing GNSS-BOC modulated signals, such as figure 1 shown, including the following steps:

[0040] Step 1. After the received intermediate frequency input signal is stripped from the carrier, it is divided into K sections, each section is N milliseconds of input data, wherein K≥2, N≥1;

[0041] Step 2: The local pseudo-random code Local_PRN signal is modulated by the subcarrier to generate a BOC-modulated local Local_BOC signal, and there are two signals of the BOC-modulated local Local_BOC signal and the local pseudo-random code Local_PRN signal at the same time. Because the correlation value of the PRN code depends on the accumulation result of the value corresponding to the value -1 in the PRN code. Therefore, in the process of using Fourier transform FFT for correlation calculation, after changing the median...

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Abstract

The invention provides a method for capturing a GNSS-BOS (Global Navigation Satellite System-Binary Offset Carrier) modulation signal under the condition of low signal-noise ratio aiming at a BOC modulation signal. The method comprises the following steps of: firstly, stripping a carrier of an intermediate-frequency input signal; secondly, changing values of each phase in a Local_PRN (Pseudo Random Number) signal and a Local_BOC signal modulated by the BOC from 1 to 0; and thirdly, acquiring the superposed intermediate-frequency input signal and the like. According to the method disclosed by the invention, the multi-peak characteristic of an autocorrelation function of the BOC modulation signal can be eliminated; the false detection and leak detection generated by the multi-peak characteristic when a GNSS receiver captures the BOC modulation signal can be avoided; the computational load for improving the correlation operation and coherent accumulation method is greatly reduced; the processing time of the GNSS receiver to the input signal is shortened; and the real-time property of the receiver is enhanced.

Description

technical field [0001] The invention belongs to the technical field of navigation and positioning, and in particular relates to a method for capturing GNSS-BOC modulation signals under the condition of low signal-to-noise ratio. Background technique [0002] The global satellite navigation system (GNSS) is a global position and time measurement system. Because it can provide high-precision, global, all-weather, real-time and continuous navigation services, it has a wide range of applications in different fields of military and people's livelihood. In view of the important role of satellite navigation systems, major military countries in the world are vigorously developing and improving their respective systems, such as the GPS system in the United States, the Galileo system in Europe, the GLONASS system in Russia, and the Beidou system in China. However, the signal frequency bands are constantly becoming crowded, and the mutual interference between signals is becoming more a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/29G01S19/30
Inventor 沈锋陈阳周宇贺瑞盖猛党超王兆龙李志强
Owner HARBIN ENG UNIV
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