System and method for receiving CBOC (Community-Based Outpatient Clinic) modulating signal

Abstract

The invention relates to a system and a method for receiving a CBOC (Community-Based Outpatient Clinic) modulating signal, belonging to the technical field of radio communication. The system comprises an antenna, a radio frequency front-end processing module and a correlator, wherein the correlator comprises a local subcarrier recurrence and division submodule, a correlation operation submodule and a recombination and output submodule. The method comprises the following steps of: receiving a navigation signal by the antenna and carrying out radio frequency front-end processing to obtain a digital intermediate-frequency signal; carrying out local recurrence and division processing on the digital intermediate-frequency signal to obtain a local recurrence part subcarrier signal; carrying out correlation processing on the digital intermediate-frequency signal and the local recurrence part subcarrier signal to obtain a correlation signal of the two signals; recombining the correlation signal to obtain a correlation signal without side peaks; and realizing signal capturing and tracking through the recombined signal. In the invention, a correlation result of the local recurrence signal and the received intermediate-frequency signal only has one main peak without side peaks, thereby the possibility of error signal capturing is eliminated.

Description

technical field [0001] The present invention relates to a system and method in the technical field of wireless communication, in particular to a system and method for receiving a CBOC (Composite Binary Offset Carrier, Composite Binary Offset Carrier) modulated signal. Background technique [0002] In July 2007, the United States and the European Commission decided to apply MBOC (Multiplexed Binary Offset Carrier) modulation to Galileo OS and GPS IIIA civilian signals at the same time. It is expected that Galileo E1OS signals in the EU will use CBOC modulation. Compared with BOC (Binary Offset Carrier, binary carrier offset) modulation, the power spectrum of the CBOC modulated signal provides richer high-frequency components, so it has higher pseudo-code tracking accuracy and anti-multipath performance. [0003] The CBOC (6, 1, γ / ρ) recommended by the Galileo system combines BOC (1, 1) and BOC (6, 1) in the time domain to obtain the spread-spectrum modulated subcarrier, and t...

AI Technical Summary

Problems solved by technology

However, the result of the signal correlation function proposed by this technology has multiple peaks. The central peak is called the main peak, and the rest of the peaks are side peaks. Due to the existence of the side peaks, in the process of signal reception, there will be miscapture problems, that is, the reception What the machine locks is not the main peak of the signal but the side peak, which will cause a large receiving error

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