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Baseband signal processing method for GNSS receiver

A baseband signal processing and receiver technology, applied in the field of communication, can solve the problems of limited signal acquisition speed, weak signal processing ability, narrow tracking bandwidth, etc., to achieve integrated circuit implementation, fast operation speed, and reduce computational complexity Effect

Inactive Publication Date: 2008-02-27
BEIHANG UNIV
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Problems solved by technology

[0011] The traditional time-domain acquisition tracking signal processing method has limited signal acquisition speed, narrow tracking bandwidth, and weak processing ability for weak signals, which is not suitable for signal processing in high dynamic environment or interference environment

Method used

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  • Baseband signal processing method for GNSS receiver
  • Baseband signal processing method for GNSS receiver
  • Baseband signal processing method for GNSS receiver

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Embodiment Construction

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0037]The method is mainly applicable to the reception of the ordinary ranging code signal of the GNSS receiver, and completes the acquisition and tracking processing of the baseband signal in the frequency domain. During the capture process, FFT and IFFT calculation methods are used to perform group calculations to simplify time-domain correlation operations. In the code tracking process, first use FFT and IFFT operations to find out the positions of multiple correlation peaks, and then use the method of curve fitting to complete the accurate estimation of the code phase. In the process of carrier tracking, first determine the range of points for calculating DFT values ​​according to the rough carrier frequency estimation value obtained during acquisition, and use the sliding DFT method to calculate the DFT values ​​of these points, then use the interpolatio...

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Abstract

This invention discloses a baseband signal processing method for GNSS receivers, particularly for common ranging-code signal for GNSS receiver, completing: the baseband signal catching, the tracking processing within frequency domain, easily for realization in large scale integrated circuit. During the signal catching step, FFT and IFFT calculation method is used for grouped calculation to simplify the time-domain related calculation. During the code-tracking, thus obtained related peak positions are found, then precision est1 mate of code phase is fulfilled by utilizing curve-fitting method. During the carrier tracking, DFT values of these points is calculated by using sliding DFT method, after the DFT point values ranges are determined based on rough carrier frequency estimate, and then proceeding estimate of carrier frequency, data demodulation by using IFFT output result.

Description

technical field [0001] The invention belongs to the communication field and relates to a signal processing method, in particular to a GNSS receiver baseband signal processing method. Background technique [0002] The navigation message of modern satellite navigation systems (GPS, Beidou II, Galileo, etc.) using spread spectrum ranging codes modulates the pseudo-random code and carrier twice in the form of data, and then continuously transmits to the ground after forming radio waves. The user intercepts the satellite signals within the field of vision through the receiver to obtain navigation and positioning information. The communication basis of the system is spread spectrum communication, which is the brief working principle of the modern satellite navigation system. [0003] The signal structure of the satellite navigation system is jointly determined by the design goal of the system and the positioning accuracy requirements. The satellite signal includes three signal co...

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Application Information

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IPC IPC(8): H04B1/707H04L27/26H04L25/03
Inventor 张晓林李春宇张展李宏伟
Owner BEIHANG UNIV
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