Base band processing unit capable of simultaneously receiving pseudo satellite and satellite signals and method thereof

Abstract

The invention belongs to the technical field of wireless navigation positioning, and in particular relates to a base band processing unit capable of simultaneously receiving pseudo satellite and satellite signals and a method thereof. The base band processing unit includes: a signal separation selector, base band correlator channels, a local clock unit, a tracking processing unit, a telegraph text processing unit, a navigation application management module and an external interface module. The method includes: the signal separation selector identifies and separates pseudo satellite signals from satellite signals; the pseudo satellite signals and the satellite signals enter different base band correlator channels; the tracking processing unit completes searching, locating and tracking of the signals, and sends original navigation telegraph text data to the telegraph text processing unit; the telegraph text processing unit separates the ephemeris, the almanac, the system clock corrected parameters and ionospheric delay model parameters which are sent by the satellites and pseudo satellites. The navigation application management module conducts real-time data uploading of the base band processing unit through the external interface module, and accurately calculates and corrects local clock differentiation information so as to increase the corrected accuracy of the time frequency signals of the base band processing unit and increase positioning accuracy.

Description

technical field [0001] The invention belongs to the technical field of radio navigation and positioning, and in particular relates to a baseband processing unit capable of simultaneously receiving pseudolites and satellite signals and a method thereof. Background technique [0002] The pseudolite signal adopts the pulse broadcasting mode. For the non-cooperative demodulation of this type of pulse signal, it is difficult to achieve carrier synchronization and timing synchronization simply through the feedback loop, which will inevitably cause the loss and destruction of pseudolite navigation information. Therefore, for pseudolite pulse The demodulation of the signal requires fast frequency tracking, short frequency measurement time and high precision, and the selected demodulation algorithm must also rely on fast signal discovery. [0003] The navigation baseband processing unit is the core component of navigation signal reception. The navigation baseband processing unit shou...

AI Technical Summary

Problems solved by technology

[0004] At present, most of the navigation baseband processing units on the market use a single processing chip architecture, and the capture and tracking and message decoding are processed by the same channel. The work efficiency of the processor and the complex task scheduling strategy have also brought great difficulties to the software implementation.

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