Rapid associated acquisition device and method thereof

Abstract

The embodiment of the invention provides a rapid associated acquisition device, comprising an intermediate frequency carrier removing module, a code generator, a sampling module, a register module, a matching filter, a relevant result memorizer, a secondary code stripping module, a data processing module and a signal detection unit. On the other aspect, the embodiment of the invention provides a rapid associated acquisition method. In the technical scheme provided by the invention, rapid associated acquisition to the secondary code-containing GNSS (Global Navigation Satellite System) signal is provided through the matching filter technology and the FFT (Fast Fourier Transform) technology, thus, the aim of associated acquisition of satellite pseudo code primary position and secondary code primary position is realized; and the carrier frequency can be searched in parallel, the limit of the frequency offset sensitivity of the secondary code to the searching step size when performing pseudo code and secondary code associated acquisition is solved, the calculated quantity is reduced greatly, and the acquisition speed is improved, so that the device and the method provided by the invention are not only suitable for weak signal reacquisition with prior information, but also suitable for cold start high sensitivity acquisition.

Description

technical field [0001] The invention relates to the field of satellite positioning and navigation communication, in particular, the invention relates to a fast joint acquisition device and a method thereof. Background technique [0002] Global satellite positioning and navigation systems (GNSS), such as the GPS system, the Galileo system, the Beidou system, generally include a constellation of satellites that transmit GNSS signals that can be used by a receiver to determine the receiver's position. Satellite orbits are arranged in multiple planes so that the signal can be received from at least four satellites at any location on Earth. The GNSS signal transmitted by each GNSS satellite is a direct sequence spread spectrum signal. Each satellite transmits a different PRN (Pseudo Random Noise, pseudo-random noise) code, so that signals can be sent from several satellites at the same time and received by a receiver at the same time, with almost no interference between them. T...

AI Technical Summary

Problems solved by technology

Joint acquisition can carry out coherent integration for a long time, has the characteristics of high sensitivity, and can obtain the synchronization of pseudo code and secondary code at the same time, but its biggest problem is that due to the frequency offset sensitivity of secondary code, the frequency search step The length is very small, resulting in a large amount of calculation and slow capture speed

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