Method and device for weakening the influence of multipath on positioning accuracy of receiver antenna

Abstract

The invention relates to a method and a device for weakening the influence of multipath on the positioning accuracy of a receiver antenna. Under the condition that crude doppler frequency shift and code phase information are obtained, the method obtains advanced data, instant data and delay data of a local code generator, as well as local complex sinusoidal signals, product signal data between intermediate frequency signals received by a receiver and a local oscillator from a traditional closed loop expanding frequency intermediate frequency digital receiver; the data is sent to a digital signal processer to be processed; accurate multipath delay, multipath fading and phase estimation are obtained, then the estimation is combined with a local code of a receiving system, a code relative to carrier wave tracking loop and data of a carrier wave phase accumulator to calculate a value correction value of the codes and the carrier wave phase accumulator, and the data after being corrected is sent to a post processor and a user interface to be processed, therefore the positioning accuracy of the receiver antenna is enhanced. The device comprises a traditional expanding frequency receiver, a digital signal processor, a data output interface connected with the traditional expanding frequency receiver, and a data input interface connected with the traditional expanding frequency receiver.

Description

technical field [0001] The invention relates to the reception of a transmitted spread spectrum signal, in particular to a method and a device for reducing the influence of multipath on the positioning accuracy of a receiver antenna for distinguishing signal propagation paths, and belongs to the technical field of communication. Background technique [0002] In the process of using signal reception, such as receiving spread-spectrum signals sent by satellites, for position measurement and positioning, in typical cases such as GPS positioning systems, the multipath characteristics of the channels through which the signals pass will cause measurement and positioning errors. The impact of multipath on the positioning accuracy of the receiver antenna is mainly reflected in the distortion of the autocorrelation function of the pseudo-random spreading code. Theoretically, the receiver should converge to the position where the working area of ​​the code discriminator is zero, and th...

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Problems solved by technology

Theoretically, the receiver should converge to the position where the working area of ​​the code discriminator is zero, and the distortion of the autocorrelation function caused by multiple channels will cause the output positioning error, that is, under the direct path, the receiver converges on the delay of the non-direct path, and there is no direct path. The path will not converge to the shortest path, and because the multipath of the channel is constantly changing with time, although the multipath situation at a certain moment can theoretically calculate the position where the code discriminator works stably, this is different from the actual work There is a certain difference in the situation, that is, the code tracking loop may work at a non-theoretical value at a certain moment

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