GNSS reflected signal frequency domain processing unit and method

Abstract

The invention provides a device for processing the frequency domain of a GNSS reflected signal and method thereof. The device comprises a receiving antenna, a radio frequency module, a signal processing module and an application processing module. The information of the direct projection signal and each multidiameter component such as code time lag and carrier frequency, phase are evaluated by cumulating the signal containing the reflected signal and spectral mapping and frequency domain analysis. The evaluated component of the multidiameter component can be used for use of the reflected signal, such as measuring the height using reflected signal, measuring the sea breeze. In view of tracking the direct projection signal from the receiver, the multidiameter component can be differentiatedand eliminated, therefore the receiver can ease the influence of the multidiameter on code and carrier wave at the condition of the closed close range multidiameter. When the system changes, the structure of the signal processing module is constant and the parameter is adjusted to track and process the signal and the effective solution plan is provided to use and eliminate the multidiameter.

Description

technical field [0001] The invention belongs to the field of signal processing, and relates to a signal processing method and device, in particular to a frequency domain processing device and method for GNSS reflected signals Background technique [0002] Multipath is the main source of error affecting accuracy in high-precision positioning. In the differential positioning system (DGPS), there are many error sources, including satellite clock error, ephemeris error, ionospheric delay error, tropospheric delay error, receiver clock error, thermal noise, multipath error, etc. Most of the errors can be eliminated by differential techniques and modeling techniques, but thermal noise and multipath errors cannot be eliminated due to the uncorrelation between the reference station and the user station. The error caused by thermal noise is usually only at the millimeter level and can be ignored, so multipath error becomes the main source of error in high-precision differential posi...

AI Technical Summary

Problems solved by technology

In this regard, the existing technologies, such as MEDLL, etc., have a large amount of calculation; and the capture and tracking are implemented by two mechanisms, and the structure is relatively complicated

[0005] Document Frequency-Domain Characterization GPS Multipath for Estimation and Mitigation. Dr. Chun Yang Sigtem Technology, Inc. ION GNSS 18th International Technical Meeting of the Satellite Division, 13-16 September 2005, Long Beach, CA, proposed to use FFT transform to estimate multipath The algorithm model of delay and complex gain, but did not point out the specific implementation structure, and did not consider in detail the impact of carrier synchronization error and additional phase error due to multipath on the algorithm implementation in combination with the carrier tracking state of the signal intermediate frequency. There is no method for estimating the carrier frequency and phase of direct and multipath signals

There is no solution for the adaptability of the algorithm under the condition of low signal-to-noise ratio

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