VLBI baseband signal Decimal delay simulation method

Abstract

The invention relates to a VLBI baseband signal decimal delay simulation method, comprising steps of establishing an ideal time delay system, adopting an Farrow structure filter group to constitute a finite impulse response system in order to approximate the ideal time delay system, and inputting the VLBI baseband signal into the finite impulse response system in order to generate a simulation signal having the decimal time delay amount. On one hand, the VLBI baseband signal Decimal delay simulation method enables the whole processing process to be proceeded in the time domain, prevents the multiple conversion calculations between the time domain and the frequency domain, and effectively improves the processing efficiency through reasonably designing the coefficient of the Farrow structure filter, and, on the other hand, the VLBI baseband signal Decimal delay simulation method can well process the conditions where the time delay is dramatically changed and is stable on the premise that only little initial calculation is added, and guarantees that the amplitude-frequency and the phase frequency response are not distorted.

Description

Technical field [0001] The invention relates to a VLBI baseband signal fractional time delay simulation method. Background technique [0002] Very long baseline interferometry (VLBI) is a technical method that appeared in the field of radio astronomy in the late 1960s. It has the characteristics of high resolution and high measurement accuracy, and is widely used in the fields of astrophysics, astrometry, astronomy and geodynamics. my country first used VLBI technology in a lunar exploration project in 2007. With the deepening of the project and the development of deep space exploration, the requirements for the VLBI system are getting higher and higher. In subsequent engineering tasks, it is necessary to track multiple target detectors at the same time. Since the observation conditions are not yet available, characteristic data cannot be obtained before launch to verify the system response. Therefore, signal simulation must be used to simulate the multi-target observation signa...

AI Technical Summary

Problems solved by technology

However, the Fourier transform is currently implemented using open source or commercial software packages (such as FFTW, IPP, CuFFT, etc.). When the Fourier transform length N satisfies certain rules, its computational complexity can reach the ideal O(Nlog 2 N), which limits the value range of the Fourier transform length N, which affects the simulation effect

Images