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A Simulation Method of Fractional Time Delay of Vlbi Baseband Signal

A fractional time delay and baseband signal technology, applied in the direction of instruments, etc., can solve the problems affecting the simulation effect, limiting the value range of the Fourier transform length N, etc., and achieve the effect of improving processing efficiency

Active Publication Date: 2017-11-03
SHANGHAI ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI
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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(N log 2 N), which limits the value range of the Fourier transform length N, which affects the simulation effect

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[0080] Below in conjunction with the drawings, preferred embodiments of the present invention are given and described in detail.

[0081] The present invention, promptly a kind of VLBI baseband signal fractional delay simulation method, it comprises the following steps:

[0082] Step S1, establishing an ideal time-delay system, and setting the frequency response function of the ideal time-delay system as:

[0083] h id (e jω ,D)=e -jωD (1),

[0084] Among them, D is the fractional time delay;

[0085] Step S2, using a Farrow structure filter bank to establish a finite impulse response system to approximate the ideal time-delay system, which includes:

[0086] Step S21, assuming that the frequency response function of the finite impulse response system is:

[0087]

[0088] Wherein, h(n, D) is the unit impulse response coefficient of the finite impulse response system, n=-N,...0,...N, and ΔT is the sampling interval;

[0089] Step S22, according to formulas (1), (2),...

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Abstract

The present invention relates to a VLBI baseband signal fractional time delay simulation method, which comprises the following steps: Step S1, establishing an ideal time delay system; Step S2, adopting a Farrow structure filter bank to establish a finite impulse response system to approach the ideal time delay Delay system; step S3, inputting the VLBI baseband signal into the finite impulse response system to generate a simulation signal with a fractional time delay D. The present invention rationally designs the coefficients of the Farrow structure filter bank, on the one hand, the whole processing process is carried out in the time domain, avoiding multiple conversion calculations between the time domain and the frequency domain, and effectively improving the processing efficiency; on the other hand, in the Under the premise of only adding a small amount of initial calculation, it can handle both severe and stable time delay changes, and at the same time ensure that the amplitude-frequency and phase-frequency responses in the entire frequency band are not distorted.

Description

technical field [0001] The invention relates to a method for simulating the fractional time delay of a VLBI baseband signal. 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 and astro-geodynamics. my country first used VLBI technology in the 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 the follow-up 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 test the system response. Therefore, signal simulation must be used to simulate multi-target obser...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D18/00
Inventor 郑为民童力
Owner SHANGHAI ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI
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