Time frequency door processing method based on superposition window suppression algorithm

Abstract

The invention provides a time frequency door processing method based on a superposition window suppression algorithm. The method comprises the following steps that: the width of a rectangular window used as a time domain door is localized; that is, the rectangular window is deposed into a plurality of small windows, wherein an accumulated value of time widths of the small windows is not less than the width of the large window; the small windows are utilized to select needed transmission signals of transmission paths as well as time and frequency domain conversion is carried out on data of the transmission signals of the transmission paths, wherein the transmission signals are selected by all the small windows; and, conversion results of the data of the transmission signals of the transmission paths are added, wherein the transmission signals are selected by all the small windows, so that a time and frequency domain conversion result of data of a transmission signal of a transmission path is obtained, wherein the transmission signal is selected by the superposition window. According to the invention, an algorithm of small window superposition is employed; therefore, requirements that a main lobe is narrow and a side lobe has a low level can be effectively considered simultaneously; meanwhile, data bulks of overturning and continuation are low; a requirement on hardware resources is reduced; and an application range is extended.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a time-frequency gate technology for a vector network analyzer based on a superposition window suppression algorithm. Background technique [0002] When the vector network analyzer tests the reflection or transmission parameters of the network, due to the multipath effect, the measured amplitude-frequency characteristics are the superposition of the amplitude-frequency characteristics of multiple transmission paths. In order to measure the expected amplitude-frequency characteristics of one or several transmission paths, the time-domain gate can be used to suppress the signals of undesired transmission paths according to the characteristics of different arrival times of signals of different transmission paths, so as to obtain accurate measurement results. [0003] like Picture 1-1 , shows a simplified diagram of the multipath model. The signal at the output port is th...

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Problems solved by technology

[0008] 1) In the window function method, the main lobe width and side lobe level of the window are a pair of contradictions, which cannot meet the requirements of narrow main lobe width and low side lobe level at the same time. In engineering implementation, it is often only based on different requirements Choose a different window function, or sacrifice the side lobe level to reduce the main lobe width, or increase the main lobe width in exchange for the suppression of the side lobe level, the two cannot be balanced

[0009] 2) The realization of the time-domain gate also involves the transformation of data from the frequency domain to the time domain and the transformation from the time domain to the frequency domain. These transformations require data flipping and continuation. The existing window function method has a large amount of computing data. Occupies a large storage space and slow computing speed, which is difficult to implement in some devices with limited storage resources and computing performance

Due to the data truncation effect caused by adding a time-domain gate, there is a Gibbs phenomenon in the time-frequency conversion process, which affects the accuracy of the converted frequency-domain data

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