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Improved video bandwidth resolution in dft-based spectrum analysis

A technology of video bandwidth and spectrum analyzer, which is applied in the field of improved video bandwidth resolution, and can solve problems such as rough resolution of VBW value

Active Publication Date: 2014-06-11
TEKTRONIX INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, structural differences make it impossible to use traditional VBW filtering methods on DFT-based spectrum analyzers
[0004] Although DFT-based spectrum analyzers can use trace averaging to emulate the effect of video filtering, trace averaging uses a discrete number of spectral traces, resulting in a coarse resolution of the available VBW values

Method used

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  • Improved video bandwidth resolution in dft-based spectrum analysis
  • Improved video bandwidth resolution in dft-based spectrum analysis
  • Improved video bandwidth resolution in dft-based spectrum analysis

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Embodiment Construction

[0011] figure 1 An embodiment 100 is shown comprising a video bandwidth frame 110 including signal acquisition using overlapping 130 resolution bandwidth frames 121-124. In order to produce a smooth spectral display of the analyzed signal in DFT spectral analysis, the spectral trace has been averaged over an integer number of traces. Trace averaging acts as a low-pass filter for the spectral trace, smoothing the video representation of the spectral content, with an effect similar to that of a video bandwidth filter in a traditional swept spectrum analyzer. The embodiments described below allow trace averaging over a non-integer number of averaging, thus providing video bandwidth emulation with user-specified VBW values.

[0012] In some embodiments, the standard deviation (σ) is used to characterize the smoothness of the spectral trace. For example, for N independent spectral measurements, the standard deviation of the averaged spectral trace is σ = ...

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Abstract

A method and apparatus for improved video bandwidth resolution in DFT-based spectrum analysis is disclosed. A first embodiment comprises an emulation of a continuous range of video bandwidths in DFT-based spectrum analysis using overlapping resolution bandwidth frames. A second embodiment utilizes frame weighting to reduce the standard deviation in the spectrum of noise signal to emulate a corresponding standard deviation of a specified video bandwidth.

Description

technical field [0001] The present invention relates to radio frequency or microwave receivers, and more particularly to a method for improved video bandwidth resolution in discrete Fourier transform (DFT) based spectral analysis. Background technique [0002] In a traditional swept spectrum analyzer, video bandwidth (VBW) filtering is used to reduce noise effects to the displayed signal amplitude. For example, video filters are often implemented as low-pass filters placed after a logarithmic envelope detector and can be used to detect signals close to a certain noise level. [0003] For swept spectrum analyzers, DFT-based spectrum analyzers emerged as attractive measurement tools because of their ability to perform vector analysis, combining fast measurement times with large spans and low resolution bandwidths (RBW), such as Real-time capabilities such as Digital Phosphor Spectral Analysis (DPSA). However, structural differences make it impossible to use traditional VBW f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/16
CPCG01R23/16
Inventor Y·何M·K·达西尔瓦K·A·恩格霍尔姆
Owner TEKTRONIX INC