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A method for measuring parameters of intrapulse frequency-encoded signals based on short-time Fourier transform

A short-time Fourier, coded signal technology, applied in measurement devices, pattern recognition in signals, radio wave measurement systems, etc., can solve problems such as small signal-to-noise ratio, signal distortion, and large noise floor fluctuations

Active Publication Date: 2021-07-16
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0003] Under ideal conditions, accurate parameter measurement results can be obtained through instantaneous frequency measurement, time-frequency analysis, etc. Accurately measuring parameters of frequency-encoded signals is difficult

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  • A method for measuring parameters of intrapulse frequency-encoded signals based on short-time Fourier transform
  • A method for measuring parameters of intrapulse frequency-encoded signals based on short-time Fourier transform
  • A method for measuring parameters of intrapulse frequency-encoded signals based on short-time Fourier transform

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Embodiment Construction

[0029] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0030] The present invention provides a method for measuring parameters of intrapulse frequency coded signals based on short-time Fourier transform, the specific process is as follows figure 1 shown, including the following steps:

[0031] Step 1. Perform short-time Fourier transform (STFT) of the initial window length on the signal to be detected, calculate the length of a subcode according to the STFT result, and set the calculated length of the subcode as the window length for subsequent STFT processing.

[0032] In the embodiment of the present invention, in order to balance the time resolution and frequency resolution, the window length of short-time Fourier analysis is preferably designed as the symbol length. If the window length is too short, the frequency domain resolution will deteriorate, and within one subcode There is no change in frequency, ...

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Abstract

The invention discloses a short-time Fourier transform-based method for measuring intrapulse frequency coded signal parameters, which belongs to the technical field of radar signal reconnaissance, and can detect and receive signals in complex environments where there are intrapulse fluctuations, strong interference in the environment, and Intra-pulse frequency-encoded signals under weak conditions are used for parameter measurement. Specifically: perform short-time Fourier transform STFT on the signal to be detected, perform two-dimensional morphological filtering to smooth the noise floor, and perform two-dimensional cross-threshold detection, that is, calculate the adaptive threshold and large signal threshold, and take the adaptive threshold The larger value of the large signal threshold and the large signal threshold is used as the current detection threshold, and the threshold passing detection is performed on the STFT transformation result. The subcode is detected in the two-dimensional threshold crossing detection result. Intercept the data corresponding to each subcode from the original data of the signal to be detected according to the start and end positions of the detected subcode, and perform Fourier transform FFT to calculate the frequency of the subcode, and further calculate other parameters of the signal to be detected according to the frequency of the subcode .

Description

technical field [0001] The invention relates to the technical field of radar signal reconnaissance, in particular to a method for measuring parameters of intrapulse frequency coded signals based on short-time Fourier transform. Background technique [0002] The use of large bandwidth signals is one of the most common methods to improve radar range, speed and their joint resolution performance. Frequency coded signal is a kind of signal with large temporal bandwidth, which has good distance velocity resolution performance and narrow instantaneous bandwidth. Compared with linear frequency modulation signals, frequency coded signals have stronger anti-interference and low interception performance. [0003] Under ideal conditions, accurate parameter measurement results can be obtained through instantaneous frequency measurement, time-frequency analysis, etc. Accurately measuring the parameters of a frequency-encoded signal is difficult. Contents of the invention [0004] In...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/285G01S13/28G06K9/00G06T5/00G06T5/10G06T5/30
CPCG01S7/285G01S13/284G06T5/002G06T5/10G06T5/30G06T2207/10044G06T2207/20056G06F2218/04G06F2218/12
Inventor 刘国满高梅国王帅勋李永健
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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