Short-time Fourier transformation-based intra-pulse frequency coded signal parameter measurement method

A technology of short-time Fourier transform and coded signals, which is applied in measurement devices, pattern recognition in signals, and radio wave measurement systems, etc. It can solve problems such as small signal-to-noise ratio, signal distortion, and large noise floor fluctuations.
CN110632563AActive Publication Date: 2019-12-31BEIJING INSTITUTE OF TECHNOLOGYGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING INSTITUTE OF TECHNOLOGYGY
Publication Date
2019-12-31

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Abstract

The invention discloses a short-time Fourier transformation-based intra-pulse frequency coded signal parameter measurement method and belongs to the technical field of radar signal reconnaissance. With the method adopted, parameter measurement can be performed on intra-pulse frequency coded signals under the conditions of intra-pulse fluctuation, strong interference and weak received signals in acomplex environment. The method specifically comprises the following steps that: short-time Fourier transformation (STFT) is carried out on to-be-detected signals; two-dimensional morphological filtering is carried out to smooth a noise floor; two-dimensional over-threshold detection is carried out, namely, an adaptive threshold value and a large signal threshold are calculated, with the larger one in the adaptive threshold value and the large signal threshold adopted as a current detection threshold, over-threshold detection is performed on the transformation result of the STFT; sub-codes aredetected in a two-dimensional over-threshold detection result; data corresponding to each sub-code are intercepted from the original data of the to-be-detected signals according to the detected starting and terminal positions of the sub-codes, Fourier transformation (FFT) is performed, the frequency of the sub-codes can be calculated, and other parameters of the to-be-detected signals are calculated according to the frequency of the sub-codes.
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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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