A Method of Adaptive Time-Frequency Transformation of Polynomial Phase Signal Based on Simulated Annealing
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A phase signal, simulated annealing technology, applied in the field of signal analysis, can solve problems such as practical operation and operation process of modern optimization algorithms that are not specified in detail
Active Publication Date: 2020-07-17
PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG UNIV
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[0018] However, the existing time-frequency analysis methods are still difficult to fully apply to polynomial phase signals whose phase modulation can be expressed as a finite term polynomial series
[0019] The patent "A Model-Driven Polynomial Phase Signal Adaptive Time-Frequency Transformation Method" proposes a feasible new idea and method for the above-mentioned practical problems, but does not specifically give the specific practicality of various modern optimization algorithms. Operation and Calculation Process
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[0076] The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0077] The present invention first estimates the model order of each component of the polynomial phase signal and the corresponding phase parameters of each order through simulated annealing, then uses the idea of "cleaning" to extract the corresponding polynomial phase signal component, and removes the component of the polynomial phase signal from the original signal. The residual signal is obtained from the signal component, and then simulated annealing is used repeatedly to determine the order of the adaptive model and optimize the optimal model parameters for the residual signal in an iterative “cleaning” manner, and gradually extract each signal component, and so on until the residual signal is The energy of the difference signal is lower than a preset threshold or the number of extracted signal components reaches a preset maximum value. Subsequentl...
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Abstract
The invention provides an adaptive time-frequency transform method of polynomial phase signal on the basis of simulated annealing, and can finish the time-frequency decomposition of the polynomial phase signal. Each signal component obtained by decomposition is a single component which only corresponds to one frequency point at any moment; then, the instantaneous frequency values of each signal component and each moment are used; only a Sinc function responded by a main lobe is retained to directly calculate and generate corresponding signal frequency distribution at a corresponding moment; across term defect in traditional time-frequency transform that one moment corresponds to the non single component of a plurality of frequency points is overcome; and finally, time-frequency distribution with an optimal time-frequency combined resolution ratio without any cross term interference is finally output. The method has the advantages of simple principle and convenience in operation, the adverse effect of the cross term interference and the loss of the time-frequency combined resolution ratio of a classical time frequency analysis method can be overcome, and the time-frequency analysisquality and benefit of a non-stationary polynomial phase signal can be effectively improved.
Description
technical field [0001] The invention belongs to the field of signal analysis, in particular to a polynomial phase signal adaptive time-frequency transformation method based on simulated annealing. Background technique [0002] Many natural and artificial signals, such as speech, biomedical signals, waves propagating in dispersive media, mechanical vibrations, animal sounds, music, radar, sonar signals, etc., are typical non-stationary signals, which are characterized by continuous Time is limited, and the frequency is time-varying, non-stationary, nonlinear, non-uniform, non-structural, non-deterministic, non-integrable, non-reversible, amorphous, irregular, non-continuous, non-smooth, non-periodic, non-smooth symmetrical features. Joint time-frequency analysis (joint time-frequency analysis, referred to as time-frequency analysis) focuses on the time-varying characteristics of real signal components, and expresses a one-dimensional time signal in the form of a two-dimensio...
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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/14G06N7/00G06N20/00
Inventor 尹灿斌劳国超叶伟冉达
Owner PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG UNIV