Weak signal detection method based on double-coupling Duffing vibrators and scale varying
A weak signal detection, double-coupling technology, applied in special data processing applications, instruments, electrical digital data processing and other directions, to achieve the effect of detection, high sensitivity and good work stability
Inactive Publication Date: 2015-03-25
YANSHAN UNIV
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[0005] There is a defect in the conventional detection method based on the Duffing oscillator, that is, the system is limited by small frequency parameters and can only detect weak signals of lower frequencies
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[0042] The present invention will be further described in detail below with reference to the drawings and specific embodiments.
[0043] The weak signal detection method combining dual coupling Duffing vibrator and variable scale according to the embodiment of the present invention is as follows: figure 1 As shown, its content includes the following steps:
[0044] Step S1. First, construct the weak signal detection system equation of the dual-coupled Duffing oscillator, and observe the phase trajectory diagram and time domain waveform diagram of each state of the system:
[0045] (a) The weak signal detection system equation of the double coupled Duffing oscillator is:
[0046] x · · + k x · - x 3 + x 5 + m ( x - y ) = F cos ( t ) y · · + k y · - x 3 + x 5 + m ( y - x ) = F cos ( t ) - - - ( 1 )
[0047] (b) Set the parameters...
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The invention discloses a weak signal detection method based on double-coupling Duffing vibrators and scale varying. The weak signal detection method comprises the following steps of (1) constructing a double-coupling Duffing vibrator weak signal detection system equation, analyzing various states of a system and confirming a critical chaos state parameter; (2) establishing a double-coupling Duffing vibrator array detecting model and setting an equation parameter; (3) analyzing frequency spectra of signals to be detected to obtain an estimated value of frequency of the signals to be detected; (4) varying the scale of the signals to be detected so as to ensure that the signals are in a detection range of a vibrator array; and (5) inputting the signals to be detected in the double-coupling Duffing vibrator array after the scale of the signals is varied and calculating accurate frequency configuration of the signals to be detected. Weak periodic signals can be detected on the basis of the double-coupling Duffing vibrator system and scale varying, the shortcoming that the conventional Duffing vibrator system only can detect low-frequency signals is overcome, and high-frequency weak signals can be detected.
Description
Technical field [0001] The invention relates to the technical field of weak signal detection, in particular to a weak signal detection method combining a dual-coupled Duffing vibrator and a variable scale. technical background [0002] Signal detection technology has a wide range of applications in the engineering field. Weak signals are weak quantities that cannot be detected by conventional methods, such as weak light, weak sound, and micro current. Weak signal detection is used in radar, sonar, vibration measurement, and fault diagnosis. , Communication and other fields have extremely wide applications, so the detection of weak signals has always been a hot spot for scholars at home and abroad. The traditional weak signal detection method is mainly to filter or suppress noise, but this method may damage the useful signal. [0003] The use of chaotic oscillators to detect weak signals has the advantages of high sensitivity and strong anti-noise ability. This method is more and m...
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IPC IPC(8): G06F17/50
Inventor 时培明孙彦龙韩东颖
Owner YANSHAN UNIV