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Method for measuring phase difference between parametric array difference-frequency wave and same-frequency small-amplitude wave signal

A parametric array and signal technology, used in the measurement of ultrasonic/sonic/infrasonic waves, measurement devices, radio wave measurement systems, etc., can solve problems such as phase change differences, and achieve the effect of simple processing methods

Active Publication Date: 2014-09-24
HARBIN ENG UNIV
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Problems solved by technology

Therefore, the phase change of the parametric array difference frequency sound wave and the same frequency small amplitude wave in the seawater will be different during the propagation process.

Method used

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  • Method for measuring phase difference between parametric array difference-frequency wave and same-frequency small-amplitude wave signal
  • Method for measuring phase difference between parametric array difference-frequency wave and same-frequency small-amplitude wave signal
  • Method for measuring phase difference between parametric array difference-frequency wave and same-frequency small-amplitude wave signal

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Embodiment

[0036] first step, combine figure 1 , the trigger signal generator generates two trigger signals with an interval of Δt=1.05s, the difference frequency wave signal emitted by the parametric array sound source 1 and the signal emitted by the small amplitude wave sound source 2 are both 10Hz, and the pulse width of the emitted signal is 0.7s.

[0037] In the second step, combine as figure 2 , the difference frequency wave pulse signals received by the hydrophone 3 and the hydrophone 4 are 5 and 6 respectively, and the sampling frequency of the received signal is 1000 Hz. Here, it is set that the phase difference between the parametric array difference frequency wave and the same-frequency small-amplitude wave signal propagating within the distance between the hydrophone 3 and the hydrophone 4 is 39 degrees.

[0038] Step three, combine image 3 , intercept the first pulse signal in the received signal 5 of the hydrophone 3; combine Figure 4 , correlate the intercepted pulse...

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Abstract

The invention pertains to the field of underwater acoustic measurement, and specifically relates to a method for measuring the phase difference between a parametric array difference-frequency wave and a same-frequency small-amplitude wave signal. The method of the invention comprises the following steps: a parametric array sound source, a small-amplitude wave sound source, a first hydrophone and a second hydrophone are hung in the water, and two trigger signal are generated by a trigger signal generator; signals are transmitted by the parametric array sound source and the small-amplitude wave sound source separately after a time interval of delta t, and signals received by the first hydrophone and the second hydrophone are acquired and stored by an acquiring device; correlated processes are performed to find out the correlation peak in the processing result; and the phase difference between the parametric array difference-frequency wave and the same-frequency small-amplitude wave signal is obtained. According to the invention, the measured data processing method is simple, and no complex signal processing algorithm is needed.

Description

technical field [0001] The invention belongs to the field of underwater acoustic measurement, and in particular relates to a method for measuring the phase difference between a parameter array difference frequency wave and a same-frequency small-amplitude wave signal. Background technique [0002] Parametric arrays are widely used in many aspects such as underwater acoustic positioning, underwater acoustic navigation, underwater communication, and underwater detection. The parametric array utilizes the nonlinear effect of the medium, emits two high-intensity sound waves (primary waves) with similar frequencies from the sound source, and generates the required difference frequency sound waves in the interaction area. The propagation law of the difference-frequency sound wave of parametric array depends on the medium parameters at the original wave frequency, while the seawater medium usually contains air bubbles and tiny sand particles, etc., and its acoustic parameters are a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/536
CPCG01H17/00G01S7/52004
Inventor 陈文剑孙辉张明辉朱广平
Owner HARBIN ENG UNIV
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