Novel method for measuring underwater acoustic array member phase-and-amplitude consistency
A consistent and phase-amplitude technology, applied in the basic research field of underwater acoustic technology, can solve problems such as low efficiency, influence, and susceptibility to positioning deviation measurement accuracy, and achieve the effect of eliminating measurement deviation and measurement error
Active Publication Date: 2012-05-23
THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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[0004] The technical problem to be solved by the present invention is to provide a method for measuring the phase-amplitude consistency of the underwater acoustic array elements, mainly to solve the problem of the original pulse sound in the measurement of the consistency between the amplitude and phase of the sonar array elements in the underwater acoustic reverberation field. The efficiency of the method is not high, and it is susceptible to the influence of positioning deviation and uneven sound field conditions on the measurement accuracy
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[0023] Below in conjunction with specific embodiment and accompanying drawing, the present invention will be further described:
[0024] The design concept of the present invention: when actually measuring the phase-amplitude consistency of the array element, the amplitude measurement is relatively easy to realize. The phase between array elements is more easily affected by external conditions. Absolute phase is meaningless for an acoustic array, and general phase measurements refer to relative phase measurements. When measuring, the measured objects are in groups of two. Due to the positioning device, sometimes it is easy to cause inconsistency in the distance between the two array elements and the distance between the transmitters, thus introducing additional errors in the measurement of the phase difference between the two array elements. Although this error can be corrected by measuring the distance deviation, it is difficult to eliminate the sound field difference cause...
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The invention belongs to the field of hydroacoustic technological base, and in particular relates to a method for measuring the phase and amplitude consistency of array elements of a hydroacoustic array, which comprises the following steps: the measurement of the amplitudes and phases of the array elements of the hydroacoustic array by using time delay spectrometry for obtaining an amplitude and a phase for transmitting functions between two measured array elements A and B; a place-exchange measurement process which controls the position exchange between the two measure array elements Aand B through the control of a computer over a coordinate setting and swinging mechanism and repeats the step (1) in the same way to obtain an amplitude and an phase for transmitting functions between the two measured array elements A and B after the place exchange between the array elements A and B; and data processing, in which the amplitude and phase deviations between the two measured array elements at a frequency point needing to be measured are obtained according to the amplitudes and phases, obtained in the two times of measurement, of the receiving array elements. The method has the advantages of solving the problem that the prior method for measuring the phase and amplitude consistency of array elements of a sonar array in a hydroacoustic reverberation field is low in efficiency and is easily influenced by conditions such as positioning deviation and uneven sound field on the measurement precision.
Description
technical field [0001] The invention belongs to the field of basic research of underwater acoustic technology, and mainly relates to a method for measuring phase amplitude consistency of underwater acoustic array elements. Background technique [0002] Usually, the calibration of the phase-amplitude consistency between the elements of the underwater acoustic sonar array is measured in a free field by using a single-frequency continuous signal or a single-frequency pulse signal, using the reference signal comparison method or FFT signal processing method. Among them, the pulse acoustic signal method can also be used in non-anechoic limited waters. In addition, under the condition of the sound field where the influence of the reflected wave cannot be ignored, the frequency-sweeping continuous wave signal can also be used, and the phase difference between the measured signal and the reference signal can be read directly with the frequency-sweeping phase detector. These methods...
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IPC IPC(8): G01S7/52
Inventor 平自红赵涵
Owner THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP