Pool near-field double-hydrophone phase difference calibration and measurement system and phase difference calibration and measurement method thereof
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A dual-hydrophone, calibration and measurement technology, applied to devices with phase adjustment/time lag error compensation, direction finders using ultrasonic/sonic/infrasonic waves, etc. problem, to achieve the effect of eliminating the large phase difference measurement error
Pending Publication Date: 2020-01-17
HARBIN ENG UNIV
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[0004] The purpose of the present invention is to solve the problem that the position error has a great influence on the phase difference calibration of dual hydrophones under the existing low-frequ
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specific Embodiment approach 1
[0044] Specific implementation mode one: the following combination figure 1 and figure 2 Describe this embodiment, the dual hydrophone phase difference calibration measurement system in the near field of the pool described in this embodiment, the measurement system includes a low-frequency sound source emission system 1, a dual hydrophone receiving system 2 and a bracket 3;
[0045] The low-frequency sound source emission system 1 includes a low-frequency emission transducer 11, a power amplifier 12 and a signal source 13;
[0046] The dual hydrophone receiving system 2 includes two hydrophones 21, two signal conditioning circuits 22 and a dual-channel data collector 23;
[0047] The low-frequency transmitting transducer 11 is rigidly installed in the middle of the bracket 3, and two hydrophones 21 are rigidly installed at the two ends of the bracket 3 respectively,
[0048] The signal transmitted by the signal source 13 is provided to the low-frequency transmitting transdu...
specific Embodiment approach 2
[0062] Specific embodiment two: the phase difference calibration measurement method of the dual hydrophone phase difference calibration measurement system based on the near field of the pool described in this embodiment, the specific process of the measurement method is:
[0063] S1, the low-frequency transmitting transducer 11 and two hydrophones 21 are installed on the support 3;
[0064] S2, two hydrophones 21 receive the chirp signal transmitted by the low-frequency transmitting transducer 11, and convert it into an electrical signal;
[0065]S3. The signal conditioning circuit 22 filters and amplifies the electrical signal obtained by S2, and the dual-channel data collector 23 collects the two-way data synchronously;
[0066] S4, the collected two-way data adopts the periodogram method to obtain the cross-power spectrum;
[0067] S5. Obtain the argument angle according to the cross power spectrum, and the argument angle is the phase of each frequency point corresponding ...
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Abstract
The invention discloses a pool near-field double-hydrophone phase difference calibration and measurement system and a phase difference calibration and measurement method thereof, belongs to the technical field of underwater acoustic measurement, and aims to solve the problem that the position error has a great influence on the double-hydrophone phase difference calibration under a low-frequency near-field condition at present. The method comprises the following steps: rigidly mounting a low-frequency transmitting transducer in the middle of a bracket, rigidly mounting two hydrophones at the two ends of the bracket respectively, supplying a signal transmitted by a signal source to the low-frequency transmitting transducer through a power amplifier, and synchronously acquiring two paths of data through a dual-channel data acquisition unit; carrying out data processing on the acquired two paths of data to obtain the phase of each frequency point; solving the average value after multiple measurements, and acquiring the phase difference between the signals of two channels where the two hydrophones are positioned; and interchanging the two hydrophones, acquiring the phase difference between the signals of two channels where the two interchanged hydrophones are positioned, and solving the average value of the two phase differences to obtain the phase difference needing to be measuredby the measurement system. The phase difference calibration and measurement system and method are applied to phase difference measurement under a low-frequency near-field condition.
Description
technical field [0001] The invention relates to a dual hydrophone phase difference calibration measurement system in the near field of a pool and a phase difference calibration measurement method thereof, belonging to the technical field of underwater acoustic measurement. Background technique [0002] The phase error between channels is an important factor affecting the signal processing of the array. The phase error consists of two parts, one is the phase difference caused by the circuit system between the channels, and the other is the phase difference caused by the hydrophone itself. The phase difference caused by the circuit system between channels can be measured using electrical signals. The phase difference between the hydrophones needs to be calibrated by measuring with the sound source. [0003] For low-frequency signals, it is difficult to meet the far-field conditions in a pool of limited size, mainly because the position error of the acoustic center of the hyd...
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