Amplitude and phase correction device and method suitable for three-dimensional camera sonar array signal receiver

Abstract

The invention discloses an amplitude and phase correction device and method suitable for a three-dimensional camera sonar array signal receiver. The device mainly comprises a signal source, an analogreceiving module, a signal acquisition and storage module and a signal processing module. The device is characterized in that when amplitude and phase correction is carried out on the three-dimensional camera sonar array signal receiver, the signal source simultaneously inputs in-phase signals with the same amplitude and the frequency being the sonar working frequency in all channels of the analogreceiving module; the analog receiving module carries out low-noise amplification, time gain control and band-pass filtering processing on the signals and outputs the signals to the signal acquisition and storage module; the signal acquisition and storage module carries out A / D sampling, converts the signals into digital signals and stores the digital signals in sampling data; and the signal processing module reads the sampling data, carries out complex demodulation and digital low-pass filtering, obtains amplitude differences between different receiving channels and reference channels by calculating effective values of all channel data, obtains phase differences between all the channels and the reference channels through a complex cross-correlation algorithm, and compensates the amplitude and phase differences.

Description

Technical field [0001] The invention belongs to the field of sonar array signal processing, and specifically relates to a method for correcting the amplitude and phase consistency of a sonar array signal receiver. Background technique [0002] The three-dimensional imaging sonar uses a rectangular array containing thousands of elements arranged at equal intervals to receive echo signals, and obtains high-resolution underwater three-dimensional images through frequency domain beamforming algorithms and real-time image processing technology. The frequency domain beamforming algorithm uses uniform weights, and performs fast Fourier transform on the time domain signals of each array element, and extracts the same frequency components for phase compensation. However, due to the accuracy of the selected passive components, the performance difference of the active components, the asymmetry of the layout and wiring of the printed board, etc., the amplitude and phase of each channel of th...

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Problems solved by technology

However, due to the accuracy of the selected passive components, the performance difference of the active components, and the asymmetry of the printed board layout and wiring, the amplitude and phase of each channel of the receiver are inconsistent, so that the amplitude weight of each channel in the frequency domain beamforming process If the value and phase compensation value deviate from the theoretical design value, it may cause problems such as increased side lobe, decreased main lobe gain, and beam pointing deviation, which will reduce the imaging quality of the system and affect the identification and observation of underwater targets.

[0003] There are few researches on the amplitude and phase correction method of the receiver of the three-dimensional camera sonar array signal. For reference, the receiver amplitude and phase correction method in the field of phased radar is used to correct the phase by using two orthogonal signals of the reference channel to maximize the output The value is used as the amplitude for amplitude correction. When the phase error is close to the integer multiple of π / 2, the measurement error introduced is relatively large. Due to circuit noise interference, there is disturbance in the maximum output value, and the amplitude correction accuracy is low.

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