Digital delay system for sonar system test and realization method thereof

Abstract

The invention discloses a digital delay system for sonar system test and a realization method thereof. The system comprises a first delay unit, a synchronization unit and a second delay unit. The method comprises steps: according to a first delay value, original signal waveform data are converted into signal waveform data with delay of a corresponding number of clocks through the first delay unit;the synchronization unit samples a D / A clock and the signal waveform data after conversion through a high-frequency clock, and the high-frequency clock and a sampling result are subjected to synchronization processing; and according to a second delay value, the second delay unit carries out delay processing on the synchronization processing result. In comparison with the existing method of carrying out digital delay through only one delay unit, two delay units are adopted for two-stage delay, while the delay amount and the delay precision are ensured, the demand for hardware resources is alsoreduced, the cost is low, and the system and the method can be widely applied to the technical field of sonar system test.

Description

technical field [0001] The invention relates to the technical field of sonar system testing, in particular to a digital delay system used for sonar system testing and an implementation method thereof. Background technique [0002] The sonar or torpedo emits the acoustic pulse signal in the self-guiding seawater, and then receives the reflected echo of the target, and obtains the target's azimuth, speed and other parameters by processing the echo. The control of the transmitting and receiving azimuth is realized by transmitting or receiving the phase of the signal on the transducer matrix. When testing sonar and torpedo sound self-guidance, it is necessary to simulate the orientation of the target, so it is necessary to simulate the position of the transducer matrix. The phase difference of each array element when receiving target signals from different azimuths, that is, there is a certain relative delay between the array element signals. [0003] Domestic and foreign test ...

AI Technical Summary

Problems solved by technology

[0005] However, the existing digital delay circuits generally only use one delay unit, and the maximum delay value that can be set by this digital delay module determines its demand for hardware resources, for example: when the delay accuracy is high , the frequency of the input clock must be increased, and in order to ensure the maximum amount of delay, the number of delay units in the delay module must also be increased, thereby increasing the demand for system hardware resources

To sum up, the existing digital delay methods have high requirements on hardware resources, especially when the delay accuracy is high and there are many channels, the required resources are higher, which brings higher component costs

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