Measuring method for target echo strength

Abstract

The invention aims to provide a measuring method for target echo strength. The measuring method includes that a transponder is arranged on a target, and a transceiving transducer is arranged on a measuring terminal; the measuring terminal sends broadband measuring signals to the target; the measuring terminal receives echo signals of the target and the transponder and stores the echo signals after sound waves are transmitted to the target and then returned to the measuring terminal; time reversal processing of echoes is performed to the ith transponder, and broadband signals are added at the front ends of the signals to be finally sent to the target; the received signals and the sent signals are convoluted after the echoes are received to measure a peak value Pi of the ith transponder; and the steps are respectively repeated to other transponders rather than the ith transponder, the echoes of the transponders are changed into the echoes of the target, the peak value of the target echoes is measured, and target strength is finally figured out. By the method, numerous interferences and measuring errors during measuring are reduced, and measuring accuracy of the target strength is improved.

Description

technical field [0001] The invention relates to an underwater target measurement method. Background technique [0002] The accurate target strength value of a target is of great significance to the design of the detection system, target detection, identification and tracking. Many target properties can be captured by target strength. It is of great significance to study the law of the target reflection intensity changing with the azimuth angle. For the design of self-guided systems, the significance of knowing the minimum reflection intensity is to have a certain operating distance under the most unfavorable conditions. The effect of target stealth technology treatment also needs to be tested by using the change of target intensity before and after treatment. [0003] The measurement of the target strength is generated by the interaction of the incident sound wave and the target. Due to the complexity of underwater measurement, the target strength is easily affected by th...

AI Technical Summary

Problems solved by technology

Conventional methods require accurate estimates of propagation loss, so even with propagation tests in the field, the method suffers from low accuracy due to propagation fluctuations

The scale model method uses light and ultrasonic reflection research, and then converts the measurement results to the real ship. This indirect measurement method verifies the theoretical research results of the target reflection characteristics to a certain extent. Reflective properties have played a positive role, but there is still a large gap compared with the actual measurement of complex targets

The "response method" measures by placing transponders and hydrophones on the target, and the measurement accuracy is relatively good. However, after experimental research, it is found that the actual accuracy is still limited, with large fluctuations, and cannot meet actual needs.

Images