基于脉冲幅度起伏频率的体目标与点源合成目标回波分辨

Discrimination between the real underwater target echo and the synthetic point-source echo based on the echo amplitude fluctuation frequency

针对水中体目标回波与点源合成目标回波分辨问题,研究了体目标和常规点源合成目标回波脉冲幅度起伏频率特性。基于目标回波亮点模型,理论分析证明了体目标回波脉冲幅度起伏频率具有随载波频率相关的变化特性,而常规点源合成目标回波的脉冲幅度起伏频率不具有相应特性,据此提出并研究了基于脉冲幅度起伏频率的体目标回波与点源合成目标回波分辨的方法。海上试验对Benchmark模型回波与两个点声源合成的模拟回波进行对比,试验结果表明:通过主动发射两个频率差别明显的载频信号,基于接收回波的脉冲幅度起伏峰值频率对比,可以对体目标回波与合成回波进行分辨,验证了基于脉冲幅度起伏频率的体目标回波与点源合成目标回波分辨方法的可行性。

How to discriminate between the real underwater target echo and the synthetic echo is a key problem in identifying the underwater target. In this study, we analyze the echo amplitude fluctuation frequency of the real underwater target echo and the synthetic target echo of conventional point sources. The theoretical research based on the echo highlight model shows that the amplitude fluctuation frequency of the real target echo increases when the carrier frequency increases. However, the amplitude fluctuation frequency of the synthetic target echo does not have such a feature. A method of discriminating between the real target echo and the synthetic echo based on the echo amplitude fluctuation frequency is put forward herein. A sea test is conducted to compare the Benchmark model echo and the simulative echo synthesized by two？point sound sources. The test results show that by actively transmitting two signals with apparently different frequencies, the real target echo and the synthetic echo can be discriminated based on the contrast of the amplitude fluctuation peak frequencies of the received echo. The result verifies the feasibility of the method for discriminating between the real target echo and the echo of the point-source synthesized target based on the pulse amplitude fluctuation frequency.