The research results can be applied to the passive sonar target recognition.

研究结果可以用于被动声呐目标识别。

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The traditional method of Kalman filter for passive sonar target track association is limited in practice.

传统的目标航迹关联方法卡尔曼滤波法在实际应用时有局限性。

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Feature extraction of targets radiated-noise is the key technique of passive sonar target recognition system.

目标噪声特征提取是被动声纳目标识别系统的关键技术。

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Like its cousins radar and sonar, lidar (light detection and ranging), works by broadcasting electromagnetic waves towards a target and then building up a picture from the reflection.

ECONOMIST: Forest conservation