1. For ASW operations, she uses Chinese SJD-3 telescoping high frequency active sonar . 2. With the development of active sonar , depth control became even more complex. 3. Active sonar emits an acoustic signal, or pulse of sound, into the water.4. Consequently, active sonar is normally considered a backup to passive sonar. 5. In 2013, research showed beaked whales were highly sensitive to mid-frequency active sonar . 6. In active sonar there are two performance limitations, due to noise and reverberation. 7. Active sonar searches use a sound wave to detect the hulls of surface vessels.8. Active sonar can also be used as a deterrent and / or disablement mechanism.9. Echolocation is the same as active sonar , using sounds made by the animal itself. 10. This is a sonar designed to detect and locate the transmissions from hostile active sonars .
