Bistatic azimuth detection system and detection method

A bistatic azimuth detection system comprising:

• sound source equipment which transmits a sound wave to a target in the sea and transmits first position information on the equipment;
• wave receiving equipment which transmits second position information on the wave receiving equipment with a received wave signal which is obtained by receiving a direct wave from the sound source equipment and a reflective sound from the target, and specific azimuth information on a specific azimuth obtained by a compass;
• first sound source azimuth detection means which detects an azimuth of the sound source equipment to a specific azimuth in the wave receiving equipment on the basis of the first and second position information;
• second sound source azimuth detection means which detects an arrival azimuth of the direct wave to the specific azimuth in the specific azimuth information on the basis of the received wave signal and the specific azimuth information;
• target azimuth detection means which detects a target azimuth, which is an arrival azimuth of the reflective sound, to the specific azimuth in the specific azimuth information on the basis of the received wave signal and the specific azimuth information;
• and
• azimuth correction means which corrects the target azimuth with the difference between the azimuth detected by the first detection means and the azimuth detected by the second detection means.

A bistatic azimuth detection method of a bistatic azimuth detection system which includes sound source equipment, which transmits a sound wave to a target in the sea and transmits first position information on the equipment, and wave receiving equipment, which transmits second position information on the wave receiving equipment with a received wave signal which is obtained by receiving a direct wave from the sound source equipment and a reflective sound from the target, comprising:

• a first step of detecting an azimuth of the sound source equipment viewed from the wave receiving equipment on the basis of the first and second position information;
• a second step of detecting a sound source arrival azimuth, which is an arrival azimuth of the direct wave from the sound source equipment, and a target arrival azimuth, which is an arrival azimuth of the reflective sound from the target, on the basis of the received wave signal to calculate difference between them;
• and
• a third step of detecting an azimuth of the target on the basis of the azimuth detected at the first step, and the difference calculated at the second step.

A bistatic azimuth detection method of a bistatic azimuth detection system which includes sound source equipment which transmits a sound wave to the target in the sea and transmits first position information on the equipment, and wave receiving equipment which transmits second position information on the wave receiving equipment with a received wave signal which is obtained by receiving a direct wave from the sound source equipment and a reflective sound from the target, and specific azimuth information on a specific azimuth obtained by a compass, comprising:

• a first step of detecting an azimuth of the sound source equipment to a specific azimuth in the wave receiving equipment on the basis of the first and second position information;
• a second step of detecting an arrival azimuth of the direct wave to the specific azimuth in the specific azimuth information on the basis of the received wave signal and the specific azimuth information;
• a third step of detecting a target azimuth, which is an arrival azimuth of the reflective sound, to the specific azimuth in the specific azimuth information on the basis of the received wave signal and the specific azimuth information;
• and
• a fourth step of correcting the target azimuth with difference between the azimuth detected at the first step and the azimuth detected at the second step.