JPH011995A - active sonar device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an active sonar device, and more particularly to an active sonar device designed to three-dimensionally determine the position of a target to be detected.

[Conventional technology]

Conventionally, this type of active sonar device emits sound waves into the water from a transmitter, captures the reflected sound from a target object with a delivery device, and calculates the distance of the target from the round trip time and the arrival of the reflected sound. The direction is detected from the horizontal direction angle, and the two-dimensional direction and distance are determined.

However, it is well known that the sound ray, which is the locus of sound waves traveling underwater, forms a complicated curved curve depending on oceanographic conditions such as water temperature and water depth, and this condition is necessary to know the true position. In addition, in recent years, the diving depth of submarines targeted by sonar has become deeper, and it has become increasingly necessary to know the depth of the target.

[Problem that the invention seeks to solve]

The conventional active sonar device described above usually does not detect the angle of arrival in the vertical direction, that is, the angle of depression with respect to the target, so the acoustic ray path of the received signal cannot be detected.
Distance measured from the time between transmission and reception is correspondingly inaccurate, and there is also the disadvantage that the depth of the target cannot be determined.

SUMMARY OF THE INVENTION The object of the present invention is to eliminate the above-mentioned drawbacks and to provide an active sonar device that detects the depth as well as the direction and distance of a target, thereby obtaining information that will make the next attack or evasion more effective. be.

[Means for solving problems]

The device of the present invention is installed on a ship, and the distance to the target can be measured from the time from emitting sound waves into the water until receiving the reflected sound from the target, and the position of the target from the arrival angle of the reflected sound. In an active sonar device, a vertical direction detector detects the vertical arrival angle of the reflected sound, and the progress of the reflected sound is determined based on correlation data between water depth and sound speed while receiving the vertical arrival angle and the distance to the target. A sound ray calculator that calculates the sound rays to be detected, and a target position calculator that calculates the position of a target based on the sound rays.

〔Example〕 Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a conceptual diagram for explaining an example of use of the active sonar device according to the embodiment of FIG.

The transducer 5 is driven by the transmitter 4 to emit sound waves into the water, and also receives reflected sound from the target object 20, converts it into an electrical signal, and outputs the electrical signal. This output signal is supplied to the target detection section 6, horizontal direction detection section 7, and vertical direction detection section 8, respectively. The target detection unit 6 detects the target object 2 in FIG. 2 from the difference between the emission time of the sound wave and the reception time of the reflected wave.
The apparent distance iRf by the sound ray 22 to 0 is calculated and supplied to the sound ray calculator 1. The horizontal position detector 7 supplies the horizontal arrival angle of the reflected sound, that is, the horizontal direction angle ψ, to the target position calculator 2. Similarly, the vertical direction detecting section 8 detects the apparent vertical direction arrival angle θ of the target 20 from the arrival angle of the reflected sound and supplies it to the sound ray calculator 1. The sound ray calculator calculates the curvature of the sound ray at that depth by using pre-stored water depth and sound velocity correlation data, the depth of the sonar transducer and the vertical arrival angle θ, and calculates the curvature of the sound ray at that depth. Supply to 2. The target position calculator 20 calculates the true distance Rr to the target object, which is the length of a straight path N21 connecting a point a distance Rf away from the sonar position along the acoustic ray distance 22, that is, the position of the target object 20. The 0 indicator 3, which knows the direct vertical direction angle φ indicated by
A point in the underwater three-dimensional space can be displayed from the horizontal direction angle ψ.

〔Effect of the invention〕

As explained above, according to the present invention, an active sonar device is realized that can accurately grasp the position of a target in three dimensions by being equipped with a means for detecting depth in addition to the direction and distance of the target. There is an effect that it can be done.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention.
FIG. 3 is a conceptual diagram for explaining an example of use of the embodiment shown in the figure. 1...Hot spring calculator, 2...Target position calculator, 3...
・Display device, 4... transmitter, 5... transducer, 6...
- Meguro detection section, 7... Horizontal direction detection section, 8... Vertical direction detection section, 10... Sonar device, 20... Target object, 21... Straight line distance, 22... Sound ray .

Claims (1)

[Claims] The distance to the target that can be measured from the time from when a ship is equipped with a ship and emits a sound wave into the water until the reflected sound from the target is received, and the position of the target based on the arrival angle of the reflected sound. An active sonar device that uses a vertical direction detector to detect the vertical arrival angle of reflected sound, and a vertical direction detector that detects the vertical arrival angle and the distance to the target object and detects the progress of the reflected sound from correlation data between water depth and sound speed. 1. An active sonar device comprising: a sound ray calculator for calculating sound rays; and a target position calculator for calculating the position of a target based on the sound rays.