JP2897469B2 - Underwater azimuth distance measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underwater azimuth distance measuring device, and more particularly to an underwater azimuth distance measuring device mounted on a submarine for receiving sound from a target (such as a ship) and measuring the target azimuth distance.

[0002]

2. Description of the Related Art Conventionally, this type of underwater azimuth distance measuring apparatus is directly equipped with an active array for transmitting an acoustic beam to a submarine hull and a passive array for receiving an acoustic beam, or a stern having a length of about 1000 to 3000 m. Now tow the towed array. Echo or radiated sound from the target is received via these arrays, and the azimuth distance of the target is measured.

[0003]

The above-described conventional underwater azimuth distance measuring apparatus has an acoustic transmission / reception system directly mounted on a submarine.
Alternatively, since transmission / reception is performed by towing, there is a possibility that the other party may detect the transmission / reception in reverse. Another problem is that information can only be collected around the ship itself. Especially for submarines, running around the target sea area at high speed for information gathering also gives up their tightness.

[0004] It is an object of the present invention to provide an underwater azimuth distance measuring apparatus capable of greatly reducing the possibility of being detected by a partner and collecting acoustic information in a remote sea area.

[0005]

An underwater azimuth distance measuring apparatus according to the present invention comprises: a housing which is held in water at a predetermined depth by the buoyancy of a float; receives a sound from a target provided in the housing; , An accelerometer mounted on the housing to detect acceleration in the X, Y, and Z-axis directions, and detecting a geographical movement amount of the housing from the acceleration detected by the accelerometer. A movement amount detection unit that outputs movement amount information, a signal cable that transmits the acoustic signal and the movement amount information from the housing to the ship, and receives the acoustic signal mounted on the ship and determines the azimuth and distance of the target. An azimuth distance measuring unit to be measured and a position calculating unit mounted on the ship and receiving the movement amount information and calculating a geographical position of the housing are configured.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. The underwater housing 1 is an acoustically transparent housing that is held in water at a predetermined depth by the buoyancy of the float 4. On the underwater housing 1 side, a three-dimensional array 11 composed of a plurality of receivers for receiving sound, and an acoustic signal input unit 12 for taking in acoustic signals from the plurality of receivers and transmitting them as acoustic signals Ss
And an accelerometer 13 for detecting accelerations in the three axial directions of X, Y, and Z, respectively, and a movement amount detection unit 14 for detecting a movement amount from the detected acceleration and transmitting it as movement amount information Sp. .

The underwater housing 1 and the submarine 2 are connected by a signal cable 3. On the submarine 2 side, a cable dispenser 21 that feeds out the signal cable 3, and an acoustic signal Ss and a moving amount via the signal cable 3. Information S
p, a position calculator 23 that calculates the geographical position of the underwater housing 1 from the movement amount information Sp, and an azimuth distance measuring unit 24 that processes the acoustic signal Ss to detect the target azimuth and distance. And a display unit 2 for displaying a target direction, a distance, and the like.
5 is provided.

Here, as shown in FIG. 2, in the three-dimensional array 11, a plurality of non-directional receivers are arranged on an array cable which is three-dimensionally extended underwater by an extension arm.

Next, the operation will be described.

When the underwater housing 1 is installed, the underwater housing 1 is ejected from a torpedo launching tube or a signal launching tube of a submarine. After being ejected, the underwater housing 1 releases the float 4 to hold the underwater housing 1 at a predetermined depth in the water and expand the three-dimensional array 11. On the other hand, the submarine 2 feeds out the signal cable 3 without giving tension to the underwater housing 1 from the cable dispenser 21 after injecting the underwater housing 1. In this way, the underwater housing 1 is installed in a sea area away from the submarine, for example, by one convergence zone (about 35 to 40 nautical miles).

By the way, the geographical position of the underwater housing 1 is moved by a tidal current, wind force, or the like. In order to detect such an amount of movement, an accelerometer 13 provided in the underwater housing 1 is provided with X,
The acceleration in the three axis directions of Y and Z is detected,
Detects the movement amount from the acceleration and sends it out as movement amount information Sp. The movement amount information Sp is transmitted to the submarine 2 via the signal cable 3. The acoustic signals from the plurality of receivers arranged in the three-dimensional array 11 are transmitted to the acoustic signal input unit 1.
2 and transmitted to the submarine 2 via the signal cable 3 as an acoustic signal Ss.

On the submarine 2 side, the receiving unit 22 receives the acoustic signal Ss and the movement amount information Sp, and the position calculating unit 23 calculates the geographical position of the underwater housing from the movement amount information Sp.
The azimuth distance measuring unit 24 detects the target azimuth and distance from the sound signal Ss. In this case, by processing acoustic signals from a plurality of three-dimensionally arranged receivers, it is possible to easily detect the direction of the target, analyze the change in the direction of the target, and perform statistical processing and Kalman filter processing. The distance can be easily calculated by the above method. The display unit 25 displays the measured azimuth and distance of the target, the geographical position of the underwater housing 1, and the like.

[0014]

As described above, according to the present invention, a receiver that outputs an acoustic signal from a target to a housing that is held in water at a predetermined depth by the buoyancy of a float, and a housing that detects acceleration is provided. A moving amount detecting unit that outputs the geographical moving amount information of the target, the sound signal and the moving amount information are transmitted to the ship via a signal cable, the sound signal and the moving amount information are received on the ship side, and the target By detecting the azimuth distance and the geographical position of the housing, azimuth distance information of a target in a remote sea area can be collected in real time while avoiding being detected by the other ship.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a perspective view showing an example of a three-dimensional array 11 shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Underwater housing 2 Submarine 3 Signal cable 4 Float 11 Three-dimensional array 12 Sound signal input unit 13 Accelerometer 14 Movement detection unit 23 Position calculation unit 24 Azimuth distance measurement unit Ss Sound signal Sp Movement information

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01S 3/80-3/86 G01S 5/18-5/30 G01S 7/52-7/64 G01S 15 / 00-15/96 G01C 21/20 H04B 3/02

Claims (1)

(57) [Claims] 1. A housing that is held in water at a predetermined depth by the buoyancy of a float, a receiver that is provided in the housing, receives sound from a target, and outputs an acoustic signal, and is mounted on the housing. An accelerometer that detects acceleration in the X, Y, and Z axis directions;
A displacement detector that detects the geographic displacement of the casing from the acceleration detected by the accelerometer and outputs displacement information, and a signal cable that transmits the acoustic signal and the displacement information from the casing to the ship. An azimuth distance measurement unit mounted on the ship and receiving the acoustic signal to measure the azimuth and distance of the target; and a position mounted on the ship and receiving the movement amount information and calculating the geographical position of the housing. An underwater azimuth distance measuring device, comprising: a calculation unit.