JP2516754B2 - Sonobui - Google Patents

Description

TECHNICAL FIELD The present invention relates to a sonobuoy for detecting a ship such as a submarine.

(Prior Art) A buoy, which is conventionally called a sonobuoy and equipped with a sound source detection device and a wireless device, is floated above the sea, and the presence or absence of a submarine or the like and its position are detected by collecting and analyzing sound signals in a predetermined sea area. There is something.

Conventional sonobuoys are usually dropped from an aircraft to a desired sea area, and radio waves emitted from the buoy are generally analyzed by a receiver and a signal processing device mounted on the aircraft.

However, because the conventional sonobuoy was a method that the transmitter was activated immediately after landing on the surface of the sea and the radio wave was emitted regardless of the presence of the target sound source, it is difficult to operate for a long time by one sonobuoy because of the power capacity. , I was forced to respond by dropping many buoys one after another.

(Object of the Invention) The present invention has been made in view of the problems of the conventional sonobuoy as described above, and is intended to withstand long-term operation even if a relatively small capacity power source is used. The purpose is to provide sonobuoy.

(Outline of the Invention) In order to achieve this object, the present invention has the following configurations.

That is, a sound signal analyzing device is provided in addition to the underwater microphone and the transmitting device, and the feature of the signal obtained from the microphone is extracted by the sound signal analyzing device, and this is compared with the signal stored in advance and both are compared. Only when they match, the transmitter is driven to transmit the required signal.

Note that the number of signals stored for comparison is not limited to one, and there may be a plurality of signals. Further, these stored signals may represent, for example, the characteristics of the sound spectrum of various submarines that are known in advance.

Hereinafter, the present invention will be described in detail based on illustrated embodiments.

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

In the figure, reference numeral 1 is a microphone, and a sound signal picked up by the microphone 1 is input to the analyzer 2.

In this analyzer, the frequency spectrum distribution of the signal from the microphone 1 and the level at each frequency are extracted, digitally processed, and then compared with the data stored in the storage device 3.

The sound spectrum of a known number of various submarines is stored in the storage device after being converted into a digital signal in advance. As a result of the comparison, if the signal picked up from the microphone 1 matches any one of the stored signals, the transmitter 4 is driven, and the signal detected by the microphone 1 indicates which type of submarine or the microphone 1
From the antenna 5, a radio wave obtained by superimposing data such as how far the distance is from the input level to the antenna 5 is transmitted.

The radio wave transmitted in this manner is received by the receiving device 6 installed on an aircraft flying above the ground or on the ground or a ship, and it is known that an object emitting a sound source to be detected, that is, a submarine exists near the sonobuoy. be able to.

When receiving radio waves from this buoy on the ground, provide multiple ground reception points and calculate the position of the buoy from the direction of arrival of radio waves from the buoy measured at each point, or use a communication satellite. If a means such as position detection is also used, it is possible to operate the aircraft or ship at all times without operating it.

In this case, if the buoy or the frequency of the emitted radio wave is in the HF band (0.3MHz to 3MHz band), which allows ionospheric propagation, it will be possible to operate at a long distance.

In the above explanation, the case of identifying the type of submarine in Sonobui was illustrated, but for this purpose, a relatively complicated and expensive analyzer is required. In that case, instead of identifying the type of the submarine, only the screw sound or the like is identified, and when the screw sound is detected, the picked-up signal is as it is, or after some signal processing is performed. It may be configured such that it is transmitted as a modulated signal of the transmitter and detailed analysis is performed on the receiving side.

In this way, both the analysis device 2 and the storage device 3 will be simple.

It should be noted that each of the individual devices required for carrying out the present invention can be realized by the existing technology, and therefore description thereof will be omitted.

Further, it is obvious that various modifications other than those described above are possible, and it can be easily understood that the application range of the present invention can be widely applied not only to ships such as submarines.

(Effects of the Invention) As described above, according to the sonobuoy according to the present invention, the transmitter is activated only when the presence of the sound source to be detected is detected. Is effective in enabling

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention. 1 ... Microphone, 2 ... Analysis device, 3 ... Storage device, 4 ...
… Transmitting device, 5 …… antenna, 6 …… Reception device.

Claims (2)

(57) [Claims] 1. A buoy suspended or suspended on the surface of the sea, comprising at least an underwater microphone, a device for analyzing a signal obtained from the microphone, and a wireless transmission device, and the wireless when the analysis result is a predetermined one. A sonobuoy characterized in that a transmitter is activated to transmit that a predetermined sound source is approaching or collected data. 2. When the sound source is a submarine or a ship, the buoy is equipped with a device in which the feature of the sound source is stored in advance, and the feature is compared with the signal obtained from the microphone, and the signal is stored in the memory. The sonobuoy according to claim 1, wherein the transmitting device is activated only when it matches with the above.