JP3132748B2 - Target direction determination mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can detect a moving target such as a helicopter or a tracked vehicle, and can output a firing or firing signal by directing the direction of power of the explosive filler in the direction.
In a proximity type unmanned weapon trigger device having a reversible safety unwinding mechanism, when a target sound (target) approaches, a target direction determining mechanism capable of detecting the approach direction of the target sound by aerial sound It is.

[0002]

2. Description of the Related Art In recent years, for unmanned firearms, the approach of a target is detected by an acoustic sensor or the like, a radio wave sensor is directed at the target, signal processing is performed based on the reflected radio wave of the target, the target position is determined and fired. A trigger device has been proposed (for example, JP-A-5-280899). However, in the unmanned weapon trigger device, in the search process before tracking the target after the radio wave sensor is activated,
Searching while swinging a beam over a wide three-dimensional space using a radio wave sensor takes a long time to search, and it may be necessary to increase the transmission power to search for a distant moving target.

[0003]

In the conventional unmanned firearm trigger device, the horizontal search is performed by selectively switching the row of directors of the horizontal antenna elements, and the elevation search is performed by a vertically rotating vertical antenna. The search is performed by selectively switching the row of directors of the elevation angle antenna elements provided on one surface and sequentially scanning the target within the hemisphere. The processing time from the transmission / reception signal in which the directions in the hemisphere are sequentially switched to the extraction of the target is the time required for the horizontal rotation of the elevation angle detection antenna. However, there is a drawback that the target cannot be captured and the transmission power consumption increases.

At this time, even if the number of search points is reduced by using a wide-angle beam, the transmission power must be increased according to the beam width to obtain the same echo signal strength, and the consumption of search power is greatly reduced. I can't do that. Since the transmission power required for searching for a target is generally proportional to the fourth power of the distance, there is a problem that the power supply for the trigger device is quickly consumed for a high-speed target in combination with an increase in the transmission time for searching from a long distance. Was.

[0005]

Accordingly, the present invention has solved the above problem by employing the following means.
It uses a sound sensor to detect the sound generated by helicopters and tracked vehicles, and when the level (magnitude) of this sound signal rises above a predetermined level, activates the radio wave sensor to search for the target. Instead, the signal from the acoustic sensor is whitened by whitening means, the direction angle between the target and the reference coordinate axis is calculated, and the direction angle is used as a radio sensor (in this case, the radio sensor functions as a tracking radar). Is transmitted to

[0006]

In the target direction determining mechanism of the present invention, when a target such as a helicopter or a tracked vehicle approaches the trigger device for an unmanned weapon, the sound generated by the target is detected by an acoustic sensor. Next, when the value detected by this sensor becomes equal to or higher than a predetermined first level, the direction angle measurement calculating means and the radio wave sensor are turned on for the first time and sound is continuously detected, and the detected value becomes equal to or higher than the second level. Then, the direction from the target to the reference coordinate axis is calculated by whitening the signal from the acoustic sensor by means for whitening and cross-correlating the white signal, and the calculated value is transmitted to the radio wave sensor. Then, the radio wave sensor antenna can be directed and tracked in the target direction.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a target direction determining mechanism according to the present invention will be described with reference to the drawings. FIG. 1 shows a block diagram of the target direction determining mechanism. A sound generated by a target such as a helicopter or a tracked vehicle is detected by the acoustic sensor 1. That is, the signal of the acoustic sensor 1 is amplified by the amplifier 5, passes through the filter 6 for cutting the background noise, and is applied to the comparator 14. When this signal exceeds the reference voltage of the comparator 14, the power of the entire trigger device is turned off. enter. On the other hand, the sound signal output is A / D
It is applied to the computer 13 through the converter 7 and also to the comparator 15. When the input signal exceeds the reference voltage, the comparator 15 notifies the computer 13 of an operation start instruction signal in the target direction. Computer 1
The signal processing unit 3 processes signals from the acoustic sensor 1 passing through the amplifier 5, the filter 6, and the A / D converter 7 based on the respective output signals of the acoustic sensors 2, 3, and 4.

By the way, an acoustic sensor 1 is used for detecting a target.
However, the output signals from the acoustic sensor 2 to the acoustic sensor 4 may be used. The acoustic sensors are arranged at the same distance from the origin on the XYZ coordinate axes and each axis.
These acoustic sensors may be oriented in any direction.

The computer 13 calculates the target direction in which direction the target (sound source) is located with respect to a predetermined reference direction based on the arrangement state of the acoustic sensors, and transmits this value to the computer 12. At this time, the computer 13
Removes a low-frequency component from an acoustic signal from each acoustic sensor, extracts a high-frequency component (whitens), and uses the white signal from the acoustic sensor 1 as a reference white signal to calculate the reference white signal and the white signal of each acoustic sensor. Cross-correlation processing is performed between them, and a target direction is calculated from a mutual time relationship.

Next, the computer 12 detects the radio wave sensor 8 based on the target direction transmitted from the computer 13.
After controlling the motor 109 for vertically oscillating the warhead with the antenna attached thereto and the motor 10 for horizontally oscillating the warhead, the beam direction of the radio wave sensor 8 is directed to the target direction, and after tracking the target, A signal is output to the primer 11.

[0011]

According to the present invention, when approaching a tracked vehicle or a helicopter during high-speed flight, it is possible to indicate the initial pointing direction of the radio wave transmission / reception sensor to the target direction calculated from the acoustic sensor signal. This eliminates the need for the search function of the radio wave sensor, thereby reducing the transmission power at the time of searching for the radio wave sensor, and has the effect of reducing power consumption as compared with the sensor system of the conventional trigger device for unmanned weapons. Also, the target direction calculation time is compared with the total calculation processing time of each beam direction search in the hemisphere by the radio wave sensor in the conventional method, and the processing target is a minute section time series signal of several sensor outputs. This has the effect of being significantly reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram of a target direction determining mechanism of the present invention.

[Explanation of symbols]

1 Acoustic sensor (provided on the origin on the XYZ axis) 2 Acoustic sensor (provided on the X axis on the XYZ axis) 3 Acoustic sensor (provided on the Y axis on the XYZ axis) 4 Acoustic sensor (Z on the XYZ axis) 5 Amplifier 6 Filter 7 A / D converter 8 Radio wave sensor for tracking 9 Motor for rotating the direction of power of the explosive charge in the vertical direction 10 Motor for rotating the direction of power of the explosive charge in the horizontal direction 11 Primer 12, 13 Computer 14, 15 Comparator

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-280899 (JP, A) JP-A-4-369414 (JP, A) JP-A-3-112679 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) F42B 23/04 F41G 3/00 F42C 13/06 G01S 3/80

Claims (1)

(57) [Claims] An acoustic sensor for detecting a sound generated by a moving target and a radio wave sensor are activated based on a detection value of the acoustic sensor, a position thereof is determined from a reflected radio wave of the moving target, and a power direction of the explosive filler is determined. In a proximity type unmanned weapon trigger device that has a reversible safety unwinding mechanism that outputs a firing or firing signal toward a moving target, when it detects that the target sound has increased above a predetermined level, A means for whitening a signal from the sexual acoustic sensor and means for calculating a direction angle between a target sound (target) and a reference coordinate axis based on the whitened signal. Characteristic target direction determination mechanism.