JPH03195900A - Laser apparatus - Google Patents

Abstract

PURPOSE:To reduce the probability discovered by an enemy and to shorten an irradiation time by preliminarily detecting the distance from a laser device to a target and calculating the distance from a projectile to the target on the basis of the distance data after the shooting of the projectile and starting the emission of a laser pulse for guiding the projectile when the distance reaches a predetermined value. CONSTITUTION:A laser apparatus is equipped with a pulse laser generator 12, a photodetector 13 for detecting the reflected laser beam from a target 2, a counter circuit 14 calculating the distance up to the target 2, a control circuit 15 calculating the distance from a projectile 3 to the target 2 on the basis of the data of the detected distance due to the counter circuit 14 and the shooting timing data of the projectile and generating the control signal driving the pulse laser generator 12 when the distance reaches a predetermined value and a clock generating circuit 16. In the counter circuit 14, the integration of a value V0 is started simultaneously with the shooting of the projectile to obtain a flight distance V0t after one sec and the difference between the distance V0t and the detected distance RL is calculated and the distance RM from the flight body 3 to the target 2 one sec after shooting is continuously obtained and, when the distance RM reaches a predetermined value, the pulse laser generator 12 is driven to start the emission of pulse laser.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a laser device, and more particularly to a laser device that detects laser reflected light from a target and guides a projectile toward the target.

[Conventional technology]

Laser devices for guiding projectiles to targets are known.

This type of laser device irradiates a target 2 with a laser beam 11 narrower than the shape of the target 2 from the laser device 1, as shown in FIG. A laser seeker 31 mounted on the head of the flying object 3 detects the laser reflected light 21 from the target 2 and outputs its angle information.

The servo device 32 steers the flying object to hit the target based on the angle information of the laser seeker 31.

[Problem to be solved by the invention]

The above-mentioned conventional laser device constantly irradiates the target 2 with a laser beam to guide the flying object, so it has a drawback that it has a high probability of being discovered by an enemy. Furthermore, when laser irradiation is attempted to be performed manually, the irradiator cannot grasp the timing to start laser irradiation, resulting in a delay in the start of irradiation and the disadvantage that the projectile may not be able to hit the target.

[Means to solve the problem]

The laser device of the present invention is a laser device that irradiates a laser beam, receives reflected light from a target, and tracks a flying object to a target, and includes a pulsed laser generator that generates a laser beam, and a laser beam that is reflected from a target by the laser beam. a counting circuit that calculates the distance RL to the target by counting the time from irradiation of the laser beam until receiving the reflected light from the target; and a known speed of the flying object. When the signal (RL-Vot) obtained by subtracting the product of the time t and the time t after launching the vehicle from the distance 1iRL reaches a predetermined value, the pulse laser generator is irradiated with the laser beam. It is configured to include a control circuit for starting and a clock generation circuit.

〔Example〕

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

FIG. 1 is a block diagram of an embodiment of a laser device according to the present invention. The embodiment shown in FIG.
, a light receiver 13 for detecting laser reflected light from the target 2, and a counting circuit 14 for counting the distance to the target 2.
Control that calculates the distance from the flying object 3 to the target 2 based on the information on the detection distance by the counting circuit 14 and the timing information of the projectile launch, and drives the pulse laser generator 12 when this distance reaches a predetermined value. It comprises a control circuit 15 that generates a signal and a clock generation circuit 16.

Laser beam 11 generated from pulsed laser generator 12
The laser reflected light 21 from the target is detected by the light receiver 13.

Since the trigger pulse of the laser beam obtained from the pulse laser generator 12 and the detection pulse obtained from the photoreceiver 13 have a time difference proportional to the distance, the trigger pulse of the laser beam is used as a start pulse to be obtained by the photoreceiver 13. The distance lll1RL is determined by counting the number of clock pulses generated by the clock generation circuit 15 using the counting circuit 14 using the laser reflected light pulse as a stop pulse. Distance counting of 3 or more is performed using a single pulse laser before launching the projectile. .

Next, the above-mentioned distance information and projectile launch timing information are supplied to the control circuit 16. Since the flight distance vo of the projectile is known, the control circuit starts integrating the value o at the same time as the projectile is launched in step 6, obtains the flight distance Vot seconds later, and calculates the previously detected distance RL. By calculating the difference between
Distance RM from projectile 3 to target 2 seconds after launch (
When this distance RM, which can be obtained continuously in time as RL-VQt), reaches a predetermined value, the pulsed laser generator 12 is driven to start pulsed laser irradiation. In this embodiment, the predetermined value of the distance RM at which pulse laser irradiation is started is set to a distance that ensures the minimum guidance time necessary for the flying object to hit the target.

〔Effect of the invention〕

As explained above, the present invention detects the distance from the laser device to the target in advance, calculates the distance from the projectile to the target based on this distance information after launching the projectile, and when this distance reaches a predetermined value. By starting the irradiation of laser pulses to guide the projectile at that time, the probability of being discovered by the enemy can be significantly reduced. Furthermore, since the irradiation time is shorter than that of the conventional method, there is also the effect that the battery consumption of the laser device can be reduced.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the laser device of the present invention,
FIG. 2 is an explanatory diagram of a system using the laser device of the present invention. 1... Laser device, 2... Target, 3... Flying object,
12... Pulse laser generator, 13... Light receiver, 1
4... Counting circuit, 15... Control circuit, 16... Clock generation circuit, 3 1... Laser seeker, 2... Servo device.

Claims (2)

[Claims] (1) A laser device that irradiates a laser beam, receives reflected light from a target, and tracks a flying object to a target, including a pulsed laser generator that generates a laser beam, and a light receiver that receives the reflected light from the target by the laser beam. a counting circuit that calculates the distance RL to the target by counting the time from irradiation of the laser beam until receiving the reflected light from the target, the known velocity V_o of the projectile, and the time t after the projectile is launched. a control circuit that causes the pulse laser generator to start irradiating the laser beam when a signal (RL-V_ot) obtained by subtracting the product V_ot from the distance RL reaches a predetermined value; and a clock generation circuit. A laser device comprising: (2) Signal obtained in the control circuit (RL-V_
2. The laser device according to claim 1, wherein the predetermined value of ot) is set to a distance that ensures a minimum guidance time necessary for the projectile to hit the target.