JPS62239076A - Target detector - Google Patents

Abstract

PURPOSE:To determine the position of a airframe body and to direct a counter weapon by detecting temperature differences that flares of the warhead and tail parts of the precise guidance firearm in the airframe to the background temperature of the land. CONSTITUTION:An infrared optical reception system 2a receives incident infrared rays 1a and a detector 4a converts the condensed infrared rays 3a into a current signal corresponding to its intensity. A cooler 5a cools the detector 4a. A CCD driving circuit 10, on the other hand, receives a synchronous control signal 9 and inputs a reset signal, a bias signal, and a gate signal to the CCD incorporated in the detector 4a to activate the CCD. For the purpose, (n) (n=3-4) sets of this constitution are prepared, arranged at specific intervals of an angle thetaon a circumference, a shifted circumferentially by the specific angle theta. Consequently, infrared rays emitted by the airframe are detected on a passive basis from a wide range area in a short time regardless of the type of the opposite precise guidance firearm and the counter weapon is directed to the target position speedily.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention utilizes infrared wavelength bands to search and detect flying targets, and detect flying targets to rapidly direct a weapon toward the target. The present invention relates to a detection device.

[Conventional technology]

This invention can be used to fly close to the ground at high speed.
The present invention relates to a flying target detection device as a countermeasure for protecting vehicles and the like against secretly guided firearms. Conventionally, a laser detection device has been developed for a similar purpose.This is a device that detects laser beams when the opponent's precision-guided firearm or its launcher emits laser light for the purpose of target ranging or target tracking. It attempts to detect the direction of the light radiation source and issue an alarm. This conventional device uses a wide-field optical system (for example, five optical systems with a field of view of 36° x 10° arranged horizontally and circumferentially) to condense the incoming laser light over a 180° range in front of each Laser light is detected by a detection element such as an APD (avalanche photodiode) arranged corresponding to the optical system, and the direction of arrival of the laser is determined from the detected directional position and reception intensity of the APD.

[Problem that the invention seeks to solve]

The biggest drawback of this laser detection device is that it is only effective when the opponent's precision-guided firearm or its launcher uses a laser beam method, but when using other methods that use electromagnetic waves. It lies in the fact that it is not useful.

This invention was made to fundamentally improve these drawbacks, and utilizes infrared rays to passively detect the opponent's precision-guided firearm or the method of its launcher. .

[Means for solving the problem] In other words, the warhead and tail flare of a precision-guided weapon during flight have a temperature difference with respect to the land background temperature, and by detecting this temperature difference, it is possible to prevent the warhead from flying. This is an attempt to determine the position of an object.

In this invention, a plurality of infrared optical systems are arranged at predetermined angular intervals of θ to cover about 180° in front of the vehicle to be protected, and an infrared detection device 6 ( Here, IRCCD: Infrared charge-coupled device, which has device sensitivity in the wavelength band of 3 to 5 μm.)
It detects the target it is about to fly to as a bright spot, and aims a counter-weapon at high speed in the direction of the bright spot.

[Effect]

This invention is designed to detect flying targets from a wide range of areas, and to detect flying targets as quickly as possible at long distances.
, and a combination of an optical system with high resolution (e.g. 256 x 512 pixels) and an LCCD.

By arranging multiple bears (for example, 4 bears) and scanning them in the turning direction by a predetermined angle θ (however, θ = approximately 45°), it is possible to cover 180° in front and reduce the target ratio due to scanning speed. This is to extend the maximum detection distance.

〔Example" FIG. 1 is a diagram showing an embodiment of the present invention.

(1a) and (1n) are infrared rays emitted from the field of view including the target, (2a) and (2n) are infrared receiving optical systems), and incoming infrared rays H (3a) and (6n) are detected by the detector (
4a) and (4n). (5a) and (5
n) is a detector (4a).

(4n) That is, it is a cooler for cooling the dewar mechanism in which the LCCD is arranged to 77'K. (6) is a clock generator that determines the system timing of the target detection device; the clock signal (7) is input to a synchronization control circuit (8) that creates synchronization signals for each part. Synchronous control circuit (9) is CCD drive circuit (10a), (10n)
The CCD drive circuit receives CC signals such as reset signals, gate signals, and bias signals necessary for driving the CCD.
D drive signals (11a) and (11n) are created and connected to each pin of the 11'LCD in the detectors (4a) and (4n).

In the IRCCD, a large number of detection elements are arranged on a two-dimensional matrix, and each detection element is a pixel unit. The infrared detection energy of each detection element arranged on this matrix, respectively.

A realistic video output signal (1
2a), (12n) to the CCD drive circuit,
It is read out at a predetermined timing.

(13a) and (13n) are Il placed in the detector.
'This is a preamplifier that amplifies and adjusts the gain of the video output signal of the LCDD. (14a) and (14n) are preamplifier outputs.A9. A7'D converter (15a), (1
5n) and synchronized with the timing of the synchronous control signal B (IG).

, H conversion output signals (17a), (17n) are sequentially written into and read out from the memory RAMs (18a), (18n), and the start-up signals (19a), (19n) are read out.
As, bright spot position direction rotation dlr (20a), (20n
) Input sale, fly 1. A position signal (21a) for the detector that determines the bright spot coordinates of l[.

(21n) is input to the bright spot position determination circuit.

The bright spot position determination circuit determines the intensity level, shape, etc. of the bright spot based on a predetermined algorithm, and outputs a total of n'r! as the bright spot position determination signal (c). It is sent to A, etc., and processed together with other parameters such as the current position of the weapon, and ultimately directs the weapon position to the target in real time.

FIG. 2 shows the infrared receiving optical system explained in FIG. 1.

FIG. 3 is a diagram showing the arrangement of a combination of a detector and a cooler.

(81) l (82) , C83) , <84)
are a combination of the infrared receiving optical system, the detector, and the cooler, each of which is arranged on the circumference of the center (0) with an opening of a predetermined angle θ. The infrared detection system arranged in this way is shown in Fig. 2 as ta) + tbl + (c) + (a
) By scanning at a predetermined angle (θ-45°) in the direction of the arrow shown in ), it is possible to search for a target in a 180° area from the left direction (Xl) to the right direction (X2) centering on the forward LY1 direction. For example, 45° scan, 1.0 seconds for forward and 90 seconds for return.
．． It is conceivable to drive for 5 seconds. This scanning pattern is designed based on the target and target detection required time. The reason for arranging multiple infrared optical systems in this way is to search a wide range of areas in a short time.

While alleviating the deterioration of target ratio due to scanning speed.

This is to extend the detection distance.

Fig. 3 is a diagram showing the range of elevation angles relative to the target to be flown, and since the target to be dealt with in this invention is an object flying at a high speed near the ground, the possible distance to be flown and its altitude are From relationships.

This is intended to show the elevation angle viewing area that an infrared optical system should have. In FIG. 3, (H) is the altitude and (R) is the horizontal distance, indicating that if the elevation angle is 5.4 degrees, it is possible to search for a flying target up to an altitude of 20 m at a distance of 21 ann.

FIG. 4 is a diagram showing an example of the elapsed time when the target is about to fly towards the infrared optical system of the present invention, and t'r
) is the time it takes for the flying body to land.

(0) is the infrared optical system position, that is, the self-position, (TI
) is the time required for the device of the present invention to search for a target, (T2
) is the time required to detect and determine the target position, and (T3) is the time required to synchronously orient the weapon in the direction of the target.

(T4) indicates the time to direct the weapon toward the target, apply firepower, and respond.

〔Effect of the invention〕

As described above, according to the present invention, when protecting one's own vehicle from the opponent's precision-guided firearm, regardless of the method of the opponent's precision-guided firearm, the opponent's vehicle passively absorbs infrared rays emitted by the target from a wide range.

It also has the effect of being able to detect the target in a short period of time, quickly directing the weapon to the detected target position, and dealing with it.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a flying target detection device according to an embodiment of the present invention, and FIG. 2 is an infrared receiving optical system. FIG. 3 is a diagram showing the range of elevation angles relative to the target to be flown, and FIG. 4 is a diagram showing an example of the elapsed time of the target to be flown. (2a), (2n) are infrared receiving optical systems, (4a)
) and (4n) are detectors, (5a) and (5n) are coolers, and (1oa) and (1on) are CCD drive circuits. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] an infrared receiving optical system that receives incident infrared rays; an infrared detector that converts the infrared rays collected by the infrared receiving optical system into a current signal according to its intensity; and the infrared detector. A cooler for cooling, and a CCD drive circuit for receiving a synchronous control signal and inputting a reset signal, a bias signal, and a gate signal to the CCD built in the infrared detector to activate it, One set is formed, and n sets (n = 3 to 4) are prepared, and each set is arranged on the circumference at a predetermined angle θ interval from each other, and each set is arranged on the circumference. A target detection device characterized in that it can be shifted in a direction by a predetermined angle θ.