JPS6315180A - Infrared source detector for flight body - Google Patents

Abstract

PURPOSE:To obtain the motion information of a target, by adding a second operation apparatus for calculating the time required before a flight body and the target are associated from the image signal of the target. CONSTITUTION:Infrared rays emitted from a target transmit through a dome 1 and formed into an image on a CCD image sensor 3 by a lens group 2. The infrared image of the target is converted to a detection signal and this signal is processed by a first operation apparatus 4 to obtain information relating to a visual angle. Further, the detection is applied to a second operation apparatus 5 and the time required before a flight body and the target are associated using the size of the target obtained from both image signals and the change ratio thereof. Therefore, an induction rule having a high hit ratio can be used without requiring a separate apparatus for obtaining information relating to a distance by an electromagnetic wave other than infrared rays.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a target object detection device for a flying object, which obtains movement information of a target object by detecting infrared rays emitted by the target object.

[Conventional technology]

FIG. 2 is a block diagram showing a conventional infrared source detection device for flying objects. In the figure, 1 is a dome, 2 is a lens group that focuses infrared rays from a target object onto a charge-coupled device (9CD), and 3 is a block diagram showing a conventional infrared source detection device for a flying object. The COD image sensor 4 is an arithmetic unit that processes a detection signal.

Next, the operation will be explained. The infrared rays emitted by the target object are
The light passes through the dome 1 and is imaged on the CCD image sensor 3 by the lens group 2. The infrared image from the target object focused on the CCD is converted into a detection signal, and this detection signal is processed by the arithmetic unit 4 to determine the angle formed by the coordinate axis fixed to the flying object and the line segment connecting the flying object and the target object. Information regarding (eye angle) is calculated.

[Problem that the invention seeks to solve]

Conventional infrared for flying objects! Since the FA source detection device is configured as described above, information regarding the eye angle cannot be used to guide the flying object, and a guidance rule with low accuracy cannot be used.

In addition, the time until the meeting with the target body, so-called timeto
If you try to use the m1 law with high accuracy using go, there are problems such as the need for a separate detection device such as a dosoplar array f' that uses electromagnetic waves other than infrared rays to detect the distance to the target or the approaching speed. there were.

This invention was made in order to solve the above-mentioned problems, and it is a flying object that can obtain information about the viewing angle as well as the time until the meeting of the flying object and the target object without using electromagnetic waves other than infrared rays. The purpose of this invention is to obtain an infrared source detection device for the body.

[Means for solving problems]

The infrared source detection device for a flying object according to the present invention uses the size of the target object and its rate of change in the detection signal (image signal) obtained by the target object detection device to detect the distance between the flying object and the target object. A second arithmetic unit is added to calculate the time until the meeting.

[Operation] In this invention, the added second arithmetic unit is C
The size of the target object and its rate of change are calculated from the image signal of the target object obtained by the CD image sensor, and the time until the flying object meets the target is calculated. The Mm law with high accuracy can be used without requiring a separate device to detect distance or approach speed.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure shows an infrared source detection device for a flying object according to an embodiment of the present invention. In the figure, l is a dome, 2 is a lens group that images infrared rays from a target object on a CCD, 3 is a CCD image sensor, and 4 is a a first arithmetic device that processes the detection signal; 5;
is a newly added second arithmetic unit.

Next, the operation will be explained.

The infrared rays emitted by the target object pass through the dome 1, and are transmitted through the lens group 2.
An image is formed on the CCD image sensor 3 by. COD
The infrared image of the target object focused on is converted into a detection signal and processed by the first arithmetic unit 4 into information regarding the eye angle. In addition, in detection No. 48, the second arithmetic unit 5 calculates the time until the flying object meets the target object using the size and length of the target object obtained from the image belief and the rate of change thereof. Ru. There is an angle θ between the length l of the target object shown in Fig. 3, the distance R between the flying object and the target object, the distance f between the lens group and the CCD image sensor, and the length d of the target object imaged on the CCD.
The following relationship is established through .

However, the time change of l was ignored, and the angle θ was assumed to be small. Also, (6) represents time differentiation.

As mentioned above, the first. Since the second arithmetic unit 4.5 can obtain information regarding the line of sight angle (azimuth) and the time until meeting (distance), accuracy can be improved without the need for a separate device that obtains information regarding distance using electromagnetic waves other than infrared rays. This has the effect of being able to use a high induction side.

In the above embodiment, the second arithmetic device 5 receives the detection signal as an input, but it may also receive intermediate data from the first arithmetic device 4 as an input.

Further, in the above embodiment, the calculation was performed using the length of the image of the target object, but the calculation may be performed using the area of the image.

〔Effect of the invention〕

As described above, according to the infrared source detection device for a flying object according to the present invention, the second arithmetic unit that calculates the time until the meeting of the flying object and the target object from the image signal of the target object is added. By using this information together with the conventional information regarding the eye sight angle, it is possible to use the guidance side with high accuracy.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an infrared source detection device for a flying object according to an embodiment of the present invention, Fig. 2 is a block diagram showing a conventional example, and Fig. 3 shows the positional relationship between the viewing angle and the flying object. It is a diagram. In the figure, 1 is a dome, 2 is a lens group, 3 is a CCD image sensor, 4 is a first computing device, and 5 is a second computing device.

Claims (1)

[Claims] (1) a target detection device that detects infrared rays emitted by the target using a charge-coupled device; and receiving a detection image obtained by the target detection device;
a first arithmetic unit that obtains information regarding the line of sight angle between the flying object and the target object from the detected image; an infrared source detection device for a flying object, comprising: a second arithmetic device that calculates the time of the second arithmetic operation; and a arithmetic device that detects the distance and angle to the target object.