JPS62259112A - Detector for position of target object - Google Patents

Abstract

PURPOSE:To discriminate a target object from its background based on the picture signal obtained from a sensor by setting an electromagnetic wave attenuating means consisting of a polarizing filter at the front of the sensor on which the electromagnetic wave is made incident. CONSTITUTION:The infrared rays serving as the electromagnetic wave received from a target object and its background pass through a dome 1 and then a polarizing filter 7 and the reflected infrared rays received from the polarized background are attenuated. These infrared rays pass through a lens group 2 and are converted into a CCD image sensor 3. These picture signals are processed by a navigation control arithmetic unit 5 to be turned into the flying object control signals and supplied to a steering servo 6 to change the movement of the flying object.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a target object detection device that detects the position of a target object using emitted electromagnetic waves.

[Conventional technology]

Figure 3 is “Introduction to Guided Weapons” (Foundation) “Defense Technology Association S5”
6. 11 is a diagram showing a conventional flying object guidance and control device equipped with a means for detecting the position of a target object using a CCD image sensor, which is described in the publication No.

In this figure, 1 is the dome, 2 is the lens group, and 3 is the CC
D image sensor, 4 is a gyro rotor that maintains the attitude of the CCD image sensor 3 with respect to space, 5 is a navigation control calculation device that calculates an acceleration command of the flying object, and 6 is an acceleration command calculated by the navigation control calculation device 5. This is a steering servo that changes the direction of movement of the projectile based on the received signal.

Next, the operation will be explained.

Electromagnetic waves arriving from the target object or its background are transmitted to the dome 1. The light passes through a lens group 2 and reaches a CCD image sensor 3. The electromagnetic wave is converted into an electrical image signal by the CCD image sensor 3, and this image signal is sent to the navigation control calculation device 5.
It undergoes signal processing to become a flying object control signal. By inputting this flying object control signal to the steering servo 6, the direction of movement of the flying object is changed and guidance is performed.

[Problem that the invention seeks to solve]

In the conventional flying object guidance and control device as described above, electromagnetic waves from the target object and its background reach the COD image sensor 3 only by passing through the dome 1 and the lens group 2. For example, the background reflects sunlight. If the target object is on a water surface, etc., the contrast between the target object and its background in the image signal obtained by the COD image sensor 3 is low;
There was a problem that it became difficult to distinguish between the two. .

The present invention was made in order to solve this problem, and provides a target object position detection device that can increase the contrast between the target object and its background in the image signal obtained by the sensor and easily distinguish between the two. The purpose is to obtain.

[Means for solving problems]

The target object position detection device according to the present invention is equipped with means for attenuating electromagnetic waves from the background by using a polarizing filter in front of a sensor into which electromagnetic waves are incident.

[Effect]

In this invention, since the electromagnetic waves emitted from the target object and the electromagnetic waves from the background have different polarization characteristics, when these electromagnetic waves are passed through a polarizing filter, they exhibit different attenuation, and the electromagnetic waves from the target object and the background electromagnetic waves are different. The contrast with electromagnetic waves increases.

〔Example〕

FIG. 1 is a diagram showing an embodiment of the target object position detecting device of the present invention.

In this figure, the same symbols as in FIG. 3 indicate the same parts,
A polarizing filter 7 rotates coaxially with the gyro rotor 4.

Next, the operation will be explained.

Electromagnetic waves arriving from the target object and its background pass through the dome 1 and then reach the polarizing filter 7.

At this time, consider, for example, infrared rays as electromagnetic waves, the target object is a direct infrared source, and the background is a water surface that reflects sunlight. In such cases, the infrared rays from the target object do not have a specific plane of polarization, whereas the infrared rays reflected from the background are almost always polarized in that direction.

Therefore, before the infrared rays reach the COD image sensor 3, the reflected infrared rays from the polarized background are attenuated by the polarizing filter 7, and the contrast with the target object, which is the direct infrared source, is increased, so the polarizing filter 7 and When the infrared rays transmitted through the lens group 2 are converted into an image signal by the COD image sensor 3, an image signal is obtained that allows easy discrimination between the target object and the background. This image signal is then processed by the navigation control arithmetic unit 5 to become a flight configuration signal,
It is input to the steering servo 6 to change the interlocking of the flying object.

Here, since the polarization plane of the reflected infrared rays from the background cannot be seen from the front of the car, by rotating the polarizing filter 7 together with the gyro rotor 4, the reflected infrared rays from the background are attenuated as a time average, as shown in Figure 2. I'm letting you do it.

In the above embodiment, the polarizing filter 7 was rotated coaxially with the gyro rotor 4, but by adding a device that detects the polarization plane of reflected infrared rays from the background, the polarizing filter 7 is rotated so that it is approximately orthogonal to the detected polarization plane. Rotate the polarization plane of 7,
It may be configured to attenuate reflected infrared rays from the background.

Further, in the above embodiment, the polarizing filter 7 is installed between the dome 1 and the lens group 2, but it may also be installed between the lens n2 and the COD image sensor 3, and the sensor is limited to the above COD image sensor 3. Not done.

Further, in the above embodiment, a case has been described in which the target object position detection device of the present invention is applied to a flying object guidance control device, but it goes without saying that the present invention is not limited to this.

〔Effect of the invention〕

As explained above, this invention is equipped with means for attenuating electromagnetic waves from the background using a polarizing filter in front of the sensor into which electromagnetic waves are incident, so that the contrast between the electromagnetic waves from the target object and the electromagnetic waves from the background is high. This has the effect that the target object and the background can be easily distinguished from the image signal obtained by the sensor.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an embodiment of the target object position detection device of the present invention, Fig. 2 is a diagram showing attenuation of reflected infrared rays from the background, and Fig. 3 is a diagram showing a conventional flying object guidance and control device. It is. In the figure, 1 is a dome, 2 is a lens group, 3 is a COD image sensor, 4 is a rotor, 5 is a navigation control arithmetic unit, 6 is a steering servo, and 7 is a polarizing filter. Note that the same reference numerals in each figure indicate the same or matching parts. Agent Masuo Oiwa (2 others) Figure 1 Figure 2 FJI - Figure 3 Procedural amendment (voluntary) 1. Indication of the case Japanese Patent Application No. 102371-1981 2.
Title of the invention Target object position detection device 3, relationship to the case of the person making the correction Patent applicant address 2-2-3 Marunouchi, Chiyoda-ku, Tokyo. Name (601) Mitsubishi Electric Corporation Representative Moriya Shiki 4, Agent address 2-2-3-5 Marunouchi, Chiyoda-ku, Tokyo
, Detailed Description of the Invention column of the specification subject to amendment and Drawing 6, Contents of amendment (1) Changed "rotation" on page 5, line 20 of the specification to "rotation"
and correct it. (2) Similarly, "rCCD image sensor" in lines 5 and 6 of page 6 is corrected to "rCCD image sensor." (3) Similarly, on page 6, lines 16-17, "from the image signal" is corrected to "in the image signal". (4) Fig. 1 is corrected as shown in the attached sheet. Above is Figure 1

Claims (1)

[Claims] In a target object position detection device that has a sensor that detects electromagnetic waves emitted from an object and detects the position of the target object, a polarizing filter is used in front of the sensor where the electromagnetic waves are incident to attenuate the electromagnetic waves from the background. A target object position detection device characterized by comprising means.