JPH01410A - distance measuring device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to measuring the elevation angle of a ground target and the altitude of an observation point without directly measuring the distance to the ground target using radar, laser, etc. This invention relates to a device that calculates the distance to m.

[Conventional technology]

Fig. 3 is a block diagram showing a conventional distance measuring device using radar, laser, etc. In Fig. 3, (1) is an imaging section, (
2) is a target designation tracking unit which inputs the image signal output from the imaging unit (1), manually designates a target image included in this input image signal, and tracks the designated target image;
1 is shooting +1! A distance measuring section (41 is an imaging section (11) and a distance measuring section (41) which measures the distance of a target in this visual direction using a radar, a laser, etc.);
31 visual field azimuths are simultaneously controlled manually and automatically, the visual azimuth reference tracking tracking angle signal of the target image outputted by the target designation tracking unit (2) is inputted, and the imaging unit (1) uses the input visual field azimuth reference tracking angle signal. ) and distance measuring unit (3) automatically move toward the target image at the same time.
, a visual field orientation control detection unit that detects the visual field orientation of the imaging unit (1), and (5), a captured image signal in which the target image is designated and a visual field orientation control detection unit (
41 outputs the visual field direction signal of the imaging unit il+ and the distance measuring unit (
This is an image gI display unit that receives the measured distance signal of the target object in the visual field direction of the imaging unit (1) outputted by the imaging unit (1) and displays the specified captured image of the target image, the visual field direction, and the distance of the target object. Next, the operation will be explained. Image display section (5) controls the visual field direction of 5 (11) and searches for the target object while monitoring the photographed image of the image capturing section +11 displayed on the image display 5 (5). By specifying the target in the image signal via the target designation tracking unit (2) for the target visually recognized in 5), the target designation tracking! 11 (21 indicates the target in the image signal). Performs tracking and automatically controls the viewing direction of the visual field direction control detection unit (portion of the imaging unit based on the visual field direction basic tracking angle signal from the 41-digit target designation tracking unit (2)) to the direction of the specified target. The distance measuring section (31), which has the same field of view as the imaging section (1), measures the distance of the designated target being tracked, and displays the designated captured image of the target (71) and the imaging section (31). 11 visual field direction and the distance to the designated eye 8A are displayed.

[Problem that the invention seeks to solve]

Since the conventional device is configured as described above, the distance measuring section (
8) requires the radiation of electromagnetic waves such as a high-power laser to measure the distance.There were problems such as a lack of stealth as the target object was irradiated with 11L magnetic waves.

This invention was made to solve the above-mentioned problems, and it is possible to measure the angle of elevation and elevation of an observation point with respect to a target without irradiating the target with electromagnetic waves.
The purpose of this invention is to obtain a device that can indirectly calculate the distance to a target on the ground.

[Means for solving problems]

The distance measuring device according to the present invention uses the azimuth angle signal of the target obtained from the altitude detecting section, the visual field azimuth control detecting section, and the target designation tracking section instead of the ranging section of the conventional device. A target elevation angle calculation section that calculates an elevation angle, and a target distance calculation section that calculates a target distance from an altitude signal outputted by the altitude detection section and a target elevation angle signal outputted from the target elevation angle calculation section are provided. This pressure is used to indirectly measure the distance to a target.

[Effect]

In this invention, the altitude of the observation point and the elevation angle of the target are measured to indirectly calculate the target distance.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In Fig. 1, (1) is the imaging section, (2) is the imaging section + I
Target designation tracking unit 6 (4! is the imaging unit +11 input from target designation tracking unit (2)) which adds a designation symbol to the target image in the image signal input from + and tracks the designated target image a visual field azimuth control detection unit that controls the visual field azimuth of the imaging unit (!) in the direction of the target using the visual field azimuth reference tracking angle signal and a manually input control signal, and detects the visual field azimuth angle of the imaging unit (1); (5) is an image display section.

(61 is the visual field azimuth angle signal of the imaging unit (1) input from the visual field azimuth control detection unit (4) and the target designation tracking 5 (2)
C71 is an altitude detection unit that outputs the observational altitude; This is a target distance calculation unit that calculates the distance to the target from the input elevation angle signal of the target and the altitude signal of the observation point input from the altitude detection unit ( ). It displays the captured image in which the target is specified and the distance to the target based on the captured image signal in which the target image is specified and inputted from the tracking unit (2) and the target distance signal inputted from the target distance calculation unit 181. be.

FIG. 2 shows the principle of this invention.

#2 In the diagram, A is the observation point, B is the horizon seen from point A,
C is the target point, D is the lichen point directly below point A, 0 is the center point of the earth, ψj, ψ2 are the elevation angles of the horizon/target point from the observation point, θ1. When θ2 is the elevation angle between the horizon and the observation point from the center of the earth, ro is the radius of the earth, and h is the height of the observation point, the following equation holds.

ψ1+θ1=2 □fi1h+ro(1
−aθ2) Corridor θ2=□−ψ2 − +31 (From formula 11+21131, θ2=μ−1(ritoothψ2)−92□(4)O Therefore, the distance at the target point is Observation point altitude and target elevation angle calculation unit obtained from +71 (
It can be calculated from the elevation angle of the target point obtained in step 6).

r mountain = rO (me-1 (hard exit ψ2) - ψ2) -+5+O [Effects of the invention] As described above, according to the present invention, the distance to a landmark can be measured using the altitude of the observation point and the elevation angle of the target. Since the distance to the target is indirectly calculated by measuring , the distance can be measured covertly.

[Brief explanation of drawings]

Figure 1 is a block diagram showing a distance measuring device according to an embodiment of the present invention, and Figure 2 is a geometric diagram showing the relationship between altitude, elevation angle, and distance to a target used in the present invention. FIG. 3 is a block diagram showing a conventional distance measuring device. In the figure, (1) is an imaging unit, and (2) is a target designation tracking unit. (41 is a viewing direction control detection unit, (5) is an image display unit, (
6) is a target elevation angle calculation unit, (71 is an altitude detection unit, (81 is
is a target distance calculation unit. In Figure 1, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] An imaging unit and an image signal output from the imaging unit as input,
a target designation tracking unit that specifies a target image included in the input image signal and tracks the designated target image; and a target designation tracking unit that controls the field of view direction of the imaging unit and outputs the target image by the target designation tracking unit. a visual field azimuth control detection unit that receives an azimuth reference tracking angle signal as input, controls the visual field azimuth of the imaging unit in the direction of the target image based on the input visual field azimuth reference tracking angle signal, and detects the visual field azimuth of the imaging unit; , a target elevation/elevation angle calculation unit that calculates the elevation angle of the target by receiving the visual field azimuth reference tracking angle signal outputted by the target designation tracking unit and the visual field azimuth angle signal outputted from the visual field azimuth control detection unit; and an altitude measurement unit. a target distance calculation unit that calculates the distance to the target by inputting the target elevation angle signal outputted by the target elevation angle calculation unit and the observation point altitude signal outputted by the altitude measurement unit; and the target specified tracking. an image display section that receives as input the captured image signal in which the target image outputted by the section and the target distance signal outputted by the target distance calculation section and displays the captured image signal in which the target is specified and the target distance; A distance measuring device comprising: