JPH06257996A - Guiding apparatus - Google Patents

Abstract

PURPOSE:To suppress a guiding error due to a back scattering light of a guiding apparatus for a missile to be operated by a semiactive system and to exclude an operating limit. CONSTITUTION:Light receiving windows 61a, 61b for receiving back scattering light 104 are arranged in a missile 3a, and a pair of back scattering light sensors 6a, 6b and a gate 7 are provided in a guiding unit 2a to be placed. When the light 104 is incident on the sensors 6a, 6b via the window 61a or 61b, a gate signal 601a or 601b is generated, the gate 7 suppresses to output the scattering light including a laser incident light 105 incident to a sensor 4 to a signal processor 5 by the signal 106a or 601b, and only a target reflected light is output, thereby excluding influence of the scattering lights.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guiding device, and in particular, it receives reflected light of pulsed laser irradiation light emitted toward a target from a laser irradiation device mounted on a flying object and arranged at a position different from the flying object. The present invention relates to a guidance device that operates in a semi-active system in which a target position is detected and a flying object is guided to the target.

[0002]

2. Description of the Related Art A laser irradiator arranged at a position different from that of a flying body equipped with a guidance device detects reflected light from a target by pulsed laser irradiation light radiated toward the target while detecting its direction to fly. A method of guiding the body toward a target is known as a semi-active method.

FIG. 3 is a conceptual diagram for explaining the semi-active type induction.

The laser irradiator 1 is arranged at a position different from the flying body 3, for example, at a fixed point on the ground or a moving body such as an aircraft or a vehicle, and irradiates the target 102 with the pulsed laser irradiation light 101. Target reflected light 103 from target 102
Are captured via the light receiving optical system of the guiding device 2 mounted on the flying object 3, and the guiding device 2 guides the flying object 3 to the target 102 while determining the direction of the target 102 based on this light receiving input. In addition to the target reflected light 103, the pulsed laser irradiation light 101 is backscattered light reflected / scattered by minute scatterers such as water and dust existing in the propagation space, in addition to the target reflected light 103. 104 is included.

As shown in FIG. 4, the guiding device 2 includes a detecting section 4 for photoelectrically converting a received light input to detect and output, and various kinds of unillustrated guiding outputs for processing the detected output and guiding the flying object 3 to a target. Signal processing unit 5 to be supplied to the steering actuator
With. The detection unit 4 receives the laser incident light 105 through a light receiving window (not shown) provided on the head of the flying object 3 and using a member that is transparent to the substantially hemispherical laser light, and outputs a detection output 401. The signal is output to the signal processing unit 5. The laser incident light 105 includes the backscatter light 104 as well as the target reflected light 103 reflected from the target 102, as described above with reference to FIG. Backscatter light 10
In No. 4, the generation state (generation distribution, size, etc.) depends on the state of the laser propagation space, but it has been proved that almost always occurs. The signal processing unit 5 detects the detection output 401.
The target azimuth is determined on the basis of the output of 1 and the guidance outputs as various actuator drive signals for guiding the flying object 3 to the target are transmitted.

FIG. 5 is a waveform diagram of main signals of the induction device 2. The laser incident light 105 shown in FIG. 5A includes the backscattered light 104 in addition to the target reflected light 103. Therefore, the detection output 401 shown in FIG. 5B also includes the backscattered light in addition to the target reflected light detection output S1. The detection output S2 is included.

[0007]

In this conventional semi-active type guiding device, incident light includes not only reflected light from the target but also backscatter light generated by scattering due to water and dust present in the propagation space. However, depending on the level, there is a problem that the signal is processed in the same manner as the reflected light from the target and the accurate position detection of the target cannot be performed.

Further, the influence of the backscatter light increases as the arrangement distance between the laser irradiation machine for sending the pulsed laser irradiation light to the target and the guiding device, that is, the flying object becomes closer. There was a problem of being restricted.

The object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide a guiding device that can eliminate the influence of backscatter light, ensure accurate position detection, and eliminate the restriction on the arrangement interval between the laser irradiation device and the flying object.

[0010]

The guiding device of the present invention is a device for reflecting pulsed laser irradiation light, which is radiated toward a target from a laser irradiator mounted on a flying object and spaced apart from the flying object, from the target. In a guiding device that operates in a semi-active system that guides the flying object toward the target while capturing light, the pulse laser irradiation light by a minute scatterer of water or dust existing in the propagation space of the pulse laser irradiation light And a backscatter light suppressing means for eliminating an influence of the backscatter light by providing a dead time zone for the reception processing of the backscatter which is reflected and scattered light.

Further, in the guiding apparatus of the present invention, the backscatter light suppressing means receives and detects the backscatter light from at least two light receiving windows symmetrically arranged on the body side wall of the projectile with respect to the body axis. A time gate for suppressing signal processing of the backscatter light included in the light receiving input of the guiding device is set based on the detection output.

Further, the guiding apparatus of the present invention captures the reflected light from the target of the pulsed laser irradiation light emitted toward the target from the laser irradiation machine mounted on the flying object and arranged apart from the flying object. In a guidance device that operates in a semi-active system that guides the flying object toward the target,
Detecting means for receiving the pulsed laser reflected light, photoelectrically converting it, and sending out a detection output, and a guide output for determining the direction of the target based on the detection output and guiding the flying object toward the target. At least 2 are provided for the signal processing means for sending out, and the backscatter light, which is reflected and scattered light of the pulsed laser irradiation light by minute scatterers of water and dust existing in the propagation space of the pulsed laser irradiation light, on the flying object. Backscatter light detection means for receiving light from any one of the two light receiving windows and detecting it, and outputting a gate signal with a pulse having a predetermined characteristic; and sending of the detection output to the signal processing means by the gate signal, the pulse of the gate signal. Gate means for suppressing in a time zone corresponding to the width.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In this embodiment, the backscatter light 1
When two light receiving windows 61a and 61b for receiving 04 are arranged symmetrically with respect to the body axis of the flying body 3a and on the left and right sides of the outer wall of the flying body, a guiding device for receiving reflected light from the target and guiding the flying body 3a. 2a will be described.

The guide device 2a mounted on the flying body 3a is
Laser incident light 105 received through a light receiving window 41 made of a member transparent to the laser light provided on the head of the flying object 3a.
And a pair of light receiving windows 61a and 61 using a member transparent to the laser light for receiving the backscatter light 104 provided in a pair on the left and right symmetrically with respect to the body axis of the flying object 3a.
a pair of backscatter light detectors 6a and 6b for detecting the backscatter light 104 input through b;
A gate circuit 7 for generating a gate signal 601a or 601b for setting a dead time zone of the guiding device 2a for the backscatter light included in the input from the detector 4 based on the output of the backscatter light detector 6a or 6b.
And a signal processing unit 5 for processing the output of the gate circuit 7 to obtain the guided output of the flying object 3a.

FIG. 2 is a waveform diagram of main signals of the guiding device 2a of this embodiment. The operation of this embodiment will be described below with reference to FIG.

The detection unit 4 passes through the light receiving window 41 and is shown in FIG.
The laser incident light 105 shown in FIG. 2 is received, photoelectrically converted into the detected light, and the detection output 401 is sent to the gate circuit 7. As shown in FIG. 2A, the laser incident light 105 includes the desired target reflected light 103 and a backscatter light 104 of a higher level at a sufficiently shorter distance than the target.

The backscattering light 104 depends on the distance between the laser irradiator 1 and the flying object 3 shown in FIG. 3 and the distribution of minute reflectors of water and dust contained in the propagation space of the pulsed laser irradiation light 101. Level and time width fluctuate. Speaking of the time width, for example, when the pulse width of the pulse laser irradiation light 101 is 10 nS (nanosecond), the pulse width is expanded to several tens of nanoseconds to 100 nS. However, since the pulse laser irradiation light 101 is originally an extremely short pulse, it is enlarged. Even so, it is a very short pulse. The backscatter light 104 is received by the detection unit 4 at a time sufficiently earlier than the target reflected light 103. The backscatter light 104 is received by the backscatter light detector 6a or 6b through the light receiving window 61a or 61b corresponding to the relative position between the laser irradiator 1 and the flying object 3a. This backscatter light 104 is shown in FIG.

Now, it is assumed that the backscatter light 104 is received by the backscatter light detector 6a through the light receiving window 61a. The backscatter light detection unit 6a photoelectrically converts the received backscatter light 104, and when the converted output exceeds a predetermined threshold value, determines that this is harmful backscatter light and is shown in FIG. Gate signal 6
01a is output and supplied to the gate circuit 7.

The gate circuit 7 which receives the gate signal 601a
Is detected by the detection unit 4 over the generation time of the gate signal 601a.
The output of the detection output 401 output by the above is suppressed to the signal processing unit 5, and as a result, the gate output 701 shown in FIG. 2D of only the target reflected light 103 is transmitted to the signal processing unit 5. This makes it possible to eliminate the influence of backscatter light.

The operation of receiving the backscatter light 104 through the light receiving window 61b is exactly the same as that described above. Further, in the present embodiment, the case where two light receiving windows for receiving the backscatter light are provided on the outer wall of the airframe of the flying object and symmetrically with respect to the axis of the airframe, the light receiving windows are provided depending on the operation purpose. Further, it is possible to set an arbitrary number such that four are arranged by adding vertical symmetry.

[0022]

As described above, according to the present invention, a dead time zone is provided for a light receiving input of backscatter light with respect to a pulsed laser irradiation light for irradiating a target in a flying body guidance device operated by a semi-active system. As a result, the target position can be accurately detected without being affected by the backscatter light, and the laser irradiation device and the flying object (guide device) can be used.
This has the effect that the limitation on the installation distance between and can be removed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a guidance device according to an embodiment of the present invention.

FIG. 2 is a waveform diagram of main signals of the guiding device 2a shown in FIG.

FIG. 3 is a conceptual diagram for explaining induction of a semi-active method.

FIG. 4 is a block diagram showing a configuration of a conventional guidance device.

5 is a waveform diagram of main signals of the guiding device 2 shown in FIG.

[Explanation of symbols]

 1 Laser Irradiator 2, 2a Guiding Device 3, 3a Flying Object 4 Detector 5 Signal Processor 6a, 6b Backscatter Light Detector 7 Gate Circuit 101 Pulsed Laser Irradiation Light 102 Target 103 Target Reflected Light 104 Backscatter Light 105 Laser Incident light

Claims (3)

[Claims] 1. A target of the flying object while capturing reflected light from the target of pulsed laser irradiation light emitted toward the target from a laser irradiation device mounted on the flying object and spaced apart from the flying object. In a guidance device that operates in a semi-active system that guides the light toward a target, the backscatter light, which is the reflected scattered light of the pulsed laser irradiation light by minute scatterers of water and dust existing in the propagation space of the pulsed laser irradiation light, is received. A guide device comprising backscatter light suppressing means for providing a dead time zone for processing and eliminating the influence of the backscatter light. 2. The backscatter light suppressing means receives and detects the backscatter light from any one of at least two light receiving windows that are symmetrically arranged on a side wall of the airframe of the flying object and symmetrically with respect to the airframe, The guidance apparatus according to claim 1, wherein a time gate is set based on the detection output to suppress signal processing of the backscatter light input together with the reflected light from the target. 3. The flying object while capturing reflected light from the target of pulsed laser irradiation light that is radiated toward a target from a laser irradiator mounted on the flying object and spaced apart from the flying object. In a guidance device that operates in a semi-active method for guiding toward, a detection unit that receives the pulsed laser reflected light, photoelectrically converts it, and sends out a detection output,
Signal processing means for sending the guidance output for determining the direction of the target based on the detection output and guiding the flying object toward the target, and water and dust present in the propagation space of the pulsed laser irradiation light. The backscatter light, which is the reflected and scattered light of the pulsed laser irradiation light by the minute scatterer, is received by any one of at least two light receiving windows provided in the flying object, and is detected to generate a gate signal by a pulse having a predetermined characteristic. An induction device comprising: backscatter light detecting means for outputting; and gate means for suppressing transmission of the detection output to the signal processing means by the gate signal in a time zone corresponding to the pulse width of the gate signal. .