JP2557989B2 - Proximity fuse device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a radio-light composite near fuze device.

The radio wave / light wave composite proximity fuze device according to the present invention is mounted on a flying object, and projects a radio wave projection beam and a light wave projection beam onto an intruding target object so that the intruding high-speed small target object is transmitted from the target object. It detects the reflected wave and reflected light of the and sends out a detection signal, eliminates the influence of radio wave interference and light wave interference and reflected light at low altitude, and improves the detection ability of the target object at low altitude flight, It is possible to detect the existence direction of the target object.

[Prior Art and Problems to be Solved by the Invention]

In general, the active light wave proximity fuze is adapted to output an ignition signal when the reflected light from the target object having the same wavelength as the projected beam light is received by the light receiver with a predetermined intensity or more.

Therefore, when sunlight, reflected light from the ground surface, interference light, or the like enters the light receiver, there is a possibility of malfunction due to generation of signal output of the light receiver.

Therefore, in order to prevent malfunction, there are methods such as projecting pulsed light and using a Doppler frequency proportional to the relative moving speed due to coherence. However, when strong light such as sunlight or disturbing light suddenly enters the field of view. The operation is uncertain due to the saturated state of the photoreceiver, and in extreme cases, there is a possibility of causing accidental explosion or misfire.

Further, at low altitude flight, it is difficult to suppress the reflected light from the sea surface and the ground surface, which adversely affects the detection of the target object.

In general, an active radio wave proximity fuse receives a reflected wave of a target object that has penetrated a projection beam of radio waves by a receiver, demodulates and detects the reflected signal, and detects a drive frequency component corresponding to the relative speed difference with the target object. Then, an ignition signal is sent out. (For example, Jikkou Sho 62-37
No. 41) This type of proximity fuze has a single-frequency transmission output, so it is easy to find that it is emitting radio waves to the enemy side, and is easily affected by jamming. There is a problem that it cannot be detected.

In addition, there is a problem in that at the time of low altitude flight, a reflected wave from the sea surface or the ground surface causes malfunction, or the receiving system is saturated.

It is an object of the present invention that the light wave target detector uses the clutter control signal from the clutter controller and inputs it to the driver circuit and the receiving circuit of the projector to variably attenuate the output of the projection light and the output of the light receiver. This suppresses unnecessary reflected light such as sunlight from the sea surface and the ground surface at low altitude,
It is an object of the present invention to provide a radio-wave composite proximity fuze device capable of appropriately detecting a target object at a low altitude.

Another object of the present invention is to make it less susceptible to interference radio waves by using a modulation signal, but by using a lightwave target detector to ensure reliable operation and to prevent sunlight and interference light. The purpose is to improve the anti-jamming characteristics of the active proximity fuze by operating the target detector effectively and complementing the functions of the radio system and the lightwave system.

[Means for solving the problem]

According to the present invention, a plurality of quadrants are provided, and an antenna unit for projecting a fan beam set to an optimum angle of a radio wave is provided, and a radio wave target detection unit for detecting a target reflected wave from the antenna unit, a plurality of quadrants. About the light wave target detection unit that projects the light from the projector and receives the reflected light from the target object to detect the target reflected light from the light receiver, the clutter control that receives the clutter signal from the radio wave target detection unit and generates the clutter control signal Section, a light wave signal comparing section for receiving detection signals of a plurality of quadrants from the radio wave target detecting section and comparing with output signals of respective quadrants, and receiving a plurality of quadrant detection signals from the light wave target detecting section, respectively. The quadrant in which the target object exists by holding the respective output signals from the radio wave signal comparison unit, the radio wave signal comparison unit, and the light wave signal comparison unit for comparison with the output signal of the quadrant A quadrant determination unit for making a determination, an ignition timing circuit for sending an ignition timing signal according to the output of the quadrant determination unit and a relative velocity signal from the outside, and, when the altitude of the flying object becomes smaller than a predetermined value, The output of the light wave projected from the projector using the control signal from the clutter control unit is reduced by the driver circuit which is the power supply for the light wave element, and the light receiver corresponding to the projected beam on the ground side as seen from the projectile of the fan beam. A proximity fuze device having a function of controlling and reducing an output by an optical receiver for amplifying an output signal from the device.

[Work]

Projection of an active radio wave target detection unit and a light wave target detection unit capable of detecting an intruding target object by dividing the entire circumference around the axis of a flying object into four quadrants or more quadrants Tilt the beam forward at each set angle, suppress the reflected wave and reflected light from the sea surface and the ground surface using the clutter control signal of the radio wave target detection unit,
It detects small target objects that enter at low altitude and high speed, and detects the direction of existence of the target object by radio wave and light wave methods.

Further, it is possible to perform detection in which the adverse effect of the interfering wave is eliminated by using a four-quadrant target detection unit using spread code modulation or millimeter wave technology.

〔Example〕

FIG. 1 shows a radio wave / light wave composite proximity fuze device as one embodiment of the present invention. The radio wave / light wave composite fuze device shown in FIG. 1 is composed of an active type radio wave target detection unit 1 and a light wave target detection unit, and has the same omnidirectional direction around the axis of a flying body or the like. 4 quadrants, or
The existence direction of the target object in the quadrant beyond that is detected. Here, the description will be given by taking the 4-quadrant detection as an example.

The light wave target detection unit 2 projects four fan beams in the four quadrant directions through the optical system lenses to the projectors 25 to 28 in a cone shape through the optical system lens, and reflects the reflected light of the target object in the same direction as the fan.・ Receiver 21-24 with beam configuration
A device capable of detecting the presence direction of the invading target object around the entire circumference by (for example, a silicon photodiode) is used.

The radio wave target detection unit 1 detects the intruding target object in the quadrant direction using the four quadrant / target detection unit, and suppresses the clutter reflection signal by the clutter control unit or the like with respect to the reflected waves from the sea surface and the ground surface, and the target. Use a device that can detect objects.
In addition, with respect to the interfering wave, it is made difficult for the enemy side to detect or interfere with the signal by using the spread modulation encoding or the device using the resonance absorption band of the millimeter wave. (See, for example, Japanese Patent Application Nos. 63-154967 and 63-176484 of the applicant of the present application.) As shown in FIG. 2, the projection beam of radio waves and light waves is a projection beam of radio waves that is tilted in the forward direction of a flying object or the like. And a projection beam of a light wave is projected in a cone shape in all circumferential directions in which angles (θ ₁ , θ ₂ ) are set in _two directions. beam,
The angle is the ease of forming the lightwave and radiowave projection beam,
An angle suitable for the relative speed with respect to the target object is set in consideration of the response characteristics of the signal processing.

The angles θ ₁ and θ ₂ of the radio beam projection beam and the light wave projection beam are illustrated and described in FIG. The left side of FIG. 3 shows the radiation pattern radiation state of the radio wave beam, and shows that the angle formed by the radiation pattern formation surface by the radio wave beam and the antenna forming surface mounted on the surface of the flying object is set to θ _1. The right side of FIG. 3 shows that the emission surface of the projection beam of the light wave beam is mounted on the surface of the flying object and the angle formed with respect to the formation surface of the semiconductor laser and the optical system lens is set to θ ₂ .

Each detection beam of radio wave and light wave is configured in the quadrant shown in FIG. 4, and the detection signal of the target object of each detection beam is compared with the threshold level set value in the radio wave target detection unit and the light wave target detection unit, and more than that. When the beam signal is detected, it is sent to the radio wave signal comparison unit or the light wave signal comparison unit.

The radio wave and light wave signal comparators use a detection beam signal (radio wave: beams 1 to 4, light wave: beams 1 to 4) and a comparator circuit which is normally used as a pair of adjacent quadrant signals. The signal levels are compared, and the target detection beam signals of the radio wave and light wave systems are sent to the quadrant decision unit as binary signals.

The clutter control section compares the threshold level with the clutter gate signal of the correlation filter module in the target detection section according to Japanese Patent Application No. 63-176484, and if the signal is higher than the threshold level, the signal is It is integrated by the integrator and sent as a clutter control signal to the voltage controlled oscillator in the pseudo random noise signal (PN signal) generator to control the clock speed of the PN signal generator,
The detection distance corresponding to the altitude from the sea surface or the ground surface in the low altitude of the flying object is changed.

The configuration of the clutter control unit 3 shown in FIG.
As shown in the figure. Using the clutter gate signal S _CT from the correlation filter module 31 in the radio wave target detection unit 1,
It compares with the threshold level value in the comparator 32 of the clutter control section, and if it is higher than the threshold level value, it is sent to the integrator 33 and is integrated and integrated as a clutter control signal voltage corresponding to the altitude of the radio wave target detection section. The signal is sent to the voltage control circuit, the driver circuit (1, 2) of the light wave target detection unit, and the receiving circuit (1, 2).

As the frequency of the voltage control generator in the PN signal generator increases, the 1-bit cycle of the PN signal generator becomes shorter. The round-trip distance of the radio wave corresponding to this becomes short, and by forming a tracking loop with the reflected wave from the sea surface or the ground surface, this tracking distance will automatically change according to the flying height of the flying object. This tracking loop is tracked by a downward beam of the flying object, in this case, beam 1 or 2.

As the clutter control signal used here, the control signal can be used as long as it is a method capable of separating the reflected wave from the sea surface or the ground surface and the target without using the above method.

The clutter control signal is sent to the light wave target detection unit 2, and the semiconductor laser driver circuits 251, 261 and the optical receiver 2 are sent.
Input to the amplifier in 11,221.

The clutter control signal input to the driver circuit (1, 2) controls the projection output of the downward projection beam (1, 2) of the flying object, and synchronizes with the clutter tracking loop of the radio wave system to project according to the altitude. Change the effective distance of the beam. As a result, the detection distance range in the ground surface direction is automatically changed according to the flight altitude, and the influence of clutter reflected light from the sea surface and the ground surface is reduced.

The clutter control signal input to the receiving circuit (1, 2) controls the input signal amount to the receiving circuit of the detection signal of the reflected light input to the light receiver (1, 2) in the downward direction of the flying object. Similarly, a strong input signal due to the projection beam light from the sea surface and the ground surface depending on the altitude and sunlight or interference light is attenuated to avoid a momentary saturation state or malfunction (see FIG. 9).

The configuration of the signal comparison units 4 and 5 is shown in FIG. The signal comparison unit used for the radio wave and the light wave is composed of a normally used comparator circuit as shown in FIG. 6, and compares the output signal levels of adjacent beams, for example, with the beam (4),
The signal levels of the beam (1) are compared. If the DC voltage of the beam (4) is high, the output of the comparator (2) is a binary signal “0” output signal, and if the beam (1) is high, the output signal “ 1 ”is sent to the quadrant determiner 6. Similarly, beam (2) and beam (3) are comparators (1), beam (4) and beam (3) are comparators (3), and beam (1) and beam (2) are comparators (4). And are sent to the quadrant decision unit 6 as respective binary signal outputs.

The quadrant determination unit 6 uses the latch signal from each target detection unit.
The target detection beam signals by radio waves and light waves are held by S _LEM and S _LL , the existence quadrant of the target is judged by the signal holding state as shown in FIG. 7, and the existence quadrant signal is sent to the detonation timing circuit 8.

Here, the clutch signal is a signal generated by using, as a trigger pulse, a momentary detection signal for detecting the target in the target detection unit.

In the quadrant determination unit 6, the output of the target object reflection signal from the correlation filter module in the radio wave target detection unit 1 is used as a trigger signal, and the output of the target object reflection signal of the optical receiver in the light wave target detection unit 2 is output. Is sent to the quadrant decision unit as a trigger signal. This trigger signal, radio wave and light wave beam either to be generated when the detection signal at the moment of detecting the target object is input as a trigger pulse of the latch signal S _LEM, S
_LL is sent to the quadrant determination unit 6 and comparators (1) to (4)
Holds the binary signal from. As in the example shown in FIG. 8, the existence quadrant of the target signal is determined based on the holding state of the binary signal output from the radio wave and light wave type signal comparison unit. For example,
If the target object exists in the quadrant IV, the outputs of the comparators (1) and (2) will be “0”, and the outputs of the comparators (3) and (4) will be “1”. Output.

The relationship between the comparator output and the existing quadrant for each quadrant is as shown in FIG.

The detonation timing circuit 8 controls the existence quadrant signal by using a relative velocity signal V _C or the like from an external device so that the projectile of the warhead hits the target object with certainty, and sends an ignition timing signal in the target existence direction to the warhead. .

The situation of incident beam light from the sea surface and the ground surface, and sunlight, or interference light on the light receiver is illustrated in FIG.

〔The invention's effect〕

The light wave target detection unit inputs the driver circuit and the receiving circuit of the projector using the clutter control signal from the clutter control unit, and variably attenuates the output of the projection light and the output of the light receiver, thereby Unnecessary reflected light such as sunlight from the ground surface is suppressed, and target detection at low altitude is properly performed.

In addition, the interference signal is made less susceptible to the modulated signal (PN), but by using the light wave target detection unit, it can be operated reliably, and the sunlight and the interference light are not affected. The target detection unit is effectively operated, the functions of the radio wave system and the light wave system are complemented, and the anti-jamming property of the active proximity fuze device is improved.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a radio wave / light wave composite proximity fuze device as an embodiment of the present invention, and FIG. 2 is a view in which a radio wave / light wave projection beam is tilted by a specific angle to detect an intruding target object. FIG. 3 is a diagram for explaining the projection states of the radio wave beam and the light wave beam in FIG. 2, and FIG. 4 is a pattern in each quadrant of each detection beam by the radio wave / light wave system in FIG. FIG. 5 is a diagram showing the configuration of the clutter control unit in the apparatus of FIG. 1, FIG. 6 is a diagram showing the configuration of the signal comparison unit in FIG. 1, and FIG. 7 is the target of the radio wave system and the light wave system, respectively. FIG. 8 is a diagram showing the determination of the existence quadrant, FIG. 8 is a diagram showing the output signal waveform of the signal comparing unit in FIG. 6, and FIG. 9 is a diagram showing a situation in which interference requirements are added to the device of the present invention. 1 ... Radio wave target detection unit, 2 ... Light wave target detection unit, 3 ... Clutter control unit, 4 ... Radio wave signal comparison unit, 5 ... Light wave signal comparison unit, 6 ... Quadrant determination unit, 7 ... Relative Speed signal, 8 ... Explosion timing circuit, 10 ... Target object.

Claims (1)

(57) [Claims] 1. An antenna section which is formed in a plurality of quadrants and projects onto a fan beam set to an optimum angle of a radio wave,
A radio wave target detection unit for detecting a target reflected wave from the antenna unit, a light wave target detection unit for detecting a target reflected light from a light receiver for projecting light from a projector for a plurality of quadrants and receiving a reflected light from a target object, A clutter control unit that receives a clutter signal from a radio wave target detection unit and generates a clutter control signal, and a radio wave signal comparison unit that receives detection signals of a plurality of quadrants from the radio wave target detection unit and compares them with output signals of each quadrant , A light wave signal comparison unit that receives the detection signals of a plurality of quadrants from the light wave target detection unit and compares them with the output signals of each quadrant, and holds the respective output signals from the radio wave signal comparison unit and the light wave signal comparison unit The quadrant judging section for judging the quadrant in which the target object exists in accordance with the above-mentioned state, and the ignition timing signal is sent by the output of the quadrant judging section and the relative speed signal from the outside. An explosion timing circuit is provided, and when the altitude of the flying object becomes lower than a predetermined value, the output of the light wave projected from the projector using the control signal from the clutter control section is used as a power source for the light wave element driver circuit. Proximity fuze that has a function of controlling and reducing the output by an optical receiver that amplifies the output signal from the photoreceiver corresponding to the projection beam on the ground side when viewed from the projectile of the fan beam. apparatus.