JPH03221799A - Proximity fuse device - Google Patents

Abstract

PURPOSE:To securely detect the direction of the existence of a target object by providing an electric wave target detector and a light beam target detector outputting detection signals for each quadrant, control means for cancelling out the influence due to reflected waves and reflected light from the sea surface or the gorund surface, and a circuit for deciding an existence quadrant. CONSTITUTION:An electric wave target detector 10 outputs detection signals E1-E4 for each quadrant, and a detection signal using a downward electric wave beam is controlled by a clutter controller 14 such that an influence by reflected waves from the sea surface or the ground surface is cancelled out. Similarly, a light wave target detector 11 outputs detection signals L1-L4 for each quadrant, and each detector signal is controlled by a clutter controller 14. The detection signals are each compared with threshold level set values in the electric wave target detector 10 and the light wave target detector 11, and if they exceed the set values, they are sent to a quadrant decision means 16 as binary signals. The quadrant decision means 16 holds target detection beam signals by an electric wave and a light wave, and decides an existence quadrant of a target object, and a resulting signal is sent by a triggering timing circuit 17.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a proximity fuze device, and more specifically, it is mounted on a projectile carrying ammunition, and when the projectile approaches a target object, the fuse The present invention relates to a device for commanding the ignition operation of ammunition.

[Prior Art and Problems to be Solved by the Invention] There are various types of the above-mentioned proximity fuse devices, such as a light wave type and a radio wave type.

Among these, the light wave proximity fuze device outputs an ignition signal when a light receiver receives reflected light from a target object having the same wavelength as the projected beam light with a predetermined intensity or more.

Therefore, when direct incident light from sunlight, reflected incident light from the ground or sea surface, or interference light from other light emitting sources enters the receiver, a signal output that becomes the receiver is generated. There is a possibility that the subsequent circuit after the light receiver malfunctions.

In addition, in order to prevent this malfunction, methods have been proposed, such as a method of intermittently projecting a projection beam light in the form of pulses, and a method of using a Doppler frequency proportional to the relative movement speed of coherent light. When strong light such as light or interference light suddenly enters the receiver, the receiver enters a so-called "saturated state" and its operation becomes uncertain, which in extreme cases may cause false explosions or misfires. There are drawbacks.

Furthermore, when flying at low altitude, the distance between the sea surface or the ground surface and the flying object is relatively short, so the response of the circuit operation to suppress the reflected light from the sea surface or the ground surface is not in time, resulting in Another drawback is that the reflected light cannot be suppressed, which affects target object detection.

On the other hand, a radio proximity fuze device uses a receiver to receive the reflected wave from a target object that has entered the radio wave projection beam, demodulates and detects the reflected wave signal, and generates a Doppler frequency component corresponding to the relative speed difference with the target object. It is designed to detect and send an ignition signal.

An example of this technique is disclosed in, for example, Japanese Utility Model Publication No. 62-3741.

In this method, since the transmission output is a single frequency, it is easy to detect that the other party is emitting radio waves, and it is also susceptible to interference waves. The drawback is that it cannot be detected accurately.

Furthermore, when flying at low altitudes, there is a problem that reflected waves from the sea or ground surface may cause malfunctions or saturation of the receiving system.

In view of these circumstances, a hybrid type proximity fuze device that combines a radio wave type and a light wave type has been proposed. This system predicts radio or light wave interference depending on the battlefield conditions and switches the state selection gate using a detection ignition mode setting circuit to avoid being affected by interfering radio waves or light waves in the battlefield. An example of this technique is disclosed in, for example, Japanese Patent Laid-Open No. 6383600.

In the case of this radio wave/light wave composite proximity fuse device, if the selected state is against interference waves based on a previously predicted selection state, for example, radio wave interference waves, it is possible to prevent malfunctions due to interference waves against radio wave interference, but light wave interference However, there is a problem in that malfunctions occur due to interference waves.

The present invention was created in view of the problems in the prior art, and an object of the present invention is to provide a proximity fuse device that can reliably detect the direction in which a target object exists without causing malfunction.

[Means to solve the problem]

In order to solve the above problems, the present invention adopts a composite method that combines radio wave type and light wave type detectors,
We are trying to take advantage of the advantages of each.

Therefore, according to the present invention, there is provided a device that is mounted on a flying object carrying an ammunition and instructs the ignition operation of the ammunition when the projectile approaches a target object, the device comprising: A radio wave beam is projected in a cone shape at a predetermined set angle toward the front of the flying object in each quadrant of at least four quadrants divided in a direction, and a reflected wave from the target object with respect to the projected beam is detected. A radio wave target detector that outputs a radio wave detection signal according to the signal strength for each quadrant; - a lightwave target detector that detects the reflected light from the target object toward the target object and outputs a lightwave detection signal according to the signal strength for each quadrant; and means for controlling the radio wave detection signal and the light wave detection signal so as to cancel out the effects caused by reflected light;
a circuit for determining the quadrant in which the target object exists based on a comparison of the controlled radio wave detection signal and light wave detection signal with a predetermined reference value, and for commanding the ignition operation based on the determined result. A proximity fuze device is provided.

(Function) According to the above-mentioned configuration, the target detectors of the radio wave type and the light wave type are combined, and the influence of the reflected waves and reflected light from the sea surface or the ground surface is canceled out, so that the target detector is It becomes possible to reliably detect in which quadrant direction an object exists. In particular, unnecessary reflected signals from the sea surface or ground surface can be suppressed during low-altitude flight, which is effective in preventing malfunctions.

The details of other features and operations of the present invention will be explained using the embodiments described below with reference to the accompanying drawings.

〔Example〕

FIG. 1 shows the configuration of a proximity fuze device as an embodiment of the present invention.

The proximity fuze device of this embodiment includes a radio wave target detector 10 and a light wave target detector 11 as main components, and the entire circumference is divided into at least four quadrants centered around the axis of the flying object on which this device is mounted. This device is capable of detecting the direction of a target object entering one of the quadrants.

Here, an example of a device divided into four quadrants will be described.

First, the radio target detector 10 uses the transmitting antenna ^5IAS
2 is used to project two radio wave beams in the vertical direction in a cone shape, and the reflected waves of the radio wave beams from the target object are detected by two radio wave beams in the left and right directions using the receiving antennas API and AR2. Four detection beams are formed in four quadrant directions, and detection signals E1 to E4 are outputted in accordance with the received signal strength for each quadrant. Finally, each detection signal is used to determine in which quadrant direction the target object is present. In addition, the detection signal using the downward radio beam is transmitted to the clutter controller 1 so that the influence of reflected waves from the sea surface or ground surface is canceled out.
4.

As for interference waves, a device using a spreading code modulation method or a millimeter wave resonance absorption band is used to make it difficult for the other party to detect or interfere with the interference waves. This technology is disclosed in Japanese Patent Application No. 63-15496 previously filed by the present inventor.
It is disclosed in the specification of No. 7 or Japanese Patent Application No. 176484/1984.

Similarly, the light wave target detector 11 is a light beam projector LSI
~For example, using a semiconductor laser for LS4, 4 in the 4 quadrant direction.
Two fan beams are projected in a cone shape through an optical system lens, and the reflected light from the target object for this light wave beam is sent to an optical receiver (for example, a silicon diode).LRI
- LR4, and outputs a detection signal Ll-L4 corresponding to the received signal strength for each quadrant. Each detection signal is controlled by a clutter controller 14 so that the influence of reflected waves from the sea surface or ground surface is canceled out, and is ultimately used to determine in which quadrant the target object is present. It will be done.

For example, as shown in FIG. 2, the projected beams of radio waves and light waves are tilted in the forward direction of a flying object, etc., and the projected beams of radio waves and light waves are tilted in two directions at angles (
θ1. θ2) and project in a cone shape in all circumferential directions. Note that the beam projection angle is set to an angle suitable for the relative speed with the target object, taking into consideration the ease of forming a projection beam of light waves and radio waves, response characteristics due to signal processing, etc.

Examples of the projection angles θ3 and θ2 of the projection beam by radio waves and the projection beam by light waves are shown in FIG. 3(a), respectively.
, shown in (b). Figure 3 (a) shows the radiation pattern radiation situation of the radio wave beam, and shows that the angle formed by the bottom of the antenna shape attached to the surface of the flying object and the radiation pattern forming surface by the radio wave beam is set to θ1. , the same figure (b) shows that the radiation surface of the projection beam of the light wave beam is attached to the surface of the flying object, and the angle formed with the formation surface of the semiconductor laser and the optical system lens is set to θ2.

The detection beams of radio waves and light waves are, for example, shown in Fig. 4 (
It consists of quadrants as shown in a) and (b).

The detection signal of the target object of each detection beam is compared with a threshold level setting value in the radio target detector lO and the light wave target detector 11, respectively, and when a beam signal exceeding the set value is detected, the respective The signal is sent to a radio signal comparator 12 and a light wave signal comparator 13.

The radio wave and light wave signal comparators 12.13 detect the detection signal E.
Based on 1 to E4 and L1 to L4, signals in adjacent quadrants are considered as a pair, and the signal levels are compared using a commonly used comparator circuit, and each detection signal of radio wave and light wave method is divided into two. Quadrant judger 1 with value signal
Send on 6.

The clutter controller 14 is, for example, disclosed in the above-mentioned Japanese Patent Application No. 63-176.
Clutter gate signals of a correlation filter module (not shown) in the target detector as disclosed in '484 are used to perform a comparison with a threshold level;
If above the threshold level, the signal is integrated by an integrator and sent as a clutter control signal to a voltage-controlled oscillator (neither shown) in the pseudo-random code generator to control the clock speed of the pseudo-random code generator. The detection distance is controlled to vary according to the altitude of the flying object from the sea surface or the ground surface at low altitude.

A voltage controlled oscillator in the pseudo-random code generator shortens the one-bit period of the pseudo-random code generator as the frequency increases. As a result, the round-trip distance of the corresponding radio waves becomes shorter, and by forming a tracking loop based on reflected waves from the sea or ground surface, the tracking distance automatically changes depending on the flight altitude of the projectile. This tracking loop is connected to the downward beam of the projectile (in the example of Fig. 4, El,
E2; Ll, L2) for tracking.

The clutter control signal is generated by the clutter controller 14, which is a radio or light wave target detector that can separate waves reflected from the sea or ground surface and waves reflected from a target object. If available, that control signal may be used instead.

The above clutter control signal is sent to the lightwave target detector 11, and the driver DI corresponding to the lower quadrant of the projectile;
D2 and optical receiver R1,l? It is entered within 2.

The clutter control signal input to the driver circuits DI and D2 controls the projection output of the downward projection beam (first and second quadrants) of the flying object, and synchronizes it with the radio wave clutter tracking loop to adjust the projection output according to the altitude. change the effective distance of the projected beam. This makes it possible to automatically change the detection distance range in the direction of the ground surface depending on the flight altitude, thereby reducing the influence of clutter reflected light from the sea surface or the ground surface.

The crank control signal input to the optical receivers R1 and R2 is
The detection signal of the reflected light input to the downward receiving beam (Ll, L2) of the flying object is controlled, and similarly to the above, the clutter reflected light from the sea surface or the ground surface depending on the altitude (for example, as shown in Fig. 5). Attenuates strong input signals (such as those caused by the projection beam light). This makes it possible to avoid instantaneous "saturation" conditions or malfunctions.

Returning to FIG. 1, the solar controller 15 receives information on the attitude angle (bin, yaw, and roll signals) of the flying object from other devices mounted on the flying object and position information (for example, latitude, longitude, etc.). etc.), and the solar direction information previously input into an internal memory circuit (not shown), such as date, time, latitude,
Compare with the longitude, sun direction, angle, etc., and detect the light wave target detector 1.
It has a function of transmitting a control signal to the optical receivers R1 to R4 in the quadrant direction when the first projection beam is affected by sunlight, and blocking the light reception signal.

At this time, the solar light controller 15 outputs a signal instructing it to be affected by direct incident light from the sun or reflected incident light from the sea surface or ground surface (see FIG. 6).

The signal ratio soft parts used for radio waves and light waves, respectively, are
As shown in FIG. 7, it is composed of a commonly used comparator circuit and compares the output signal levels of adjacent beams. For example, when comparing the signal levels of beam 1 and beam 4, if the DC voltage of beam 4 is higher, the comparator 2 will output a binary signal of "0", and if beam 1 is higher, the output signal will be "1". '' are respectively sent to the quadrant determiner 16. Similarly, beams 2 and 3 are compared by comparator 1, beams 4 and 3 are compared by comparator 3, and beams 1 and 2 are compared by comparator 4, and each binary signal output is sent to quadrant determiner 16. Sent.

The quadrant determiner 16 holds target detection beam signals in the form of radio waves and light waves using the launch signals SL□ and SLL from each target detector 10.11, and detects the target object based on the signal holding state as shown in FIG. The existence quadrant of the detonation timing circuit 17 is determined, and an existence quadrant signal based on the determination result is sent to the detonation timing circuit 17.

Here, the latch signal is a signal generated by generating a momentary detection signal when a target object is detected within the target detector as a trigger pulse. That is, when a detection signal is generated at the moment when a target object is detected in either a radio wave or a light wave beam, it is generated as a trigger pulse, and a launch signal S LEM,
SLL is sent to the quadrant determiner 16 and the comparator 1
Holds the binary signal from ~4.

As shown in FIG. 9 as an example, depending on the holding state of the binary signal output from the radio wave and light wave type signal comparison sections,
Determine the quadrant in which the target object exists.

For example, if the target object exists in quadrant ■, comparator 2
The outputs of comparators 1 and 4 are ``1'', and the outputs of comparators 1 and 4 are ``1''.
”, and this state is determined to be in the existence quadrant ■ and output.

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

Finally, the detonation timing circuit 17 uses the relative velocity signal Vc etc. from other devices mounted on the flying object to ensure that the presence quadrant signal from the quadrant determiner 16 hits the target object. The ignition timing signal in the direction of the 5L1 target object is sent to the warhead.

According to the proximity fuze device of this embodiment configured as described above, the following advantages can be obtained.

(1) Since the radio wave target detector 10 performs direct spread coding modulation on the transmission wave, the transmission power density per unit frequency band is suppressed to a low level. Therefore, it is difficult to be detected by the other party, and even if interference occurs, correlation is taken within the target detector, so there is no effect on interference from the other party who does not know this modulation code (pseudo-random code). I don't accept it.

Also, by using a corrugated wave target detector, Q +)
Propagation loss characteristics due to resonance absorption inherent in waves can be used, making it difficult to be affected by detection or interference from the other party.

(2) The target detection effective range of the radio wave target detector IO can be set based on the oscillation frequency of the transmission modulation code, and the round trip distance of the radio wave can be set, the detection range of the target object can be matched with the effective range of the warhead, and the target It becomes possible to determine in which direction (quadrant determination) the object exists when viewed from the flying object.

(3) The clutter control signal suppresses reflected waves from the sea and ground surfaces, making it possible to detect target objects at low altitudes.

(4) The lightwave target detector 11 inputs the clutter control signal from the clutter controller 14 to the driver DI to 04 of the projectors LSI to LS4 and the optical receivers R1 to R4, and outputs the projected light and the received light signal. By variably attenuating the output, it is possible to suppress unnecessary reflected light from the sea surface and ground surface at low altitudes.

(5) Regarding sunlight, use information on the position and orientation of the flying object and information on the direction of the large intestine stored in advance to avoid receiving light in the direction of that quadrant when the time comes to be affected by sunlight. By controlling each time, "
The possibility of malfunctions due to "saturated" conditions can be eliminated.

(6) Although the modulation code (pseudo-random code) makes it less susceptible to jamming radio waves, the use of the lightwave target detector 11 makes it possible to operate the device reliably. By effectively operating the radio wave target detector 10 against interference light, it is possible to supplement the functions of both radio wave and light wave systems, thereby providing a proximity fuze device with excellent interference resistance. can.

By sealing (7) against high-speed small targets that invade at low altitude using two methods, wave and light wave, and effectively using the functions and characteristics of both methods, it is possible to select and set both methods in advance depending on the battlefield situation. It becomes possible to improve the detection ability of the proximity fuze device without causing any damage.

(Effects of the Invention) As explained above, according to the present invention, since the advantages of each of the radio wave type and light wave type target detectors are effectively utilized, the direction of the target object can be reliably determined without causing malfunction. can be detected.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the configuration of a proximity fuze device as an embodiment of the present invention, 5 Fig. 2 is a diagram showing a radio wave/light wave projection beam, Fig. 3 (a)
and (b) are diagrams showing the beam projection situation, Figures 4 (a) and (b) are diagrams showing the composite reception pattern of the beam, Figure 5 is a diagram showing the state of reflected waves and reflected light, and Figure 6 is a diagram showing the state of reflected waves and reflected light. Figure 7 shows the configuration of the signal comparator in Figure 1. Figure 8 shows the quadrant in which the target object exists and the output of each comparator in the radio wave and light wave systems. FIG. 9 is an output signal waveform diagram of the signal comparator of FIG. 7, which shows the relationship. (Explanation of symbols) 10... Radio wave target detector 511... Light wave target detector, 12... Radio wave signal comparator, 13... Light wave signal comparator, 14... Clutter controller, 15... ...Solar light controller, 16... Quadrant determination device, 17... Detonation tie naming circuit, E1 to E4... Radio wave detection signal, L1 to 1.4.
・・Light wave detection signal, θ θ2 ・・Setting angle.

Claims (1)

[Scope of Claims] 1. A device that is mounted on a flying object carrying ammunition and instructs the ignition operation of the ammunition when the projectile approaches a target object, the device comprising: A radio wave beam is projected in a cone shape toward the front of the flying object at a predetermined set angle (θ_1) in each of at least four quadrants divided in the circumferential direction, and the projected beam is reflected from the target object. A radio wave target detector (10) that detects waves and outputs radio wave detection signals (E1 to E4) according to the signal strength for each quadrant;
Lightwave target detection that projects a lightwave beam in a cone shape at θ_2), detects the reflected light from the target object with respect to the projected beam, and outputs a lightwave detection signal (L1 to L4) according to the signal strength for each quadrant. means (14) for controlling the radio wave detection signal and the light wave detection signal so as to cancel the effects caused by reflected waves and reflected light from the sea surface or ground surface by the radio wave beam and the light wave beam; a circuit (12, 13, 16) that determines the quadrant in which the target object exists based on a comparison of the controlled radio wave detection signal and light wave detection signal with a predetermined reference value; A proximity fuse device characterized in that it commands ignition operation. 2. Compare the position and attitude angle information of the flying object with preset sun direction information, and correspond to the quadrant direction when the projection beam of the light wave target detector is affected by sunlight. Proximity fuze device according to claim 1, further comprising control means (15) for inhibiting detection of reflected light.