JP2557976B2 - Proximity fuse device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a proximity fuze device using radio waves and light waves. The device according to the present invention performs flight while a projectile having a warhead detects a target object on a flight course,
It can be used as a proximity fuse for supplying an ignition signal for detonating a warhead based on the result of detection of the target object.

[Prior art and problems to be solved by the invention]

Generally, the active light wave proximity fuze device is configured to generate an ignition signal when the reflected light having the same wavelength as the projected beam light is received by the light receiving device with a predetermined intensity or more. Therefore, when sunlight or interfering light is received, there is a problem that malfunction may occur due to the output of the light receiving device.

Therefore, in order to prevent the above-mentioned malfunction, a method of projecting pulsed light, a method of using a Doppler frequency proportional to the relative speed of coherent light, and the like are conceivable. If it suddenly enters the field of view, the light receiving device becomes dazzled (blindness) and the operation becomes uncertain. In extreme cases, it may cause misfire or misfire of the warhead. In addition, it is difficult to suppress the reflected light from the sea surface and the ground surface at low altitude, which adversely affects the target detection.

In addition, the active radio wave proximity fuze device receives a reflected wave from the target that has entered the projection beam of the radio wave by the receiving device, demodulates and detects the received reflected signal, and the Doppler frequency component corresponding to the relative velocity with the target. Is detected and an ignition signal is generated. This is described in, for example, Japanese Utility Model Publication No. 62-3741. The ignition method of this active radio wave proximity fuze device is that the transmission output has a single frequency, so that it is easy to be detected by the other party that it is emitting radio waves, and it is easy to be disturbed, and it is not possible to detect the target presence direction. There is a problem. In addition, there are problems such as malfunction due to reflected waves from the sea surface or the ground surface, and saturation of the receiving device.

An object of the present invention is to compare a received radio wave detection beam detected in a receiving device with a threshold setting value, compare a received light detection beam detected in a light receiving device with a threshold setting value, and determine a quadrant based on the comparison result, ignition timing. Make sure that decisions are made and that the interference is prevented by the light-receiving device, and that the sunlight and jamming light are prevented by the receiving device, so that the functions of both devices are mutually assisted. In addition, it is intended to prevent the malfunction of the receiving device and the light receiving device due to the reflection from the sea surface or the ground surface at the time of low altitude flight to improve the accuracy of the operation of the proximity fuze device.

[Means for solving the problem]

According to the present invention, a transmitting antenna and a transmitting device that emit radio waves in the form of a projection beam having an inclination in the flight direction of a flying object, receive reflected radio waves related to a predetermined quadrant, and detect the received reflected radio waves. A receiving antenna and a receiving device for performing, a correlation filter module unit for performing a correlation process on an output signal of the receiving device, a light projecting device for radiating light in the form of the projection beam having an inclination in a flight direction of a flying object, a predetermined quadrant A light receiving device that receives reflected light regarding the received light, detects the received reflected light, and a received radio wave detection beam and a clutter control signal that are detected by the receiving device and are correlated and output by the correlation filter module section with threshold setting values. Compared with the radio wave method, a comparison device that compares the received light detection beam detected by the above light receiving device with the threshold setting value A PN modulation signal generator that controls the clock speed by a voltage controlled oscillator that controls the clutter control signal compared and integrated by the comparison device, and control of the clock speed is performed in the PN modulation signal generator. A voltage-controlled oscillator configured to control the voltage at a frequency corresponding to the clock speed for transmission, and a quadrant target detector for detecting the quadrant direction. Regarding the detection signal, in the radio wave method, the output signal of the receiver is passed through the correlation filter by the signal of the beam (1 to 4) after being correlated with the PN modulation signal, and in the optical method, the beam (quadrant I Or IV) signal, comparing the threshold signal level paired adjacent quadrants in the target detection comparison device, to determine the target detection quadrant, And a quadrant determination / ignition timing circuit that outputs an ignition timing signal in the target presence direction by using a relative speed signal from an external device, and the quadrant determination / ignition timing determination determines the interfering radio wave by a light receiving device. The present invention provides a proximity fuze device, characterized in that interference is prevented by the receiver and interference is prevented by the receiver.

〔Example〕

FIG. 1 shows a proximity fuze device using radio waves and light waves as one embodiment of the present invention. The proximity fuze device shown in FIG. 1 includes a radio wave transmitter / receiver 1, an optical transmitter / receiver 2, a correlation filter module 3, a target detection / comparison device 4, and a quadrant determination / ignition timing circuit 5.

Fig. 1 Proximity fuze equipment is provided with an active light wave proximity fuze equipment and an active radio wave proximity fuze equipment, and targets in four or more quadrants in the same omnidirectional direction around the axis of a flying vehicle etc. The direction of existence can be detected.

In FIG. 1, in the proximity fuze device, the active light wave proximity fuze device uses, for example, semiconductor lasers 221 to 224 in the light projecting device 22 to project four fan beams in four quadrant directions through an optical system such as a lens, The target reflected light is detected by the light receiving device 21 having a fan beam configuration in the same direction as the target reflected light, for example, a silicon photodiode, in the target presence direction in the entire circumference.

Fig. 1 In the proximity fuze device, the active radio wave proximity fuze device detects an intrusion target in the quadrant direction by using a 4-quadrant / target detector. Further, the clutter reflection signal is suppressed by a clutter target loop for reflected waves from the sea surface and the ground surface (Japanese Patent Application No. 63-15
See 4967).

As shown in Fig. 3, the projection beams of radio waves and light waves are tilted in the forward direction of the flying object, etc., and the angles of the projection beam of radio waves and the projection beam of light waves are set in the τ ₁ and τ ₂ directions, respectively, and the entire circumference is surrounded. It projects in a conical shape in the direction. The angle of the beam is set to an angle suitable for the relative velocity with respect to the target in consideration of response characteristics such as signal processing of the active light wave and the active radio wave proximity fuze.

Each detection beam of radio waves and light waves is composed of the quadrant shown in FIG. 2, and the target detection signal of each detection beam is the target detection signal.
It is sent to the comparison device 4 and compared with the threshold level set value.

The detection beam signals above the threshold level, that is, the radio wave beams 1 to 4 and the light wave beam quadrants I to IV, compare the signal levels of pairs of adjacent quadrants to clarify the detection quadrant range.

The clutter gate signal of the correlation filter module unit 3 is compared with the threshold level, and if the signal is higher than the threshold level, it is integrated by an integrator, and one of the clutter control signals is a PN modulation signal generator.
It is sent to the voltage controlled oscillator in 13 to control the clock speed of the PN modulation signal generator 13 to reduce the detection distance. For modulation
A PN modulated signal is used.

The other clutter control signal is the driver circuit No. 1 to No. 2 of the semiconductor laser of the active light wave proximity fuze, that is, 231,
232 to reduce the projection output of the light projecting devices 221 and 222.

The clutter control signal input to the driver circuits 231 and 232 is synchronized with the clutter tracking loop of the radio wave system. In this case, the projection output of the downward fan beam (quadrant I) and (quadrant II) of the projectile is output. Will be in control.
This makes it possible to automatically change the detection distance range according to the altitude of low-flying air, and reduce the influence of clutter reflected light from the sea surface and the ground surface.

When the frequency of the voltage-controlled oscillator in the PN modulation signal generator 13 rises, the 1-bit cycle of the PN modulation signal generator 13 becomes shorter, and the round trip distance of the radio wave corresponding to this becomes shorter, causing reflection from the sea surface or the ground surface. By forming a wave tracking loop,
This tracking distance will automatically change according to the flying height of the flying object. This tracking loop is caused to track by a downward beam of the spacecraft, in this case quadrant I or quadrant II.

The quadrant determination / ignition timing circuit 5 holds the target detection signal of each quadrant of the active radio wave and the active light wave proximity fuze, determines the target detection quadrant, and uses the relative velocity signal from an external device to ignite the target existence direction. Output a signal.

FIG. 1 In the proximity fuze device, an active radio wave proximity fuze device and an active light wave device that can detect an intruding target object by dividing the entire circumference centered on the axis of a flying body into, for example, four quadrants The projection beam of the proximity fuze device is tilted forward to each set angle, and the clutter control signal is used to suppress the reflected waves from the sea surface and the ground surface, and it is possible to detect a small target entering at a high speed at a low altitude. Is performed, and it is accurately detected from the target existence direction.

As described above, in the proximity fuze device of FIG. 1, since the active radio wave proximity fuze spreads the transmitted wave in the spectrum, the transmission power density per unit frequency band is suppressed to a low level, so that it is discovered on the enemy side. It is difficult, and even if the interference is received, the correlation is taken inside the proximity fuze device, so that there is no influence on the interference on the enemy side who does not know the modulation code of the PN modulation signal.

Also, the effective target detection range of the proximity fuze device can be set by the PN modulation code, the round trip distance of the radio wave can be set, the target detection range can be matched with the effective range of the warhead, and the target can be seen from the flying object. The quadrant can be determined in which direction.

Further, the clutter control signal suppresses reflected waves from the sea surface and the ground surface, and enables target detection at low altitude.
By using the clutter control signal in the driver circuit of the active light wave proximity fuze device to variably attenuate the output of the projected light, it becomes possible to control the reflected light from the sea surface and the ground surface at low altitude.

In addition, for interference waves, it is not easily affected by spread spectrum, but it must be operated reliably by the active light wave proximity fuze device, and for active sunlight and interference light, the active wave proximity fuze device should operate effectively. As a result, the respective functions are complemented to each other, and the proximity fuze device is resistant to interference.

As described above, in the proximity fuze device of FIG. 1, by integrating the active radio wave and the active light wave proximity fuze device, the detection capability is improved by using the functions and characteristics of the small target at high speed invading at low altitude. Be improved.

〔The invention's effect〕

According to the present invention, the received radio wave detection beam detected in the receiving device is compared with the threshold setting value, the received light detection beam detected in the light receiving device is compared with the threshold setting value, the quadrant determination based on the comparison result,
Ignition timing is determined, interference from interference waves is prevented by the light receiving device, sunlight and interference light is blocked by the receiving device, the functions of both devices are mutually assisted, and the proximity fuze The accuracy of the operation of the device can be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing a proximity fuze device as one embodiment of the present invention, FIG. 2 is a diagram for explaining the state of formation of a radio wave detection beam and a photo detection beam in each quadrant, and FIG. It is a figure explaining beam projection. [Explanation of Codes] 1 ... Radio wave transmitter / receiver, 11 ... Reception device, 111,112 ... Reception antenna, 12 ... Transmission device, 121,122 ... Transmission antenna, 13 ... PN modulation signal generator, 2 ... Optical transmission / reception Part, 21 ... light receiving device, 22 ... light emitting device, 23 ... driver circuit, 3 ... correlation filter module part, 31,32 ... correlation filter, 4 ... target detection / comparison device, 5 ... quadrant Judgment and ignition timing circuit.

Continuation of front page (56) References JP-A-63-83600 (JP, A) JP-A-64-91080 (JP, A)

Claims (1)

(57) [Claims] 1. A transmitting antenna and a transmitting device for emitting radio waves in the form of a projection beam having an inclination in the flight direction of a flying object, receiving reflected radio waves in a predetermined quadrant, and detecting the received reflected radio waves. Receiving antenna and receiving device, correlation filter module section that performs correlation processing on the output signal of the receiving device, projecting device that emits light in the form of the projection beam having an inclination in the flight direction of the flying body, and related to a predetermined quadrant A light receiving device that receives reflected light and detects the received reflected light, and compares the received radio wave detection beam and the clutter control signal that are detected by the receiving device and are correlated and output by the correlation filter module section with a threshold setting value. Then, the comparison device that compares the received light detection beam detected by the above light receiving device with the threshold setting value A PN modulation signal generator that controls the clock speed by a voltage controlled oscillator that controls the clutter control signal that is compared and integrated by the comparison device, and the clock speed control is configured in the PN modulation signal generator. The voltage controlled oscillator controls the voltage corresponding to the clock speed and transmits it, and the target detector of multiple quadrants detects the direction of the quadrant, and the beam detection of multiple quadrants of the radio system and the optical system. Regarding the signal, in the radio wave system, the output signal of the receiving device is passed through the correlation filter by the signal of the beam (1 to 4) after being correlated with the PN modulation signal, and in the optical system, the beam as the output signal from the light receiving device (quadrants I to 4). IV) signal, the target detection quadrant is compared by comparing the threshold signal levels of adjacent quadrants in the target detection and comparison device as a pair, A quadrant determination / ignition timing circuit that outputs an ignition timing signal in the target presence direction using a relative speed signal from an external device. The proximity fuze device is characterized in that the interference is prevented by the receiver and the receiver prevents the interference by the interference light.