JPS6166099A - Proximity fuse - 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 [Technical Field of the Invention] The present invention relates to preventing malfunction of a proximity fuse installed in a guided flying object due to external interference waves.

[Prior art]

FIG. 1 is a diagram showing the configuration of a conventional proximity fuse.

(1) is an antenna that emits a signal into the air and receives the signal reflected by the target aircraft; (2) is a power divider that equally distributes power; (3) is a transmitter that generates a continuous signal; (4) is a combiner that extracts a part of the transmit power, (5) is a duplexer that separates the transmit and receive signals, and (6) is a combiner that mixes the receive signal with a part of the transmit power from the combiner (4). A mixer that produces a Doppler signal, (7) is an amplifier with a predetermined bandwidth, (8) is a detector that detects the Doppler signal, and (9) outputs a signal when the input signal exceeds a predetermined threshold. comparator, (Io is the comparator (
9) is a detonation circuit that generates a detonation signal in response to the signal output by 9), aυ is a safety device to maintain the safety of the warhead,
A is a warhead that explodes upon receiving a detonation signal. Note that the safety device Qυ and warhead a'b are not included in the proximity fuse.

When a guided missile is launched in such a configuration, the transmitter (3) is connected to the coupler (4), the duplexer (5)
), radio waves are radiated from the antenna (1) through the power divider (2). When the target aircraft enters the beam of the antenna (1), the emitted signal undergoes a Doppler shift corresponding to the relative speed of the guided flying object and the target aircraft, and then returns to the antenna (1).
received on the The received signal is.

It passes through the duplexer (5) and is mixed with a part of the signal of the transmission output taken out by the coupler (4) at the mixer (6) to become a Doppler signal.Then it is amplified by the amplifier (7) and then the detector (8). ), where it becomes a pulse signal and enters the comparator (9). The input pulse signal is compared with a predetermined threshold, and if the pulse signal exceeds this threshold, a signal is output. This signal enters the detonation circuit (10), where it is converted into a detonation signal and sent via safety device I to the warhead (12), detonating it.

Conventional devices operate if the magnitude of the received signal exceeds a predetermined value, so they have the disadvantage of being susceptible to malfunctions due to strong interference from the side ropes of the antenna.

[Summary of the invention]

This invention was made to improve such drawbacks, and uses two antennas as antennas for the proximity fuse.
Detects the sum and difference signals of the reflected signals from the target aircraft received by the antennas, and detects the difference signal that occurs when the level of the sum signal is higher than a predetermined value and the target aircraft crosses the difference signal pattern. The purpose of this study is to find the rate of change of , that is, the differential component, and propose a proximity fuze that operates only when both of these exist simultaneously.

The sum and difference patterns created by the two antennas are shown in FIG. In the figure, (13 is the sum signal pattern of the two antennas, I is the difference signal pattern. Also, the difference signal pattern has a phase of 18 on the right and left of the center.
Since the difference is 0°, when the difference signal is phase-detected using the sum signal, the result is as shown in Fig. 3.

Now, when the target aircraft crosses the antenna difference pattern.

Since the phase detection output changes in accordance with the relative speed to the target aircraft, a pulse signal can be obtained by taking its differentiation. If it is set to operate by detecting this pulse signal, it will not be activated by radio waves from other than the center of the antenna pattern. Also.

When the level of the sum signal exceeds a predetermined value, it is possible to prevent malfunctions due to noise and weak signals from a long distance.

[Embodiments of the invention]

FIG. 4 is a diagram showing an embodiment of the present invention.

(3) to α2 are exactly the same as the conventional proximity fuse.

(US is an antenna, αe is a comparator that produces the sum and difference signals of two antennas aS, (l is a power combiner (A) that adds the sum signals produced by two comparators αQ, αE is A power combiner (B) that adds the difference signals produced by two comparators (L [9), and a transmitter (B) taken out from the combiner (4) as well as the mixer (6).
3) A mixer that mixes a part of the output power and the difference signal to create a Doppler signal.Han is an amplifier with a predetermined bandwidth like the amplifier (7), and Qυ is a phase difference signal that mixes the difference signal with the sum signal. A phase detector that detects the wave; (C) is a differentiator that extracts the differential component of the phase-detected signal and outputs a signal when its output exceeds a predetermined threshold; @ indicates that two input signals are present at the same time; It is an AND circuit that outputs a signal only when

In the proximity fuse configured as above, the transmitter (3)
The output power of is the combiner (4) and the duplexer (5).

The sum signal is passed through a power coupler (A) tlη that adds the sum signal, and the sum signal pattern is radiated into the air from the antenna (I!9).The signal reflected by the target aircraft is sent to the antenna u again. !9 received by 2
The signal is divided into sum and difference signals by the comparators a[9. The sum signals are summed by a power combiner (A) 11η and applied through a duplexer (5) to a mixer (6), as in a conventional proximity fuse.
The signal is converted into a Doppler signal by the amplifier (7), and is then amplified by the amplifier (7) and input to the detector (8). The signal detected here is compared with a predetermined threshold value in a comparator (9), and if the input signal exceeds this threshold value, a signal is output.

On the other hand, the difference signal is added by the power combiner (B) QgI, inputted to the mixer (19), and mixed with a part of the power of the transmitter output taken out by the combiner (4) to become a Doppler signal. The signal enters the amplifier, where it is amplified and enters the phase detector Qυ.

The difference signal input to the phase detector 01) is sent to the amplifier (7
) is phase-detected by the sum signal amplified by ), and input to the differentiator.) The two-phase detected signal is differentiated and becomes a pulse signal corresponding to the rate of change, which is then input to the differentiator @ internal threshold value. They are compared and output a signal if the pulse signal exceeds this threshold. If the distance between the target aircraft and the proximity fuse is within the specified value,
In addition, when the pattern of antenna α9 is crossed at a predetermined speed or higher, the difference signal obtained by phase detection and differentiation exceeds the threshold value in the differentiator, so the AND circuit (2) is connected to the comparator (9). In order to receive the output signals from the and differentiator @ at the same time.

A signal is output to the detonation circuit (11), where it is converted into a detonation signal, and the warhead is detonated via the safety device (11).

〔Effect of the invention〕

As explained above, this invention uses two antennas as the antennas of the proximity fuse, detects the sum and difference signals of these antennas, and detects when the sum signal is greater than a predetermined value and the difference is The signal is phase-detected using a sum signal, then differentiated, and the proximity fuse is configured to be activated only when the output is above a predetermined value.This makes it possible to activate the proximity fuze only near the center of the antenna pattern. This makes it possible to prevent the proximity fuse from malfunctioning due to external interference waves input from sources other than the vicinity of the center of the antenna.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the configuration of a conventional proximity fuse, Fig. 2 is a diagram explaining the pattern of the antenna according to the present invention, and Fig. 3 is a diagram showing the phase detection of the difference signal near the center of the antenna using the sum signal. FIG. 4 is a diagram showing an embodiment of the invention. In the figure, (1) and α→ are antennas, (2) are power dividers, (3) are transmitters, (4) are combiners, (5) are duplexers, (6) and α[ are mixers, ( 7) and ■ are amplifiers, (8) is a detector, (9) is a comparator, H is a detonator circuit,
The purpose is a safety device. ■ is the warhead, α3 is the antenna sum signal pattern, a (a) is the difference signal pattern, αe is the comparator that creates the sum and difference signals, u7) and QS are the power combiners, 12υ is the phase detector, C22 is a differentiator with a threshold, and @ is an AND circuit. The same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] a transmitter that is installed on the guided flying vehicle and generates a signal;
An antenna that emits signals into the air and receives reflected signals from the target aircraft, a device that converts the reflected signals from the target aircraft into Doppler signals, amplifies and detects them, and a device that detects signals that exceed a predetermined size. A proximity fuze consists of a device that generates a signal, and a device that generates a signal that detonates a warhead from this signal.In a proximity fuze, two antennas are used as antennas, and the sum and difference of these two antennas are used. detect the signal, and the level of the sum signal is greater than or equal to a predetermined value, and
Narrowing the angular range in which the antenna receives and operates by performing phase detection of the difference signal with the sum signal and configuring it so that the detonation signal is generated only when the signal generated by taking its differentiation exists. A proximity fuse featuring: