JPS61160074A - Proximity fuse - Google Patents

Abstract

PURPOSE:To prevent erroneous action due to the signal received by a side lobe, by providing a receiving exclusive antenna having the same gain as an antenna used in transmission and reception in common and a receiving apparatus other than said antenna. CONSTITUTION:Other than an antenna 1 used in transmission and reception in common, a receiving exclusive antenna having a gain equal to the side lobe gain of said antenna 1 is provided. An amplifier A16 changes the gain of the antenna 13 corresponding to AGC voltage by the signal received by the antenna 13 and functions so as to keep the magnitude of an output signal constant. The signal received by the antenna 13 is inputted to an amplifier B19 but AGC voltage outputted from an AGC circuit 18 is applied to the amplifier B19 and the gain thereof changes corresponding to the magnitude of AGC voltage. Only when the antenna 1 is larger by predetermined magnitude than the magnitude of the signal received by the antenna 13, a comparator A20 outputs a signal to a detonation circuit 10. By this method, erroneous action due to an external interference wave received from one other than the main lobe of the antenna can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to preventing malfunction of a proximity fuse installed in a guided flying vehicle due to external interference waves.

[Conventional technology]

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 distributes power; (a transmitter that generates 31 consecutive signals); (5) is a duplexer that separates the transmitted and received signals, (6) mixes the received signal and a part of the transmitted power from the combiner (4). A mixer that creates a Dotsupura signal (
An amplifier with 71 predetermined bandwidths.

(A detector that detects an 81-digit Doppler signal, (9) has a predetermined threshold, and a comparator that outputs a signal when the input signal exceeds this threshold, an α1-digit comparator (91f;
a detonation circuit that receives the output signal and generates a detonation signal;
(II) is a safety g# position to maintain the safety of the warhead.

It is a warhead that explodes upon receiving the α2 detonation message. Note that the safety device port 9 and the warhead Q3 are not included in the proximity fuze.-0 When a guided missile is launched in such a configuration, the transmitter +31 Vi coupler (4), duplexer (5),
Radio waves are radiated from the antenna (1) through the power divider (21).When the aircraft enters the beam of the antenna (1),
The signal on the radiation image f1 corresponds to the relative speed between the guided flying object and the target aircraft.After receiving a Doppler shift, the signal returns to the antenna (1).
received at The received HFC signal is sent to the duplexer (
5), mixer (6), taken out by combiner (41) and mixed with a part of the signal of the transmission output →
It becomes a letter and is then input to an amplifier (amplified by 71 and the detector is false), where it becomes a pulse signal and is sent to a comparator (9).
to go into. The input hfc pulse signal is compared with a predetermined threshold b value, and if the pulse signal exceeds this threshold value, a signal is output. This message enters the detonation circuit α1, where it is converted into a detonation signal and sent to the warhead α2 via the safety device #aυ, causing it to explode.

[Problem that the invention seeks to solve]

Conventional devices tend to malfunction when the magnitude of the received signal exceeds a predetermined value, so they tend to malfunction due to large external interference waves received from the side lobes of the antenna, ivy-reflected waves. Ta.

The present invention has been made to overcome these drawbacks, and proposes a proximity fuse which is received from the side a-b and is not activated by a signal received from the side a-b.

[Means for solving problems]

The proximity fuse according to the present invention has, in addition to an antenna that is used for both transmission and reception, a reception-only antenna and a reception device having the same gain as the site lobe gain of this antenna.

[Sakudo]

By changing the gain of the receiving system of the antenna used for both transmission and reception in response to the magnitude of the signal received by the reception-only antenna, which has a gain equivalent to the sidelobe gain of the antenna used for both transmission and reception. This is to realize a proximity fuse that will not operate unless the magnitude of the received signal is larger than that of a reception-only antenna by a predetermined value (a smaller value than the difference in the gain of the two lobes).

〔Example〕

The second bacterium is a diagram illustrating an embodiment of the present invention.

fll to aa are exactly the same as conventional proximity fuses.

(Antenna with a gain equivalent to the sidelobe gain of the 11-piece antenna (1), (I4-piece power divider (power divider with the same characteristics as 21), (combiner (4) like the 151-piece mixer (6)) A mixer that mixes part of the power output from the transmitter (31) with the received signal to create a Doppler signal, an amplifier (A) whose gain changes in response to the haa1g pressure applied from the outside, αη Detector (
Detector with characteristics equivalent to 81, Nishiki is amplifier (A) (
AGC voltage that generates AG○ night pressure so that the w force of le is constant, α9 is an amplifier (A) (amplifier Φ with the same characteristics as J itself).

This comparator (6) has a threshold value that is a predetermined value larger than the output of the wave detector 0η, and outputs a signal when the input signal exceeds this threshold value.

In the proximity fuse configured as described above, the transmitter (3) is equipped with a coupler and a duplexer 151 in the same way as the conventional f:
．． It emits radio waves through the force distributor (21) and through the antenna (1). When the target aircraft enters the beam of the antenna (11), the emitted signal changes to the relative velocity of the guided projectile and the target aircraft. It is received by antenna (1) and antenna 0 with corresponding Doppler shift.T is received by antenna (11).
The L signal passes through the power divider I and is input to the mixer a, where it is taken out by the combiner (4) and sent to the h+transmitter (3).
), it becomes a Doppler signal and is input to the amplifier (A) ae, and after being amplified hk, it is detected by the detector aη and enters the AGC circuit Nishiki.

Here, it corresponds to the magnitude of the detection signal and is 7'? AG (converted to 3 voltages and input to the amplifier) is input to the eel. amplifier body) α
O changes its gain in response to this AGO voltage, and f#J(.

On the other hand, the signal received by the antenna (11) is input to the mixer (6) through the power divider (21, 7" I/I f (51), and the combiner (4) It is mixed with a part of the power of the transmitter (3) and becomes a Doppler signal, which is input to the amplifier (B) α9.Amplifier (E) α
1 is the AGC! output from the AGO circuit aIl. 11t8
E is added, and its gain changes in response to the magnitude of this AGO voltage. In other words, when the signal received by antenna a3 is large, the gain is lowered, and when the signal received is small, the gain is increased.
The signal is amplified by a gain corresponding to the pressure, is detected by a detector (81), and is input to a comparator (A) C!1. Here, it is compared with a predetermined threshold value. The reflected signal from the target aircraft is transmitted to the antenna. (When receiving with 11 main beams, antenna (1
) is larger than antenna 0 by the gain difference between its side lobes, so it always exceeds this threshold.

When receiving, the gains of the antenna (violet) and antenna a1 are the same, so this threshold value cannot be exceeded.

When the input Eft signal exceeds this threshold.

Comparator (A) (to) outputs a signal to detonator circuit aS.

The signal from the detonating circuit is converted into a detonating signal and sent to the warhead 03 via the -1 safety device αI, causing the 9 warhead a3 to explode.

〔Effect of the invention〕

As explained above, in addition to the antenna that is used for both transmission and reception, a reception-only antenna with a gain equivalent to the sidelobe gain of this antenna is provided, and the magnitude of the signal received by this antenna is adjusted accordingly. Correspondingly, the gain of the amplifier in the receiving system is changed by the antenna that is used for both transmission and reception, and the magnitude of the signal received by the reception-only antenna is further increased.

By activating the antenna only when the antenna is large by a predetermined magnitude, it is possible to prevent malfunctions caused by external interference waves received from sources other than the main lobe of the antenna and signals reflected by clutter.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a conventional proximity fuse supply, and FIG. 2 is a diagram showing an embodiment of the invention. In the figure, (1) and (I3 are antennas, (21 and +1
41 is a power divider, (3) is a transmitter, (4) is a combiner,
(5) is a duplexer, (6) and (I!9 mixer,
+71Fi amplifier, (81 and αη detector, (9) and (to) are comparators, al is the detonation circuit, all is the safety device, (I2 is the warhead, eel and al are amplifiers whose gain changes depending on the external input voltage, This is a nishikike AGO circuit. In addition, the same reference numerals in each figure indicate the same or corresponding parts that are underwater. Fig. 1 Fig. 2

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 to detonate a warhead from this signal.In addition to the antenna that emits the signal and receives the reflected signal from the target aircraft, By providing a receiving antenna with a gain equivalent to the sidelobe gain of the antenna, and changing the gain of the receiving system of other antennas in response to the magnitude of the signal received by this receiving antenna, the antenna's sidelobe gain can be improved. A proximity fuse characterized by being configured to prevent malfunction due to signals received from outside the main lobe.