JPH0254912B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention irradiates a target with a transmitted wave, detects a reflected wave from the target, and generates a detonation pulse when the target passes near a guided flying object. The invention relates to active proximity fuses for guided missiles.

[Prior art]

A conventional active proximity fuse of this type will be briefly explained. In FIG. 1, N is an active proximity fuze, 1 is a carrier signal generator that generates a carrier signal of the transmission wave 9 to be irradiated to the target 10, and 2 is a carrier signal generator that modulates the carrier signal output from the carrier signal generator 1 to generate a transmission signal. 3 is a power amplifier that amplifies the transmit signal output from the transmit signal generator 2 and outputs a high power transmit signal; 4 is a high power transmitter for the output of the power amplifier 3; A divider 5 that divides the signal into two systems supplies the high power transmission signal distributed by the divider 4 to the upper side antenna 7, and includes a demodulator A14 and a demodulator B17.
The signal received by the upper side antenna 7 is not supplied to the demodulator A14, the demodulator B17,
A circulator that does not supply power to the power divider 4, 6
supplies the high power transmission signal distributed by the distributor 4 to the lower side antenna 8, does not supply it to the demodulator A14 and the demodulator B17, and also supplies the high power transmission signal distributed by the distributor 4 to the lower side antenna 8.
The signal received by the circulator 7 is supplied to the demodulator A14 and the demodulator B17, but not to the power divider.The circulator 7 irradiates the high power transmission signal supplied from the circulator 5 in an upward direction so that the target 10 passes near the upper side. When the target 10 passes near the lower side, the upper side antenna 8 receives the reflected wave 11 from the target 10 and radiates the high power transmission signal supplied from the circulator 6 downward. A lower side antenna receives the plate 11, 9 is a transmission wave irradiated to the target 10 from the upper side antenna 7 and the lower side antenna 8, 10 is an active proximity fuze N
is the target detected by , 11 is the reflected wave from target 10,
Reference numeral 12 denotes an inter-clutter distance detection gate signal setting unit that generates a ground gate signal for determining the ground-to-ground detection distance based on the demodulation reference signal output from the transmission signal generation unit 2; The signal is delayed by the delay time shown in the following formula, which corresponds to the ground distance in the direction of the detection beam (for example, the delay time is automatically set in proportion to the frequency of the demodulated reference signal) τC=Rc×2/ 150 τC...Clatsuta delay time Rc...Ground distance in the detection beam direction Generates a ground gate signal. Reference numeral 13 denotes a target detection effective range gate signal setting unit that generates a target gate signal for determining a target detection distance based on the ground gate signal output from the inter-clutter distance detection gate signal setting unit 12; τT = τC - τCO τT...Target Delay time τCO... Clutter/target discrimination delay time target gate signal is generated. 14 is a signal received by the upper side antenna 7 and lower side antenna 8 and supplied via the circulator 5 and circulator 6, and the ground gate signal output from the interclutter distance detection gate signal setting section 12. When the distance becomes shorter than the distance to the ground set by the ground gate signal, the signal input from the circulator is demodulated by the ground gate signal, and a demodulator generates a signal with a level proportional to the shortened distance, that is, a clutter demodulation signal. A, 15 is demodulation section A14
It is detected in advance that the distance between the ground approaches the arbitrarily set effective warhead distance and intrusion from the Kuratsuta demodulated signal output from the Kuratsuta demodulated signal. A warhead effective range clutter intrusion detection circuit 16 generates a control signal for controlling the demodulation frequency of the demodulation reference signal of the signal modulation signal generating section 16, and the warhead effective range clutter intrusion detection circuit 16 performs demodulation, for example, using a control signal output from the warhead effective range clutter intrusion detection circuit 15. 17 is an upper side antenna 7; a transmission signal modulation signal generation section that variably controls the modulation frequency of the reference signal and thereby generates a modulation reference signal that controls the transmission signal generated by the transmission signal generation section 2 and the demodulated reference signal; , a demodulation section B, 18 which generates a target demodulated signal from the signal received by the lower side antenna 8 and supplied via the circulator 5 and circulator 6, and the target gate signal output from the target detection effective range gate signal setting section 13. determines whether the distance to the target 10 is outside or inside the target detection distance set at that time from the target demodulated signal output from the demodulator B17, and if it is outside the target detection distance, outputs a low level signal. A target intrusion detection circuit within the target detection effective range outputs a high level signal when the target intrusion is within the target detection range, and 19 generates a detonation signal when the output of the target intrusion detection circuit 18 within the target detection effective range is a high level signal. , is a detonation signal detection circuit that does not generate a detonation signal in the case of a low level signal.

The conventional active proximity fuse N is configured as described above, and when the target 10 enters within the target detection range of the active proximity fuse N, a detonation signal is generated. In addition, if a Kuratsuta enters within the warhead effective range of the active proximity fuze N at extremely low altitude, a detonation signal will be generated at the Kuratsuta, so the target gate signal is controlled depending on the distance between the Kuratsuta and the target detection effective range is adjusted to reduce the warhead's effective range. By varying the range within the effective distance range, it prevents the detonation signal from being generated by Kuratsuta.

However, if the distance between the clutters enters the warhead effective range of the active proximity fuze N, the effective target detection range becomes short, and therefore the target detection effective range suddenly becomes narrower.
(Decrease in the ability of guided air vehicles to shoot down targets 10. Especially in recent years, there has been a strong desire to improve the ability of guided air vehicles to shoot down low-altitude targets, and the above drawbacks have become an important issue.) [Summary of the invention] ] This invention was made with the aim of improving this drawback.The target detection distance of the lower side antenna, which is affected by clutter, is processed as before, and the target detection distance of the upper side antenna, which is not affected by clutter, is We propose an active proximity fuze that prevents the effective target detection range for low-altitude targets from rapidly narrowing by controlling the warhead to always maintain a constant distance (effective warhead distance) and improves the ability of guided flying vehicles to shoot down 10 targets. It is something to do.

[Summary of the invention]

FIG. 2 is a diagram showing an embodiment of this invention,
1 to 4 and 6 to 19 are the same as in FIG. Furthermore, the signal received by the upper side antenna 7 is sent to the demodulator A14 and the demodulator B1.
In FIG. 2, the high power transmission signal distributed by the distributor 4 is sent to the upper side antenna 7.
The signal received by the upper side antenna 7 is supplied to the demodulator C21 and is not supplied to the demodulator C21, which is a newly added device in FIG. 20 to 23 are circulators that are not supplied, and are newly added devices to FIG. 20 is a warhead effective range gate signal setting unit that generates a warhead gate signal to keep the warhead effective range constant at all times using the demodulated reference signal output from the transmission signal generator 2; 21 is a signal received by the upper side antenna 7; The demodulation unit C, 22 generates a warhead demodulation signal from the warhead gate signal output from the warhead effective range gate signal setting unit 20 and the signal supplied via the warhead effective range gate signal setting unit 20. The warhead determines whether it is outside or inside the warhead's effective range, which is always set at a constant value, and outputs a low-level signal if it is outside, and a high-level signal when it enters within the warhead's effective range. The target intrusion detection circuit within effective range 23 outputs a low level signal when the outputs of the warhead effective range target intrusion detection circuit 22 and the target detection within effective range target intrusion detection circuit 18 are both low level signals. Outputs a high level signal in other cases
It is an OR circuit.

Active proximity fuze configured as above
At N', even if the distance between the clusters enters the warhead effective range of the active proximity fuze N', the target detection distance of the lower side antenna 8 will be shortened to prevent the detonation signal from being generated at the cluster. ,
The target detection range of the upper side antenna 7, which is not affected by clutter, always maintains the warhead effective range. Therefore, a sudden decrease in the target detection effective range is prevented.

〔Effect of the invention〕

This invention has the configuration as explained above,
This has the effect of reducing the reduction in the effective target detection range for low-altitude targets and improving the ability of guided flying vehicles to shoot down low-altitude targets.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a conventional active proximity fuse, and FIG. 2 is a block diagram showing an embodiment of the present invention. In the figure, 1 is a carrier signal generator, 2 is a transmission signal generator, 3 is a power amplifier, 4 is a power divider,
5 is circulator A, 6 is circulator B,
7 is the upper side antenna, 8 is the lower side antenna,
9 is a transmitted wave, 10 is a target, 11 is a reflected wave, 12 is an inter-clutter distance detection gate signal setting section, 13 is a target detection effective range gate signal setting section, 14 is a demodulation section A, 15 is a clutter intrusion within the warhead effective range Detection circuit, 16 is a transmission signal modulation control signal generation section, 17 is a demodulation section B, 18 is a target detection effective range target intrusion detection circuit, 19 is a detonation signal generation circuit, 20 is a warhead effective range gate signal setting section, 21 is a Demodulator C, 22
is the warhead effective range target intrusion detection circuit, 23 is OR
The circuit, N, is an active proximity fuse. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A carrier signal generation section that generates a carrier signal of a transmission wave to be irradiated to a target, a transmission signal generation section that modulates the carrier signal and generates a transmission signal and at the same time generates a demodulation reference signal, and amplifies the transmission signal and performs high-power transmission. A power amplifier that outputs a signal, a power divider that distributes a high power transmission signal to an upper side antenna and a lower side antenna, and a demodulation section A and a demodulation section B that supply the distributed high power transmission signal to the upper side antenna. Also, the signal received by the upper side antenna is supplied to demodulator A and demodulator B, but not to the power divider, and the distributed high power transmission signal is sent to the lower side antenna. supply,
The signal received by the lower side antenna is not supplied to demodulator A and demodulator B, and is not supplied to demodulator A and demodulator B.
a circulator B that supplies power to the power source and does not supply power to the power divider; an upper side antenna that irradiates the supplied high power transmission signal in an upward direction and receives reflected waves from the target when the target passes near the upper side; A lower side antenna receives the reflected wave from the target when the target passes near the lower side, and a ground gate signal that determines the ground detection distance using the demodulated reference signal. A clutter distance detection gate signal setting section that generates a clutter distance detection gate signal, a target detection effective range gate signal setting section that generates a target gate signal that determines the target detection distance from the ground gate signal, and a clutter demodulation signal from the reflected wave and the ground gate signal. The demodulator A detects in advance that the distance to the ground approaches the effective range of the warhead and intrudes from the Kuratsuta demodulated signal, and generates a control signal to control the transmission signal modulation signal depending on the degree of approach and the degree of intrusion. A warhead effective range clutter intrusion detection circuit, a transmission signal modulation signal generation section that generates a modulation reference signal that controls the transmission signal generation section using a control signal output from the warhead effective range clutter intrusion detection circuit, and a reflected wave and a target gate. Demodulator B generates a target demodulated signal from the signal
Then, based on the target demodulated signal, it is determined whether the distance to the target is outside or inside the target detection distance set at that time, and if it is outside, a low level signal is sent. When the output of the target intrusion detection circuit within target detection effective range outputs a high level signal and the output of the target intrusion detection circuit within target detection effective range is a high level signal, a detonation signal is generated, and when it is a low level signal, a detonation signal is generated. In a proximity fuze equipped with a detonation signal generation circuit that does not generate a detonation signal, a warhead effective range gate signal setting section that generates a warhead gate signal that constantly maintains a warhead effective range constant by a demodulated reference signal, and a reflected wave received by an upper side antenna. A demodulator C generates a warhead demodulation signal from a warhead gate signal, and a demodulator C determines from the warhead demodulation signal whether the distance to the target is outside or inside the warhead effective distance, which is always set to a constant value. A warhead within effective range target intrusion detection circuit outputs a low level signal when the warhead intrudes within the effective range, and a warhead target intrusion detection circuit outputs a high level signal when the warhead intrudes within the effective range. An active device characterized by having an OR circuit that supplies a high level signal to the detonation signal generation circuit when the output of the detection circuit is a high level signal, and otherwise supplies a low level signal to the detonation signal generation circuit. Proximity fuse.