JPS623741Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an operation control device for a proximity fuse mounted on a guided flying vehicle.

Conventional control devices of this type detect that the target detection level of the guided flying object is above a predetermined value, and that the frequency of the Doppler frequency component included in the target detection signal is close to zero depending on the relative speed between the target and the flying object. The fuse was controlled to be activated when the target and the guided projectile reached their closest point.

However, if an unnecessary noise signal is mixed into the detected output of the Doppler frequency component, there is a risk that this signal will be detected and erroneously determined to be at a point near zero Doppler frequency.

This idea was made in view of the above circumstances.
Focusing on the phenomenon that the Doppler frequency gradually decreases as the guided flying object approaches the target, the Doppler frequency extraction output can be adjusted by detecting the gradual decrease in the Doppler frequency and generating a fuse activation control signal. An object of the present invention is to provide a proximity fuse activation control device that can prevent a fuze from being erroneously activated due to a noise signal contained therein.

An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, 11 is an antenna mounted on a guided flying object, and the output of a radar transmitter 12 is transmitted through a circulator 13 from the antenna 11 toward a target (not shown). The signal that is reflected by this transmitted signal when it hits the target is subjected to a Doppler frequency shift by a frequency that corresponds to the relative velocity between the guided flying object and the target. This reflected signal is received by the antenna 11 and guided through the circulator 13 to the mixing circuit 14 where the transmitter 1
It is mixed with a part of the output signal of 2. The frequency difference component of both signals obtained by this mixing, ie, the Doppler frequency component, is guided to the bandpass amplifier 15, where it is extracted and amplified.

On the other hand, as shown in FIG. 2, F _o to F ₁ are filters each having a predetermined pass band whose center frequency decreases in sequence, for example, having a band corresponding to the required Doppler frequency change range as a whole, Of these, the filter _F1 is designed to be able to extract signals with frequencies near zero. And each of the above filters F _o ~
The output of the bandpass amplifier 15, that is, the Doppler frequency signal is guided to _F1 . Each of these filters F _o ~
The extracted outputs of _F1 are guided to detectors D _o to _D1 , where they are detected and converted into direct current. Each of these DC outputs is led to a comparator C _o to _{C 1} and compared with a preset reference level, and for example, when the input level is higher than the reference level, an output pulse is generated as a detector output is present. . These output pulses are generated sequentially as the Doppler frequency decreases, and are respectively guided as trigger inputs of the monomulti circuits M _o to M ₁ . The time constants of the monomulti circuits M _o to _{M 1} are set so that the time width of each output pulse continues until a Doppler frequency near zero is obtained. That is, as shown in FIG. 3, the Doppler frequency changes from time t ₀ to _{t o} to
If ₀ is obtained, the monomulti-circuit M _o ~
As shown in FIG. 3, the time width of each output pulse of _M1 is set to be larger than t _o -t ₀ to _{t o} -t _o-1 . If each output pulse of the monomulti circuit M _o ~ M ₁ is led to the AND circuit A, the Doppler frequency
When _o to ₀ is obtained, an AND output as shown in FIG. 3 is obtained from the AND circuit A by the AND logic of each of the output pulses. That is, by guiding each output pulse of the monomulticircuits _M1 to _M0 to the AND circuit A, when Doppler frequencies _o to ₀ are obtained, an AND output as shown in FIG. 3 is obtained.

The output of each AND circuit A is used as a fuse activation control signal.

According to the proximity fuse actuation control device as described above, the Doppler frequency ranges from a certain frequency to near zero within the required frequency band formed by the films F _o to F ₁ .
When the Doppler frequency decreases continuously to ₀ , the AND circuit A performs AND processing on each successive output pulse that is sequentially output from the monomulticircuits M _o to M ₁ until the Doppler frequency becomes near zero.

Therefore, the point in time when the Doppler frequency continuously decreases to near zero, that is, the point in time when the guided flying object and the target are closest to each other, can be reliably detected. Even if a noise signal is mixed into the output of the band amplifier 15, that is, the input of the filters F _o to F ₁ , the probability that this noise target will have a frequency change similar to the Doppler frequency is very low. There is almost no possibility of detecting the point of closest approach.

In the above embodiment, the number of filters F ₁ to _{F o} is n
However, the number of filters may be appropriately selected within a range that allows identification of regular Doppler frequency change signals.

For example, within a certain frequency range, the passing frequencies of a plurality of filters do not necessarily need to be continuous, but may be distributed at certain frequency intervals. That is, it detects a decreasing tendency of the Doppler frequency and operates based on this.

As described above, the present invention detects the phenomenon in which the Doppler frequency gradually decreases and generates a fuze activation control signal, thereby preventing the fuze from being erroneously activated due to the noise signal contained in the Doppler frequency extraction output. It is possible to provide a proximity fuze activation control device that can perform

[Brief explanation of the drawing]

Fig. 1 is a configuration explanatory diagram showing one embodiment of the proximity fuse operation control device according to the present invention, Fig. 2 is a characteristic diagram of the filter group shown in Fig. 1, and Fig. 3 is for explaining the operation of Fig. 1. FIG. F _o ~ F ₁ ... Filter, D _o ~ _{D 1} ... Detector, C
_o ~ _C1 ... Comparator, M _o ~ _M1 ... Mono multi circuit, A... AND circuit.

Claims (1)

[Scope of utility model registration request] A device mounted on a guided flying object that receives a reflected signal from a target to which the flying object should approach and extracts a Doppler frequency component included in the received signal, and a device that guides the Doppler frequency signal extracted by this device. A plurality of filters having different center frequencies, a plurality of detectors that detect Doppler frequency signal extraction outputs of each filter, and a plurality of detectors that are connected to each of the detectors and operate with each detection output to derive an output signal for a predetermined time. A proximity fuse operation control device comprising: a mono multi-circuit; and an AND circuit to which outputs of the mono multi-circuits are respectively supplied, and actuating a fuse by the output of the AND circuit.