KR19990026371A - Pulse Proximity Detection Circuit - Google Patents

Abstract

The present invention provides a circuit arrangement of a distance sensor.

The circuit arrangement of the distance detector of the present invention is composed of an RF oscillator, an antenna, a transmission switch, a reception switch, a pulse generator, an inverter, an amplifier, a low pass filter, a comparator, an AND circuit, an integrator, and a delay circuit. It is possible to provide a target detection circuit device having a transmission and reception function of a pulse oscillation method resistant to noise, which can detect a target at a constant position irrespective of conditions, thereby reducing variation in the dispersion of the detection distance.

Description

Pulse Proximity Sensing Circuitry

The present invention relates to a detector, that is, a distance detector mounted on a vehicle, and more particularly, to a circuit device having a transmitting function and a receiving function to detonate a vehicle at an appropriate distance after the aircraft approaches a target and detects the target. will be.

The distance sensor has the function of causing the initial process of the explosive chain to ignite and explode the explosives of the explosive device, and when the explosive is detonated, it explodes on the next explosive and finally ignites until the Peony's Peony.

All distance sensors shall have four functions: safety, loading, sensitivity and explosion. In terms of safety, the distance detector shall be designed so that it does not operate before the required time. It must also be safe during storage, loading, shipping, handling and launching.

The distance sensor is a second function and must be loaded at the appropriate time after firing. This may be achieved by appropriate use of natural phenomena that occur while the launch vehicle is leaping.

The distance detector must also have the ability to detect the position of the target. In order to achieve this final purpose, it is possible to make contact with the target, to approach the target, to measure a scheduled jump time from launch or to measure the characteristics of the trajectory indicating the presence of the target.

As the last function of the distance sensor, the distance sensor should be exploded at a predetermined time for optimum effect.

On the other hand, if the distance detector of the aircraft is classified according to its operation form or function, it can be classified into an impact distance detector, a time distance detector, an ambient distance detector, a proximity distance detector and a command distance detector.

The proximity sensor is equipped with an electronic device having a transmission function and a reception function. The distance sensor has a function of receiving the signal reflected from the target and operating the detonator at an optimum approach distance. Say.

This distance detector is intended to act upon receipt of the reflected radio wave at the optimum approach distance of the radio wave reflected from the target. Proximity detectors use the principles of transmission and reception: continuous wave Doppler effects, frequency modulation, pulse radar, and pulse Doppler.

Conventionally, the continuous wave (CW) method has been used as a format of the transmission wave used in the above-described transmitting and receiving apparatus.

1 shows a target detection circuit arrangement of the prior art, in which the RF oscillator 10 and the antenna 11 function as a CW oscillation element, and the antenna 11 transmits and receives the oscillated signal. It acts as a so-called active antena. Transmitted and received signals are self-mixed by a non-linear element of a transistor (not shown) to provide Doppler information to a later Doppler signal detector.

In the circuit device including the RF oscillator 10 of FIG. 1, the RF oscillator 10 is composed of a transistor Q1 as an LC oscillation circuit and L and C as reactance elements, and some elements use real elements. The device is built into the distance detector in the form of a pattern that functions as an LC. The received RF signal is detected by the Doppler signal by detecting the Doppler signal, and the amplitude of the detected signal is affected by various noise components or component errors.

Therefore, in the continuous wave type target detection circuit device, the distance sensing function changes irregularly according to the above factors. That is, the dispersion of the sensing distance to the target is large, and the continuous wave is easily susceptible to external influences such as weather or other radio waves, and thus is weak in noise, causing a large explosion of the distance detector.

The present invention is conceived under the above-mentioned background, a target detection circuit having a transmission and reception function for use in a proximity-type detector aircraft, detection distance to detect a target at a constant position irrespective of external conditions such as weather or external radio waves. It is an object of the present invention to provide a target detection circuit device having a transmission / reception function of a pulse oscillation method that is resistant to noise, in which variation of a signal is reduced.

1 is a schematic block diagram of a target detection circuit apparatus having a transmission and reception function of the prior art;

2 is a schematic block diagram of a target detection circuit apparatus having a transmission and reception function according to the present invention;

3 is a waveform diagram of a signal transmitted from the target detection circuit device of FIG.

4a, b, c and d show the pulse generator output signal of the target detection circuit device of FIG. 2, the output signal of the delay circuit, the output signal of the comparator and the output signal of the AND circuit, respectively,

5 is a waveform diagram of an output signal of the integrator of the target detection circuit apparatus of FIG. 2.

* Explanation of symbols for main parts of the drawings

10: RF oscillator 20: Antenna

30: transmit switch 40: receive switch

50: pulse generator 60: inverter

70: amplifier 80: low pass filter

90: comparator 100: AND circuit

110: integrator 120: delay circuit

In order to achieve the above object, the present invention has a transmitting function and a receiving function for detecting the proximity of a target in an air vehicle distance detector, and receiving a signal reflected by the target to detect the distance to the target. A target detector circuit apparatus of a distance detector, comprising: an RF oscillator for generating an RF oscillation signal, a pulse generator for adding a pulse signal to the oscillated signal, a transmission switch for switching to transmit a pulse signal of the pulse generator, the RF oscillator, An antenna for transmitting a signal passing through a pulse generator and a transmission switch, receiving an signal reflected from a target, a receiving switch for switching the signal from the antenna, and an inverter for converting a waveform of the pulse signal generated by the pulse generator by 180 ° An amplifier for amplifying the weak signal from the receiving switch, and an amplified signal from the amplifier. A low pass filter for removing harmonic components, a comparator for shaping the waveform by setting the amplitude of the signal from the low pass filter to a constant size, and a time for which any pulse signal output from the pulse generator is received through the antenna. And a delay circuit for delaying, an AND circuit for logic output of the comparator and an output of the delay circuit, and an integrator for integrating the output of the AND circuit.

In the circuit arrangement, the pulse generator is characterized in that the pulse signal controls the transmission switch and the reception switch.

In addition, the receiving switch is turned off when the RF signal transmission, the transmission switch is characterized in that off when receiving the RF signal.

The delay circuit has a time delay of 67 nsec when the moving distance of the radio wave is 20 m.

Hereinafter, the present invention will be described in detail with reference to an embodiment of the present invention.

Throughout the drawings, the same and similar drawing protection is given to the same and similar parts.

Figure 2 shows a block diagram of the configuration of the target detection circuit apparatus of the proximity sensor of the present invention, as shown, the RF oscillator 10, the antenna 20, the switch (30, 40) for oscillating RF preference , A pulse generator 50, an inverter 60, an amplifier 70, a low pass filter 80, a comparator 90, an AND circuit 100, an integrator 110, a delay circuit 120, and the like.

It will be described below the operation of the target detection circuit device of the present invention configured as described above.

The signal generated from the RF oscillator 10 is combined with the signal of the pulse generator 50 which adds a pulse signal to the oscillated signal and sent to the switch 30, which switches the pulse generator 50. The pulse signal is controlled to be ON so that the signal is transmitted through the antenna 20. In this case, the switch 40 is controlled to be off by the pulse generator 50.

The transmitted signal is hit by the target, reflected and received again via the antenna 20. As described, the antenna 20 participates in both transmission and reception. The signal received through the antenna 20 is input to the switch 40 by the switch 40 is turned on by the pulse control signal of the pulse generator 50. At this time, the switch 30 is controlled to be off by the signal of the pulse generator.

The pulse signal is input to the switch 40 via an inverter 50 for converting the waveform of the pulse signal generated by the pulse generator 50 by 180 degrees. Since the received signal at the output of the switch 40 is a weak signal as the signal is attenuated during the reception process, the signal is amplified through the amplifier 70 and the signal is input to the low pass filter 80 to remove harmonic components therefrom. The signal of the low pass filter 80 is input to a comparator 90 for shaping the waveform by setting the amplitude of the signal to a predetermined magnitude to recover the original signal waveform.

The signal of the output of the comparator 90 and the output of the delay circuit 120 for time-delaying any pulse signal output from the pulse generator by the time received through the antenna 20 are connected to the AND circuit 100. It is logical through. The output of the AND circuit 100 is integrated in the integrator 110 to obtain the value of the received signal.

The signal oscillated and transmitted by the pulse signal of the RF oscillator 10 and the pulse generator 50 is as shown in Figure 4a, the delay signal of the delay circuit 11 is shown as shown in Figure 4b, the comparator 90 The received signal output from the is shown in Figure 4c, the signal passing through the AND circuit 100 is shown in Figure 4d.

The output of this AND circuit is the product of Fig. 4B and 4C. That is, as the delay signal of FIG. 4B overlaps with the reception signal of FIG. 4C, a larger integral value can be obtained. In other words, the more the delay signal and the received signal overlap, the smaller the error of the sensing distance.

As shown, in this embodiment, the pulse width, that is, the propagation movement distance is 20m, but since the signal is transmitted and received, the distance between the antenna and the target when the distance from one clock pulse to the next clock pulse is set to 100m as in this embodiment. At 10m, 110m, 210m, the waveforms of Figs. 4b and 4c are completely coincident. In practice, the overlapping of the delayed signal and the received signal completely over 110m can be ignored because the received signal is weak. Here, the delay circuit 120 has a time delay of 67 nsec when the moving distance is 20 m.

Therefore, when the signal of FIG. 4D passes through the integrator, the signal of FIG. 5 may be obtained. That is, the maximum value can be obtained at 10m.

The waveforms of FIGS. 4B and 4C do not overlap at distances of 0m, 20-100m, 120-200m, and so on, and the output of the AND circuit 100 becomes zero. In other areas, an integral value is obtained in proportion to the overlapping amount of the received signal and the delay signal.

As described above, the present invention obtains the sensing distance using the received signal of the transmission signal and the delay signal generated by the pulse generator 40, so that components such as noise that affect the amplitude of the signal do not affect the time delay. A received signal can be obtained. In addition, since the transmit pulse width is set to 10m, it has the maximum integral value at the 10m point of the target, and the distance sensor may explode near the target 10m even when considering external factors.

Therefore, according to the above configuration, the present invention can detect a target at a constant position regardless of external conditions such as weather or external radio waves, and thus has a target having a transmission / reception function of a pulse oscillation method that is strong against noise, which reduces variation in detection distance. Has the effect of providing a detection circuit arrangement.

So far, the present invention has been described with reference to one embodiment, but the present invention is not limited thereto, and various modifications and changes may be made by those skilled in the art without departing from the spirit and scope of the appended claims.

Claims (4)

A target detection circuit device of a distance detector having a transmitting function and a receiving function for detecting proximity of a target in a vehicle distance detector, and detecting a distance from the target by receiving a signal reflected by the transmitted signal, the RF signal comprising: RF oscillator 10 for generating an oscillation signal, pulse generator 50 for adding a pulse signal to the oscillated signal, transmission switch 30 for switching to transmit the pulse signal of the pulse generator, the RF oscillator, pulse generator And an antenna 20 for transmitting a signal passing through a transmission switch and receiving a signal reflected from a target, a reception switch 40 for switching a signal from the antenna, and a pulse signal generated from the pulse generator 50. Inverter 60 converts the waveform 180 °, amplifier 70 amplifies weak signal from the receiving switch, and removes harmonic components from the amplified signal from the amplifier. The low pass filter 80, the comparator 90 for shaping the waveform by setting the amplitude of the signal from the low pass filter 80 to a constant size, and the arbitrary pulse signal output from the pulse generator 80 A delay circuit 120 for delaying time by a time received through an antenna, an AND circuit 10 for logic output of the comparator and an output of the delay circuit, and an integrator 110 for integrating the output of the AND circuit. Target detection circuitry of the distance sensor, characterized in that. 2. The circuit arrangement according to claim 1, wherein the pulse generator (50) controls the pulse signal to control the transmission switch (30) and the reception switch (40). 2. The circuit arrangement according to claim 1, wherein the reception switch (40) is turned off when the RF signal is transmitted and the transmission switch (30) is turned off when the RF signal is received. 2. The circuit device according to claim 1, wherein the delay circuit (120) has a time delay of 67 nsec when the moving distance of the radio wave is 20 m.