CN2234638Y

CN2234638Y - Airborne meteorological radar radiation alarm

Info

Publication number: CN2234638Y
Application number: CN 95239613
Authority: CN
Inventors: 周德生
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-04-21
Filing date: 1995-04-21
Publication date: 1996-09-04
Anticipated expiration: 2005-04-21

Abstract

The utility model discloses an airborne meteorological radar radiation alarm, which is composed of a high frequency part, a magnifying part, an identifying part, a displaying part, and a self-checking circuit. The utility model is characterized in that the identifying part is composed of a pulse acceptance filter, a binary synchronous counter and a timing pulse generator, and an alarm signal is displayed by an identifying alarm circuit and an immediate alarm circuit to remind users to rapidly leave a radiation zone and prompt pilots to close meteorological radars. Additionally, the self-checking circuit can simulate to produce the meteorological radar signals to check whether the alarm is well or not. The alarm has the advantages of small volume, light weight, and power consumption saving, and is a portable self security protecting appliance for ground workers of airports.

Description

The airborne weather radar radiation alarm

The utility model relates to a kind of portable self-protection electronic equipment, particularly a kind ofly is exclusively used in the airborne weather radar radiation alarm that Civil Aviation Airport engineering maintenance personnel carry.

General aircraft, as various passenger planes, large-scale bomber, transporter etc., all equipping a kind of weather radar foremost at fuselage, it provides the place ahead and meteorological data and topographic(al) data for the safe flight of aircraft, this radar forwards gives off superpower microwave beam, after running into barriers such as cloud layer, mountain peak when work, the reflection wave that produces is received by radar receiver again, shows the meteorology and the topographic(al) data in the place ahead after treatment on video screen.The frequency of operation of weather radar is 9345 ± 30MHz, maximum output 10KW, modulating pulse repetition frequency 120Hz, pulse width 3.5 μ S.It belongs to a kind of superpower microwave pulse signal, and the people is known from experience the generation radiation, and injury is very big, and the people does not have any sensation by radiation the time.So, in accordance with regulations, before aircraft enters the hardstand; weather radar must cut out; but because some accidentalia, pilot or weather radar maintenance personal forget and close weather radar sometimes, or the maintainer of weather radar is when start; not to be noted also have other people in the radiation area in work; at this moment, the surface work personnel on airport will be subjected to the injury of microwave radiation, especially flight crew; they will be engaged in service work near the antenna house of weather radar, and the harm that is subjected to is just bigger.At present, the domestic airport only guarantees that by some rules and regulations it can't guarantee the generation of accidental accident to this high power microwave to the strick precaution of human body radiation, so this microwave radiation still exists airport engineering maintenance personnel's potential hazard.

The purpose of this utility model provides a kind of confession airport ground staff and carries, and can in time hide when being subjected to radar wave radiation, and point out the pilot to close weather radar rapidly, reduces the airborne weather radar radiation alarm of radiation hazard.

The purpose of this utility model realizes by following technical measures, the airborne weather radar radiation alarm, it is by high frequency, amplify, identification, alarm indication and self check five major parts and power supply are formed, HFS is mainly used in the receiver carrier gas and resembles the radar transmitted pulse modulated microwave signal, and convert thereof into the rectangular pulse signal that repetition frequency is 120Hz, it is made up of a microstrip antenna and a wave detector that is connected as a single entity with casing, amplifier section comprises the one-level prime amplifier of series connection successively, the secondary main amplifier, one-level voltage comparator and one-level pulse width widening circuit, it amplifies the very little pulse signal of the amplitude of wave detector output and broadening, be passed to identification circuit, alarm indication comprises that partly identification alarm indication and instant alarming show that the identification division that is characterised in that of the present utility model is by one-level pulse gate wave-wave device, one-level scale-of-two synchronous counter and one-level time limit pulse producer constitute; Pulse gate wave-wave device is 110Hz～130Hz bandpass filter, the output terminal Q of pulse width widening circuit joins in its input end and the amplifier section, the output terminal of pulse gate wave filter joins along trigger end-TP with the input end of clock CP and the back of time limit pulse producer of scale-of-two synchronous counter respectively, the SCR control end of identification alarm indication in the output terminal OC display part taking alarm of scale-of-two synchronous counter, light emitting diode and hummer that control is joined with it send alerting signal, also have a reset switch to be connected on the controllable silicon negative electrode in addition.After in a single day the identification alerting signal is sent, can not die away, it can press the Reset button in back, district out of danger or after pointing out aircraft person to close weather radar according to user's needs, could disappear.The clear terminal of the output termination scale-of-two synchronous counter of time limit pulse producer, simultaneously also with alarm indication part in the switch triode base stage that shows of instant alarming join, the lumination of light emitting diode of starting instant alarming is reported to the police, and the instant alarming signal can be died away after the user breaks away from radiation area.The utility model has also designed self-checking circuit, because alarm belongs to the contingency working equipment, whether the user can not well remove to open airborne weather radar for the alarm that inspection is controlled oneself, so it can produce the weather radar modulated pulse signal of simulation the self-checking circuit of the utility model design, whether good in order to check whole alarm all circuit except that antenna, the self check of alarm partly is by oscillator, frequency divider, differentiating circuit, rectification circuit, pulse shaping circuit and attenuator are formed, oscillator wherein, it is that 14 grades of serial binary counter/frequency dividers and oscillator constitute that frequency divider adopts CC4060, the electrical connection of self-checking circuit is: the removing termination self check electric switch of oscillator and frequency divider, the input end of the output termination differentiating circuit of frequency divider, the input end of the output termination rectification circuit of differentiating circuit, the input end of the output termination shaping circuit of rectification circuit, the input end of the output termination attenuator of shaping circuit, the output terminal of attenuator connects the wave detector of HFS and the prime amplifier of amplifier section respectively.Airborne weather radar radiation alarm described in the utility model has three kinds of duties: wait state, warning duty and self check duty.Wait state is the power supply on of alarm, but the duty when not receiving the microwave radiation of weather radar, this moment, the display circuit of alarm was not worked, and the complete machine each several part all is in static state, and current sinking is very little, about 6mA; The warning duty is the duty of alarm when receiving the microwave radiation of weather radar, and high frequency, amplification, identification circuit are started working, and display circuit sends alerting signal, the about 14m A of complete machine current sinking; The self check duty is the duty of alarm performance when self-verifying.

The utility model is such except that the complete machine principle of work of self check part: the surface work personnel are at the alarm switch of carrying near the aircraft front opening, make alarm be in wait state, if the weather radar of aircraft is opened, enter the microwave radiation district of weather radar the surface work personnel after, the antenna of alarm will receive this microwave signal, through the wave detector detection, output pulse width is 3.5 μ s, repetition frequency is that the pulse signal of 120Hz is given amplifier section, prime amplifier in the amplifier section, the secondary main amplifier pulse signal that this is faint amplifies about 80db, be added to voltage comparator, if pulse height is greater than 2V, voltage comparator has output, otherwise, no-output then, the reference voltage of regulation voltage comparer, the operating distance that can regulate alarm, and can be with faint noise jamming filtering, the pulse width widening circuit can be 50 unified μ s pulse signals with the whole broadenings of train of impulses of prime output, is beneficial to the working stability of identification division.

The pulse gate wave filter is a bandpass filter, it only allows the frequency be that 110Hz to 130Hz train of impulses passes through, the disturbing pulse of all the other frequencies can't pass through, the train of impulses of pulse gate wave filter output is added to " clock " input end CP of counter, count by counter paired pulses string, simultaneously, pulse selecting filter output terminal is also received the back along trigger end-TR of time limit pulse producer (being a 160ms monostable trigger), when first pulse arrives, the time limit pulse producer produces the pulse that pulsewidth is 160ms, send into the removing end Cr of counter, this hour counter begins counting, the binding hours of counting is 160ms, after the time of 160ms, the whole zero clearings of counter, if in the time of this 160ms, there are at least 16 pulses to enter the CP end, then positive pulse of the carry output terminal OC of counter output is to the silicon controlled control utmost point, trigger the controllable silicon conducting, because being added to the train of impulses of counter CP end is through the signal behind the pulse gate filter filtering, the all repetition frequencys not train of impulses in 110Hz～130Hz scope can not be passed through, and, make the total OC of counting that output be arranged, also must be to have at least 16 consecutive pulses to gang up in the time at 160ms, so, the identification circuit of alarm has had strong inhibitory effects to the radio signal that remaining various device on airport and the aircraft sends, as long as weather radar is not worked, it just can not reported by mistake, in addition, the time limit pulse producer is also controlled the instant alarming circuit alarm, as long as the pulse output of 160ms is arranged, instant alarming will send glittering signal, it and different being of identification alarm indication circuit, as long as alarm is received when certain microwave radiation or high power pulse are disturbed, will send alerting signal (but since when glittering compole short, have only 160ms, often can not cause user's attention).It does not represent that external microwave signal must be from airborne weather radar, and this alerting signal can be died away after the user breaks away from radiation area, and it can help the user to know whether oneself has broken away from radiation area, the rule of its signal flicker is bright 160ms, goes out about 8ms.The identification alarm indication only when confirming as the weather radar radiation, is just sent alerting signal, and in a single day this kind alerting signal is sent, and can not die away, and must could disappear after pressing the Reset button or switch through being used in.As seen by above-mentioned, the user is after being subjected to the microwave radiation of airborne weather radar, and two kinds of alerting signals can occur simultaneously, and the instant alarming signal can allow the user know whether the disengaging radiation area, and the identification alerting signal can be used for reminding the pilot to close weather radar.

The principle of work of self-checking circuit is: at ordinary times, the self check electric switch is an off-state, the removing end Cr of cc4060 is a high level, the crystal oscillator failure of oscillation, when needs check that the alarm performance is whether good, connect the self check electric switch, this moment cc4060 removing end Cr ground connection, be low level, the oscillator starting of oscillation that it is inner, produce the square-wave signal of 1.98MHz, through 14 grades of frequency divider frequency division output 120Hz, amplitude is that the square-wave signal of 5V is given differentiating circuit, by differentiating circuit with the square-wave signal differential, the spike pulse of output alternate positive and negative is to rectification circuit, the negative pulse of pruning the spike pulse string by rectification circuit, again the positive pulse string is defeated by shaping circuit, the positive pulse string is transformed into the rect.p. that pulsewidth is 20ms by spike pulse in shaping circuit, its amplitude is 5V, repetition frequency is 120Hz, through the rect.p. decay-80dB of attenuator, just formed the modulated pulse signal of simulation weather radar radiation again, be input to the input end of prime amplifier 5V, each components and parts performance as alarm is intact, then after this simulating signal input, the identification part branch of alarm sends identification alerting signal and instant alarming signal immediately, otherwise complete machine is not worked.

The utility model is compared its obvious improvement with the existing measure of taking precautions against the weather radar microwave radiation: when doing to guarantee with existing rules and regulations, provide a kind of portable miniature electronic panalarm for the airport ground staff again, it can be in incident, in time propose alerting signal, remind user's radiation area that speeds away to the user.This alarm volume is little, in light weight, a pocket radio size is only arranged, about 250 grams of weight, the power consumptive province, save the rechargeable battery powered of 3.6V with two, the maximum consumption electric current is less than 1.5mA, in addition, because the microstrip antenna, filtering 2V that have adopted narrow passband in the utility model make alarm under specific environment for use with the voltage comparator of interfering signal and specific measures such as identification circuit, can distinguish weather radar microwave radiation signal and other electromagnetic wave signal, reliable operation can not reported by mistake.This alarm reaches request for utilization in design fully, and on probation, respond well on the airport, is the equipment of carrying of airport ground staff healthy protect.

Concrete structure of the present utility model is provided by the following drawings and embodiment.

Fig. 1 is the structural principle synoptic diagram of airborne weather radar radiation alarm described in the utility model.

Fig. 2 is the electrical connection synoptic diagram of alarm identification and display part.

Fig. 3 is an alarm self check part electrical connection synoptic diagram.

With reference to the accompanying drawings the utility model is done below and described in further detail.

Referring to Fig. 1, the airborne weather radar radiation alarm is made up of high frequency, amplification, identification, demonstration, self check five major parts and power supply.HFS is made up of microstrip antenna 1 and wave detector 2, microstrip antenna 1 is connected as a single entity with the alarm casing, casing adopts common single face Ao copper printed-wiring board (PWB) to make, the feeding point of antenna connects the positive pole of detector diode in the wave detector 2, consider that airborne weather radar microwave radiation signal is very strong, so this machine adopts the direct detection formula.Amplifier section is by prime amplifier 3, one-level main amplifier 4, secondary main amplifier 5, voltage comparator 6 and pulse width widening circuit 7 serial connections constitute, the about 10dB of the amplification quantity of prime amplifier 3, it is the convenience of installing for circuit, reduce effects of distribution parameters, the about 35dB of the amplification quantity of one-level main amplifier 4, input signal is entered by end of oppisite phase, secondary main amplifier 5 is made up of the half of circuit of dual operational amplifier LM358, the about 35dB of amplification quantity, input signal enters from in-phase end, voltage comparator 6 also is made up of the half of circuit of dual operational amplifier LM358, the output terminal of homophase termination secondary main amplifier 5, end of oppisite phase be connected to one through the stabilivolt voltage stabilizing+the 2V DC voltage, it can be with the various undesired signal filterings less than 2V of prime, pulse width widening circuit 7 is made up of CMOS integrated package CC4047, is connected to AC coupling in the amplifier section between each amplifier.Referring to Fig. 2, identification division is made up of pulse gate wave filter 8, scale-of-two step counter 9 and time limit pulse producer 10, and the alarm indication circuit comprises that identification alarm indication 11 and instant alarming show 12.Pulse gate wave filter 8 is bandpass filter of a 110Hz～130Hz, mainly form by CMOS integrated circuit CC4528 and 1/3CC4073, scale-of-two synchronous counter 9 is CC4161, time limit pulse producer 10 is CC4047, it is a 160ms monostable circuit, the output terminal of pulse width widening circuit 7 in the input termination amplifier section of pulse gate wave filter 8, the output terminal of pulse gate wave filter 8 connects the back along trigger end-TR of the input end of clock CP of scale-of-two synchronous counter 9 and time limit pulse producer 10 respectively, the removing end of the output termination scale-of-two synchronous counter 9 of time limit pulse producer, also connect the base stage of triode 19 in the instant alarming display 11 simultaneously, the model of triode 19 is 3DK4, its collector connects a yellow light-emitting diode 20, the carry output terminal OC of counter 9 connects the control end of controllable silicon 21 in the identification alarm indication 11, the negative electrode of controllable silicon 21 also is connected to a reset switch 22, and the anode of controllable silicon 21 connects red light emitting diodes 23 and hummer 24 respectively.Referring to Fig. 1 and Fig. 3, self-checking circuit is by oscillator 13, frequency divider 14, differentiating circuit 15, rectification circuit 16, shaping circuit 17, attenuator 18 and self check electric switch 25 are formed, oscillator 13 and frequency divider 14 are that CC4060 integrated package (promptly 14 grades serial binary counter/frequency divider and oscillator) constitutes, the removing end Cr of CC4060 connects self check electric switch 25, the electric capacity of output termination differentiating circuit 15, the diode cathode of the output termination rectification circuit 16 of differentiating circuit 15, shaping circuit 17 is that a 1/3CC4073 constitutes with door, its input connects the output of rectification circuit 16, attenuator 18 is by potentiometer, electric capacity and two 3K metalfilmresistors constitute, one of them is inclined to one side value resistance, the output signal of shaping circuit 17 connects the input of the potentiometer in the attenuator 18, the output of attenuator 18 connects detector diode in prime amplifier 3 and the wave detector 2 respectively, for self-checking circuit, can regulate its damping capacity by the potentiometer in the regulated attenuator 18, make it just equal the amplification quantity of amplifier section.

The power supply of this alarm adopts the rechargeable battery powered of two joint 3.6V, and has the charging jack, and its actual operating voltage can be between 6V～10VDC.This machine except that power switch, reset switch, self check switch and two demonstrations with the light emitting diode, all components and parts all are contained in the airtight casing.

Claims

A kind of airborne weather radar radiation alarm, it is to be amplified and the amplifier section of broadening by the HFS that is used for the received pulse modulated microwave signal, pulse signals, and train of impulses identification division, alarm indication part and the self check that can produce simulation weather radar modulated pulse signal are partly and the power supply composition; HFS is made of a microstrip antenna that is connected as a single entity with casing (1) and wave detector (2), amplifier section comprises one-level prime amplifier (3), secondary main amplifier (4,5), one-level voltage comparator (6) and the one-level pulse width widening circuit (7) of series connection successively, and alarm indication comprises that partly identification alarm indication (11) and instant alarming show (12); The input end of the wave detector of HFS (2) output termination amplifier section one-level prime amplifier (3); It is characterized in that:

(1) identification division is by one-level pulse gate wave filter (8), one-level scale-of-two synchronous counter (9) and one-level time limit pulse producer (10) constitute, the output terminal Q of pulse width widening circuit (7) joins in the input end of pulse gate wave filter (8) and the amplifier section, the output terminal of pulse gate wave filter (8) respectively with back the joining of the input end of clock CP and the time limit pulse producer (10) of scale-of-two synchronous counter (9) along trigger end-TR, discern controllable silicon (21) control end of alarm indication (11) in the carry output terminal CP display part taking alarm of scale-of-two synchronous counter (9), control light emitting diode (23) and hummer (24) send alerting signal, in addition, on controllable silicon (21) negative electrode, also be connected to a reset switch (22); The removing end of the output termination scale-of-two synchronous counter (9) of time limit pulse producer (10), simultaneously also with alarm indication part in instant alarming show that switch triode (19) base stage of (12) joins the luminous warning of light emitting diode (20) of starting instant alarming;
(2) self check partly is by oscillator (13), frequency divider (14), differentiating circuit (15), rectification circuit (16), pulse shaping circuit (17), attenuator (18) and self check electric switch (25) are formed, their electrical connection is: the removing end Cr of oscillator (13) and frequency divider 14 connects self check electric switch (25), the input end of the output termination differentiating circuit (15) of frequency divider (14), the input end of the output termination rectification circuit (16) of differentiating circuit (15), the input end of the output termination shaping circuit (17) of rectification circuit (16), the input end of the output termination attenuator (18) of shaping circuit (17), the output terminal of attenuator (18) connect the wave detector (2) of HFS and the prime amplifier (3) of amplifier section respectively;
(3) end of oppisite phase of voltage comparator (6) is connected to a reference voltage (26) in the amplifier section.