CN2372201Y - Automobile theft-proof alarm based on surface acoustic wave identification technology - Google Patents

Abstract

The utility model relates to an automobile theft-proof alarm on the basis of surface acoustic wave identification technology. The utility model has the technical key point that an automobile detection unit, an alarm display unit, a transmitting unit and a receiving and decoding unit are connected with a control unit of a single chip computer; an antenna can selectively switched on with the transmitting unit or the receiving and decoding unit under the control of the single chip computer through a switch. The utility model has the advantages of safe theft-proof function, low cost and high real-time performance and is convenient to immediately discover stolen automobiles.

Description

A kind of car alarm based on surface acoustic wave sign recognition technology

The utility model relates to a kind of alarms and security systems for automobiles, particularly a kind of car alarm based on surface acoustic wave sign recognition technology.

At present, automobile burglar aspect prior art has: (1). (2) .GPS receiver tracking location such as door coded lock, Circuit lock.The GPS receiver is hidden in somewhere in the car, intermittently reports the position of GPS receiver carrier to supervisory system.(3). the wireless receiving cell site is set within the specific limits, and reception, emission and engine control circuit are installed on automobile.When automobile rolled the driving range of car owner's setting away from, control circuit made automobile stop to travel automatically.Although public security department to the vehicle such as automobile made coding, management work such as issue permit, register the license, after the car owner reports lost property to the authorities to lost vehicles,, in most cases but can not be identified rapidly even lost vehicles still haunts losing the highway section.Its major cause is that vehicle flowrate is big, long, the artificial reaction of coding figure place is slow, human brain is limited to the car coded memory, car appearance similar etc.In recent years, the GPS global positioning system had been brought into play great role aspect automobile burglar.But multifactorly make it in automobile burglar, not be used widely because higher, the communication of GPS receiver price, maintenance etc. are all.

The purpose of this utility model provides a kind of theftproof performance novel automobile anti-theft device reliable, cheap, easy to use, to overcome the deficiencies in the prior art.

Implementation procedure of the present utility model:

Accompanying drawing 1 is a constructional drawing of the present utility model;

Accompanying drawing 2 is the utility model example structure figure;

As shown in Figure 1, vehicle detection of the present utility model unit, alarm indication unit, send out Penetrate the unit, the receipt decoding unit is connected with the Single-chip Controlling unit respectively, antenna exists by switch Alternative and transmitter unit or the connection of receipt decoding unit under the Single-chip Controlling.

The surface acoustic wave responder is installed on the automobile, and each vehicle can be installed 3 to 5 or more Individual surface acoustic wave responder. And the several responders that are used on same the car are same at coding Group is differentiated all responder codings that solve after the decoding of this alarm, to determine Whether belong to stolen vehicle by vehicle. The surface acoustic wave responder sends receiving this alarm Electromagnetic pulse after, send the electromagnetic pulse sequence that comprises the vehicle coded message. Make thereon The reflection bar with encode identification information if the n bar is arranged, can identify 2ⁿIndividual sign object.

The encoding scheme of surface acoustic wave responser: the coding of surface acoustic wave responser should be able to reflect the number of responser in the difference numbering, every group of each responser in the group, every group of responser.The coding techniques of surface acoustic wave responser belongs to prior art, can consult document: L.Reindl, W.Ruile, Programmable Reflectors for SAW-ID-Tags, IEEEUltrasonics Symp.1993, pp125-130.As will be the most preceding 1 with last 1 as initial with finish, the 2nd to the 33rd bit representation group (can represent 232 groups), the 34th each responser numbering (can represent 16 numberings) in same group of the 37th bit representation.The 38th responser numbering number (can represent 32 numberings) in same group of the 42nd bit representation.This encoding scheme is shared 43 encoding strips.First encoding strip of each responser apart from difference, makes the transponder pulse non-overlapping of each responser apart from interdigital transducer in same group, is convenient to the coding that this Car Burglar Alarm is discerned each responser.

The surface acoustic wave responser is hidden in the automobile car dispersedly, and chaufeur is carried a surface acoustic wave responser.The surface acoustic wave responser that requirement is installed in the car is hidden in non-electromagnetic screening point.

Whether this Car Burglar Alarm is differentiated by vehicle is the algorithm of stolen vehicle: whether the group of responser is identical, if different, then reports to the police; Whether decoding gained responder coding number equates with this group responder coding number of extracting from responder coding, if do not wait, then reports to the police.

Vehicle inspection and test of the present utility model unit can use other mature technologys such as infrared detection technology.When automobile passed through, vehicle inspection and test unit triggers transmitter unit sent the electromagnetic pulse that is used to inquire, and receives the electromagnetic pulse sequence of surrounding environment reflected back and the electromagnetic pulse sequence that comprises the automobile coded message that responser is beamed back then.Decoding unit is decoded, and the result is passed to micro controller system.Control and recognition result that micro controller system is responsible for whole Car Burglar Alarm show.If find stolen vehicle, the alarm of then ringing is accused lost vehicles and is occurred.

Car Burglar Alarm described in the utility model can be applicable to a big government zone and divides the antitheft of automobile or all automobiles as a country, a urban inner.The surface acoustic wave responser is installed on the automobile, this Car Burglar Alarm is installed on the check point, the technical program adopts Car Burglar Alarm to initiatively inquiring with electromagnetic pulse by vehicle, be installed in passive the replying of a plurality of surface acoustic wave responsers on the automobile, Car Burglar Alarm differentiates whether belong to stolen vehicle by vehicle fast to the identification of decoding of the response message of surface acoustic wave responser afterwards.When the vehicle passing detection point of surface acoustic wave responser is installed, vehicle detector has perceived vehicle to be passed through, triggering this Car Burglar Alarm sends electromagnetic pulse and inquires, be installed in the responser that responser on the automobile and chaufeur carry and beam back response message, after interrogator is received the response message of responser, identify each responser coded message separately, finish anti-theft alarm function.If the part automobile has been installed responser in the administrative region, as long as also have a responser not go to pot onboard, stolen vehicle can be detected by check point the time.If all automobiles have all been installed responser in the administrative region, if being inquired vehicle does not have response, vehicle neither one responser is inquired in explanation or all responsers are all damaged, this Car Burglar Alarm is reported to the police at once, the attendant endures strict scrutiny to suspect vehicle immediately, whether belongs to stolen vehicle to examine this vehicle.

Set up a plurality of check points that interrogator is installed, set up the automobile burglar monitor network, just can in a big territorial scope, solve the stolen problem of vehicle.The actual vehicular theft-prevention monitoring network that uses can be implemented by the automobile burglar club of enterprise's foundation or by public security organ.

An embodiment of the present utility model: as shown in Figure 2, transmitter unit, receive decoding unit and aerial circuit and adopt document: Leonhard Reindl, Gerd Scholl et al, Theory and Application of Passive SAW Radio Transponders asSensors, IEEE Trans.On Ultrason., Ferro.And Freq.Control, Vol.45, NO.5,1998, the circuit that pp1281-1291 provides, the detecting test of vehicle unit adopts infrared detector, infrared detector, the alarm display unit, transmitter unit, receive decoding unit and be connected with the Single-chip Controlling unit respectively, antenna is connected with transmitter unit or reception decoding unit by switch is alternative under Single-chip Controlling.The information device investigative range can be adjusted to 10 meters from 0.2 meter, and corresponding with it, frequency of operation can be adjusted to about 400MHz from 2.7GHz, and emissive power is 25dBm.

Advantage of the present utility model and good effect: 1, anti-theft feature is safe and reliable, each vapour The responder number of installing on the car can be different, are hidden in dispersedly in the car everywhere, and the driver exists Carry the part responder during from car. All are replied in the car so that the robber can't find at short notice Device. As long as also have a responder not go to pot onboard, stolen vehicle can be detected. 2, this alarm is installed in highway sentry post, various places etc. and locates, so that lost vehicles can't shift, Pass by and even use. Wholely inquire, identify realized full-automatic, accurately fast. 3, become This is cheap. Interrogator is a signal and takes place and receiver, and rear connection pulse continues the row identification circuit, Cheap. Every passive sonic surface wave responder cost is about 10 yuan. It is 4, real-time, Be convenient to find immediately stolen vehicle.

Claims (1)

1, a kind of car alarm based on surface acoustic wave sign recognition technology, it is characterized in that: detecting test of vehicle unit, alarm display unit, transmitter unit, reception decoding unit are connected with the Single-chip Controlling unit respectively, and antenna is connected with transmitter unit or reception decoding unit by switch is alternative under Single-chip Controlling.