CN2233645Y - Multipoint transmitting and receiving system - Google Patents

Abstract

The utility model relates to a multipoint transmitting and receiving device which is a transmitting and receiving device used for urban automobile dynamic fixed-point positioning system. The utility model is composed of a transmitter and a receiver, wherein, the transmitter is composed of an encoder, a modulator, a high-frequency amplifier and a transmitting antenna, the receiver is composed of a receiving antenna, a band-pass filter, a digital demodulator and a code judging device, the encoder adopts an ED 5026 circuit, the modulator adopts an MC2833 circuit, the digital demodulator adopts an MC3367 circuit, and the code judging device adopts an 8031 CPU and can remotely control the transmitter to emit the codes of different states. The multipoint transmission and the multipoint reception can be realized. The utility model has the characteristics of reliable operation, high sensitivity, low cost, etc.

Description

Multi-multipoint transceiver

The utility model is a kind of sending and receiving apparatus that is used for the dynamic fixed point location of city automobile system, belongs to the anti-alarm technique field of robbing of vehicle anti-theft.

It is a lot of to be used for the transceiver kind that vehicle anti-theft reports to the police at present, but they all are to be used in one independently in the system, adopts some the mode to a bit, i.e. the corresponding receiver of reflector.When reflector transmits, have only corresponding receiver can receive signal, this type of transceiver generally adopts tuning fork amplitude modulation circuit or adopts the coding of pairing, decoding circuit to realize.For the dynamic fixed point location of city automobile system, need a kind of can multiple spot emission sending and receiving apparatus that multiple spot is received, existing transceiver can't be realized the location to many moving vehicles.

The purpose of this utility model is at the deficiencies in the prior art, a kind of transceiver that can be applicable to the multiple spot emission of the dynamic fixed point location of city automobile system to the multiple spot reception is provided, it both can solve the problem of co-channel interference of many moving vehicles at same anchor point, can reduce the transmitting power of reflector again.

The utility model can be made up of reflector and receiver, be characterized in that reflector is made of encoder, modulator, high-frequency amplifier and transmitting antenna, receiver is made of reception antenna, band pass filter, digital demodulator and code distinguish device, the number that encoder sends is after the modulation and frequency multiplication of modulator, amplifying the back by high-frequency amplifier is again exported by transmitting antenna, the number that reception antenna receives is after low pass filter filtering and digital demodulator demodulation, send code distinguish device, code distinguish device adopts cpu circuit.Encoder can adopt MC5026 or ED5026 circuit, and modulator can adopt MC2831 or MC2833 circuit.Digital demodulator can adopt the MC3367 circuit.Cpu circuit can be 8031 circuit, and it has easy exploiting and low cost and other advantages.The MC5026 encoder is except having the data pilot sign indicating number, all have one to have the information code that goes up the jumping edge before each code element, the ratio of information code and code element is 1: 6, utilizes upward jumping along can be used as of information code to declare the synchronous usefulness of sign indicating number, help eliminating the cumulative errors of multi-position code, guaranteed to declare the correctness of sign indicating number.Because encoder is subjected between one the control of breath oscillator simultaneously, between a breath vibration, the breath time also is 1: 6, promptly sends out a set of symbols, sends out a set of symbols again after waiting for time of 6 set of symbols, thereby can avoid the co-channel interference of many vehicles at same anchor point.The MC2833 frequency modulator is a monolithic frequency-modulated transmitter, has characteristics such as operating voltage range is wide, volume is little, reliable and stable, and frequency source adopts quartz oscillator.The MC3367 digital demodulator is a kind of low-power consumption narrow-band FM intermediate-frequency circuit, and inside comprises element circuits such as oscillator, frequency mixer, limiting amplifier, frequency discriminator, low-pass active filter and squelch switch.

The utility model compared with prior art, it not only can solve the problem that multiple spot emission receives multiple spot, and owing to cease signaling between adopting, thereby has solved the problem of co-channel interference of many vehicles at same anchor point.Because receiver has adopted highly sensitive MC3367 integrated circuit, has reduced the requirement of reflector to transmitting power, not only helps reducing the cost of reflector, and can reduce the pollution to air communication.

Fig. 1 is a frame structure schematic diagram of the present utility model; Fig. 2 is the circuit theory schematic diagram of reflector embodiment; Fig. 3 is the circuit theory schematic diagram of receiver embodiment; Fig. 4 is the emitter control circuit schematic diagram.

The utility model can take scheme shown in the drawings to realize.Encoder among Fig. 1 (1) and modulator (2) and high-frequency amplifier (3) can adopt circuit shown in Figure 2; High-frequency amplifier (3) can adopt conventional amplifier, the high-frequency amplifier that for example adopts preamplifier and power amplifier to constitute.Transmitting antenna (4) and reception antenna (5) can adopt whip antenna, stripline antenna or wire antenna.Band pass filter (6) can adopt ceramic filter, receiver can adopt circuit arrangement shown in Figure 3, the alarm signal that receiver receives enters digital demodulator (7) and restores true form behind broadband amplification, bandpass filtering network filtering, after shaping, import code distinguish device (8), finish judgement transmitter code by it.Integrated circuit U2-1 among Fig. 2 adopts the MC5026 coding circuit, and resistance R 2-1 is 5026 frequency modulation(FM) resistance, and the big more sign indicating number of resistance speed is low more.For fear of co-channel interference at same anchor point, can between being provided with between 13 pin of power supply and U2-1, cease oscillator, it can be made of two gate circuit U2-2 and U2-3,13 pin of its output termination U2-1, the breath signaling was 1: 6 scope between control U2-1.Between breath oscillator control between the breath sign indicating number output to the base stage of transistor T 2-1 by 17 pin of U2-1, the 3rd pin of after T2-1 paraphase shaping, being defeated by U2-4, U2-4 can adopt the MC2833 circuit, inductance L 2-1 and crystal oscillator CR2-1 formation oscillating circuit.Modulating wave, is launched by antenna through arriving high-frequency amplifier (3) after the frequency tripling filtering by the 14 pin output of U2-4 again.Trebling circuit can obtain higher operating frequency and bigger frequency deviation.Reception antenna AN among Fig. 3 is connected with the 3rd pin of U3-1 through capacitor C 1, U3-1 can adopt the MC3367 circuit, it is a kind of low-power consumption narrow-band FM intermediate-frequency circuit, and inside comprises element circuits such as oscillator, frequency mixer, limiting amplifier frequency discriminator, low-pass active filter and squelch switch.The oscillating circuit of MC3367 is the bikini oscillating circuit, and C6 is a decoupling capacitance; Crystal oscillator CR3-1 and C4, C5 constitute oscillating circuit; The fine-tuning frequency of oscillation of C2, L2; C3 is a coupling capacitance.Circuit adopts a mixing mode signal behind frequency-selective network, together imports MC3367 the 3rd pin with local oscillation signal and carries out mixing.Intermediate-freuqncy signal after the mixing is exported by MC3367 the 2nd pin, enter MC3367 the 23rd pin again by ceramic filtering F2 and carry out the amplification of first order intermediate frequency, amplified IF signal enters MC3367 the 28th pin again and carries out the intermediate frequency amplification second time behind ceramic filter F1, the gain of whole intermediate-frequency channel is greater than 60dB, and the frequency of F1, F2 can be 445K.LC3-1, C3-11 and R3-3 constitute phase-shift network, the instantaneous frequency of the FM signal of intermediate-freuqncy signal are changed being converted to phase change.After the signal demodulation, enter the second order active low-pass filter, the input that is exported to U3-2 by MC3367 the 15th pin is declared sign indicating number.Code distinguish device is made of U3-2, U3-3 and U3-4, and wherein U3-2 can adopt 8031CPU, and U3-3 can adopt latch 373 circuit, and U3-4 adopts memory 2732 circuit.

Be in which kind of protection (the anti-misfortune or anti-theft early-warning) state for the ease of presetting at any time or changing vehicle, reflector can also adopt wireless remote mode to realize except the switch that adopts various structures is controlled.Fig. 4 is the embodiment circuit theory diagrams of emitter control circuit, it is made of three transistor Ts 6, T7 and T8, anti-trigger switch K1, antitheft trigger switch K2, relay J and the remote controller YK of robbing, the collector of T8 is connected with the collector of T6, the emitter of T8 is connected with the base stage of T7, the base stage of T8 is connected with the control end of the receiver of remote controller, for example A holds, and the collector of T7 is connected with relay J.When the control of remote controller end was high level, T8 was in open mode, and make reflector be in the anti-theft early-warning state this moment.In case starting, antitheft trigger switch K2 make it become the 0V low level, then the collector electrode of T6 uprises level, thereby connect T7 by T8, make the contact J1 of relay J and J2 closure and energized Vcc, reflector is in running order, while control end A is by the conditional code end b (be the 2nd pin among the figure, can set arbitrarily voluntarily) of the encoder 5026 of line b and reflector, thereby the conditional code of launching vehicle.Receiver receives that conditional code is " 1 ", is declared sign indicating number and is learnt that certain vehicle is in stolen state by CPU.When the control of remote controller end is in low level, T8 is in closed condition, T7 disconnects all the time, reflector is removed anti-theft early-warning and is in the anti-alert status of robbing, and has only this moment to start the anti-trigger switch K1 that robs, and just can open transmitter power, the control end low level passes to 5026 conditional code ends, launch conditional code, receiver receives conditional code " 0 ", and CPU judges that certain vehicle is in the state of being robbed.Remote controller YK can adopt the plain edition remote controller, it is made of receiver of remote-control sytem and remote control transmitter, arbitrary end A on the receiver of remote-control sytem, B, C, D can be as control end, and the arbitrary end on 5026 encoders also can be used as the conditional code end, and only needing in advance, agreement gets final product.Remote control transmitter by the vehicle driver with, after leaving vehicle and closing entrance door, can press down the A key of remote control transmitter, open car door or broken window is gone into car etc. if any the people is improper at this moment, promptly connect antitheft trigger switch K2, reflector promptly can send stolen conditional code.If stolen situation do not occur, when returning, the driver can press down earlier other key of remote control transmitter, and making control end A is low level, can remove the anti-theft early-warning state.

Claims (4)

1. multi-multipoint transceiver that is used for the dynamic fixed point location of city automobile system, form by reflector and receiver, it is characterized in that reflector is made of encoder, modulator, high-frequency amplifier and transmitting antenna, receiver is made of reception antenna, band pass filter, digital demodulator and code distinguish device, the number that encoder sends is after the modulation and frequency multiplication of modulator, amplifying the back by amplifier is again exported by transmitting antenna, reception antenna receives digital after band-pass filter and digital demodulator demodulation, send code distinguish device, code distinguish device adopts cpu circuit.

2. multi-multipoint transceiver according to claim 1 is characterized in that encoder adopts the MC5026 circuit, and modulator adopts the MC2833 circuit, and digital demodulator adopts the MC3367 circuit, and cpu circuit adopts 8031 circuit.

3. multi-multipoint transceiver according to claim 1 and 2 is characterized in that encoder adopts the ED5026 circuit, and this circuit is subjected to the control of breath oscillator between.

4. multi-multipoint transceiver according to claim 1 and 2, it is characterized in that reflector is provided with the reflector controller, constitute by three transistor Ts 6, T7 and T8, anti-trigger switch K1, antitheft trigger switch K2, relay J and the remote controller YK of robbing, the collector of T8 is connected with the collector of T6, the emitter of T8 is connected with the base stage of T7, the base stage of T8 is connected with the control end of the receiver of remote controller, and the collector of T7 is connected with relay J.

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