CN209447172U - A kind of vehicle electric sub-mark read-write effective coverage range test device - Google Patents

Abstract

The readwrite performance of vehicle electric sub-mark, which is tested, at present is mainly, a part of tester drives the automobile for carrying electronic mark, another part tester connects its coverage area of read-write equipment actual test by software, to reduce difficulty of test, the utility model proposes a kind of vehicle electric sub-marks to read and write effective coverage range test device, the test equipment includes microstrip antenna, phaselocked loop, 3db coupler, diode detection circuit, baseband signal zoom comparison circuit, CPU, acousto-optic indicating unit and power supply, successively pass through 3db coupler by the received data of eating dishes without rice or wine of microstrip antenna, diode detection circuit and baseband signal zoom comparison circuit evolving digital signal, CPU is used to for digital signal to be generated as control signal, acousto-optic indicating unit carries out acousto-optic instruction according to control signal, phaselocked loop is for providing local oscillator letter Number.The wherein model LM2541 that phaselocked loop uses.The model LPC4357 that CPU is used.

Description

A kind of vehicle electric sub-mark read-write effective coverage range test device

Technical field

The utility model belongs to RFID device field, and especially a kind of vehicle electric sub-mark read-write effective coverage range is surveyed Trial assembly is set.

Background technique

Motor vehicle electronic identity management system is that a set of of Ministry of Public Security's implementation relates to vehicle management system, by pacifying on motor vehicle It fills electronic mark (RFID label tag) and realizes inspection and the condition monitoring to information of vehicles in road surface arrangement read-write equipment.It is motor-driven Vehicle electronic mark uniformly carries out hair fastener by various regions traffic control department, and installation and deployment pass through peace on the motor vehicle for needing to be managed Read-write equipment on trackside and L bar carries out data acquisition.With reference to providing in national standard, the performance measure standard of read-write equipment is To effective reading/writing distance of electronic mark, it is divided into static read-write and dynamic recognition performance is carried in the project acceptance inspection using automobile The mode of electronic mark measures actual reading/writing distance, carries out road closure and the continuous adjustment of vehicle, expends a large amount of manpower And material resources.

The readwrite performance test of vehicle electric sub-mark at present, which is mainly that a part of tester drives, carries electronic mark Automobile, another part tester connects its coverage area of read-write equipment actual test by software, and when test needs to coordinate Vehicle occupies several testers, carries out the work such as close a road to traffic, and needs to drive a car in test process and is repeatedly turned around or fallen Vehicle movement, testing efficiency is lower and there are certain risk.

Utility model content

The utility model proposes a kind of vehicle electric sub-marks to read and write effective coverage range test device, the technical side of use Case is as follows:

A kind of vehicle electric sub-mark reads and writes effective coverage range test device, the test equipment include microstrip antenna, Phaselocked loop, 3db coupler, diode detection circuit, baseband signal zoom comparison circuit, CPU, acousto-optic indicating unit and power supply, Successively pass through 3db coupler, diode detection circuit and baseband signal zoom comparison electricity by the received data of eating dishes without rice or wine of microstrip antenna Road generates digital signal, and CPU is used to for digital signal being generated as control signal, and acousto-optic indicating unit is according to control signal carry out sound Light instruction, phaselocked loop is for providing local oscillation signal.

Wherein, the model LM2541 that phaselocked loop uses.The model LPC4357 that CPU is used.

Diode detection circuit includes the 3dbm electric bridge being sequentially connected, the combining for local oscillation signal and reverse signal；Inspection Wave diode, for extracting baseband signal；Switch receives reverse signal for cooperating equipment, between detector diode and switch It is also connected with resistance and capacitor, capacitor and resistance are used for the impedance matching of signal link.

Compared with prior art, the utility model has the beneficial effects that: the utility model proposes test equipment, can be with Information of eating dishes without rice or wine by parsing motor vehicle electronic mark read-write equipment determines whether read-write equipment works normally；Make entirely to test stream Journey is more convenient, is not needing operating motor vehicles that test can be completed, by repeatedly with the contrast test of traditional approach, demonstrate,proving Bright test result of the present invention is reliable and stable.

Detailed description of the invention

Fig. 1 is test device work flow diagram；

Fig. 2 is test device structure chart；

Fig. 3 is diode detection electrical block diagram；

Fig. 4 is reversed base band zoom comparison electrical block diagram.

Specific embodiment

In the present embodiment, as shown in Figure 1 and Figure 2, the test equipment of proposition includes 4 parts, respectively,

Antenna: the part is used to receive the forward signal of read-write equipment, and in the present embodiment, antenna uses microstrip antenna, day Line is connect by the microstrip line on PCB with data processing unit；

Data processing unit: mainly the received data of complete twin aerial carry out demodulation zoom comparison for the part, and generate Digital signal (control signal), specifically includes

1, phaselocked loop: phaselocked loop uses LM2541, provides the local oscillation signal of system, and frequency point is controlled by CPU, and default frequency point is 922.625MHz；

2,3db coupler: it is mainly used for for local oscillation signal and data of eating dishes without rice or wine being combined；

3, diode detection circuit: this part is made of Schottky diode, capacitor, inductance and resistance, utilizes diode One-way conduction, the low frequency signal in ultra-high frequency signal is extracted, as shown in figure 3, the partial circuit include 3dbm electricity Bridge: for the combining of local oscillation signal and reverse signal, to be demodulated in the diode；Detector diode: for extracting base Band signal；Switch control: when start to receive reverse signal for control system；Resistance and capacitor: it is mainly used for the resistance of link Anti- matching；

4, baseband signal zoom comparison circuit: after signal passes through diode detection circuit, pass through two-stage differential operation amplifier Device carries out signal amplification, is then compared with 5V level by comparator, export final digital signal (controlling signal) to CPU carries out processing comparison, as shown in figure 4, the partial circuit includes operational amplifier: for the baseband signal amplification after demodulating； RC filter unit: for reducing the climbing phenomenon of signal, keep the input signal of comparator gentler, the property of signal resolution is turned up Energy；Comparator: according to the comparison result of baseband signal and threshold value, output digit signals enable CPU correctly to parse needs Data；

5, CPU part: in the present embodiment, CPU uses the LPC4357 of the Pu En Zhi company, is based in ARM-Cortex-M4 The microcontroller of core, this CPU mainly complete the parsing of data, the control of phaselocked loop, the control of acousto-optic indicating circuit, the CPU Function further includes selection data parsing rate；

Acousto-optic indicating section indicates test equipment by green light, red light and buzzer according to the control signal that CPU is generated Working condition, buzzer have frequency sounding indicate system start to work normally, green light expression receive correct data, it is red The bright expression of lamp receives signal but parses error in data, and traffic lights, which all extinguish, to be indicated not receiving any data；

Power management section, system are powered using the packed cell of direct current 9V, convert electricity by power supply inside test equipment 9V electricity is converted to direct current 5V, 3.3V and 2.5V and used to each section circuit by road.

Technical principle of the utility model has been described above with reference to specific embodiments, these descriptions are intended merely to explain this reality With novel technical principle, and it cannot be construed to the limitation to scope of protection of the utility model in any way.It is explained based on this, Those skilled in the art do not need to pay for creative labor other specific embodiment parties that can associate the utility model Formula all will fall within the protection scope of the utility model.

Claims (4)

1. a kind of vehicle electric sub-mark reads and writes effective coverage range test device, which is characterized in that including microstrip antenna, locking phase Ring, 3db coupler, diode detection circuit, baseband signal zoom comparison circuit, CPU, acousto-optic indicating unit and power supply, by micro- It is raw that the band received data of eating dishes without rice or wine of antenna successively pass through 3db coupler, diode detection circuit and baseband signal zoom comparison circuit At digital signal, CPU is used to for digital signal being generated as control signal, and acousto-optic indicating unit carries out acousto-optic according to control signal and refers to Show, phaselocked loop is for providing local oscillation signal.

2. a kind of vehicle electric sub-mark reads and writes effective coverage range test device as described in claim 1, which is characterized in that lock The model LM2541 that phase ring uses.

3. a kind of vehicle electric sub-mark reads and writes effective coverage range test device as claimed in claim 2, which is characterized in that The model LPC4357 that CPU is used.

4. a kind of vehicle electric sub-mark reads and writes effective coverage range test device as claimed in claim 3, which is characterized in that two Pole pipe detecting circuit includes the 3dbm electric bridge being sequentially connected, the combining for local oscillation signal and reverse signal；Detector diode is used In extraction baseband signal；Switch receives reverse signal for cooperating equipment, is also connected with resistance between detector diode and switch And the impedance matching of capacitor, capacitor and resistance for signal link.