CN104076347B - Vehicle space locating system based on ultrasonic waves - Google Patents

Vehicle space locating system based on ultrasonic waves Download PDF

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Publication number
CN104076347B
CN104076347B CN201410297970.2A CN201410297970A CN104076347B CN 104076347 B CN104076347 B CN 104076347B CN 201410297970 A CN201410297970 A CN 201410297970A CN 104076347 B CN104076347 B CN 104076347B
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China
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pin
module
connects
control chip
main control
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CN104076347A (en
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张凯
程登良
刘熙民
王鹏
陈恢妹
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Hubei University of Automotive Technology
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Hubei University of Automotive Technology
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/18Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using ultrasonic, sonic, or infrasonic waves
    • G01S5/30Determining absolute distances from a plurality of spaced points of known location

Abstract

The invention relates to a vehicle space locating system based on ultrasonic waves. The vehicle space locating system comprises a master control chip, a transmitting module, a receiving module, a switching-over processing module, a control input module, a serial port screen display module and a power source. The master control chip is connected with the transmitting module, the switching-over processing module and the control input module through GPIO ports, and meanwhile is in connection and communication with the serial port screen display module through an SCI. The master control chip is provided with a power management module and is connected with the power source through the power management module. The receiving module is connected to the switching-over processing module and is connected with the master control chip through the switching-over processing module. The vehicle space locating system is simple and reasonable in structural design and stable in running, error correction can be carried out on a locating position, final locating information reliability can be effectively improved, and accurate vehicle space locating can be achieved.

Description

Vehicle space alignment system based on ultrasonic wave
Technical field
The present invention relates to vehicle space field of locating technology, more particularly, to a kind of vehicle space positioning system based on ultrasonic wave System.
Background technology
Toa (time of arrive) type positioning, ap (access point) signal positioning and gps (global Position system) positioning is current main in the world three big indoor positioning technologies.Toa is radio frequency range finding common at present Technology, its principle is to obtain the distance between sender and recipient by measuring the electric signal transmission time, in applying indoors, Serious multipath and non line of sight phenomenon cause range error larger;Ap positioning is to be positioned under this network coverage by wireless signal The position of all equipment using this network, its shortcoming is that positioning precision is poor;Gps positioning is to be moved according to sky aerial high-speed Satellite instantaneous position, as known known date, using the method for space length resection, determines the position of tested point, its Shortcoming is that indoor acceptable effect is poor.In sum, existing positioning mode ratio affected by environment is larger, and positioning is unstable and has Than larger error.Therefore research and utilization ultrasonic wave carry out local to be accurately positioned is necessary.The handles such as the f-tong in Hong Kong Ultrasonic wave Precise Position System is applied on self-control navigation vehicle, carries out navigation research.Chen Yong light etc. have studied passive TDOA location The relation of principle and positioning precision, also bear Chun-shan Mountain etc. improved using the method that peak count and zero cross point detect ultrasonic The precision of range finding is to realize being accurately positioned.
Content of the invention
The present invention is that there is certain defect to solve existing vehicle space positioning system structure design, ratio affected by environment Larger, positioning is unstable and error is larger it is impossible to effective realize the pinpoint problem to vehicle space and propose a kind of structure Design is simple, reasonable, stable, positioning can be put and just carry out error bridge, can effectively improve the reliability of final location information, Realize the pinpoint vehicle space alignment system based on ultrasonic wave in local space for the vehicle.
The present invention is achieved by the following technical solutions:
The above-mentioned vehicle space alignment system based on ultrasonic wave, including main control chip, transmitter module, receiver module, turns Connect processing module, control input module, serial ports screen display module and power supply;Described main control chip is connected respectively by gpio port Described transmitter module, switching processing module and control input module, simultaneously also by serial ports sci and described serial ports screen display module Connection communication;Described main control chip is provided with power management module, and it passes through described power management module and connects described power supply;Described Receiver module is connected to described switching processing module and is connected with described main control chip by described switching processing module;Described control Input module processed receive the outside control operation to system and by operating result be converted into the discernible information of system deliver to described Main control chip;Described transmitter module receives the control command of described main control chip transmission and sends ultrasonic wave, described receiver module Receive the ultrasonic wave that described transmitter module sends;When described main control chip obtains having no progeny in the reception that described receiver module sends, Described main control chip is given described switching processing module control signal and controls described switching processing module to connect described receiver module The data received is converted into the signal that described main control chip can receive and delivers to described main control chip, and described main control chip is according to reception Result is calculated corresponding position coordinates and delivers to described serial ports screen display module after treatment, and described serial ports screen shows mould Result is shown by block.
The described vehicle space alignment system based on ultrasonic wave, wherein: described main control chip is by described serial ports sci Baud rate data form and described serial ports screen display module are set to unanimously, to realize proper communication;Described serial ports screen display Show that module is to instruct accordingly by touch-control configuration setting to send data to described main control chip.
The described vehicle space alignment system based on ultrasonic wave, wherein: described main control chip uses Tms320f28027 chip and be additionally provided with for produce 40khz square wave and for timing timer, its pass through described serial ports sci Fifo interrupt mode accept the data that sends over of described serial ports screen display module and be saved in corresponding array, meanwhile, Described main control chip sends data to described serial ports screen display module with the fifo query pattern of described serial ports sci.
The described vehicle space alignment system based on ultrasonic wave, wherein: described transmitter module is by resistance r1 ~ r3, triode P1, transformer t1, ultrasonic transmitter us-tx, FET n1 and contact pin p connect composition;Described resistance r2 one end is connected with Cut off terminal, the other end is connected to the base stage of described triode p1;Described cut off terminal is connected to described main control chip Gpio port, for repercussions suppression;The emitter stage of described triode p1 connects 5v power supply, and the colelctor electrode of described triode p1 leads to Cross described resistance r1 and connect No. 2 ports of described contact pin p and the negative pole end of described transformer t1 primary coil, described transformation respectively The positive terminal of device t1 primary coil connects 5v power supply;Described ultrasonic transmitter us-tx is connected to described transformer t1 secondary wire Between the both positive and negative polarity of circle;The source electrode of described FET n1 is connected to No. 1 port of described contact pin p, grounded drain, and grid connects There is send ctrl terminal;Described send ctrl terminal is connected with the ultrasonic pulse signal emission port of described main control chip, And the control signal of 40khz ultrasonic pulse is produced by the ultrasonic pulse signal emission port input of described main control chip;Institute State resistance r3 one end ground connection, the other end connects described send ctrl terminal.
The described vehicle space alignment system based on ultrasonic wave, wherein: described contact pin p is in short during normal use Connect state;Described triode p1 uses pnp triode.
The described vehicle space alignment system based on ultrasonic wave, wherein: it is super that described receiver module adopts tl852 chip to constitute Acoustic signals testing circuit, to carry out amplification and the detection of signal;Described ultrasonic signal testing circuit by tl852 chip u2, Resistance r1 ~ r3, electric capacity c1 ~ c3 and c7 ~ c9, inductance l1 and l2, ultrasonic receiver us-rx connect composition;Described tl852 chip U2 includes rec pin, nc pin, gca pin, gcb pin, gcc pin, gcd pin, bias pin, lc pin, g21n draw Pin, giout pin, gadj pin, giin pin, xin pin, vcc pin and gnd pin;Described rec pin is connected with output Terminal sout;Described tl852 chip passes through described vcc pin and connects+5v power supply, is grounded by described gnd pin, by described Gca pin, gcb pin, gcc pin and gcd pin are connected with the gpio port of described main control chip;Described resistance r1 one end is even Connect described bias pin, the other end is grounded;Described resistance r2 one end connects described gadj pin, and the other end connects described giin and draws Pin;Described resistance r3 one end connects described xin pin, and the other end connects described giin pin;Described electric capacity c1 one end ground connection, separately One end is connected to the tie point of described+5v power supply and vcc pin;Described electric capacity c7 one end is connected to described lead-out terminal sout, The other end is grounded;Described electric capacity c8 is connected between described g21n pin and giout pin;Described inductance l1 one end connects described + 5v power supply, the other end connects described lc pin;Described electric capacity c2 is parallel to described inductance l1 two ends;Described inductance l2 one end is even Connect described xin pin, the other end passes through described electric capacity c3 and connects described ultrasonic receiver us-rx one end, and described ultrasonic wave connects Receive the other end ground connection of device us-rx;Described electric capacity c9 is parallel to ultrasonic receiver us-rx two ends.
The described vehicle space alignment system based on ultrasonic wave, wherein: described lead-out terminal sout is connected with tl852 chip Output signal processing circuit, described tl852 chip signal output process circuit by operational amplifier a1 and a2, resistance r4 ~ r6, Electric capacity c10, diode d1 and d2 connect composition;The input in the same direction of described operational amplifier a1 connects described lead-out terminal sout , the reverse input end of described operational amplifier a1 linked together with output end, and the output end of described operational amplifier a1 is also logical Cross the input in the same direction that described resistance r4 is connected to described operational amplifier a2;The positive pole of described operational amplifier a1 connects 3.3v Power supply, minus earth;Described resistance r5 one end connects the reverse input end of described operational amplifier a2, and the other end passes through described electricity Resistance r6 connects 3.3v power supply;Described electric capacity c10 one end ground connection, the other end is connected to described operational amplifier a1 and 3.3v power supply Tie point;The anode tap of described diode d1 is connected to the tie point of described resistance r5 and r6, the cathode terminal of described diode d1 It is connected to the anode tap of described diode d2, the cathode terminal ground connection of described diode d2.
The described vehicle space alignment system based on ultrasonic wave, wherein: described serial ports screen display module uses Di Wen Serial ports screen, described enlightening literary composition serial ports screen is asynchronous, the full duplex serial ports adopting, and serial ports pattern is 8n1, and each data transmits 10 positions I.e. 1 start bit, 8 data bit and 1 stop position.
The described vehicle space alignment system based on ultrasonic wave, wherein: described power supply adopts 50w three-way switch power supply to provide Stablize 5v-3a power supply;Described serial ports screen display module for power supply demand is 5v-800ma;Described switching processing module adopts The three-terminal voltage-stabilizing power supply of ams1117-3.3v voltage stabilizing chip by the 5v voltage conversion of Switching Power Supply for 3.3v be described main control chip Power supply.
Beneficial effect:
It is simple, reasonable that the vehicle space positioning system structure based on ultrasonic wave for the present invention designs, and it mainly utilizes ultrasonic wave Range finding is realized local space and is accurately positioned, display of location information etc., compares the unidirectional range finding of traditional utilization ultrasonic wave or obstacle Thing judges, the system adopts multicast pattern by ultrasonic wave from " dotted line utilization " to " planarization is used " extension, and increasing it should Use scope;During measurement, multipoint reception positioning can avoid the positioning result causing because barrier obstruction leads to a certain road dropout Mistake it is ensured that the stability of system operation, can put to positioning after respective algorithms and carry out error correction, greatly by multimetering data Improve greatly the reliability of final location information;Meanwhile, the system can apply to work by increasing receiving point expansion orientation range The floor truck positioning in factory or laboratory, the route breaking through traditional trajectory Car limits, and dolly scope of activities is extended to full sky Between, greatly improve the utilization ratio of dolly, also can operate with many real lifes simultaneously;Moreover, the system is based on ultrasonic Ripple range finding is realized local space and is accurately positioned, and makes dolly break through traditional restriction to working space for the positioning mode, system passes through one The receiving point received ultrasonic signal of the fixed position of fixed number amount, can be measured with the time difference receiving exactly according to transmitting Distance between known point and tested point, obtains the position of tested point using location algorithm, and positioning precision can reach Centimeter Level.
Brief description
Fig. 1 is the structure principle chart based on the vehicle space alignment system of ultrasonic wave for the present invention;
Fig. 2 is the structure principle chart of the ultrasonic wave transmitter module based on the vehicle space alignment system of ultrasonic wave for the present invention;
Fig. 3 is the ultrasonic signal inspection of the ultrasonic wave receiver module based on the vehicle space alignment system of ultrasonic wave for the present invention Slowdown monitoring circuit figure;
Fig. 4 is the tl852 chip signal output process circuit figure based on the vehicle space alignment system of ultrasonic wave for the present invention.
Specific embodiment
As shown in figure 1, the vehicle space alignment system based on ultrasonic wave for the present invention, including main control chip 1, transmitter module 2, Receiver module 3, switching processing module 4, control input module 5, serial ports screen display module 6 and power supply 7.
This main control chip 1 uses tms320f28027 main control chip, and it connects transmitting mould respectively by gpio port Block 2, switching processing module 4 and control input module 5, meanwhile, connect serial ports screen display module 6 also by serial ports sci;This master control Chip 1 is provided with for producing 40khz square wave and the timer and the power management module that are used for timing, this power supply 7 and master control core The power management module of piece 1 connects, and this receiver module 3 is connected to switching processing module 4 and by processing module 4 and the master control of transferring Chip 1 connects.
This control input module 5 receives the outside control operation to system and that operating result is converted into system is discernible Information, is then delivered in main control chip 1;This main control chip 1 sends control command to transmitter module 2, and transmitter module 2 sends ultrasonic Ripple, ultrasonic wave is propagated in the air, is received by different receiver modules 3 according to distance, when main control chip 1 obtains receiver module Have no progeny in 3 receptions sending, main control chip 1 gives switching processing module 4 control signal, control switching processing module 4 will receive mould The data that block 3 receives is converted into the signal that main control chip 1 can receive and delivers to main control chip 1, and main control chip is according to receiving knot Fruit is calculated corresponding position coordinates, delivers to serial ports screen display module 6 after treatment, and serial ports screen display module 6 is by result Show.
Wherein, this main control chip 1 is mainly communicated with serial ports screen display module 6 by serial ports sci, by serial ports sci Baud rate data form (8n1) and screen be set to consistent get final product proper communication;Serial ports screen display module 6 gives main control chip 1 Sending data is to send main control chip 1 to by the corresponding instruction of touch-control configuration setting, and main control chip 1 passes through serial ports sci's Fifo interrupt mode accepts data that serial ports screen display module 6 sends over and is saved in corresponding array, according to system Needs are judged to arrange accordingly, and it is to send number with the fifo query pattern of serial ports sci to serial ports screen display module 6 According to serial ports screen display module 6 operates all to execute according to corresponding instruction accordingly, so the data sending need to be to instruct Form send.
As shown in Fig. 2 this transmitter module 2 is mainly used in realizing the sending function of ultrasonic pulse signal, its by resistance r1 ~ R3, triode p1, transformer t1, ultrasonic transmitter us-tx, FET n1 and contact pin p(are used for preventing electricity when test Path loss is bad, is short circuit state during normal use) connect composition.Wherein, this resistance r2 one end is connected with cut off end Son, the other end is connected to triode p1(pnp type triode) base stage;Cut off terminal connects the gpio end of main control chip 1 Mouthful, for repercussions suppression;The emitter stage of triode p1 connects 5v power supply, and the colelctor electrode of triode p1 is connected respectively by resistance r1 No. 2 ports of contact pin p and the negative pole end of transformer t1 primary coil, the positive terminal of transformer t1 primary coil connects 5v power supply; Ultrasonic transmitter us-tx is connected between the both positive and negative polarity of transformer t1 secondary coil;The source electrode of FET n1 is connected to slotting No. 1 port of pin p, the grounded drain of FET n1, the grid of FET n1 is connected with send ctrl terminal;send Ctrl terminal is connected with the ultrasonic pulse signal emission port of main control chip 1, is sent out by the ultrasonic pulse signal of main control chip 1 Penetrate the control signal that port input produces 40khz ultrasonic pulse;Resistance r3 one end is grounded, and the other end connects send ctrl end Son.
As shown in figure 3, this receiver module 3 adopts tl852 chip to constitute ultrasonic signal testing circuit, carry out putting of signal Big and detection;Wherein, this ultrasonic signal testing circuit is by tl852 chip u2, resistance r1 ~ r3, electric capacity c1 ~ c3 and c7 ~ c9, electricity Sense l1 and l2, ultrasonic receiver us-rx connect composition.This tl852 chip u2 include rec pin, nc pin, gca pin, Gcb pin, gcc pin, gcd pin, bias pin, lc pin, g21n pin, giout pin, gadj pin, giin pin, Xin pin, vcc pin and gnd pin;Wherein, this pin rec is connected with lead-out terminal sout, and this tl852 chip passes through vcc Pin connect+5v power supply, be grounded by gnd pin, this gca pin, gcb pin, gcc pin and gcd pin all with master control core The gpio port of piece 1 connects, and starts timing as starting point with the timer that main control chip 1 is used for timing, before undone measurement with The increase of time and increase its gain factor (gain factor selects with reference to the gain of different time sections in tl852 chip), with Make up the loss of ultrasonic wave energy in communication process;Resistance r1 one end connects bias pin, and the other end is grounded;Resistance r2 one end Connect gadj pin, the other end connects giin pin;Resistance r3 one end connects xin pin, and the other end also connects giin pin;Electricity Hold c1 one end ground connection, the other end is connected to the tie point of+5v power supply and vcc pin;Electric capacity c7 one end is connected to lead-out terminal Sout, the other end is grounded;Electric capacity c8 is connected between g21n pin and giout pin;Inductance l1 one end connects+5v power supply, separately One end connects lc pin;Electric capacity c2 is parallel to inductance l1 two ends;Inductance l2 one end connects xin pin, and the other end passes through electric capacity c3 Connect ultrasonic receiver us-rx one end, the other end ground connection of ultrasonic receiver us-rx;Electric capacity c9 is parallel to ultrasonic wave and connects Receive device us-rx two ends, wherein, this electric capacity c3 and c9 is used for receiving loop resonance, need to receive by the ultrasonic wave that measurement uses Device us-rx capacitance and corresponding inductance l2, transformer secondary output inductance determine.
Wherein, this lead-out terminal sout is connected with tl852 chip signal output process circuit, as shown in figure 4, this tl852 Chip signal output process circuit is by operational amplifier a1 and a2, resistance r4 ~ r6, electric capacity c10, diode d1 and d2 connection group Become.The input in the same direction of this operational amplifier a1 connects lead-out terminal sout, and reverse input end is linked together with output end, Output end is connected to the input in the same direction of operational amplifier a2 also by resistance r4, and meanwhile, the positive pole of operational amplifier a1 connects 3.3v power supply, minus earth;The reverse input end of resistance r5 one end concatenation operation amplifier a2, the other end is connected by resistance r6 3.3v power supply;Electric capacity c10 one end is grounded, and the other end is connected to the tie point of 3.3v power supply and operational amplifier a1;Diode d1 Anode tap be connected to the tie point of resistance r5 and r6, the cathode terminal of diode d1 is connected to the anode tap of diode d2, two poles The cathode terminal ground connection of pipe d2.
Switching processing module 4 carries out integration with other modules and is connected, and reduces fly line situation when circuit connects, reduces line Error, increases stability and the security of system.
Serial ports screen display module 6 use enlightening literary composition serial ports screen (7.0 cun, 800*480 graphic dot matrix k600+ kernel 65k Color dgus screen), this enlightening literary composition serial ports screen is asynchronous, the full duplex serial ports (uart) adopting, and serial ports pattern is 8n1, i.e. each data 10 positions of transmission: 1 start bit, 8 data bit (status is in front transmission, lsb), 1 stop position.
Power supply 7 provides power supply to whole system, and it is steady that it adopts 50w three-way switch power supply (5v3a-12v1a-24v1a) to provide Determine 5v-3a power supply, wherein, serial ports screen display module 6 power demands 5v-800ma, larger to current requirements;Switching processing module 4 Using ams1117-3.3v voltage stabilizing chip three-terminal voltage-stabilizing power supply by the 5v voltage conversion of Switching Power Supply for 3.3v be main control chip 1 Power supply.
Present configuration design is simple, reasonable, stable, positioning can be put and just carry out error bridge, can effectively improve The reliability of whole location information, realizes being accurately positioned of vehicle space.

Claims (6)

1. a kind of vehicle space alignment system based on ultrasonic wave it is characterised in that: described vehicle space alignment system include lead Control chip, transmitter module, receiver module, switching processing module, control input module, serial ports screen display module and power supply;Described Main control chip connects described transmitter module, switching processing module and control input module respectively by gpio port, simultaneously also logical Cross serial ports sci and described serial ports screen display module connection communication;Described main control chip is provided with power management module, and it passes through described Power management module connects described power supply;Described receiver module is connected to described switching processing module and is processed by described switching Module is connected with described main control chip;
Described control input module receives the outside control operation to system and operating result is converted into the discernible letter of system Breath delivers to described main control chip;Described transmitter module receives the control command of described main control chip transmission and sends ultrasonic wave, institute State receiver module and receive the ultrasonic wave that described transmitter module sends;When connecing that described main control chip obtains that described receiver module sends Have no progeny in receipts, described main control chip is given described switching processing module control signal and controls described switching processing module to connect described Receive the data that module receives and be converted into the signal that described main control chip can receive and deliver to described main control chip, described main control chip It is calculated corresponding position coordinates and delivers to described serial ports screen display module, described serial ports after treatment according to receiving result Result is shown by screen display module;
Described main control chip is to be set to the baud rate data form of described serial ports sci and described serial ports screen display module Unanimously, to realize proper communication;Described serial ports screen display module is to be instructed accordingly to described master control by touch-control configuration setting Chip sends data;
Described main control chip uses tms320f28027 chip and is additionally provided with for producing 40khz square wave and being used for timing Timer, the data that it is sended over by the fifo interrupt mode described serial ports screen display module of acceptance of described serial ports sci is simultaneously It is saved in corresponding array, meanwhile, described main control chip gives described serial ports screen display with the fifo query pattern of described serial ports sci Show that module sends data;
Described transmitter module by resistance r1 ~ r3, triode p1, transformer t1, ultrasonic transmitter us-tx, FET n1 and Contact pin p connects composition;
Described resistance r2 one end is connected with cut off terminal, and the other end is connected to the base stage of described triode p1;Described cut Off terminal is connected to the gpio port of described main control chip, for repercussions suppression;The emitter stage of described triode p1 connects 5v electricity Source, the colelctor electrode of described triode p1 connects No. 2 ports of described contact pin p and described transformer t1 respectively by described resistance r1 The negative pole end of primary coil, the positive terminal of described transformer t1 primary coil connects 5v power supply;Described ultrasonic transmitter us-tx It is connected between the both positive and negative polarity of described transformer t1 secondary coil;The source electrode of described FET n1 is connected to the 1 of described contact pin p Number port, grounded drain, grid is connected with send ctrl terminal;Described send ctrl terminal is ultrasonic with described main control chip Wave pulse signal emission port connects, and produces 40khz by the ultrasonic pulse signal emission port input of described main control chip The control signal of ultrasonic pulse;Described resistance r3 one end ground connection, the other end connects described send ctrl terminal.
2. the vehicle space alignment system based on ultrasonic wave as claimed in claim 1 it is characterised in that: described contact pin p is just It is in short circuit state during often using;Described triode p1 uses pnp triode.
3. the vehicle space alignment system based on ultrasonic wave as claimed in claim 1 it is characterised in that: described receiver module is adopted Constitute ultrasonic signal testing circuit with tl852 chip, to carry out amplification and the detection of signal;Described ultrasonic signal detection electricity Route tl852 chip u2, resistance r1 ~ r3, electric capacity c1 ~ c3 and c7 ~ c9, inductance l1 and l2, ultrasonic receiver us-rx connection group Become;
Described tl852 chip u2 includes rec pin, nc pin, gca pin, gcb pin, gcc pin, gcd pin, bias draw Pin, lc pin, g21n pin, giout pin, gadj pin, giin pin, xin pin, vcc pin and gnd pin;Described Rec pin is connected with lead-out terminal sout;Described tl852 chip passes through described vcc pin and connects+5v power supply, by described gnd Pin is grounded, and is connected by the gpio port of described gca pin, gcb pin, gcc pin and gcd pin and described main control chip Connect;Described resistance r1 one end connects described bias pin, and the other end is grounded;Described resistance r2 one end connects described gadj pin, The other end connects described giin pin;Described resistance r3 one end connects described xin pin, and the other end connects described giin pin; Described electric capacity c1 one end ground connection, the other end is connected to the tie point of described+5v power supply and vcc pin;Described electric capacity c7 one end is even It is connected to described lead-out terminal sout, the other end is grounded;Described electric capacity c8 is connected between described g21n pin and giout pin; Described inductance l1 one end connects described+5v power supply, and the other end connects described lc pin;Described electric capacity c2 is parallel to described inductance l1 Two ends;Described inductance l2 one end connects described xin pin, and the other end passes through described electric capacity c3 and connects described ultrasonic receiver Us-rx one end, the other end ground connection of described ultrasonic receiver us-rx;Described electric capacity c9 is parallel to ultrasonic receiver us-rx Two ends.
4. the vehicle space alignment system based on ultrasonic wave as claimed in claim 3 it is characterised in that: described lead-out terminal Sout is connected with tl852 chip signal output process circuit, and described tl852 chip signal output process circuit is by operation amplifier Device a1 and a2, resistance r4 ~ r6, electric capacity c10, diode d1 and d2 connect composition;
The input in the same direction of described operational amplifier a1 connects described lead-out terminal sout, and described operational amplifier a1's is reverse Input is linked together with output end, and the output end of described operational amplifier a1 is connected to described fortune also by described resistance r4 Calculate the input in the same direction of amplifier a2;The positive pole of described operational amplifier a1 connects 3.3v power supply, minus earth;Described resistance r5 One end connects the reverse input end of described operational amplifier a2, and the other end passes through described resistance r6 and connects 3.3v power supply;Described electricity Hold c10 one end ground connection, the other end is connected to the tie point of described operational amplifier a1 and 3.3v power supply;The sun of described diode d1 Extremely it is connected to the tie point of described resistance r5 and r6, the cathode terminal of described diode d1 is connected to the anode of described diode d2 End, the cathode terminal ground connection of described diode d2.
5. the vehicle space alignment system based on ultrasonic wave as claimed in claim 1 it is characterised in that: described serial ports screen shows Module uses enlightening literary composition serial ports screen, and described enlightening literary composition serial ports screen is asynchronous, the full duplex serial ports adopting, and serial ports pattern is 8n1, often It is 1 start bit that individual data transmits 10 positions, 8 data bit and 1 stop position.
6. the vehicle space alignment system based on ultrasonic wave as claimed in claim 1 it is characterised in that: described power supply adopts 50w three-way switch power supply provides stablizes 5v-3a power supply;
Described serial ports screen display module for power supply demand is 5v-800ma;
Described switching processing module adopts the three-terminal voltage-stabilizing power supply of ams1117-3.3v voltage stabilizing chip by the 5v voltage of Switching Power Supply Be converted to 3.3v to power for described main control chip.
CN201410297970.2A 2014-06-29 2014-06-29 Vehicle space locating system based on ultrasonic waves Expired - Fee Related CN104076347B (en)

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