CN104569986A - Concealed encoding ultrasonic reverse radar - Google Patents
Concealed encoding ultrasonic reverse radar Download PDFInfo
- Publication number
- CN104569986A CN104569986A CN201410841149.2A CN201410841149A CN104569986A CN 104569986 A CN104569986 A CN 104569986A CN 201410841149 A CN201410841149 A CN 201410841149A CN 104569986 A CN104569986 A CN 104569986A
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- Prior art keywords
- ultrasonic
- signal
- ultrasonic probe
- probe
- radar
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO 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
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
- G01S15/06—Systems determining the position data of a target
- G01S15/08—Systems for measuring distance only
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO 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
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/88—Sonar systems specially adapted for specific applications
- G01S15/93—Sonar systems specially adapted for specific applications for anti-collision purposes
- G01S15/931—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO 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
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/88—Sonar systems specially adapted for specific applications
- G01S15/93—Sonar systems specially adapted for specific applications for anti-collision purposes
- G01S15/931—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles
- G01S2015/937—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles sensor installation details
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
The invention belongs to the technical field of vehicle equipment, and particularly relates to a concealed encoding ultrasonic reverse radar. The radar comprises a control circuit, ultrasonic probes, medium glue and fixing bayonets, wherein the ultrasonic probes are pasted and fixed on the inner side of an automobile bumper envelope via the coupling medium glue; an ultrasonic signal penetrates through the bumper envelope to be transmitted to spread in air; and the control circuit controls transmission of the encoding ultrasonic signal and processes a received reflected signal, so that a barrier is detected and a distance between a vehicle and the barrier is computed. The probes are pasted and fixed on the inner side of the bumper envelope, and a hole is not required to be formed in the envelope, so that true concealed mounting is achieved, the attractiveness and the solidity of a vehicle body are improved, and the assembly flow and complexity of the reverse radar of the vehicle are reduced.
Description
Technical field
The invention belongs to vehicle arrangement technical field, be specifically related to the ultrasonic radar for backing car of a kind of concealed coding.
Background technology
Ultrasonic radar for backing car has been widely used in the backing system of various vehicle.Usually the ultrasonic radar for backing car adopted at present, distinguish according to mounting means, have two kinds:
One is perforate on vehicle bumper covering, is positioned over by ultrasonic probe within perforate, and detecting head surface and Abdeckung Stossfaenger in one plane, leave certain interval between ultrasonic probe and perforate.The vibration surface of probe directly contacts with air.The control circuit of radar for backing car is positioned over inside Abdeckung Stossfaenger, and this control circui ultrasonic probe is launched ultrasound wave and also processed the reflected ultrasonic received, thus the distance of disturbance in judgement thing.Due to the existence of perforate, this method reduces the aesthetic property of vehicle body, and have certain influence to the soundness of bumper.In addition, owing to needing perforate in installation process, add flow process and the complexity of assembling, add assembly cost.At present, what most vehicle with ultrasonic radar for backing car adopted in the world is all this radar for backing car.
Another kind is the ultrasonic probe using Thickness Ratio thinner, ultrasonic probe is arranged on the outside of vehicle bumper covering, the side do not transmitted by ultrasonic probe by viscose glue is bonded on covering, but needs out aperture or accessed in car by the signal wire of probe by car door gap.Control circuit and the first method of radar for backing car are similar, are positioned over equally inside Abdeckung Stossfaenger.This method is owing to being arranged on outside car by probe, and have a strong impact on the aesthetic property of vehicle body, ultrasonic probe also easily damages.When the method is generally used for vehicle release, ultrasonic radar for backing car is not installed, the occasion that car owner's later stage is bought voluntarily and installs, uses fewer.
Above two kinds of methods, the vibration surface of probe is all directly contact with air, the propagation of ultrasonic signal only by this interface between probe and air, therefore signal multipath reflection, decay smaller, design on control circuit is comparatively simple.Although have certain influence to vehicle body aesthetic property, because technology is simple, use very extensive at present.
Summary of the invention
The object of the invention is the defect being to overcome above-mentioned prior art, a kind of ultrasonic radar for backing car of the coding that can penetrate Abdeckung Stossfaenger is completely newly provided, ultrasonic probe and control circuit is made all to be arranged on inside Abdeckung Stossfaenger, install without the need to perforate, thus realize the hiding installation of radar for backing car, promote the aesthetics of vehicle body and the solidness of bumper, simplify flow process and the complexity of assembling simultaneously.
For achieving the above object, present invention employs following technical scheme:
The ultrasonic radar for backing car of concealed coding, system comprises: control circuit, ultrasonic probe, medium glue, fixing bayonet socket.Adopt multiple (not terminating in one) ultrasonic probe in system, to obtain enough coverages, 4 ultrasonic probes are adopted usually for vehicle rear bumper.
Ultrasonic probe inside Abdeckung Stossfaenger, assists fixation by fixing bayonet socket by medium glue.The ultrasound wave that ultrasonic probe sends penetrates Abdeckung Stossfaenger and outwards propagates.Medium glue plays two effects here: one is coupling; fill the slight void between probe and Abdeckung Stossfaenger; acted on by " the coupling transition " of medium glue, the acoustic impedance difference between probe and Abdeckung Stossfaenger is reduced, thus reduce the reflection loss of ultrasonic energy at this interface; Two is paste fixation, adopts medium glue to be pasted onto on Abdeckung Stossfaenger by ultrasonic probe.
Described control circuit comprises processor MCU, signal conditioning circuit, probe driving circuit, the signal that ultrasonic probe receives is sent into signal conditioning circuit and is carried out amplification and filtering process, the simulating signal that processor MCU is exported by high-speed A/D converter collection signal modulate circuit, is converted into digital signal and processes; Processor (MCU) sends pulse electrical signal through coding to driving circuit of popping one's head in, and probe driving circuit provides enough large output voltage and output current, thus drives ultrasonic probe pulse electrical signal to be converted to enough strong pulse ultrasonic wave and to send; Coding ultrasound wave is coupled to Abdeckung Stossfaenger by medium glue, then through Abdeckung Stossfaenger, is transmitted to outside vehicle region to be detected.
In the present invention, ultrasound wave runs into barrier in communication process in atmosphere and is reflected, the interface of ultrasonic echo successively between air and Abdeckung Stossfaenger of reflection, the interface between Abdeckung Stossfaenger and medium glue, the interface between medium glue and ultrasonic probe, finally received by ultrasonic probe, be converted to electric signal.Due to ultrasound wave in communication process through the reflection at multiple interface and attenuation, the signal to noise ratio (S/N ratio) of reflected signal that ultrasonic probe receives is very low.Signal conditioning circuit amplifies and filtering this tiny signal, thus echoed signal is more easily further processed.
In the present invention, the signal that processor (MCU) is exported by AD converter sampled signal modulate circuit, adopt digital signal processing and algorithm for pattern recognition to carry out the process such as decoding to this signal, therefrom identify pulse code thus find the position of pulse echo, calculating hyperacoustic travel-time.According to hyperacoustic travel-time and hyperacoustic velocity of sound, calculate the distance of barrier, and make instruction of reporting to the police accordingly.Adopt the effect of coded pulse to be the signal to noise ratio (S/N ratio) improving Received signal strength, pulse echo is more easily identified.
The invention provides a kind of ultrasound wave coded excitation and the detection technique that can penetrate Abdeckung Stossfaenger, ultrasonic probe and control circuit are all arranged on inside Abdeckung Stossfaenger, and install without the need to perforate, thus achieve the hiding installation of radar for backing car, improve the aesthetics of vehicle body and the solidness of bumper.Also reduce assemble flow and the complexity of vehicle backing radar simultaneously.
Accompanying drawing explanation
Fig. 1 is ultrasonic reverse radar system structural drawing of the present invention.
Number in the figure: 1. control circuit, 2. ultrasonic probe, 3. medium glue, 4. fixing bayonet socket, 5. Abdeckung Stossfaenger, 6. barrier, 7. ultrasound wave.1-1.MCU, 1-2. signal conditioning circuit, 1-3. pops one's head in driving circuit.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
As shown in Figure 1, the ultrasonic reverse radar system of concealed coding of the present invention comprises: control circuit 1, ultrasonic probe 2, medium glue 3, fixing bayonet socket 4.Wherein, a ultrasonic probe is at least comprised.The emission angle of general ultrasonic probe is not more than 90 degree, so the coverage of single ultrasonic probe is very limited, and probe can increase the cost of system too much.Adopt 4 ultrasonic probes in the present embodiment, there is enough coverages.
In the present embodiment, ultrasonic probe 2 is pasted and fixed on inside Abdeckung Stossfaenger 5 by medium glue 3.Specifically can adopt silicon viscose ultrasound wave to high conductance, this glue matches with the acoustic impedance of probe and covering.Make it to melt with the heating of common heating glue rifle, it squeezed at ultrasonic probe 2 outside surface in appropriate amount, be then attached to by ultrasonic probe 2 in the fixing bayonet socket 4 inside Abdeckung Stossfaenger 5, probe can block to help to fix by fixing bayonet socket 4.Wait for that a few minutes make medium glue 3 naturally cool and namely complete installation.Medium glue 3 is filled with the slight void between probe and Abdeckung Stossfaenger 5 surface of contact, thus reduces the impact of interstitial micro-air on ultrasonic penetration.On the other hand, acted on by " transition " of medium glue 3, the acoustic impedance difference between probe 2 and Abdeckung Stossfaenger 5 is reduced, thus reduce the reflection loss of ultrasonic energy at this interface.
In the present embodiment, processor MCU 1-1 adopts 16 single-chip microcomputers, has the instruction execution capability of 64MIPS, the AD converter of the RAM of Flash and 64KB of 256KB, 10Msps speed.Processor MCU 1-1 sends the pulse electrical signal extremely probe driving circuit 1-3 through coding, and this circuit adopts large power triode amplifying circuit to provide enough driving forces.Ultrasonic probe 2 adopts centre frequency at the monocrystalline compressional wave normal probe of about 400kHz.The interface of ultrasound wave 7 successively between ultrasonic probe 2 and medium glue 3 sent, the interface between medium glue 3 and Abdeckung Stossfaenger 5, the interface between Abdeckung Stossfaenger 5 and extraneous air, the air relaying arriving outside vehicle resumes to be broadcast.
Above-mentioned ultrasound wave 7 runs into barrier 6 in communication process, produces reflection echo.Reflection echo through the interface air and Abdeckung Stossfaenger 5, the interface between Abdeckung Stossfaenger 5 and medium glue 3, the interface between medium glue 3 and ultrasonic probe 2, is finally received by ultrasonic probe 2 and is converted to electric signal successively.Signal conditioning circuit 1-2 adopts has high-gain, the amplifying circuit of high cmrr and filtering circuit.Through signal condition, small-signal is exaggerated, and out-of-band noise to a certain degree by filtering, thus is convenient to MCU1-1 and is done further subsequent treatment.
Processor MCU 1-1 utilizes the output of the high-speed A/D converter in its sheet to signal conditioning circuit 1-2 to sample, and this simulating signal is converted to digital signal.Program in processor MCU 1-1 adopts digital signal processing and algorithm for pattern recognition to carry out decoding to this signal and processes, and therefrom identifies pulse code thus finds the position of head pulse, to calculate hyperacoustic travel-time.According to travel-time and hyperacoustic velocity of sound, calculate the distance of barrier 6, and make according to distance instruction of reporting to the police accordingly.
Processor MCU 1-1, in the different time periods, controls ultrasound-driven circuit 1-3 respectively and drives corresponding ultrasonic probe 2 to send pulsed ultrasonic wave, and the ultrasound echo signal of this road ultrasonic probe of then sampling is gone forward side by side row relax.In the present embodiment, every road ultrasonic probe transmitting time is 1 millisecond, sends and is spaced apart 5 milliseconds.Because adopt 4 road ultrasonic probes, so the time once detected is 20 milliseconds, look-in frequency is 50 times per second.
Claims (3)
1. the ultrasonic radar for backing car of concealed coding, is characterized in that comprising: control circuit (1), ultrasonic probe (2), medium glue (3), fixing bayonet socket (4); Wherein, described control circuit (1) comprises processor MCU (1-1), signal conditioning circuit (1-2), ultrasound-driven circuit (1-3), described ultrasonic probe (2) has multiple, the vibration surface of ultrasonic probe (2) is pasted and fixed on Abdeckung Stossfaenger (5) inner side by medium glue (3), and by the auxiliary fixation of popping one's head in of fixing bayonet socket (4); The signal that ultrasonic probe (2) receives is sent into signal conditioning circuit (1-2) and is carried out amplification and filtering process, the simulating signal that processor MCU (1-1) is exported by high-speed A/D converter collection signal modulate circuit (1-2), is converted into digital signal and processes; Processor (MCU) transmission passes through the pulse electrical signal of coding to driving circuit of popping one's head in, and probe driving circuit provides enough large output voltage and output current, drives ultrasonic probe pulse electrical signal to be converted to enough strong pulse ultrasonic wave and sends; Coding ultrasound wave is coupled to Abdeckung Stossfaenger by medium glue, then through Abdeckung Stossfaenger, is transmitted to outside vehicle region to be detected.
2. the ultrasonic radar for backing car of concealed coding according to claim 1, it is characterized in that, ultrasound wave (7) runs into barrier (6) in communication process in atmosphere and is reflected, the interface of ultrasonic echo successively between air and Abdeckung Stossfaenger (5) of reflection, the interface between Abdeckung Stossfaenger (5) and medium glue (3), the interface between medium glue (3) and ultrasonic probe (2), finally received by ultrasonic probe (2), be converted to electric signal.
3. the ultrasonic radar for backing car of concealed coding according to claim 1, it is characterized in that, processor MCU (1-1) adopts the pulse signal through coding to control ultrasonic probe transmitting ultrasound wave, adopt digital signal processing and algorithm for pattern recognition, from echoed signal, identify pulse code thus find the position of head pulse, to calculate hyperacoustic travel-time, calculate the distance of barrier according to travel-time and hyperacoustic velocity of sound.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410841149.2A CN104569986A (en) | 2014-12-30 | 2014-12-30 | Concealed encoding ultrasonic reverse radar |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410841149.2A CN104569986A (en) | 2014-12-30 | 2014-12-30 | Concealed encoding ultrasonic reverse radar |
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| CN104569986A true CN104569986A (en) | 2015-04-29 |
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| CN201410841149.2A Pending CN104569986A (en) | 2014-12-30 | 2014-12-30 | Concealed encoding ultrasonic reverse radar |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109661590A (en) * | 2016-09-20 | 2019-04-19 | 苹果公司 | Retroreflector |
| CN113687362A (en) * | 2021-10-27 | 2021-11-23 | 广东奥迪威传感科技股份有限公司 | Anti-signal interference distance detection method and device |
| WO2022033298A1 (en) * | 2020-08-11 | 2022-02-17 | 华为技术有限公司 | Detection apparatus, manufacturing method for detection apparatus, and terminal comprising detection apparatus |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109661590A (en) * | 2016-09-20 | 2019-04-19 | 苹果公司 | Retroreflector |
| WO2022033298A1 (en) * | 2020-08-11 | 2022-02-17 | 华为技术有限公司 | Detection apparatus, manufacturing method for detection apparatus, and terminal comprising detection apparatus |
| CN113687362A (en) * | 2021-10-27 | 2021-11-23 | 广东奥迪威传感科技股份有限公司 | Anti-signal interference distance detection method and device |
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Application publication date: 20150429 |