CN104880704A - Automotive distance measuring system - Google Patents
Automotive distance measuring system Download PDFInfo
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- CN104880704A CN104880704A CN201510148018.0A CN201510148018A CN104880704A CN 104880704 A CN104880704 A CN 104880704A CN 201510148018 A CN201510148018 A CN 201510148018A CN 104880704 A CN104880704 A CN 104880704A
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- China
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- module
- latitude
- longitude information
- information parameter
- car
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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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/08—Systems for measuring distance only
Abstract
The invention discloses an automotive distance measuring system, which includes a data processing module; and a satellite navigation module, a radio frequency transceiver module, a display module and a power supply module which are connected with the data processing module. According to the invention, the satellite navigation module is used for receiving and inputting latitude and longitude information to a single-chip microcomputer, the radio frequency transceiver module is controlled to transmit the latitude and longitude information via a channel 1 of an nRF2401 module and receive the latitude and longitude information of the surrounding via a channel 2, the received latitude and longitude information of the surrounding vehicles is inputted to the single-chip microcomputer to be processed, and thus the precise automotive distance is obtained.
Description
Technical field
The present invention relates to a kind of range measurement system, particularly relate to a kind of automobile distance measuring system, belong to range finding field.
Background technology
Automobile is that outstanding contribution has been made in the development of human society, but also brings startling injury.In recent years, along with the development of highway, automobile driving speed improves, and pernicious traffic hazard takes place frequently.In the fatal accident that traffic accident causes, knock into the back and account for 25%.Therefore, research can obtain road and information of vehicles at any time, and reminds driver to take measures to avoid dangerous spacing monitor and early warning system just to become the important means solving highway traffic safety problem in time.
Along with expanding economy, transportation is become increasingly prosperous, but is difficult to catch up with due to the hardware such as road condition, traffic administration, add drive overtake other vehicles, principle that to go out that car is deserted, mistake estimates spacing etc. subjective, the traffic hazard of collision is mutually occurred again and again.The essential measure addressed this problem is to install and can find range from motion tracking to the automobile in advancing, self-stopping device in risk distance.
Due to the development of electronic technology, laser ranging, microwave radar range, ultrasonic ranging and infrared distance measuring are successively there is.Wherein laser ranging is detecting laser beam two spacing reflected by the catoptron of laser beam irradiation on front truck (automobile tail).Due to the vibration by atrocious weather, automobile fierceness, the factors such as mirror surface is worn and torn, pollution impact, make the laser beam of reflection detection range on certain power reduce 1/2 ~ 1/3 than the ultimate range that may detect, loss is very large, the degree of accuracy of impact detection; Microwave radar range technology be military and the circuit part such as the equipment that adopts of some commercial development and oscillator expensive, almost also do not open up now commercial market; Research was done in ultrasonic ranging at home and abroad existing people, owing to adopting special professional component to make its price high, was difficult to promote; Infrared ray, as a kind of special light wave, has the basic physical transfer characteristic-reflection, refraction, scattering etc. of light wave, and due to its technical difficulty relatively not too large, the range measurement system of formation is with low cost, function admirable, is convenient to civilian popularization.
RFID technique appears in World War II the earliest, is successfully applied to the identification of friend or foe of aircraft at that time.Develop into one of 21 century most important technology now.Its ultimate principle utilizes the Space Coupling (inductance or electromagnetic coupled) of radiofrequency signal or the transport property of reflection, realizes the automatic identification to being identified object.
Satellite Navigation Technique is applied to the Global Positioning System (GPS) (GPS) of 20 century 70s by land, sea, and air of U.S. joint research and development the earliest, now global civilian.Because the position of satellite is accurately known, in GPS observation, we can obtain the distance of satellite to receiver, range formula in applying three-dimensional coordinate, utilizes 3 satellites, just can form 3 equations, solve the position (X, Y, Z) of observation station, realize the determination to object's position
Such as application number is a kind of two-way infrared stadimeter of " 201410118986.2 ", relate to infrared distance measurement device, the present invention measures the problem of testing distance in order to solve the existing infrared range-measurement system optional position be difficult in large space, this invention comprises LCDs, first infrared receiving module, first infrared transmission module, second infrared receiving module, second infrared transmission module, processor, A/D modular converter, power module and shell body, the upper surface of shell body has penetrating window, LCDs is arranged in described window, a sidewall of shell body has a hole and No. two holes, a corresponding hole has No. three coaxial holes, corresponding No. two holes have No. four coaxial holes, first infrared signal output terminal is placed in a hole, first received IR signal input end is placed in No. two holes, second infrared signal output terminal is placed in No. three holes, second received IR signal input end is placed in No. four holes.
And for example application number is a kind of infrared distance measuring device of " 201410206194.0 ", it comprises an infrared ambulator and a base, described base is provided with a depressed part, described infrared ambulator is embedded at described depressed part, described infrared ambulator and described base are bolted, the side of described base is connected with one end of side plate by a secure component, the affixed magnet of the other end of described side plate, described magnet is provided with a switch, during described switch opens, described magnet has magnetic, and when described switch closes, described magnet does not have magnetic.This invention infrared distance measuring device is used for measuring the depth of parallelism and the right alignment of pylon or tower cylinder two end flanges, have precision high, measure advantage easily, also improve production efficiency.
Summary of the invention
Technical matters to be solved by this invention provides for the deficiency of background technology the automobile distance measuring system that a kind of cost is low, structure is simple, precision is high, and it accurately can obtain the spacing of vehicle.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A kind of automobile distance measuring system, comprises data processing module and connected satellite navigation module, radio-frequency (RF) receiving and transmission module, display module and power module;
Satellite navigation module, for the latitude and longitude information parameter of this car of Real-time Obtaining;
Radio-frequency (RF) receiving and transmission module, for outwards launching the latitude and longitude information parameter of this car in real time, receives the latitude and longitude information parameter that surrounding vehicles is launched simultaneously;
Data processing module, carries out dynamic process for the latitude and longitude information parameter of launching latitude and longitude information parameter and the surrounding vehicles of this car, and then calculates the distance between two cars, be specifically calculated as:
wherein E
1for the longitude information parameter of this car, E
2for the longitude information parameter of surrounding vehicles, W
1for the latitude information parameter of this car, W
2for the latitude information parameter of surrounding vehicles, S is the distance of Ben Che and surrounding vehicles, and a is the length of longitude and latitude 1 ° representative;
Display module, for showing the distance parameter of this car and surrounding vehicles in real time;
Power module, for providing electric energy needed for satellite navigation module, radio-frequency (RF) receiving and transmission module and display module.
As the further preferred version of a kind of automobile distance of the present invention measuring system, described data processing module adopts AVR series monolithic.
As the further preferred version of a kind of automobile distance of the present invention measuring system, the chip model of described radio-frequency (RF) receiving and transmission module is nRF2401.
As the further preferred version of a kind of automobile distance of the present invention measuring system, described satellite navigation module adopts Beijing Orient couple stars to produce satellite navigation chip Otrack-32.
As the further preferred version of a kind of automobile distance of the present invention measuring system, described display module adopts 12864 dot matrix type LCD display.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
1, cost of the present invention is low, structure is simple, precision is high;
2, the present invention is by the longitude and latitude of real-time measuring vehicle, and then draws the distance of Ben Che and surrounding vehicles, and then better reminds driver to note maintaining safe distance.
Accompanying drawing explanation
Fig. 1 is structure principle chart of the present invention.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
As shown in Figure 1, a kind of automobile distance measuring system, comprises data processing module and connected satellite navigation module, radio-frequency (RF) receiving and transmission module, display module and power module;
Satellite navigation module, for the latitude and longitude information parameter of this car of Real-time Obtaining;
Radio-frequency (RF) receiving and transmission module, for outwards launching the latitude and longitude information parameter of this car in real time, receives the latitude and longitude information parameter that surrounding vehicles is launched simultaneously;
Data processing module, carries out dynamic process for the latitude and longitude information parameter of launching latitude and longitude information parameter and the surrounding vehicles of this car, and then calculates the distance between two cars, be specifically calculated as:
wherein E
1for the longitude information parameter of this car, E
2for the longitude information parameter of surrounding vehicles, W
1for the latitude information parameter of this car, W
2for the latitude information parameter of surrounding vehicles, S is the distance of Ben Che and surrounding vehicles, and a is the length of longitude and latitude 1 ° representative, is specially 1.11 × 105m;
Display module, for showing the distance parameter of this car and surrounding vehicles in real time;
Power module, for providing electric energy needed for satellite navigation module, radio-frequency (RF) receiving and transmission module and display module.
Wherein, described data processing module adopts AVR series monolithic, the chip model of described radio-frequency (RF) receiving and transmission module is nRF2401, and described satellite navigation module adopts Beijing Orient couple stars to produce satellite navigation chip Otrack-32, and described display module adopts 12864 dot matrix type LCD display.
Radio-frequency (RF) receiving and transmission module: nRF2401 chip is a kind of monolithic radio transceiver chip working in 2.4GHz, can realize a circuit-switched data simultaneously and launch and two paths of data receiving function.Radio frequency, 8051MCU, 9 Channel 12-Bit ADC, peripheral cell, inductance and wave filter are all integrated in single-chip by it, and power consumption is very low, and output power and communication channel are configured by program, and range of application widely.What the design adopted is core with nRF2401 chip, and nRF2401 module has two group interfaces, adopts interface 1 to send data respectively; Interface 2 receives data, thus realizes the transmitted in both directions of information.
Satellite navigation module: satellite navigation module needed for native system adopts Beijing Orient couple stars to produce satellite navigation chip Otrack-32, can receive No. two, the Big Dipper, GPS, GLONASS satellite-signal simultaneously, realize multisystem combined navigator fix, test the speed, regularly.Otrack-32 chip achieves 1s warm start the most fast in the world today, international the shortest 35s cold start-up, stable 1s reacquisition; True value location up to 20 times per second; Positioning precision 5m; Differential positioning precision 0.5m; Highly reliable, anti-interference; Adapt to rugged surroundings; Have passed strict ground test and variety carrier dynamic test.Otrack-32 chip is that the professional navigation field such as navigation, measurement, time service provide the high-performance core device domesticized completely.
12864 LCD MODULE: native system adopts 12864 dot matrix type LCD display module, can show the relevant informations such as surrounding vehicles, minimum spacing, this car longitude and latitude.Dot matrix type LCD display module can not only show conventional characters, also can display graphics and Chinese character.12864LCD display module is display 128 points laterally, and longitudinally display 64 points, can show at most 16 × 16 Chinese character 4 row 8 simultaneously and arrange, can meet a large amount of information display requirements.
AVR single chip has prefetched instruction function, namely when an execution instruction, in advance next instruction is got into, and call instruction can be performed within a clock period; Multiple accumulator type, data processing speed is fast; AVR single chip has 32 general purpose working registers, and being equivalent to has 32 viaducts, can fast passing; Response time is fast.AVR single chip has multiple fixing interrupt vector entry address, can respond interruption fast; AVR single chip power consumption is low.For typical power consumption situation, be 100nA when WDT closes, be more suitable for battery powered application apparatus; The minimum 1.8V of some devices gets final product work; AVR single chip security performance is good.
During system works, first obtained the accurate latitude and longitude information of this car by satellite navigation chip, then information is encoded.Coded message mainly comprises this car identification sequence number, latitude and longitude information.After completing information coding, coded message is carried out information transmission by the passage 1 of radio-frequency (RF) receiving and transmission module, and receiver address should be set to unified public address, and the design is defined as 5 hexadecimal address: 0xAAAAA.Adopt passage 2 to receive the information of surrounding vehicles transmission simultaneously, send to single-chip microcomputer to process the information received.
During system works, first System self-test and Initialize installation is carried out, then receive latitude and longitude information by satellite navigation module and be input to single-chip microcomputer, single-chip microcomputer is by controlling radio-frequency (RF) receiving and transmission module, the passage 1 of nRF2401 module is adopted to send latitude and longitude information, adopt passage 2 to receive latitude and longitude information around simultaneously, and the latitude and longitude information of the surrounding vehicles received is input to single-chip microcomputer and carries out processing and then accurately drawing automobile distance.
Those skilled in the art of the present technique are understandable that, unless otherwise defined, all terms used herein (comprising technical term and scientific terminology) have the meaning identical with the general understanding of the those of ordinary skill in field belonging to the present invention.Should also be understood that those terms defined in such as general dictionary should be understood to have the meaning consistent with the meaning in the context of prior art, unless and define as here, can not explain by idealized or too formal implication.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.By reference to the accompanying drawings embodiments of the present invention are explained in detail above, but the present invention is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, makes a variety of changes under can also or else departing from the prerequisite of present inventive concept.
Claims (5)
1. an automobile distance measuring system, is characterized in that: comprise data processing module and connected satellite navigation module, radio-frequency (RF) receiving and transmission module, display module and power module;
Satellite navigation module, for the latitude and longitude information parameter of this car of Real-time Obtaining;
Radio-frequency (RF) receiving and transmission module, for outwards launching the latitude and longitude information parameter of this car in real time, receives the latitude and longitude information parameter that surrounding vehicles is launched simultaneously;
Data processing module, carries out dynamic process for the latitude and longitude information parameter of launching latitude and longitude information parameter and the surrounding vehicles of this car, and then calculates the distance between two cars, be specifically calculated as:
wherein E
1for the longitude information parameter of this car, E
2for the longitude information parameter of surrounding vehicles, W
1for the latitude information parameter of this car, W
2for the latitude information parameter of surrounding vehicles, S is the distance of Ben Che and surrounding vehicles, and a represents that the length that longitude and latitude 1 ° represents is 1.11 × 105m;
Display module, for showing the distance parameter of this car and surrounding vehicles in real time;
Power module, for providing electric energy needed for satellite navigation module, radio-frequency (RF) receiving and transmission module and display module.
2. a kind of automobile distance measuring system according to claim 1, is characterized in that: described data processing module adopts AVR series monolithic.
3. a kind of automobile distance measuring system according to claim 1, is characterized in that: the chip model of described radio-frequency (RF) receiving and transmission module is nRF2401.
4. a kind of automobile distance measuring system according to claim 1, is characterized in that: described satellite navigation module adopts Beijing Orient couple stars to produce satellite navigation chip Otrack-32.
5. a kind of automobile distance measuring system according to claim 1, is characterized in that: described display module adopts 12864 dot matrix type LCD display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510148018.0A CN104880704A (en) | 2015-03-31 | 2015-03-31 | Automotive distance measuring system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510148018.0A CN104880704A (en) | 2015-03-31 | 2015-03-31 | Automotive distance measuring system |
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| CN104880704A true CN104880704A (en) | 2015-09-02 |
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| CN201510148018.0A Pending CN104880704A (en) | 2015-03-31 | 2015-03-31 | Automotive distance measuring system |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009287926A (en) * | 2008-05-27 | 2009-12-10 | Alpine Electronics Inc | Navigation device and vehicle position update method |
| CN103117007A (en) * | 2013-01-25 | 2013-05-22 | 安徽大学 | Vehicle positioning and anti-collision pre-warning system based on ZigBee and GPS (global positioning system) |
-
2015
- 2015-03-31 CN CN201510148018.0A patent/CN104880704A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009287926A (en) * | 2008-05-27 | 2009-12-10 | Alpine Electronics Inc | Navigation device and vehicle position update method |
| CN103117007A (en) * | 2013-01-25 | 2013-05-22 | 安徽大学 | Vehicle positioning and anti-collision pre-warning system based on ZigBee and GPS (global positioning system) |
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Application publication date: 20150902 |