CN102759725B - Mongline digital range radar and communication method - Google Patents
Mongline digital range radar and communication method Download PDFInfo
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- CN102759725B CN102759725B CN201210264448.5A CN201210264448A CN102759725B CN 102759725 B CN102759725 B CN 102759725B CN 201210264448 A CN201210264448 A CN 201210264448A CN 102759725 B CN102759725 B CN 102759725B
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Abstract
The invention provides a mongline digital range radar and a communication method, belongs to the technical field of automobile auxiliary parking, and solves the problem that a communication system of the existing digital range radar is complex in structure, high in cost and multiple in occupation connector. The communication method of the mongline digital range radar comprises sending information codes standing for measured range information, the information codes are a binary system, a first electrical level of first duration is connected with a second electrical level of the first duration to stand for 0, a first electrical level of second duration is connected with a second electrical level of the second duration to stand for 1, time duration of the first duration and the second duration is different, and electrical level values of the first electrical levels and the second electrical levels are different. The mongline digital range radar adopts the communication method. The mongline digital range radar and the communication method can be used for a digital ultrasonic range radar on an automobile.
Description
Technical field
The invention belongs to the auxiliary technical field of parking of automobile, be specifically related to a kind of single wire digital formula range radar and the means of communication thereof.
Background technology
Along with the development of electronic technology, range radar assists the application in parking more and more extensive at automobile, and it can record the distance between vehicle front and back end and barrier, the operation thereby help driver parks, Accident prevention.
Range radar is divided into analog and digital two kinds, and due to the gap of the aspect such as anti-interference, sensitivity, the application of analog range radar is extensive far away from digital range radar.And divide from the means of measuring distance, range radar comprises ultrasonic distance measuring radar, range laser radar, infrared distance measurement radar etc., being wherein most widely used of ultrasonic distance measuring radar.
At present, digital range radar is the multiple wire system such as twin wire, four-wire type, and it is mainly made up of radar probe, control module.Radar probe is for measuring distance information, and it can have multiple, and particular location, quantity determine according to vehicle; And control module can receive the range information from radar probe, and send to the object element such as display unit, alarm unit to use for user these information.Wherein, before and after vehicle, can respectively have a control module, and each control module can be connected with multiple radar probes.
Inventor finds that in prior art, at least there are the following problems: the communication mode of existing control module is the forms such as SCI, IIC, SPI, and these communication modes are all multiple-way system (double wire system, three-wire system, four-wire systems etc.), this causes on the one hand in system the quantity of wire harness and connector many, and complex structure, cost are high; On the other hand, display unit is human-computer interaction interface, occupied interface quantity own is just more, probably cannot adapt to the multi-thread communication need of range radar (if respectively there is a control module before and after vehicle, each control module is two-wire system, display unit only for radar communication to be at least just four-wire system); Especially, if control module want communicate with multiple object elements (as display unit and alarm unit) simultaneously, its with each object element between to be connected in multiple-way system mode, more improved complexity and the cost of system.
Summary of the invention
Technical matters to be solved by this invention comprises, communication system complex structure, cost for digital range radar of the prior art be high, take the problem that interface is many, a kind of means of communication of single wire digital formula range radar are provided, its corresponding communication system is simple in structure, cost is low, it is few to take interface, and communication working stability, antijamming capability are strong, highly sensitive, consistance and interchangeability is good, communications protocol is resolved simple.
The technical scheme that solution the technology of the present invention problem adopts is a kind of means of communication of single wire digital formula range radar, comprising:
Transmission represents the information code of measured range information, described information code is scale-of-two, the second electrical level that wherein connects the first duration with the first level of the first duration represents 0, the second electrical level that connects the second duration with the first level of the second duration represents 1, this first duration is different from the time span of the second duration, and the first level is different from the level value of second electrical level.
Wherein, " communication " carried out between radar and object element (as display unit, alarm unit etc.), is mainly used in the range information of passing on radar to record; " single line " refers to that the communication between digital range radar and object element undertaken by a data lines (being one wire system); It is enough poor that " the first level is different from the level value of second electrical level " refer to that level value between the two has, thereby can be identified by communication system, for example, can be that the first level is high level, and second electrical level is low level, or can be also that the first level is low level, second electrical level be high level.
The value of carrying out representative data with different level in the multiple-way system means of communication is (as high level represents 1 and low level represents 0, otherwise certainly also can), therefore must unify with independent clock sync signal the clock of each unit in this class communication means, to determine when a data end of transmission (determine and how signal is divided in other words), therefore it at least will have an extra clock line, cannot realize single-wire communication.In the means of communication of single wire digital formula range radar of the present invention, bits per inch is according to being represented by two varying levels that join, and carry out the value of representative data by the difference of signal time length, therefore changing (while sporting the first level by second electrical level), available specific level determines a data end of transmission (division signals in other words), therefore it does not need to arrange clock line, can realize single-wire communication, thereby simplified structure, the number of ports that reduces costs and take, and can ensure communication working stability, antijamming capability is strong, highly sensitive, consistance and interchangeability are good, communications protocol is resolved simple.Especially in the time that control module is wanted to communicate with multiple object elements (as display unit and alarm unit) simultaneously, according to method of the present invention, as long as its data line is connected with multiple unit simultaneously, each unit can independently be resolved the signal obtaining, and many clock lines needn't be set.
Preferably, after described transmission represents the information code of measured range information, also comprise: send the check code that becomes radix-minus-one complement with described information code, the second electrical level that wherein connects the first duration with the first level of the first duration represents 0, and the second electrical level that connects the second duration with the first level of the second duration represents 1.
Preferably, represent the information code of measured range information in described transmission before, also comprise: send synchronizing signal, described synchronizing signal is the second electrical level of the 3rd duration.
Further preferably, described the 3rd duration is between 995 μ s to 1005 μ s.
Preferably, before described transmission synchronizing signal, also comprise: send waiting signal, described waiting signal is the first level of the 4th duration.
Further preferably, described the 4th duration is between 100ms to 150ms.
Preferably, also comprise: in the time that described single wire digital formula range radar breaks down, send fault-signal.
Preferably, described information code is 8.
Preferably, described the first duration is between 495 μ s to 505 μ s, and described the second duration is between 195 μ s to 205 μ s; Or described the second duration is between 495 μ s to 505 μ s, described the first duration is between 195 μ s to 205 μ s.
Technical matters to be solved by this invention also comprises, communication system complex structure, cost for digital range radar of the prior art be high, take the problem that interface is many, a kind of single wire digital formula range radar is provided, it is simple in structure, cost is low, it is few to take interface, and communication working stability, antijamming capability are strong, highly sensitive, consistance and interchangeability is good, communications protocol is resolved simple.
The technical scheme that solution the technology of the present invention problem adopts is a kind of single wire digital formula range radar, comprising:
For the radar probe of measuring distance;
Control module, for receiving the described radar range information recording of popping one's head in, and with the above-mentioned means of communication, described range information is sent to object element, and described control module is connected with object element by a data lines.
Wherein, control module can be the forms such as single-chip microcomputer, and it preferably can become one with radar probe, i.e. a corresponding control module of radar probe.
Because single wire digital formula range radar of the present invention can adopt the above-mentioned means of communication, therefore it is simple in structure, cost is low, it is few to take interface, and communication working stability, antijamming capability are strong, highly sensitive, consistance and interchangeability is good, communications protocol is resolved simple.
The present invention is specially adapted in the digital type ultrasound wave range radar on automobile.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the means of communication of the single wire digital formula range radar of embodiments of the invention 2;
Fig. 2 is the waveform schematic diagram sending in the means of communication of single wire digital formula range radar of embodiments of the invention 2.
Embodiment
For making those skilled in the art understand better technical scheme of the present invention, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Embodiment 1:
The present embodiment provides a kind of means of communication of single wire digital formula range radar, comprising:
Transmission represents the information code of measured range information, described information code is scale-of-two, the second electrical level that wherein connects the first duration with the first level of the first duration represents 0, the second electrical level that connects the second duration with the first level of the second duration represents 1, this first duration is different from the time span of the second duration, and the first level is different from the level value of second electrical level.
The value of carrying out representative data with different level in the multiple-way system means of communication is (as high level represents 1 and low level represents 0, otherwise certainly also can), therefore must unify with independent clock sync signal the clock of each unit in this class communication means, to determine when a data end of transmission (determine and how signal is divided in other words), therefore it at least will have an extra clock line, cannot realize single-wire communication.In the means of communication of the single wire digital formula range radar of the present embodiment, bits per inch is according to being represented by two varying levels that join, and carry out the value of representative data by the difference of signal time length, therefore changing (while sporting the first level by second electrical level), available specific level determines a data end of transmission (division signals in other words), therefore it does not need to arrange clock line, can realize single-wire communication, thereby simplified structure, the number of ports that reduces costs and take, and can ensure communication working stability, antijamming capability is strong, highly sensitive, consistance and interchangeability are good, communications protocol is resolved simple.Especially in the time that control module is wanted to communicate with multiple object elements (as display unit and alarm unit) simultaneously, according to the method for the present embodiment, as long as its data line is connected with multiple unit simultaneously, each unit can independently be resolved the signal obtaining, and many clock lines needn't be set.
Embodiment 2:
The present embodiment provides a kind of means of communication of single wire digital formula range radar, wherein single wire digital formula range radar be vehicle-mounted, for auxiliary digital type ultrasound wave range radar of parking, it carries out communication by display unit, alarm unit etc. on mode and the vehicle of one wire system.Certainly, the digital range radar of other types also can adopt the means of communication of the present embodiment.
As shown in Figure 1 and Figure 2, the means of communication of the single wire digital formula range radar of the present embodiment comprise:
S01, preparation are parked, and radar powers on.
S02, radar start to send ultrasound wave and find range; Preferably, radar sends the waiting signal of high level (i.e. the first level) simultaneously to vehicle-mounted display unit (being object element).This waiting signal is the signal sending in the stand-by period between twice transmission range information, and it should be greater than radar finds range the time used (about 2ms ~ 15ms), and should determine according to the net synchronization capability of display unit and display performance.
Preferably, waiting signal continues 100ms ~ 150ms (i.e. the 4th duration).The signal length of this duration is enough, substantially can meet the requirement of any display unit, simultaneously not long again, can not cause substantial impact to range finding effect.
S03, preferred, radar sends the synchronizing signal of low level (being second electrical level) to display unit.Synchronizing signal notice display unit is waited for and being finished, prepares to start transmission range information.
Preferably, synchronizing signal continues 995 μ s to 1005 μ s (i.e. the 3rd duration).The duration gap of this duration and waiting signal and follow-up code is all enough large, be not easy to cause decoding error, and it is not long again, can not hinder the transmission of range information.
S04, send binary information code, information code represents the distance that radar records.Preferably, information code is 8 (D0 ~ D7), because it can represent 256 data like this, if taking 2cm as unit, and can the maximum distance that represents 5.1m, can meet the needs of parking completely.
Wherein, the coding rule of this binary information code is: the low level (being second electrical level) that connects the first duration with the high level (i.e. the first level) of the first duration represents 0, the low level that connects the second duration with the high level of the second duration represents 1, and this first duration is different from the time span of the second duration.That is to say, in the present embodiment, be not to distinguish 0,1 by the difference of level, but distinguish 0,1 by the difference of signal time length.
Preferably, the first duration is (being that 0 complete signal continues about 1ms) between 495 μ s to 505 μ s, and the second duration is (being that 1 complete signal continues about 0.4ms) between 195 μ s to 205 μ s; Certainly, because 0,1 definition in coding is relative, otherwise therefore also can, the second duration is between 495 μ s to 505 μ s, the first duration is between 195 μ s to 205 μ s.
Obviously, the resolution of any communication system is all limited, therefore signal duration can not be too short (otherwise being difficult to identification); And certainly there is certain error in the transmission of signal, therefore the difference between the first duration and the second duration can not too little (otherwise identification error can occur); Meanwhile, it is short that the first duration and the second duration should be tried one's best again, to reduce the required time of transmission.And the first above duration and the preferable range of the second duration just in time can meet aforesaid three requirements simultaneously.
In the common multiple-way system means of communication, be the value that judges data by the height of level, therefore in order to distinguish, when a data is transmitted, independently clock line must be set and unify the clock of each unit, thereby cause it to be necessary for " multiple-way system ".And in the method for the present embodiment, no matter what the value of data is, according to all being connect by the high level of half, the low level of half forms bits per inch, be that its waveform is the same, just time span difference, therefore object element (display unit) receives after signal, can assert that each generation is exactly a data end of transmission (certainly also will distinguish the impact of waiting signal, synchronizing signal etc.) by low level during to the transformation of high level, independently judge its value by the duration of this bit data again, thereby it needn't use clock line, can realize single-wire communication.Meanwhile, the means of communication of the present embodiment also have that working stability, strong, the clever lightness of antijamming capability are high, consistance and interchangeability is good, signal resolution fast simple, needn't change hardware and can be by advantages such as software realizations.
In addition, another advantage of the means of communication of the present embodiment is, because its signal sending can independently be decoded by object element, do not need clock line, therefore radar only needs a data lines to get final product simultaneously to multiple object elements (as display unit, alarm unit) transmitted signals (multiple object elements are connected on this data line) simultaneously.
S05, preferred, sends the check code (V0 ~ V7) that becomes radix-minus-one complement with information code, and the coded system of check code is identical with the coded system of information code; Obviously, check code also should be 2 systems, preferably also should be 8.
Check code is the radix-minus-one complement of information code, and therefore it can play the effect of authorization information code, thereby improves the reliability of data.For example, if radar does not detect barrier, the information code of its transmission is converted to 16 systems, and (display unit changes 16 systems into process after receiving information code, and information code transmit time remain taking 2 system forms) after should be 0x00(wherein " 0x " represent that data are as 16 systems, " 00 " is actual data), and if display unit is received check code and changed into 16 systems after find that data are 0xff, think that data are correct, if decision data mistake of other data, again range finding.
By check code is set, can strengthens anti-interference, and make waveform relatively be easy to observation, thereby the reliability of communication is significantly improved.
Preferably, the means of communication of the present embodiment also comprise: in the time that radar breaks down, send fault-signal.Wherein, this fault-signal can above-mentioned information code and the form of check code send, for example, when radar breaks down, can make the value of information code and check code be 1 (or other do not meet the particular value of radix-minus-one complement rule), for example, be 0xffff if display unit receives what changed into 16 systems obtain after information code and check code, can judge that radar breaks down.By fault-signal is set, can make radar there is fault prompt facility, further improve its reliability.
S06, judge range finding whether finish, if radar is closed; Return to if not step S02, continue to send waiting signal, start range finding and communication next time.
Wherein, the first level in the present embodiment is high level, second electrical level is that low level mode is a concrete example, and it completely also can adopt second electrical level is high level, and the first level is low level mode (is whole low and high levels just in time conversely) in embodiment.
Embodiment 3:
The present embodiment provides a kind of single wire digital formula range radar, comprising:
For the radar probe of measuring distance;
Control module, for receiving the described radar range information recording of popping one's head in, and with the above-mentioned means of communication, described range information is sent to object element, and described control module is connected with object element by a data lines.
Wherein, control module can be the forms such as single-chip microcomputer, and it preferably can become one with radar probe, i.e. a corresponding control module of radar probe.
Because the single wire digital formula range radar of the present embodiment can adopt the above-mentioned means of communication, therefore it is simple in structure, cost is low, it is few to take interface, and communication working stability, antijamming capability are strong, highly sensitive, consistance and interchangeability is good, communications protocol is resolved simple.
Be understandable that, above embodiment is only used to principle of the present invention is described and the illustrative embodiments that adopts, but the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement are also considered as protection scope of the present invention.
Claims (10)
1. means of communication for single wire digital formula range radar, is characterized in that, comprising:
Transmission represents the information code of measured range information, described information code is scale-of-two, the second electrical level that wherein connects the first duration with the first level of the first duration represents 0, the second electrical level that connects the second duration with the first level of the second duration represents 1, this first duration is different from the time span of the second duration, and the first level is different from the level value of second electrical level, to make each generation just represent a data end of transmission by second electrical level to the transformation of the first level; In above-mentioned data 0 and 1, the waveform of each data is identical, and the first level and second electrical level respectively account for the half of these data.
2. the means of communication of single wire digital formula range radar according to claim 1, is characterized in that, after described transmission represents the information code of measured range information, also comprise:
Send and become the check code of radix-minus-one complement with described information code, the second electrical level that wherein connects the first duration with the first level of the first duration represents 0, and the second electrical level that connects the second duration with the first level of the second duration represents 1.
3. the means of communication of single wire digital formula range radar according to claim 1, is characterized in that, before representing the information code of measured range information, also comprise in described transmission:
Send synchronizing signal, described synchronizing signal is the second electrical level of the 3rd duration.
4. the means of communication of single wire digital formula range radar according to claim 3, is characterized in that,
Described the 3rd duration is between 995 μ s to 1005 μ s.
5. the means of communication of single wire digital formula range radar according to claim 1, is characterized in that, before described transmission synchronizing signal, also comprise:
Send waiting signal, described waiting signal is the first level of the 4th duration.
6. the means of communication of single wire digital formula range radar according to claim 5, is characterized in that,
Described the 4th duration is between 100ms to 150ms.
7. the means of communication of single wire digital formula range radar according to claim 1, is characterized in that, also comprise:
In the time that described single wire digital formula range radar breaks down, send fault-signal.
8. according to the means of communication of the single wire digital formula range radar described in any one in claim 1 to 7, it is characterized in that,
Described information code is 8.
9. according to the means of communication of the single wire digital formula range radar described in any one in claim 1 to 7, it is characterized in that,
Described the first duration is between 495 μ s to 505 μ s, and described the second duration is between 195 μ s to 205 μ s;
Or
Described the second duration is between 495 μ s to 505 μ s, and described the first duration is between 195 μ s to 205 μ s.
10. a single wire digital formula range radar, is characterized in that, comprising:
For the radar probe of measuring distance;
Control module, for receiving the described radar range information recording of popping one's head in, and with the means of communication described in any one in claim 1 to 9, described range information is sent to object element, and described control module is connected with object element by a data lines.
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| CN108205142A (en) * | 2016-12-16 | 2018-06-26 | 北京万集科技股份有限公司 | A kind of laser radar system and distance measuring method |
| CN107888339A (en) * | 2017-11-27 | 2018-04-06 | 卫星电子（中山）有限公司 | A kind of carrier wave sending method for being easy to reduce the binary code of transmission power |
| CN109901115B (en) * | 2019-04-04 | 2023-12-08 | 加特兰微电子科技(上海)有限公司 | Radar data transmission device and radar system |
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| CN201576092U (en) * | 2009-12-03 | 2010-09-08 | 刘宛莲 | Multifunctional reversing radar system |
| CN102468901A (en) * | 2010-11-02 | 2012-05-23 | 凹凸电子（武汉）有限公司 | Method for transmitting data |
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| CN201576092U (en) * | 2009-12-03 | 2010-09-08 | 刘宛莲 | Multifunctional reversing radar system |
| CN102468901A (en) * | 2010-11-02 | 2012-05-23 | 凹凸电子（武汉）有限公司 | Method for transmitting data |
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