CN105319547A - Barrier detection system and barrier detection method through adoption of barrier detection system - Google Patents
Barrier detection system and barrier detection method through adoption of barrier detection system Download PDFInfo
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- CN105319547A CN105319547A CN201410379074.0A CN201410379074A CN105319547A CN 105319547 A CN105319547 A CN 105319547A CN 201410379074 A CN201410379074 A CN 201410379074A CN 105319547 A CN105319547 A CN 105319547A
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Abstract
A barrier detection system comprises a processor, an electromagnetic wave transmission unit electrically connected with the processor and an annunciator. The processor includes a storage unit, a calculation unit, a comparison unit and a control unit. The storage unit is configured to store return loss at different frequency points in the work frequency bands of the electromagnetic wave transmission unit and reference values with respect to the corresponding frequency points and set according to a distance to be detected. The calculation unit is configured to calculate the actual return loss of the electromagnetic wave transmission unit in the usage process to obtain a difference value of the return loss and the return loss with respect to the corresponding frequency points stored in the storage unit. The comparison unit is configured to compare the difference value with the corresponding reference value. When the difference value is larger than the corresponding reference value through adoption of the comparison unit, it is determined that there is provided a barrier existing in the detection distance of the electromagnetic wave transmission unit, and the information that the barrier is existing in the detection distance of the electromagnetic wave transmission unit is fed back to the control unit to allow the control unit to control the work of the annunciator.
Description
Technical field
The present invention relates to a kind of barrier detection system, particularly relate in a kind of reversing process, the barrier detection system that the barrier at automobile rear is detected and the barrier detection method being used to this system.
Background technology
In reversing automobile process, first perception is usually needed to be positioned at the barrier at automobile rear, to avoid clobber in reversing process.The current afterbody being generally used in automobile installs radar probe, before reversing, first use radar probe to send ultrasonic signal, signal produces echoed signal when running into barrier, the radar controller that automobile is installed receives the laggard row data processing of echoed signal, judges the position of the barrier being positioned at automobile rear.So, can there is certain blind area during the ultrasonic signal that above-mentioned radar sends, the barrier in blind area cannot be detected, therefore, in reversing process, when using the barrier of radar to automobile rear to detect, accurately can not detect the barrier in all positions, automobile rear.
Summary of the invention
In view of above-mentioned condition, be necessary to provide a kind of can the barrier detection system of barrier and barrier detection method in blind area, detecting vehicle rear.
A kind of barrier detection system, whether barrier is had in order to detect automobile rear, this barrier detection system comprises attention device, this obstacle detecting system also comprises electromagnetic radiation unit and processor, this electromagnetic radiation unit and this attention device are all electrically connected with this processor, this electromagnetic radiation unit is in order to emitting electromagnetic wave, this processor comprises storage unit, computing unit, comparing unit and control module, this cell stores has turn back loss and the reference value corresponding to corresponding frequencies point set by the distance that will detect at this electromagnetic radiation unit different frequency point place in the frequency of operation section of this electromagnetic radiation unit, this computing unit is for calculating the in use actual loss of turning back of this electromagnetic radiation unit to draw the difference of losing of turning back corresponding to the corresponding Frequency point that this turn back loss and memory cell are stored up, this comparing unit compares this difference and corresponding reference value, obtain this difference be greater than corresponding reference value when this comparing unit compares, then determine that this electromagnetic radiation unit exists barrier in the distance that will detect, and this electromagnetic radiation unit is existed barrier and feeds back to this control module in the distance of detecting, attention device work is controlled to make this control module.
A kind of barrier detection method, comprises the following steps:
Above-mentioned barrier detection system is provided;
The loss of turning back that different frequency point place is corresponding in frequency of operation section of electromagnetic radiation unit is stored in storage unit;
Set the reference value in this frequency band corresponding to above-mentioned different frequency point according to the distance that will detect, and be stored in storage unit;
Computing unit calculates the loss of turning back of electromagnetic radiation unit reality in use procedure, and the difference of losing of turning back that the loss of turning back calculating this reality is corresponding with corresponding frequencies point in this storage unit with storage;
Comparing unit compares this difference reference value corresponding with corresponding frequencies point place, to determine whether this electromagnetic radiation unit has barrier in the distance that will detect;
This attention device work of output control that this control module exports according to this comparing unit.
Barrier detection system in the present invention utilizes around electromagnetic radiation unit has barrier can change the radiation field shape of electromagnetic radiation unit, thus cause the principle of losing and changing of turning back of electromagnetic radiation unit, by setting reference value, reference value corresponding with this set Frequency point with the difference of losing of turning back of the corresponding frequencies point that memory cell is stored up for the loss of turning back of electromagnetic radiation unit reality is compared, to judge whether electromagnetic radiation unit has barrier in the distance that will detect.Further, as long as there is the radiation field shape that barrier can change electromagnetic radiation unit around electromagnetic radiation unit, the loss of turning back of electromagnetic radiation unit will be lost different with turning back of Frequency point corresponding to storage unit from storing, and therefore can not there is blind area.Further, as long as must be less by the reference value corresponding to each frequency, then detecting distance be far away.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of barrier detection system of the present invention.
Fig. 2 is the process flow diagram of the systems scan of barrier detection shown in Fig. 1 barrier.
Main element symbol description
| Barrier detection system | 100 |
| Electromagnetic radiation unit | 10 |
| Transmitter | 11 |
| Feeder line | 12 |
| Array antenna | 13 |
| Processor | 30 |
| Storage unit | 31 |
| Computing unit | 32 |
| Comparing unit | 33 |
| Control module | 34 |
| Attention device | 50 |
Following embodiment will further illustrate the present invention in conjunction with above-mentioned accompanying drawing.
Embodiment
Refer to Fig. 1, whether the barrier detection system 100 that embodiment of the present invention provides has barrier in order to detect automobile rear, and it comprises electromagnetic radiation unit 10, processor 30 and attention device 50.Processor 30 is electrically connected with electromagnetic radiation unit 10 and attention device 50.Processor 30 can judge whether automobile rear has barrier to work optionally to control attention device 50.In present embodiment, attention device 50 is loudspeaker.
Electromagnetic radiation unit 10 comprises the transmitter 11, feeder line 12 and the array antenna 13 that connect successively.Feeder line 12 and array antenna 13 junction are the input end of array antenna, are also feeding point.Array antenna 13 is fixed on automobile tail (not shown).Feeder line 12 has default characteristic impedance.When the input impedance of array antenna 13 equals the characteristic impedance of feeder line 12, feeder line 12 does not have reflection wave, only has incident wave.When the input impedance of array antenna 13 is not mated with the characteristic impedance of feeder line 12, portion of energy is absorbed, unabsorbed energy will reflect back to form reflection wave, now there is incidence in feeder line 12 simultaneously and will involve reflection wave, namely can have loss (ReturnLoss) of turning back.When the surrounding of array antenna 13 does not have a barrier, the characteristic due to array antenna 13 self can cause different frequency point place correspondence in the frequency of operation section of array antenna 13 to there is loss of specifically turning back, and the turning back loss difference corresponding to different frequency point.In actual use, when there is barrier in array antenna 13 surrounding, because barrier can change the radiation field shape of array antenna 13, the frequency of operation section of array antenna 13 is caused to offset, and loss occurrence change of turning back, what in the frequency band namely after skew, different frequency point place was corresponding turn back, and loss is lost different with turning back when not having barrier around array antenna 13 corresponding to the interior corresponding Frequency point of array antenna 13 frequency of operation section.Barrier from array antenna 13 more away from, then array antenna 13 difference that the loss of turning back of different frequency point is lost with corresponding stored turning back in storage unit 31 in actual operating frequency section is less.
Processor 30 comprises storage unit 31, computing unit 32, comparing unit 33 and control module 34.The characteristic stored in storage unit 31 due to array antenna 13 itself causes array antenna 13 in a band frequency, different turn back loss and the reference value corresponding to different frequency point corresponding to different frequency point.In present embodiment, this reference value sets according to the distance of the distance that will detect, at the basis of reference losing and store the corresponding difference of losing of turning back with storage unit 31 of turning back at actual operating frequency point place when this reference value uses as array antenna 13 reality.Reference value corresponding to each Frequency point sets according to wanting the distance of obstruction detection.
Computing unit 32 is in order to the loss of turning back of computing array antenna 13 actual operating frequency point in use procedure, and calculate turning back and being stored in storage unit 31 difference of losing of turning back stored corresponding to respective frequencies point of this reality, and this difference is fed back to comparing unit 33.Comparing unit 33 compares in order to the standard value compared corresponding to this difference and this respective frequencies point, to determine whether array antenna 13 has barrier in the distance that will detect.Comparing unit 33 can will determine that array antenna 13 has the result feedback of barrier to control module 34 in the distance that will detect.Control module 34 has the output control attention device 50 of barrier to work according to the array antenna 13 that comparing unit 33 feeds back in the distance that will detect.In present embodiment, obtain this difference be less than standard value corresponding to this corresponding frequencies point when comparing unit 33 compares, then judge that array antenna 13 exists barrier in the distance that will detect, and array antenna 13 is existed in the distance that will detect the result feedback control module 34 of barrier, control attention device 50 to make control module 34 and work.In present embodiment, when the reference value of each Frequency point place setting is less, this barrier detection system 100 detects array antenna 13 has the distance of barrier far away.
Refer to Fig. 2, the barrier detection method of Use barriers thing detecting system 100 comprises the following steps:
S101: loss of turning back corresponding for different frequency point place in array antenna 13 frequency of operation section is stored in storage unit 31;
Loss of turning back in the frequency of operation section of this array antenna 13 corresponding to different frequency point is the loss of turning back caused by the characteristic of array antenna 13 itself.
S102: set the reference value in this frequency band corresponding to different frequency point according to the distance that will detect, and be stored in storage unit 31;
This reference value is as the turn back basis of reference that lose with storage unit 31 store corresponding the turn back difference of losing of array antenna 13 in actual operating frequency point place.
S103: computing unit 32 calculates the loss of turning back of array antenna 13 reality in use procedure, and calculate this reality turn back loss be stored in the interior corresponding difference of losing of turning back of this storage unit 31;
S104: this difference is fed back to this comparing unit 33 by computing unit 32;
S105: comparing unit 33 compares this difference and respective frequencies point place reference value;
When this difference is greater than this reference value, then comparing unit 33 determines that array antenna 13 exists barrier in distance corresponding to setting reference value, jumps to S106, anti-, performs S105 always.
S106: comparing unit 33 will determine that array antenna 13 exists the result feedback of barrier to control module 34 in the distance that will detect;
S107: control module 34 controls attention device 50 and works.
Barrier detection system 100 in the present invention utilizes around array antenna 13 has barrier can change the radiation field shape of array antenna 13, thus cause the principle Tong Over setting reference value of losing and changing of turning back of array antenna 13, reference value corresponding with this set Frequency point for the difference of losing of turning back of turn back loss and the interior corresponding frequencies point stored of storage unit 31 of array antenna 13 reality is compared, to judge whether array antenna 13 has barrier in the distance that will detect.Further, as long as there is the radiation field shape that barrier can change array antenna 13 around array antenna 13, the loss of turning back of array antenna 13 will be lost different with turning back of Frequency point corresponding to storage unit 31 from storing, and therefore can not there is blind area.Further, as long as must be less by the reference value corresponding to each frequency, then detecting distance be far away.
In addition, those skilled in the art also can do other change in spirit of the present invention, and certainly, these changes done according to the present invention's spirit, all should be included in the present invention's scope required for protection.
Claims (7)
1. a barrier detection system, whether barrier is had in order to detect automobile rear, this barrier detection system comprises attention device, it is characterized in that: this obstacle detecting system also comprises electromagnetic radiation unit and processor, this electromagnetic radiation unit and this attention device are all electrically connected with this processor, this electromagnetic radiation unit is in order to emitting electromagnetic wave, this processor comprises storage unit, computing unit, comparing unit and control module, this cell stores has turn back loss and the reference value corresponding to corresponding frequencies point set by the distance that will detect at this electromagnetic radiation unit different frequency point place in the frequency of operation section of this electromagnetic radiation unit, this computing unit is for calculating the in use actual loss of turning back of this electromagnetic radiation unit to draw the difference of losing of turning back corresponding to the corresponding Frequency point that this turn back loss and memory cell are stored up, this comparing unit compares this difference and corresponding reference value, obtain this difference be greater than corresponding reference value when this comparing unit compares, then determine that this electromagnetic radiation unit exists barrier in the distance that will detect, and this electromagnetic radiation unit is existed barrier and feeds back to this control module in the distance of detecting, attention device work is controlled to make this control module.
2. barrier detection system as claimed in claim 1, is characterized in that: this reference value sets according to the distance that will detect, and detect distance far away, set this electromagnetic radiation unit reference value corresponding to different frequency point in frequency of operation section less.
3. barrier detection system as claimed in claim 1, it is characterized in that: this electromagnetic radiation unit comprises the transmitter, feeder line and the array antenna that are electrically connected successively, the radiation field shape of this array antenna can be changed when there is barrier around this array antenna, thus cause the frequency of operation section of this array antenna to offset, and loss occurrence change of turning back, when barrier from this array antenna more away from, the turning back loss of this array antenna in actual operating frequency section is less with corresponding stored difference of losing of turning back of corresponding frequencies in this storage unit.
4. a barrier detection method, comprises the following steps:
Barrier detection system as claimed in claim 1 is provided;
The loss of turning back that different frequency point place is corresponding in frequency of operation section of electromagnetic radiation unit is stored in storage unit;
Set the reference value in this frequency band corresponding to above-mentioned different frequency point according to the distance that will detect, and be stored in storage unit;
Computing unit calculates the loss of turning back of electromagnetic radiation unit reality in use procedure, and the difference of losing of turning back that the loss of turning back calculating this reality is corresponding with corresponding frequencies point in this storage unit with storage;
Comparing unit compares this difference reference value corresponding with corresponding frequencies point place, to determine whether this electromagnetic radiation unit has barrier in the distance that will detect;
This attention device work of output control that this control module exports according to this comparing unit.
5. barrier detection method as claimed in claim 4, also comprise this computing unit and this difference is fed back to this comparing unit, this comparing unit compares and obtains this difference and be greater than reference value corresponding to corresponding frequencies point place, to determine that this electromagnetic radiation unit has barrier in the distance that will detect.
6. barrier detection method as claimed in claim 5, it is characterized in that: also comprising this comparing unit will determine that this electromagnetic radiation unit exists the result feedback of barrier to this control module in the distance that will detect, and this control module exists the output control attention device work of barrier according to this electromagnetic radiation unit that this comparing unit feeds back in the distance that will detect.
7. barrier detection method as claimed in claim 4, is characterized in that: this reference value sets according to the distance that will detect, and detect distance far away, set this electromagnetic radiation unit reference value corresponding to different frequency point in frequency of operation section less.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109529171B (en) * | 2018-12-26 | 2021-07-13 | 速眠创新科技（深圳）有限公司 | Method and device for determining sleep-aid area, computer equipment and storage medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109529171B (en) * | 2018-12-26 | 2021-07-13 | 速眠创新科技（深圳）有限公司 | Method and device for determining sleep-aid area, computer equipment and storage medium |
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Application publication date: 20160210 |