CN108733241B - Method and apparatus for implementing contactless control - Google Patents
Method and apparatus for implementing contactless control Download PDFInfo
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- CN108733241B CN108733241B CN201710244780.8A CN201710244780A CN108733241B CN 108733241 B CN108733241 B CN 108733241B CN 201710244780 A CN201710244780 A CN 201710244780A CN 108733241 B CN108733241 B CN 108733241B
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
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Abstract
The invention relates to the technical field of electronics, and discloses a method and equipment for realizing non-contact control, wherein the method comprises the following steps: identifying different actions of the object by using the Doppler radar; judging the action type according to the identified action and generating a corresponding control signal; and controlling at least one controlled unit associated with the action type according to the control signal. The technical scheme disclosed in the application can realize non-contact multi-path control through a single Doppler radar, is not influenced by the area of a control panel, can reduce false touch, and has adjustable object induction control distance. Meanwhile, the control panel can be realized only by a single Doppler radar, so that the wiring and the structure of the control panel are relatively simple.
Description
Technical Field
The present invention relates to the field of electronic technology, and in particular to a method and apparatus for implementing contactless control.
Background
In the prior art, a non-contact control method is mainly implemented by using infrared or other visible light as a medium. Specifically, it is determined which switch is operated by light reflected from the hand, mainly by placing two receivers and one transmitter side by side on the panel. However, in the solution using infrared or visible light as medium, there are two drawbacks: firstly, the area of the switch panel is limited, in order to distinguish two-way control on the limited switch panel, only objects with small areas such as fingers can be used for control, the control distance is short, and users need to pay attention to reduce mistaken touch; secondly, the panel needs an emitting hole and a receiving hole to receive and transmit light, which results in relatively complicated wiring and structure of the control board.
Disclosure of Invention
In order to solve the above problems of the prior art, an object of the present invention is to provide a method and apparatus for implementing contactless control.
In order to achieve the above object, an aspect of the present invention provides a method for implementing contactless control, the method including: identifying different actions of the object by using the Doppler radar; judging the action type according to the identified action and generating a corresponding control signal; and controlling at least one controlled unit associated with the action type according to the control signal.
Preferably, the action type comprises one of: an object moving towards the doppler radar; an object moving away from the doppler radar; an object reciprocates relative to the doppler radar.
Preferably, identifying the different actions comprises: calculating a velocity of movement of the object relative to the doppler radar; judging whether the calculated movement speed is within a preset speed range or not; and determining the identified motion as a valid motion when the calculated motion speed is determined to be within the preset speed range; judging the action type according to the identified action and generating a corresponding control signal comprises judging the action type according to the effective action and generating a corresponding control signal.
Preferably, the method further comprises: comparing the ratio of the strength of the reflected signal received by the Doppler radar to the strength of the transmitted signal with a set threshold value; and determining the identified action as a valid action if the ratio is above the set threshold; judging the action type according to the identified action and generating a corresponding control signal comprises judging the action type according to the effective action and generating a corresponding control signal.
Preferably, the method further comprises: comparing the ratio of the strength of the reflected signal received by the Doppler radar to the strength of the transmitted signal with a set threshold value; wherein calculating the velocity of motion of the object relative to the Doppler radar comprises calculating the velocity of motion of the object relative to the Doppler radar if the ratio is above the set threshold.
Preferably, identifying different action types comprises: identifying an action over a plurality of consecutive time periods; and determining a different action type from the action identified in each of the plurality of successive time periods.
Preferably, the object is a palm of a hand.
A second aspect of the present invention provides an apparatus for enabling contactless control, the apparatus comprising: the Doppler radar is used for detecting different actions of an object and generating a detection signal according to the detected actions; and the instruction judging unit is used for receiving the detection signal, determining the action type of the object according to the detection signal, generating an instruction signal corresponding to the action type and sending the instruction signal to at least one controlled unit associated with the action type so as to control the controlled unit.
Preferably, the action type comprises one of: an object moving towards the doppler radar; an object moving away from the doppler radar; an object reciprocates relative to the doppler radar.
Preferably, the doppler radar is for: calculating a velocity of movement of the object relative to the doppler radar; judging whether the calculated movement speed is within a preset speed range or not; and generating the detection signal under the condition that the calculated movement speed is judged to be in the preset speed range.
Preferably, the doppler radar is further configured to: comparing the ratio of the strength of the reflected signal received by the Doppler radar to the strength of the transmitted signal with a set threshold value; and generating the detection signal if the ratio is higher than the set threshold.
Preferably, the doppler radar is further configured to: comparing the ratio of the strength of the reflected signal received by the Doppler radar to the strength of the transmitted signal with a set threshold value; and calculating the movement speed of the object relative to the Doppler radar when the ratio is higher than the set threshold value.
Preferably, the doppler radar is further configured to detect the motion and generate the detection signal in a plurality of consecutive time periods; and the instruction judging unit is used for receiving the detection signal and determining the action type according to the detection signal generated in each period of the plurality of continuous time periods.
Preferably, the object is a palm of a hand.
Preferably, the device further comprises at least one control circuit, and the instruction judging unit is configured to send the instruction signal to the control circuit to control at least one controlled unit associated with the action type through the control circuit.
Preferably, the instruction judging unit is further configured to ignore the detection signal received by the instruction judging unit within a preset time after the instruction signal is sent out.
Above-mentioned technical scheme can realize non-contact multi-channel control through single Doppler radar, and the area influence of control panel can reduce the mistake and touch to object response control distance is adjustable. Meanwhile, the control panel can be realized only by a single Doppler radar, so that the wiring and the structure of the control panel are relatively simple.
Drawings
FIG. 1 is a flow chart of a method for implementing contactless control according to an embodiment of the present invention;
FIG. 2 is a flowchart for determining whether an action is a valid action according to an embodiment of the present invention;
FIG. 3 is a block diagram of an apparatus for implementing contactless control according to an embodiment of the present invention;
FIG. 4 is a block diagram of an apparatus for implementing contactless control according to another embodiment of the present invention; and
FIG. 5 is a flow chart of the logic determination of the instruction determination unit according to an embodiment of the present application.
Description of the reference numerals
300 control panel 310 doppler radar
320 instruction judging unit 330 controlled unit
331 controlled unit 332 controlled unit
401 control circuit 402 control circuit
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a flowchart of a method for implementing contactless control according to an embodiment of the present application. As shown in fig. 1, the method may include: identifying different actions of the object by using the Doppler radar; judging the action type according to the identified action and generating a corresponding control signal; and controlling at least one controlled unit associated with the action type according to the control signal.
Wherein the actions include movement of an object close to the Doppler radar and movement of an object away from the Doppler radar. The action type may include one of the following: an object moving towards the doppler radar; an object moving away from the doppler radar; an object reciprocates relative to the doppler radar.
In an embodiment of the present application, a doppler radar may be used to transmit an electromagnetic wave signal and receive an electromagnetic wave signal reflected by an object. Calculating the frequency shift of the frequency of the reflected electromagnetic wave signal relative to the frequency of the transmitted electromagnetic wave signal, and calculating the direction and speed of the motion of the object by combining the following formulas:
wherein f isdIs a frequency shift, which is the difference between the frequency of the reflected electromagnetic wave signal and the frequency of the transmitted electromagnetic wave signal; v is the object moving speed; λ is the wavelength. When f isdWhen positive, it means that the object is near the Doppler radar, and when fdNegative numbers indicate that the object is far from the doppler radar. Accordingly, when v is a positive number, it indicates that an object is near the doppler radar, and when v is a negative number, it indicates that an object is far from the doppler radarLe radar.
The type of motion of the object may be determined by the direction of the detected motion of the object and its changes.
Preferably, whether the calculated movement speed is within a preset speed range or not may be determined through the calculated movement speed of the object relative to the doppler radar, and the identified motion is determined to be an effective motion under the condition that the calculated movement speed is determined to be within the preset speed range, and then a motion type is determined according to the effective motion and a corresponding control signal is generated. The preset speed range can be set according to actual needs, for example, the preset speed range can be set to 0.5-2 km/h.
By the method for judging whether the motion is effective or not according to the motion speed of the object, misjudgment caused by the conditions of throwing objects (the speed is too high) or passing objects in parallel (the component speed in the normal direction of the radar is small, and the normal direction of the radar is perpendicular to the panel) and the like can be avoided.
As a preferred embodiment of the present application, a ratio of the strength of the reflected signal received by the doppler radar to the strength of the transmitted signal may be compared with a set threshold, and if the ratio is higher than the set threshold, the identified motion may be determined as an effective motion, and a motion type may be determined according to the effective motion, and a corresponding control signal may be generated.
The set threshold may be determined according to an effective detection distance between the desired object and the radar, and the set threshold may be a minimum reflected signal strength ratio threshold. Electromagnetic wave signals transmitted by the doppler radar are transmitted in the air, reflected and scattered by an object, and the like, so that the signal intensity is attenuated. Therefore, according to the adjustment of the ratio of the received reflected signal strength to the transmitted signal strength, the radar can be controlled to respond to the actions of the objects in different ranges. As will be appreciated by those skilled in the art, the greater the set threshold, the smaller the effective range of the object; the smaller the threshold value is set, the larger the effective working distance of the object.
Alternatively, a maximum intensity reflected signal intensity ratio threshold may be set, and a section defining a reflected signal intensity ratio with the minimum intensity reflected signal intensity ratio threshold may be performed, so as to define an effective operating distance of the object. And comparing the ratio of the intensity of the reflected signal received by the Doppler radar to the intensity of the transmitted signal with a set threshold interval, determining the identified action as an effective action under the condition that the ratio is within the set threshold interval, judging the action type according to the effective action and generating a corresponding control signal.
Fig. 2 is a flowchart for determining whether an operation is a valid operation according to an embodiment of the present invention. As shown in fig. 2, it can be determined whether the motion is valid or not according to the speed of the object and the strength ratio of the reflected signal to the transmitted signal. For example, the doppler radar may measure the moving speed and/or direction of the object when the received signal strength ratio and the transmitted signal strength ratio are higher than a set threshold, and determine the motion as the effective motion when the moving speed of the object is within a preset speed range.
In a preferred embodiment of the embodiments of the present application, identifying different action types comprises: identifying an action over a plurality of consecutive time periods; and determining a different action type from the action identified in each of the plurality of successive time periods.
The doppler radar can periodically detect the motion direction of the object, for example, it can deduce whether the object is close to the doppler radar motion (hereinafter referred to as close motion) or far from the doppler radar motion (hereinafter referred to as far motion) in each period. The type of motion may be determined based on a permutation or combination of motions of the doppler radar over successive periods. For example, the approach motion, and the away motion occurring in three consecutive cycles may be determined as one motion type, and the away motion, the approach motion, and the away motion may be determined as another motion type. And then different action types are formed by the arrangement or combination of different actions, corresponding control signals are generated according to the action types, and finally, the controlled units corresponding to the action types are controlled according to the control signals.
In case of only two controlled units, the action type may be determined by detecting the action within one cycle only, i.e. the action type comprises only an approaching action and a departing action. The motion may also be detected in multiple cycles to determine the motion type, for example, the motion may be detected in two consecutive cycles, in which case the approach motion and the approach motion may be determined as one motion type, and the away motion may be determined as another motion type. The method for determining the same action in two continuous periods as one action type can improve the accuracy of judging the action of the object and effectively reduce the occurrence of misjudgment. It will be understood by those skilled in the art that the same motion in three or more consecutive cycles may also be determined as one motion type according to actual needs.
The period may be set according to various parameters of the radar, the operation time, and the general moving distance and speed of the object in actual conditions, and may be set to 200 milliseconds, for example.
Preferably, in order to determine the motion of the object, the doppler radar may perform motion detection once in one cycle. In order to improve accuracy, the doppler radar may also perform multiple motion detections within one cycle.
Preferably, it can be determined whether the motion is a valid motion according to the speed of the object and the reflected signal to transmitted signal strength ratio. For example, the radar may measure the moving speed of the object only when the received signal strength ratio is higher than a set threshold, and determine the motion as the effective motion only when the moving speed of the object is within a preset speed range.
Optionally, it may also be determined whether the action type composed of the actions is a valid action type by determining whether the actions are valid actions, for example, the action type may be determined to be a valid action type when all actions in the composed action types are valid actions; when one of the component action types is invalid, the control signal may be generated based on the other valid action by ignoring the invalid action, and when two of the component action types are invalid, the action type may be set as an invalid action type. It will be appreciated by those skilled in the art that the above method of determining whether an action type is a valid action type may be implemented by other feasible methods according to actual needs.
Preferably, the doppler radar may be a single-shot single-receive doppler radar, and the object may be a palm of the hand.
Fig. 3 is a block diagram of an apparatus for implementing contactless control according to an embodiment of the present invention. As shown in fig. 3, the present application also provides an apparatus for implementing contactless control, the apparatus comprising: a doppler radar 310 for detecting different motions of an object and generating a detection signal according to the detected motions; and an instruction judging unit 320, configured to receive the detection signal, determine an action type of the object according to the detection signal, generate an instruction signal corresponding to the action type, and send the instruction signal to at least one controlled unit 330 associated with the action type, so as to control the controlled unit 330.
The doppler radar 310 may be located in the control panel 300, and detect the movement of an object (e.g., a palm) located in a certain range in front of the control panel 300. The command determining unit 320 may also be located in the control panel 300, connected to the doppler radar, and configured to send a command signal to the controlled unit 330 outside the control panel 300. It will be understood by those skilled in the art that the instruction determining unit 320 may be located outside the control panel 300.
Preferably, the action type may comprise one of: an object moving towards the doppler radar 310; objects moving away from the doppler radar 310; the object reciprocates relative to the doppler radar 310.
As a preferred embodiment of the present invention, the doppler radar 310 may be further configured to: the moving speed of the object with respect to the doppler radar 310 is calculated, and it is determined whether the calculated moving speed is within a preset speed range, and a detection signal is generated under the condition that it is determined that the calculated moving speed is within the preset speed range.
Preferably, the doppler radar 310 is further configured to compare a ratio of the strength of the reflected signal received by the doppler radar 310 to the strength of the transmitted signal with a set threshold, and generate a detection signal if the ratio is higher than the set threshold.
More preferably, whether to generate the detection signal may be determined simultaneously according to the speed of the object and the strength ratio of the reflected signal to the transmitted signal. For example, the doppler radar 310 may measure the moving speed of the object when the received signal strength ratio is higher than a set threshold, and may generate the detection signal when the moving speed of the object is within a preset speed range.
In a preferred embodiment of an embodiment of the present application, the doppler radar 310 is further configured to detect motion of an object in a plurality of consecutive time periods and generate a detection signal, and the instruction determining unit 320 is configured to receive the detection signal and determine the type of motion according to the detection signal generated in each of the plurality of consecutive time periods.
For example, the doppler radar 310 may detect whether an object is moving close to the doppler radar 310 (hereinafter referred to as close movement) or moving away from the doppler radar 310 (hereinafter referred to as far movement) in a plurality of cycles, and generate corresponding close detection signals and far detection signals. The instruction determination unit 320 may determine an action type according to an arrangement or a combination of the approach detection signal and the distance detection signal transmitted by the doppler radar 310 in a plurality of cycles, and generate an instruction signal corresponding to the action type.
In the case of only two controlled units 330, the command determining unit 320 may determine the action type according to the detection signal received in one cycle, and then generate a corresponding command signal. The instruction judging unit 320 may also determine one action type according to the same detection signal in two or more consecutive cycles.
In one embodiment of the present application, the doppler radar 310 periodically calculates the direction, speed and signal strength ratio of the object according to the set parameters. The period may be set to T200 ms in consideration of the doppler radar 310 operation time, the object movement distance and speed in the normal operation, and the like. The doppler radar 310 and the command determining unit 320 may transmit signals through two GPIO (General Purpose Input/Output) ports or other types of communication interfaces. If a GPIO port is used, it may be set that an action is detected in each period, and on the premise that the speed and signal strength ratio of the action are detected to meet the above conditions, the doppler radar 310 sends a detection signal to the instruction determination unit 320 through the GPIO port corresponding to the action, where the detection signal may be a low level lasting 200ms, and if no action is detected, a high level lasting 200ms is output.
In a preferred embodiment of the present application, the doppler radar 310 may output a high level to both GPIO ports when no object motion is detected. When the approach action is judged, outputting a low level of one period to the instruction judging unit 320 through the first GPIO port; when the remote action is determined, a low level of one period is output to the instruction determination unit 320 through the second GPIO port. More preferably, in order to improve the accuracy of the determination of the motion of the object, the command signal may be generated when the doppler radar 310 outputs a detection signal indicating the same motion in two consecutive cycles. For example, after receiving a low level output by a certain GPIO port of the doppler radar 310 at a time point T, wait for, for example, 300ms (or other time duration within a range of greater than 1T and less than 2T may be selected), that is, T +1.5T, and then detect whether the GPIO port is still at the low level again. If both times are low, a command signal is sent to the corresponding controlled unit 330.
As a preferred implementation of an embodiment of the present application, the apparatus further comprises at least one control circuit. Fig. 4 shows an embodiment including two control circuits, in which a solid line indicates a signal transmission relationship between devices and a broken line indicates a propagation direction of an electromagnetic wave signal. As shown in fig. 4, a doppler radar 310, an instruction decision 320, a control circuit 401, and a control circuit 402 may be included in the control panel 300. The doppler radar transmits a detection signal indicating the direction of movement of an object (e.g., a palm) to the instruction determination unit through two communication interfaces. The command judging unit 320 may be configured to send a command signal to the control circuit 401 and the control circuit 402 to control at least one of the controlled unit 331 or the control unit 332 associated with the action type through the control circuit. The control circuit may be, for example, a switch circuit, and the corresponding control panel 300 may be a multi-way switch panel. The switching control of different controlled units 330 can be realized by different action types in front of the switch panel judged by the doppler radar 310 and the instruction judgment unit 320.
Preferably, the instruction judging unit 320 is further configured to ignore the received detection signal within a preset time after the instruction signal is issued. The preset time can be set according to actual needs. For example, it may be set to ignore any detection signal transmitted from the doppler radar 310 within 1s after the instruction judging unit 320 transmits an instruction signal to a certain control circuit or the controlled unit 330. The preset time can be understood as the minimum operation interval of the object (for example, the palm) operating the control panel 300, and by reasonably setting the preset time, the misoperation caused by the natural reciprocating of the object can be shielded.
Fig. 5 is a flowchart for logic determination of the command determination unit according to an embodiment of the present application, and as shown in fig. 5, in an embodiment, the command determination unit 320 acquires the detection signal again within 1.5T after receiving the detection signal, and determines whether the two detection signals indicate the same motion direction of the object. When the two detection signals indicate the same motion direction of the object, an instruction signal is sent to the control circuit of the controlled unit 330 corresponding to the motion type composed of the two detection signals, and all the detection signals are ignored within 1 second. After 1 second, the instruction judging unit 320 continues to acquire the detection signal.
The combination of some implementation manners and technical features described in the method provided by the present application is also applicable to the device, and is not described herein again.
Through above-mentioned technical scheme, can realize non-contact multi-channel control through single doppler radar, the area influence of control panel can reduce the mistake and touch to object response control distance is adjustable. Meanwhile, the control panel can be realized only by a single Doppler radar, so that the wiring and the structure of the control panel are relatively simple. And the adjustment of the control distance is realized by setting different strength ratio thresholds of the received and transmitted signals of the Doppler radar. And the method also realizes more accurate judgment of the motion of the object by detecting the motion speed of the object, and reduces misoperation caused by natural reciprocation of the object by setting the minimum operation interval.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, numerous simple modifications can be made to the technical solution of the invention, including combinations of the individual specific technical features in any suitable way. The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.
Claims (12)
1. A method for implementing contactless control, the method comprising:
identifying different actions of the object by using the Doppler radar;
judging the action type according to the identified action and generating a corresponding control signal; and
controlling at least one controlled unit associated with the action type according to the control signal;
before determining the type of motion from the identified motion and generating a corresponding control signal, the method further comprises:
comparing the ratio of the strength of the reflected signal received by the Doppler radar to the strength of the transmitted signal with a set threshold value; and
calculating a velocity of movement of the object relative to the doppler radar;
judging whether the calculated movement speed is within a preset speed range or not;
determining the identified action as an effective action under the conditions that the ratio is higher than the set threshold and the calculated movement speed is judged to be within the preset speed range;
judging the action type according to the identified action and generating a corresponding control signal comprises judging the action type according to the effective action and generating a corresponding control signal.
2. The method of claim 1, wherein the action type comprises one of:
an object moving towards the doppler radar;
an object moving away from the doppler radar;
an object reciprocates relative to the doppler radar.
3. The method of claim 2, further comprising:
calculating the velocity of motion of the object relative to the doppler radar comprises calculating the velocity of motion of the object relative to the doppler radar if the ratio is above the set threshold.
4. The method of claim 2, wherein identifying different action types comprises:
identifying an action over a plurality of consecutive time periods; and
determining a different action type from the actions identified in each of the plurality of successive time periods.
5. The method of claim 1, wherein the object is a palm of a hand.
6. An apparatus for implementing contactless control, the apparatus comprising:
the Doppler radar is used for detecting different actions of an object and generating a detection signal according to the detected actions; and
the instruction judging unit is used for receiving the detection signal, determining the action type of the object according to the detection signal, generating an instruction signal corresponding to the action type and sending the instruction signal to at least one controlled unit associated with the action type so as to control the controlled unit;
the doppler radar is further configured to:
comparing the ratio of the strength of the reflected signal received by the Doppler radar to the strength of the transmitted signal with a set threshold value; and
calculating a velocity of movement of the object relative to the doppler radar;
judging whether the calculated movement speed is within a preset speed range or not;
and generating a detection signal according to a comparison result of the ratio and the set threshold value and a judgment and calculation result of the movement speed.
7. The apparatus of claim 6, wherein the action type comprises one of:
an object moving towards the doppler radar;
an object moving away from the doppler radar;
an object reciprocates relative to the doppler radar.
8. The apparatus of claim 7, wherein the Doppler radar is further configured to:
calculating a speed of movement of the object relative to the Doppler radar if the ratio is above the set threshold.
9. The apparatus of claim 7,
the Doppler radar is further configured to detect the motion and generate the detection signal over a plurality of consecutive time periods; and
the instruction judging unit is used for receiving the detection signal and determining the action type according to the detection signal generated in each period of the plurality of continuous time periods.
10. The apparatus of claim 6, wherein the object is a palm of a hand.
11. The apparatus according to claim 6, further comprising at least one control circuit, wherein the command determining unit is configured to send the command signal to the control circuit to control at least one of the controlled units associated with the action type through the control circuit.
12. The apparatus according to claim 6, wherein the command determining unit is further configured to ignore the detection signal received by the command determining unit within a preset time after the command signal is issued.
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| US6127965A (en) * | 1998-07-23 | 2000-10-03 | Eaton-Vorad Technologies, L.L.C. | Method and apparatus for rejecting rain clutter in a radar system |
| CN102156282B (en) * | 2011-03-25 | 2013-02-06 | 电子科技大学 | Method for detecting radar target based on micro-Doppler effect |
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| CN101155363A (en) * | 2006-09-30 | 2008-04-02 | 海尔集团公司 | Method and apparatus for implementing mobile phone control by action induction |
| CN101369248A (en) * | 2007-08-16 | 2009-02-18 | 联想(北京)有限公司 | Method, system and terminal for automatic control terminal |
| CN104678828A (en) * | 2013-12-03 | 2015-06-03 | 南充鑫源通讯技术有限公司 | Microwave induction control method and microwave induction control device |
| CN104868897A (en) * | 2014-02-25 | 2015-08-26 | 南充鑫源通讯技术有限公司 | Motion-sensing switch control method and device thereof |
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