CN105572659A - Use of radio frequency signals to determine the distance of an object - Google Patents
Use of radio frequency signals to determine the distance of an object Download PDFInfo
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- CN105572659A CN105572659A CN201510530617.9A CN201510530617A CN105572659A CN 105572659 A CN105572659 A CN 105572659A CN 201510530617 A CN201510530617 A CN 201510530617A CN 105572659 A CN105572659 A CN 105572659A
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- destination object
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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
- G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
- G01S11/02—Systems for determining distance or velocity not using reflection or reradiation using radio waves
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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
- G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
- G01S11/12—Systems for determining distance or velocity not using reflection or reradiation using electromagnetic waves other than radio waves
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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
- G01S13/50—Systems of measurement based on relative movement of target
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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
- G01S13/66—Radar-tracking systems; Analogous systems
- G01S13/72—Radar-tracking systems; Analogous systems for two-dimensional tracking, e.g. combination of angle and range tracking, track-while-scan radar
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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
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/50—Systems of measurement based on relative movement of target
-
- 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
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/66—Tracking systems using electromagnetic waves other than radio waves
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The disclosure relates to the use of radio frequency signals to determine the distance of an object, specifically, an object tracking system capable of calculating the distance to a target object. During operation, the system can use a radio antenna to receive a first radio signal pattern from the direction of the target object. The system can determine the time interval based on the received radio signal pattern, and determine the rate of a local system. Then, the system determines the distance to the target object based on the time interval and the rate of the object tracking device.
Description
related application
This application claims the U.S. Provisional Application being entitled as " USINGRFTECHNOLOGYTODETERMINEDISTANCE " the 62/042nd submitted to by inventor HansWang, TaoLi, BingleiZhang and ShihHsiungMo on August 27th, 2014, the right of priority of No. 722 (attorney docket AVC14-1004PSP).
Technical field
The disclosure relates generally to object detection.More specifically, the disclosure relates to from destination object scanning of radio pattern (signalpattern) to determine the distance of destination object.
Background technology
Many real-time systems can benefit from the accurate distance determining remote object.Such as, aircraft generally includes radar system, and it is by detecting remote object from destination object reflected microwave signal.These radar systems can detect the object of number mile, but require that the size of destination object is larger.
The oriented user of many consumer product design provides the intelligent parts of useful information.Such as, some Hyundai Motors are equipped with sensor, and it can provide information about motor vehicle environment for driver.But these sensors are usually limited to and detect when automobile turning lane, or detect another automobile when in the blind spot of driver.
In addition, these blind spot detection systems are furnished with sensor, and it only can detect relatively near object, such as use sonar or infrared (IR) system.These sonars and IR system, by carrying out detected target object from destination object reflect sound or IR light beam, therefore require the Clear Line Of Sigh to destination object.Unfortunately, these systems can not detect remote object, especially when the sight line for remote object is stopped by other objects.What is worse, IR system can stand the signal disturbing from operating environment, this range observation of just reading value or mistake that can lead to errors.
Therefore, can not use sonar and IR system reliably determine remote object (such as still distance a block close to vehicle) distance.In addition, be not easy to arrange advanced object detection systems (such as radar) the consumer goods (as automobile) are upper because these radar systems usually comparatively large, consume very large electricity and be very much costliness for ordinary consumer.
Summary of the invention
An embodiment provides a kind of object-tracking systems, and it contributes to the distance calculating destination object.During operation, system can use wireless aerial to receive the first radio signal pattern in the direction from destination object.System determines the time interval with received radio signal pattern, and determines the speed of local system.Then, system calculates the distance of destination object based on the speed of the time interval and object tracking device.
In certain embodiments, system can head for target object channeling direction antenna, receives the radio signal pattern from destination object and the radio signal pattern do not received from other objects.
In certain embodiments, radio signal pattern comprises the first signal pattern, and secondary signal pattern is followed after the first signal pattern.In addition, the time interval can comprise the difference between the very first time stamp of the first signal pattern and the second timestamp of secondary signal pattern.
In certain embodiments, the time interval is determined according to the signal frequency of radio signal pattern.
In certain embodiments, system can calculate the speed of destination object relative to the motion of object tracking device.
In certain embodiments, system can determine the time interval (it shows the motion of object tracking device) adjusted, and based on the calculated absolute speed calculating destination object to the distance of destination object and the time interval of adjustment.
In certain embodiments, while computation rate, system responses match in regulation time interval and predetermined time interval determine to as if static.
In certain embodiments, radio signal can comprise the infrared signal sent by destination object, the Wi-Fi signal launched by destination object and/or be launched by object tracking device and the light signal reflected by destination object.
Accompanying drawing explanation
Fig. 1 shows the exemplary multi-object environment according to embodiment.
Fig. 2 shows the example object tracking equipment calculating the distance of destination object according to the help of embodiment.
Fig. 3 A shows the exemplary signal received from destination object according to embodiment.
Fig. 3 B shows the exemplary signal from destination object reflection according to embodiment.
Fig. 4 shows the process flow diagram of the method for the distance for calculating destination object according to embodiment.
Fig. 5 shows the exemplary computer system of the distance calculating destination object according to the help of embodiment.
In the accompanying drawings, similar reference number represents identical figure elements.
Embodiment
Provide following description implement so that those skilled in the art can be made and use embodiment, and provide following description under the condition of application-specific and requirement thereof.The various amendments of disclosed embodiment to be will become apparent to those skilled in the art that and the General Principle limited herein can be applicable to other embodiments and application and do not deviate from spirit and scope of the present disclosure.Therefore, the invention is not restricted to illustrated embodiment, but expand to the most wide region meeting principle disclosed herein and feature.
general introduction
The embodiment provides a kind of object tracking device, which solve the problem of the accurate distance determining object near other, no matter and the sight line whether existed for destination object.Destination object can use transmitting set to launch radio frequency (RF) signal with clearly defined interval.Object tracking device can use radio receiver to detect these signal patterns, and determines the distance of destination object based on signal pattern.
Such as, the traffic signals in city etc. can be equipped with transmitting set, and automobile can scan to it degree of approach detecting them.In certain embodiments, traffic lights can when lamp is yellow or red transmitting RF signal.This configuration can reduce the quantity of the motor-vehicle accident of crossroad because automobile can when fast approaching traffic lights alerting driver.
In addition, because signal pattern is carried in radiofrequency signal, so the radio receiver of automobile can detection signal, even if when radio receiver does not have the direct sight line for transmitter.Usually, truck can stop immediately following the visuality at automobile thereafter.Therefore, installing these transmitting sets at traffic lights and stop sign place can help driver to avoid making a dash across the red light when rushing and driving after the amber light even truck of red light.
In certain embodiments, object tracking device can also detect the distance of other object tracking devices (being such as arranged on the equipment in other automobiles, motorcycle, bicycle or any other static or mobile object).Object tracking device can also use the signal pattern of detection to determine speed and the direction of other mobile objects.
Fig. 1 shows the exemplary multi-object environment 100 according to embodiment.Particularly, environment 100 can comprise automobile 104, and it can via the radio signal of being launched by other objects or from the infrared signal of object object reflection to calculate the distance of other objects various.Such as, automobile 104 can follow the tracks of other automobiles, and the distance of various object (automobile can be required to stop or giving precedence to) can be detected.Automobile 104 can comprise object tracking device 106, its can head for target object-oriented directional aerial to receive from the radio signal of destination object, and do not receive the signal from other not tracked objects.
In certain embodiments, automobile 104 can calculate the degree of approach of stationary objects (it can require automobile to stop or giving precedence to).Such as, the stationary objects of such as traffic lights 112 can comprise wireless station, and it is with aturegularaintervals broadcast radio signal 114.Object tracking device 106 can use signal 114 to determine the distance of traffic lights 112, even if when other objects can stop the direct sight line for traffic lights 112.Therefore, vehicle 104 accurately can calculate the distance of traffic lights 113, even if when truck or motorbus block the direct sight line between object tracking device 106 and traffic lights 112.
Radio signal 114 can comprise the information about traffic lights 112, the unique identifier of such as traffic lights 112, the state of traffic lights 112 or traffic lights 112 any other information distinctive.In addition, radio signal 114 can also comprise any information that automobile 104 can be used for the distance calculating traffic lights 112, such as the timestamp of radio signal, GPS (GPS) coordinate etc. of traffic lights 112.When the object tracking device 106 of automobile 104 receive radio signals 114 time, object tracking device 106 can calculate the distance of traffic lights 112 based on the gps coordinate of the timestamp of the time interval between two continuous signals, radio signal 114 and/or radio signal 114.
In addition, object tracking device 106 can calculate the distance of mobile object 116, no matter between automobile 104 and mobile object 116, whether there is direct sight line.Such as, mobile object 116 can comprise another automobile or motorcycle, its sight line for automobile 104 by buildings or another mobile object stop.The radio signal 120 that automobile 104 can be broadcasted via transmitter or the object tracking device 118 by mobile object 116 is to calculate the distance of mobile object 116.Object tracking device 118 can carry out broadcast radio signal 120 with aturegularaintervals, and object tracking device 106 can calculate the distance of mobile object 116 based on the time interval between two of a signal 120 continuous signal pattern, the timestamp of radio signal 120 and/or the gps coordinate of radio signal 120.Object tracking device 106 can also calculate the speed of mobile object 116 based on the continuous signal pattern of signal 120.This speed such as can comprise speed and the direction of mobile object 116.
In certain embodiments, object tracking device 106 can determine the distance of any other object (itself is broadcast radio signal not).Such as, some crossroads without traffic lights 112 can use traffic sign 102 (such as, stopping mark) to control to cross the wagon flow of crossroad.Automobile 104 can determine its exact position needing the road stopping or giving precedence to by the distance calculating traffic sign 102.In order to calculate this distance, object tracking device can launch the infrared signal 108 led towards traffic sign 102, and uses reflected signal 110 (reflecting from traffic sign 102) to calculate the distance of traffic sign 102.
Fig. 2 shows the example object tracking equipment 200 calculating the distance of destination object according to the help of embodiment.Object tracking device 200 can comprise multiple module, and they can intercom mutually via wireless communication.Object tracking device 200 can use one or more integrated circuit to realize, and can comprise than module less or more shown in Fig. 2.In addition, object tracking device 200 can be integrated in computer system, or be embodied as can with the autonomous device of other computer systems and/or devices communicating.Particularly, object tracking device 200 can comprise wireless signal transmitter 202, wireless signal receiver 204, directional aerial 206, antenna control gear 208, distance calculation structure 210 and rate calculations mechanism 212.
In certain embodiments, wireless signal transmitter 202 can launch radio frequency (RF) signal, such as Wi-Fi signal.In some other embodiments, wireless signal transmitter 202 can utilizing emitted light signal, such as infrared signal.Wireless signal receiver 204 can detect or receive by the wireless signal transmitter of destination object launch or from destination object reflect wireless RF or light signal.Directional aerial 206 can comprise Wave beam forming antenna or the wireless signal of input can be concentrated on any antenna of the signal that destination object is launched.Antenna control gear 208 can control the direction that directional aerial 206 leads, and it assembles the direction that receiver 204 therefrom receives wireless signal.
In addition, distance calculation structure 210 can calculate the distance of destination object based on the signal received from destination object, and rate calculations mechanism 212 can calculate speed and/or the direction of destination object based on the orientation of the signal received from destination object and directional aerial.
Fig. 3 A shows the exemplary signal received from destination object according to embodiment.During operation, destination object 302 can transmit 304,306 and 308 with predetermined time interval.Object tracking device 300 can head for target object 302 its local directional aerial directed, and determines the timestamp for each Received signal strength.In certain embodiments, each signal 304,306 and 308 comprises the information about destination object 302, and comprises the timestamp of destination object 302 wireless signal emission.In order to calculate the distance of destination object 302, first object tracking device 300 calculates the signal transmission time of signal 304 by calculating the difference between timestamp and the timestamp receiving signal 304 comprised in signal 304.Then, object tracking device 300 calculates the distance of destination object 302 by the predetermined speed (such as, the light velocity) being multiplied by wireless signal launch time.
Object tracking device 300 also calculates the speed of destination object 302 by the difference between determining from the signal reception time of the continuous signal of destination object 302.Such as, object tracking device 300 can determine the time interval between signal 304 and signal 306, and calculates the relative speed of destination object 302 based on Doppler effect.Relative speed is the speed of destination object 302 relative to the speed of object tracking device 300.
Fig. 3 B shows the exemplary signal reflected from destination object 352 according to embodiment.During operation, object tracking device 350 can transmit 354 by head for target object 352, and waits for the signal 356 reflected from destination object 352.In certain embodiments, signal 354 and 356 can comprise light signal, such as infrared signal.Object tracking device 350 by by the launch time of signal 354 stamp with the time of reception of signal 356 stamp between the time interval except 2 launch times determining signal 254.Then, motion tracking device 350 calculates the distance of destination object 352 by the predetermined speed (such as, the light velocity) being multiplied by wireless signal launch time.
In certain embodiments, motion tracking device 350 by reflecting from destination object 352 speed that another signal calculates destination object 352, thus can determine the renewal distance of destination object 352.Such as, equipment 350 can head for target object 352 transmit direction signal 358, and the time interval between the time of reception determining signal 358 and its reflected signal 360.Then, object tracking device 350 uses the new time interval to calculate the renewal distance of destination object 352, and by the distance change to destination object 352 to be calculated the relative speed of destination object 352 divided by the time interval between the first reflected signal 356 and the second reflected signal 260.
Fig. 4 shows the process flow diagram of the method 400 of the distance for calculating destination object according to embodiment.During operation, object tracking device can head for target Object Oriented OO directional aerial (such as, Wave beam forming antenna) (operation 402), and receives one or more signal pattern (operation 404) from the direction of destination object.These signal patterns can comprise the one or more RF signals (such as, Wi-Fi signal) launched by destination object, or can comprise the infrared signal of being launched by object tracking device or reflecting from destination object.
Then, equipment determines the time interval (operation 406) according to the signal pattern received, and calculates the distance (operation 408) of destination object based on time interval of pattern at least in part.Equipment by determining that the speed of native object tracking equipment calculates the absolute speed (operation 410) of destination object, and can also calculate the speed (operation 412) of destination object based on the time interval of signal pattern and the speed of object tracking device.
In certain embodiments, the speed of destination object can comprise its speed and direction thereof.If destination object does not move towards object tracking device or away from object tracking device, then object tracking device can need the orientation of adjustment direction antenna to carry out tracking target object.Object tracking device can change at the time interval of signal (intervals between two signals such as, launched by two destination objects of diverse location) period use angle, to calculate speed and the direction of destination object.
Such as, object tracking device can calculate the distance (using the first signal pattern) of the destination object being in a position, very fast (such as, after one second) calculates the distance (using secondary signal pattern) of the destination object being in another location.Native object tracking equipment can change based on the angle of the directional aerial between the distance and two positions of two positions the distance (and direction) calculating destination object and advance.Then, object tracking device can by calculating the speed of destination object divided by the time interval between the first signal pattern and secondary signal pattern by travel distance.
Fig. 5 shows the exemplary computer system 502 calculating the distance of destination object according to the help of embodiment.Computing system 502 can comprise processor 504, storer 506 and memory device 508.Storer 506 can comprise the volatile memory (such as, RAM) as diode-capacitor storage, and can be used for storing one or more storage pool.Computing system 502 can also comprise transmitting set 516, radio receiver 518 and directional aerial 520.Transmitting set 516 can launch radio frequency (RF) signal (such as, Wi-Fi signal), and radio receiver 518 can detect or receive the wireless RF of being launched by the transmitter of destination object.Directional aerial 520 can comprise Wave beam forming antenna or input wireless signal can be gathered in any antenna of the signal that destination object is launched.
In addition, computing system 502 can be coupled to display device 510, keyboard 512 and sensing equipment 514.Memory device 508 can store operating system 516, object-tracking systems 524 and data 532.Object-tracking systems 524 can comprise instruction, and computing system 502 can be made when instruction is performed by computing system 502 to perform method described by the disclosure and/or process.
Particularly, object-tracking systems 524 can comprise the instruction for controlling the direction that directional aerial 520 leads, and it assembles the direction (antenna control module 520) that receiver 518 receives wireless signal.In addition, object-tracking systems 524 can comprise the instruction (distance calculation module 522) of the distance for calculating destination object based on the signal received from destination object.Object-tracking systems 524 can also comprise the instruction (rate calculation module 524) in speed for calculating destination object based on the orientation of the signal received from this destination object and directional aerial and/or direction.
Data 526 can comprise by method described herein and/or processing requirements as input or any data of generating as output.
The data structure described in detail in instructions and code are stored on computer-readable recording medium usually, and it can for storing the code and/or any equipment of data or medium that computing system uses.Computer-readable recording medium includes but not limited to volatile memory, nonvolatile memory, magnetic and light storage device (such as disk drive, tape, CD (compact disk), DVD (data general-purpose dish or digital video disc)) or can store other media of computer-readable medium of known or following exploitation.
The method that instructions part is described in detail and process may be embodied as code and/or data, and it can be stored in above computer readable storage medium storing program for executing.When computing system reads and perform the code that is stored on computer-readable recording medium and/or data, computing system performs and is embodied as data structure and code and the method be stored in computer-readable recording medium and process.
In addition, said method and process can be included in hardware module.Such as, hardware module can include but not limited to other programmable logic devices of special IC (ASIC) chip, field programmable gate array (FPGA) and known or following exploitation.When starting hardware module, hardware module performs the method and process that are included in hardware module.
Only describe in order to the purpose of illustration and description provides before embodiments of the invention.They are not exclusiveness or limit the invention to disclosed form.Therefore, many modifications and variations it will be apparent to those skilled in the art that.In addition, disclosing and be not used in restriction the present invention above.Scope of the present invention is limited by claims.
Claims (22)
1. a computer implemented method, comprising:
The first radio signal pattern from the direction of destination object is received by object tracking device;
The time interval is determined according to received radio signal pattern;
Determine the speed of described object tracking device; And
By described object tracking device, based on the rate calculations of the described time interval and described object tracking device to the distance of described destination object.
2. method according to claim 1, also comprises: towards described destination object channeling direction antenna, to receive the radio signal pattern from described destination object.
3. method according to claim 1, wherein said radio signal pattern comprises the first signal pattern, and secondary signal pattern is followed after described first signal pattern; And
The wherein said time interval comprises the difference between the very first time stamp of described very first time pattern and the second timestamp of described secondary signal pattern.
4. method according to claim 1, wherein determines the described time interval according to the signal frequency of described radio signal pattern.
5. method according to claim 1, also comprises:
Calculate the speed of described destination object relative to the motion of described object tracking device.
6. method according to claim 1, also comprises:
Determine the regulation time interval of the motion showing described object tracking device; And
Based on calculate to described destination object Distance geometry described in regulation time interval calculate the absolute speed of described destination object.
7., according to the method that claim 6 is stated, wherein calculate described speed and comprise:
In response to described regulation time interval and predetermined time interval match determine described to as if static.
8. method according to claim 1, it is one or more that wherein said radio signal comprises in following signal:
The infrared signal of being launched by described destination object;
The Wi-Fi signal launched by described destination object; And
Launched by described object tracking device and the light signal reflected from described destination object.
9. store a non-transitory computer readable storage medium for instruction, make when being performed described instruction by computing machine the execution of described computing machine by the method for native object tracking equipment tracking target object, comprising:
Receive the first radio signal pattern from the direction of described destination object;
The time interval is determined according to received radio signal pattern;
Determine the speed of described object tracking device; And
Based on the rate calculations of the described time interval and described object tracking device to the distance of described destination object.
10. storage medium according to claim 9, also comprises: towards described destination object channeling direction antenna, to receive the radio signal pattern from described destination object.
11. storage mediums according to claim 9, wherein said radio signal pattern comprises the first signal pattern, and secondary signal pattern is followed after described first signal pattern; And
The wherein said time interval comprises the difference between the very first time stamp of described very first time pattern and the second timestamp of described secondary signal pattern.
12. storage mediums according to claim 9, wherein determine the described time interval according to the signal frequency of described radio signal pattern.
13. storage mediums according to claim 9, also comprise:
Calculate the speed of described destination object relative to the motion of described object tracking device.
14. storage mediums according to claim 9, also comprise:
Determine the regulation time interval of the motion showing described object tracking device; And
Based on calculate to described destination object Distance geometry described in regulation time interval calculate the absolute speed of described destination object.
15. storage mediums according to claim 9, it is one or more that wherein said radio signal comprises in following signal:
The infrared signal of being launched by described destination object;
The Wi-Fi signal launched by described destination object; And
Launched by described object tracking device and the light signal reflected from described destination object.
16. 1 kinds of Object tracking devices for tracking target object, described computer system comprises:
Radio receiver, for receiving the first radio signal pattern in the direction from described destination object; And
Distance calculation module, for:
The time interval is determined according to received radio signal pattern;
Determine the speed of described Object tracking device; With
Based on the rate calculations of the described time interval and described Object tracking device to the distance of described destination object.
17. Object tracking devices according to claim 16, wherein said Object tracking device also comprises:
Directional aerial; And
Antenna control module, for guiding described directional aerial towards described destination object, to receive the radio signal pattern from described destination object.
18. Object tracking devices according to claim 16, wherein said radio signal pattern comprises the first signal pattern, and secondary signal pattern is followed after described first signal pattern; And
The wherein said time interval comprises the difference between the very first time stamp of described first signal pattern and the second timestamp of described secondary signal pattern.
19. Object tracking devices according to claim 16, wherein said distance calculation module determines the described time interval according to the signal frequency of described radio signal pattern.
20. Object tracking devices according to claim 16, also comprise:
Rate calculation module, is configured to calculate the speed of described destination object relative to the motion of described Object tracking device.
21. Object tracking devices according to claim 16, also comprise rate calculation module, are configured to:
Determine the regulation time interval of the motion that described Object tracking device is described; And
Based on calculate to described destination object Distance geometry described in regulation time interval calculate the absolute speed of described destination object.
22. Object tracking devices according to claim 16, it is one or more that wherein said radio signal comprises in following signal:
The infrared signal of being launched by described destination object;
The Wi-Fi signal launched by described destination object; And
Launched by described object tracking device and the light signal reflected from described destination object.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201462042722P | 2014-08-27 | 2014-08-27 | |
| US62/042,722 | 2014-08-27 | ||
| US14/790,776 | 2015-07-02 | ||
| US14/790,776 US20160377709A1 (en) | 2014-08-27 | 2015-07-02 | Determining an object distance using radio frequency signals |
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| CN105572659A true CN105572659A (en) | 2016-05-11 |
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| CN201510530617.9A Pending CN105572659A (en) | 2014-08-27 | 2015-08-26 | Use of radio frequency signals to determine the distance of an object |
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| CN108337636A (en) * | 2017-08-02 | 2018-07-27 | 福州市协成智慧科技有限公司 | Equipment displacement prompting system and method in a kind of LAN |
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