CN106199738A - There is detection device and method in object - Google Patents
There is detection device and method in object Download PDFInfo
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- CN106199738A CN106199738A CN201510338535.4A CN201510338535A CN106199738A CN 106199738 A CN106199738 A CN 106199738A CN 201510338535 A CN201510338535 A CN 201510338535A CN 106199738 A CN106199738 A CN 106199738A
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Abstract
The present invention relates to a kind of object and there are detection apparatus and method, this device includes: a UWB transceiver, including a transmitting terminal and a receiving terminal, is used for sending and receive UWB pulse signal；One time label unit, the time that predetermined pulse signal is reflected back to this pulse signal and is arrived by this UWB transceiver is sent for recording this UWB transceiver, wherein, in the presence of without object, its receiving terminal receives several and is reflected the UWB pulse signal returned more through surrounding, UWB pulse is designated as Tm through the shortest flight time being reflected path one more, in the presence of having detected whether object, the UWB pulse signal that this UWB transceiver sends returns to the receiving terminal of UWB transceiver, UWB pulse is designated as Tn through the flight time of a shortest reflection path；And an identifying unit, it is used for comparing Tn and Tm, as Tn ＜ Tm, it is determined that there are object near this UWB transceiver, otherwise, without object existence near this UWB transceiver.
Description
Technical field
The present invention relates to a kind of object and there is detection technique, particularly relate to one and utilize UWB technology judgment object
The method and apparatus whether existed.
Background technology
At present, along with technology of Internet of things is applied in commercial production and people's lives more and more, information passes
Sense technology seems more and more important as an important step in technology of Internet of things.At a lot of Internet of things system
In be required for the existence of object being detected, including people, car, thing etc..Such as at the elevator of market pair
The detection of pedestrian, state-detection to all parking stalls in an automated parking ground, and industry from
The detection etc. to raw material position of the dynamicization field.
The Detection of Existence method of object has a variety of, such as supercritical ultrasonics technology, rpyroelectric infrared method, Doppler
Microwave radar, active infrared detection, terrestrial magnetic disturbance detection method etc..These detection methods all obtain in every field
Arrive application, but each to there is also intrinsic defect, such as supercritical ultrasonics technology be by measuring target object for it
Distance change judgment object exist, but penetration capacity is poor；Rpyroelectric infrared method is by detection variations in temperature
Cause heat radiation to carry out detecting object to exist, constant temperature object be cannot respond to；Doppler microwave radar can only be visited
Survey mobile object, stationary body cannot be detected；The active infrared detection reflection detecting object by infrared light
Existence, but owing to being easily contaminated and its application scenario of limit value；Terrestrial magnetic disturbance detection method has merit
Consume low a little, but it is only used for the detection of metal object.
Summary of the invention
One of the object of the invention is to provide a kind of object to there is detection method, utilizes object to UWB signal
Block effect, thus cause the transmission path of UWB signal pulse to change, by sighting distance linear transmission by thing
Body blocks and becomes relying on surrounding to be reflected transmission more, thus adds UWB pulse short transmission path
Length, by judging the increase of UWB pulse minimum flight time, it is determined that the existence of object；Or utilize and deposit
It is UWB transceiver object reflection nearby, thus UWB transceiver can receive flight path
It is reflected, than surrounding, the reflected signal that path is shorter, by judging UWB transceiver receiving end and making a start more
The reduction of UWB pulse minimum flight time, it is determined that the existence of object.
Another object of the present invention is the detection device providing this object of execution to there is detection method.
The present invention provides a kind of object to there is detection device, including: at least one pair of spaced certain distance
UWB transceiver, each UWB transceiver all includes a transmitting terminal and a receiving terminal, is used for sending and receiving
UWB pulse signal；One time label unit, for recording pulse signal between every pair of UWB transceiver
Flight time, wherein, the flight time of this pulse signal refers to the predetermined arteries and veins that wherein a UWB transceiver sends
Rush the time that signal is arrived by another UWB transceiver, and this is deposited without object between UWB transceiver
Time pulse signal flight time be designated as T0, will during detection this to UWB between UWB transceiver
The flight time of pulse signal is designated as Tx；One identifying unit, is used for comparing Tx and T0, as Tx ＞ T0,
Judging that this there are object between UWB transceiver, otherwise, this is deposited without object between UWB transceiver
?.
Concrete, this Tx includes two kinds of forms, and one form of which is that this is to UWB between UWB transceiver
Pulse is through the shortest many flight time T1 arriving receiving terminal through transmission path, and another kind of form is UWB arteries and veins
Rush the flight time T2 arriving receiving terminal through the shortest transmission path.
The present invention reoffers a kind of object and there is detection method, comprising: step 1, sets in predetermined detection position
Put the UWB transceiver of at least one pair of spaced certain distance, and record this to nothing between UWB transceiver
The predetermined pulse signal that in the presence of object, a UWB transceiver sends by another UWB transceiver arrive time
Between T0；Step 2, interval records this and sends out a UWB transceiver between UWB transceiver to schedule
The time Tx that the predetermined pulse signal gone out is arrived by another UWB transceiver；Step 3, it is judged that this is to UWB
Whether object is there is, it is judged that method includes comparing this Tx and T0, as Tx ＞ T0 between transceiver, it is determined that
This there are object between UWB transceiver, and otherwise, this exists without object between UWB transceiver.
Preferably, this Tx includes two kinds of forms, and one form of which is that this is to UWB between UWB transceiver
Pulse is through the shortest many flight time T1 arriving receiving terminal through transmission path, and another kind of form is UWB arteries and veins
Rush the flight time T2 arriving receiving terminal through the shortest transmission path.
Due to UWB pulse transmit in the environment it is possible that transmission or by environment other objects reflection and
Exist many through transmission effects, the UWB pulse that recipient is received except linear transmission, the also time of advent
The pulse through other object transmission or reflections a little later.These arrive the arteries and veins of receiver through being too much reflected
Punching, owing to its flight path is longer than air line distance, and UWB pulse flight speed (for the light velocity) is constant, because of
This UWB pulse time-of-flight being reflected arrival recipient through environment always big than T0 more, UWB arteries and veins
Rush through all these propagation times being reflected a paths the shortest in path is T1 more, by judging
The UWB pulse flight time T1 through short transmission path is more than T0, i.e. can determine that object exists；For
Through testee through transmission arrive recipient UWB signal, due to usual medium dielectric constant all than
Vacuum wants big, and the dielectric constant of air and vacuum approximately equal, UWB signal spread speed in atmosphere is wanted
Faster than the Propagation speed in equal length, therefore the UWB signal through transmission arrives flying of recipient
The row time is also big than T0, and UWB pulse is T2 through the propagation time of the shortest transmission path, by judging
The UWB pulse flight time T2 through short transmission path is more than T0, i.e. can determine that object exists.Therefore,
It is present in the straight line sighting distance blocking between transceiver between (wherein) two UWB signal transceivers when there being object
During transmission, the UWB signal that transmitter sends can be passed through because of the existence of object to be reflected more or transmission mode arrives
Reach recipient.During by judging the UWB signal minimum flight time between transceiver and sighting distance linear transmission
Between the difference of T0, it can be determined that identify the existence of object.
There is detection device in a kind of object that the present invention also provides for, including: a UWB transceiver, including one
Penetrate end and a receiving terminal, be used for sending and receive UWB pulse signal；One time label unit, for record
This UWB transceiver sends predetermined pulse signal and is reflected back to this pulse signal and by this UWB transceiver
The time received, wherein, in the presence of without object, it is many through surrounding that its receiving terminal receives several
Being reflected the UWB pulse signal returned, UWB pulse is reflected path through the shortest one more
Flight time is designated as Tm, in the presence of having detected whether object, and the UWB arteries and veins that this UWB transceiver sends
Rushing signal and return to the receiving terminal of UWB transceiver, UWB pulse is through the flight of a shortest reflection path
Time is designated as Tn；And an identifying unit, it is used for comparing Tn and Tm, as Tn ＜ Tm, it is determined that this UWB
There are object near transceiver, otherwise, exist without object near this UWB transceiver.
The present invention reoffers a kind of object and there is detection method, including: step one, a UWB transceiver is set,
Measuring UWB pulse in the presence of not having object in surrounding in advance to be reflected one through the shortest more
The flight time Tm in path；Step 2, interval records what this UWB transceiver sent to schedule
UWB pulse signal returns to during the receiving terminal of UWB transceiver this UWB pulse signal through the shortest one
The flight time Tn of reflection path；And step 3, it is judged that whether there is object near this UWB transceiver,
Determination methods includes comparing this Tn and Tm, as Tn ＜ Tm, it is determined that there are near this UWB transceiver
Object, otherwise, exists without object near this UWB transceiver.
The principle of the method is: when there being object to be present in UWB transceiver vicinity, UWB transceiver sends
Signal can be reflected by the object, the UWB signal flight path that object reflects is compared by environment
It is reflected path short, the flight time Tn ratio of the UWB signal pulse therefore reflected through object more
Do not have the signal pulse minimum flight time Tm in the presence of object little, the Tn less than Tm by judging existence,
Thus judge the existence of object.
Application to UWB technology in prior art, is mainly used in pinpoint field, and is being accurately positioned
In the application of technology, it is the shortest flight time utilizing UWB pulse, many warps of UWB during being therefore somebody's turn to do
Reflection path transmission produces interference effect to the application of placement technology, it is therefore desirable to avoids as far as possible and eliminates,
It is to say, in the conventional application of UWB, what technical staff always attempted to eliminate UWB is reflected road more
Footpath is transmitted, and attempts utilizing the path transmission that is reflected of UWB in the present invention, by recording this UWB more
The path transmission time that is reflected more and compare with the shortest flight time, thus for judging UWB transmitting-receiving
Whether with the presence of object near machine or between a pair UWB transceiver, and this UWB technology looked for another way
Application, have the advantages that
UWB signal has very bandwidth width, pulse width is the narrowest, energy density is low, spatial resolution is high consolidates
There is feature, actual environment is laid one or more UWB transceiver, first, in Project Realization,
UWB is more simply too much than other wireless technology, can total digitalization realize, it is only necessary to produce with a kind of mathematical way
Raw pulse, and pulses generation is modulated, and these circuit can be integrated on a chip, equipment
Cost will be the lowest, and there is detection method additionally, due to this object is the flight time by judging UWB pulse
Judge object presence or absence, therefore, it is possible to carry out there is judgement to the either statically or dynamically object of any material；UWB
Signal can be transmitted through cabinet, facilitates the system integration and installs and uses, by external influence factor
Little；Owing to UWB signal energy density is the lowest, almost suitable with environment noise, therefore they are several to surrounding
Noiseless impact.
Accompanying drawing explanation
The object that Fig. 1 provides for a preferred embodiment of the present invention exist detection two UWB transceiver of device it
Between without detection object time fundamental diagram.
Fundamental diagram when Fig. 2 is to have detection object in Fig. 1 between two UWB transceivers.
The object that Fig. 3 provides for second embodiment of the invention exist detection device use a UWB transceiver and
Without fundamental diagram during detection object near it.
Fundamental diagram when Fig. 4 is to have detection object in Fig. 3 near a UWB transceiver.
Fig. 5 is the workflow diagram that the present invention uses that two UWB transceiver detection objects exist.
Fig. 6 is the workflow diagram that the present invention uses that a UWB transceiver detection object exists.
Specific embodiment
Object provided by the present invention exists detection apparatus and method below in conjunction with the accompanying drawings be described further,
It is pointed out that below the most only with a kind of optimized technical scheme to technical scheme and design
Principle is described in detail.
There is detection device in the object that a preferred embodiment of the present invention provides, including: a pair UWB transceiver,
Each UWB transceiver all includes a transmitting terminal and a receiving terminal, is used for sending and receive UWB pulse signal；
One time label unit, for recording the flight time of pulse signal between every pair of UWB transceiver, wherein,
The flight time of this pulse signal refers to that predetermined pulse signal that wherein a UWB transceiver sends is by another
The time that UWB transceiver arrives, and by this between UWB transceiver without pulse signal in the presence of object
Flight time be designated as T0, will detection during UWB pulse signal between UWB transceiver is flown by this
The row time is designated as Tx；One identifying unit, is used for comparing Tx and T0, as Tx ＞ T0, it is determined that this is to UWB
There are object between transceiver, otherwise, this exists without object between UWB transceiver.
As it is shown in figure 1, there is detection device by phase between two UWB transceivers 101 and 102 in this object
Transmitting-receiving UWB pulse signal mutually, the UWB pulse that wherein a side sends can pass through sighting distance straight propagation paths
103 are received by the opposing party, it is also possible to by the reverberation 105,106 in surrounding through being too much reflected
Propagation path 104 and received by the opposing party.In institute's likely propagation path of UWB pulse, two UWB
Sighting distance straight propagation paths 103 between transceiver is shortest path, and UWB pulse flies through path 103
The row time is T0, it is clear that T0 is the UWB pulse flight time minima through all paths.
With reference to Fig. 2, according to the description with reference to Fig. 1, it is present in UWB transceiver 101 He when there being object 107
When having blocked its sighting distance straight propagation paths 103 between 102, a kind of situation is that UWB pulse cannot pass thing
Body 107 material generation transmission, then the UWB pulse that one of them UWB transceiver sends will pass through surrounding
How the reverberation of environment is by arriving receiving terminal through propagation path 104, it is assumed that UWB pulse is through the shortest
The flight time in one paths path 1044 is minimum flight time T1, owing to how to compare through propagation path 1044
Straight line path 103 is long, and UWB pulse is in atmosphere with light velocity propagation, therefore by judging that UWB pulse is
Little flight time T1 is more than T0, it is determined that have object to block straight propagation paths, i.e. object exists；Another
The situation of kind is that UWB pulse there occurs transmission propagation path 1033 through testee, one of them UWB
The UWB pulse that transceiver sends arrives the flight of receiving terminal through the shortest transmission path 1033
Between be minimum flight time T2, due to the dielectric constant of UWB pulse spread speed in media as well Yu medium
Relevant.According to formula v=(λ/ε) * f, f is signal frequency, and λ is signal wavelength, and ε is Jie of transmission medium
Electric constant, v is spread speed.Owing to the dielectric constant of any object is all big than vacuum, and air and vacuum
Dielectric constant approximately equal, the dielectric constant of general object is all big than air, so UWB pulse is through object
The spread speed of 107 internal transmission transmission paths 1033 is less than its aerial spread speed, therefore,
By judging that UWB pulse propagates flight minimum time T2 more than T0 through transmission path, it is determined that there is object to hide
Kept off straight propagation paths, i.e. object exists.
With reference to Fig. 5, the detection method that two UWB transceiver detection objects of this employing exist comprises the following steps:
Step 1, arranges at least one pair of UWB transceiver, and records this to UWB receipts in predetermined detection position
Send out the predetermined pulse signal sent without a UWB transceiver in the presence of object between machine by another UWB transceiver
The time T0 received, namely by keeping sighting distance state, two transmitting-receivings between two UWB transceivers
Between machine the most mutually propagate UWB pulse signal, record UWB pulse two transceivers it
Between flight time T0；
Step 2, interval records this and sends a UWB transceiver between UWB transceiver to schedule
The time Tx that arrived by another UWB transceiver of predetermined pulse signal；This Tx includes two kinds of forms, its
Middle a kind of form is how this arrives reception through transmission path to UWB pulse between UWB transceiver through the shortest
The flight time T1 of end, another kind of form is that UWB pulse arrives flying of receiving terminal through the shortest transmission path
Row time T2；And
Step 3, it is judged that whether this exists object between UWB transceiver, it is judged that method includes comparing this
Tx and T0, as Tx ＞ T0, it is determined that this there are object between UWB transceiver, and otherwise, this is right
Exist without object between UWB transceiver.
UWB pulse pulse time-of-flight T0 of straight line line-of-sight propagation between two UWB transceivers is it
The propagation time minima of likely propagation path.Therefore, if T1 is not more than T0, then it is only possible to T1=T0,
Show that UWB pulse is still propagated between two UWB transceivers in straight line sighting distance mode, it is determined that without object
Exist.Minima T1 if there is UWB pulse time-of-flight T is bigger, then than rectilinear flight time T0
In two kinds of situation, a kind of situation is that UWB pulse straight propagation paths is blocked, and causes UWB pulse to be passed through
Surrounding be reflected arrival receiver more, how pass through than straight line path path length, UWB pulse through transmission path
The shortest time more than one through transmission path is all many minima T1 through transmitting path time, i.e.
T1 ＞ T0；Another kind of situation is that UWB pulse have passed through certain section of transmission path, UWB arteries and veins between transceiver
The spread speed being punched in transmission path is more medium and small than air, causes T1 ＞ T0.Both of these case can determine that at two
The opinion of UWB transceiver is with the presence of object.
It should be noted that detection to pedestrian at the elevator of market, or right in an automated parking ground
The state-detection on parking stall, or at industrial automation in the applications such as the detection of raw material position,
The object that the present embodiment provides exists and often records a Tx in detection method step 2, then perform step 3 once,
And after execution of step 3, return to step 2, the Tx next time after record predetermined time interval, hold the most again
Row step 3, the most constantly performs step 2 and step 3, can monitor whether predetermined detection position has in real time
Object (including people) exists.Fig. 5 represents a single process during monitoring in real time.
There is detection device in a kind of object that second embodiment of the invention provides, including: a UWB transceiver,
Including a transmitting terminal and a receiving terminal, it is used for sending and receive UWB pulse signal；One time label unit,
Send predetermined pulse signal be reflected back and by this to this pulse signal for recording this UWB transceiver
The time that UWB transceiver arrives, wherein, in the presence of without object, its receiving terminal receives several and passes through
Surrounding is reflected the UWB pulse signal returned more, and UWB pulse is through the shortest warp more than
The flight time of reflection path is designated as Tm, and in the presence of having detected whether object, this UWB transceiver sends
UWB pulse signal return to the receiving terminal of UWB transceiver, UWB pulse is through a shortest reflection
The flight time in path is designated as Tn；And an identifying unit, it is used for comparing Tn and Tm, as Tn ＜ Tm,
Judge to there are object near this UWB transceiver, otherwise, exist without object near this UWB transceiver.
With reference to Fig. 3, there is detection device by a UWB transceiver 201 in the object that this second embodiment provides
Launching and receive UWB pulse signal, UWB launches pulse and occurs through surrounding reverberation 201,203
How through transmission 204, the UWB pulse that UWB transceiver 201 is launched is through too much arriving through transmission path 204
The pulse time-of-flight minima of UWB transceiver 201 receiving terminal is Tm；In addition, UWB pulse is also
Being likely to occur areflexia or the transmission path 205 of the most weak situation of reflected signal, UWB pulse is through propagating road
Transmitting-receiving time interval Tm in footpath 205 tends to infinitely great.
With reference to Fig. 4, according to the description with reference to Fig. 3, when there being object 206 to be present near UWB transceiver,
UWB launches pulse and will be reflected by object 206 and produce transmission path 207, owing to object 206 is in UWB
Near transceiver 201, UWB pulse is through transmission path 207 warp more than other surroundings that object reflects
Transmission path 204 is short, and the propagation time Tn through path 207 is less than Tm in UWB pulse, therefore,
By judging one Tn ＜ Tm of existence, it is determined that near object and UWB transceiver.
With reference to Fig. 6, the detection method that one UWB transceiver detection object of this employing exists comprises the following steps:
Step one, arranges a UWB transceiver, measures in surrounding in advance and do not have UWB in the presence of object
Pulse through the shortest flight time Tm being reflected path one more；It is to say, exist by one
Individual UWB transceiver and reception UWB pulse, after UWB impulse ejection, many through transmission through environment,
The flight time T that UWB pulse through different paths arrives receiver is different, wherein UWB pulse warp
The flight time crossing a shortest paths is Tm；
Step 2, interval records the UWB pulse signal that this UWB transceiver sends and returns to schedule
During the receiving terminal of UWB transceiver, this UWB pulse signal is through the flight time of a shortest reflection path
Tn；Namely calculate minima Tn of time interval T of UWB transceiver and reception pulse, and sentence
Whether disconnected Tn is less than Tm；And
Step 3, it is judged that whether there is object near this UWB transceiver, it is judged that method includes comparing this Tn
With Tm, as Tn ＜ Tm, it is determined that there are object near this UWB transceiver, otherwise, this UWB receives
Without object near the machine of sending out.
UWB pulse in known environment many through transmission time Tn do not have foreign body intervene in the case of,
Holding is bigger than Tm, its minima Tn=Tm.Therefore, by judging that Tn is not less than Tm, it is determined that known
Environment do not has object near UWB transceiver.If there is UWB pulse time-of-flight ratio through ring
The time Tm in short transmission path known in border is little, it is possible to determine that there is shorter reflection path in environment,
UWB pulse is through the flight time Tn ＜ Tm in this path, it is determined that with the presence of object near UWB transceiver.
Same, the object that the present embodiment provides exists in detection method, and step 2 often records a Tn, then
Perform step 3 once, and after execution of step 3, return to step 2, next after record predetermined time interval
Secondary Tn, performs step 3 the most again, the most constantly performs step 2 and step 3, can monitor predetermined in real time
Whether detection position has object (including people) to exist.During also main expression monitors in real time in Fig. 6 one
Individual single process.
The present invention is that a kind of object based on UWB exists detection method, utilizes the existence pair of object to be detected
The impact of UWB pulse propagation path between transceiver, thus cause the difference in propagation time to judge thing
The existence of body.
Below it is only the preferred embodiment of the present invention, it is noted that above-mentioned preferred implementation should not
Being considered as limitation of the present invention, protection scope of the present invention should be as the criterion with claim limited range.
For those skilled in the art, without departing from the spirit and scope of the present invention, also may be used
To make some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (6)
1. there is a detection device in object, including:
The UWB transceiver of at least one pair of spaced certain distance, each UWB transceiver all includes one
Penetrate end and a receiving terminal, be used for sending and receive UWB pulse signal；
One time label unit, for recording the flight time of pulse signal between every pair of UWB transceiver, its
In, the flight time of this pulse signal refers to that predetermined pulse signal that wherein a UWB transceiver sends is by another
The time that UWB transceiver arrives, and by this between UWB transceiver without pulse signal in the presence of object
Flight time be designated as T0, will detection during UWB pulse signal between UWB transceiver is flown by this
The row time is designated as Tx；And
One identifying unit, is used for comparing Tx and T0, as Tx ＞ T0, it is determined that this to UWB transceiver it
Between there are object, otherwise, it is determined that this between UWB transceiver without object exist.
2. there is detection device in object as claimed in claim 1, it is characterised in that this Tx includes two kinds of forms,
One form of which is how UWB pulse between UWB transceiver is connect through the arrival of transmission path by this through the shortest
The flight time T1 of receiving end, another kind of form is that UWB pulse arrives receiving terminal through the shortest transmission path
Flight time T2.
3. there is a detection method in object, comprising:
Step 1, arranges the UWB transceiver of at least one pair of spaced certain distance in predetermined detection position,
And record this predetermined pulse signal to sending between UWB transceiver without a UWB transceiver in the presence of object
The time T0 arrived by another UWB transceiver；
Step 2, interval records this and sends a UWB transceiver between UWB transceiver to schedule
The time Tx that arrived by another UWB transceiver of predetermined pulse signal；And
Step 3, it is judged that whether this exists object between UWB transceiver, it is judged that method includes comparing this
Tx and T0, as Tx ＞ T0, it is determined that this there are object between UWB transceiver, otherwise, it is determined that should
Exist without object between UWB transceiver.
4. there is detection method in object as claimed in claim 3, it is characterised in that this Tx includes two kinds of forms,
One form of which is how UWB pulse between UWB transceiver is connect through the arrival of transmission path by this through the shortest
The flight time T1 of receiving end, another kind of form is that UWB pulse arrives receiving terminal through the shortest transmission path
Flight time T2.
5. there is a detection device in object, including:
One UWB transceiver, including a transmitting terminal and a receiving terminal, is used for sending and receive UWB pulse signal；
One time label unit, is used for recording this UWB transceiver and sends predetermined pulse signal to this pulse signal quilt
The time reflected and arrived by this UWB transceiver, wherein, in the presence of without object, its receiving terminal
Receiving several and be reflected the UWB pulse signal returned more through surrounding, UWB pulse is through wherein
The shortest flight time being reflected path one is designated as Tm more, in the presence of having detected whether object, and should
The UWB pulse signal that UWB transceiver sends returns to the receiving terminal of UWB transceiver, and UWB pulse is passed through
The flight time of a shortest reflection path is designated as Tn；And
One identifying unit, is used for comparing Tn and Tm, as Tn ＜ Tm, it is determined that deposit near this UWB transceiver
There iing object, otherwise, it is determined that exist without object near this UWB transceiver.
6. there is a detection method in object, including:
Step one, arranges a UWB transceiver, does not has UWB in the presence of object in pre-recorded surrounding
Pulse through the shortest flight time Tm being reflected path one more；
Step 2, interval records the UWB pulse signal that this UWB transceiver sends and returns to schedule
During the receiving terminal of UWB transceiver, this UWB pulse signal is through the flight of a shortest reflection path
Time Tn；And
Step 3, it is judged that whether there is object near this UWB transceiver, it is judged that method includes comparing this Tn
With Tm, as Tn ＜ Tm, it is determined that there are object near this UWB transceiver, otherwise, this UWB
Exist without object near transceiver.
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| CN201510090616 | 2015-02-15 | ||
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106886036A (en) * | 2017-02-24 | 2017-06-23 | 广东小天才科技有限公司 | A kind of method of locating terminal and device |
| WO2020052652A1 (en) * | 2018-09-15 | 2020-03-19 | Beijing Youshan Information Technology Co., Ltd. | Systems and methods for vehicle management |
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