CN104678352A - Electromagnetic signal transmitting method, method for realizing distance measurement and terminal - Google Patents
Electromagnetic signal transmitting method, method for realizing distance measurement and terminal Download PDFInfo
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- CN104678352A CN104678352A CN201310628329.8A CN201310628329A CN104678352A CN 104678352 A CN104678352 A CN 104678352A CN 201310628329 A CN201310628329 A CN 201310628329A CN 104678352 A CN104678352 A CN 104678352A
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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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Abstract
The invention discloses an electromagnetic signal transmitting method, a method for realizing distance measurement and a terminal. The electromagnetic signal transmitting method comprises the steps that a first terminal selects a frequency from preset n available frequencies, wherein n is positive integer larger than or equivalent to 2, and transmits electromagnetic signals outwards by adopting the selected frequency, wherein the n available frequencies satisfy the condition that the electromagnetic signals transmitted at the n available frequencies can be used for measuring a continuous target distance in a preset range; the first terminal judges whether the electromagnetic signals need to be retransmitted or not according to the response situation of the opposite end, and if so, selects another frequency from the n available frequencies to retransmit the electromagnetic signals outwards till the first terminal judges that the electromagnetic signals do not need to be retransmitted according to the response situation of the opposite end. By adopting the technical scheme, the invention solves the problem that the positioning accuracy is not high enough in the prior art, especially under indoor environments.
Description
Technical field
The present invention relates to electronic device field, particularly relate to a kind of electromagnetic signal transmitting method, the method realizing range finding and terminal.
Background technology
Along with improving constantly of scientific and technological level, be accurately positioned at daily productive life in real time reliably more and more important, various localization method and equipment are widely used.The market of real-time location is also more and more huger, and such as, real-time tracing assets stock in industrial automotive field, effectively raises search efficiency, decrease the waste of resource; Troop's match can be noted down in sports field in real time live, analytic record is accurately carried out to games results; Logistics field can utilize reader to carry out real-time tracing to goods or vehicle, and effectively reduce the link that insurance is verified, storehouse management also becomes more flexible; Military field can realize personnel, the real-time location tracking of equipment; Can locate a people and supplies in hazardous environment, realize home and promptly search for, personnel monitor in real time, improve safety and efficiency; Medical health field can real-time tracking of patients, effectively looks after and manage patient.
The Method and Technology that current realization is located in real time is many, and wherein main technique methods has following several.
TDOA (Time Difference of Arrival) technology, the mistiming being arrived two base stations by detection signal realizes location, and this technology is widely used in the architecture in GPS location, mobile communication system.
RSSI(Received Signal Strength Indication) technology, by the distance of the strong and weak measured signal launching site of the signal that receives with acceptance point, this technology is widely used in during 802.11 WLAN (wireless local area network) location and wireless sensor network locate.
AOA (Angle Of Arrival) technology, this technology, at plural location point setting party tropism receiving antenna or receiving array antenna, obtains the radio wave signal angle information of terminal transmission, is then estimated the position of terminal by Convergence method.
Above locator meams is comparatively large by building defilade, weather conditions and satellite signals disturbing effect, and should not use in indoor or enclosed environment, especially under the large-scale indoor environment of people's stream aggregation, communication conditions is severe, and positioning function is difficult to realize.
How to realize accurate location, especially indoor positioning is the anxious technical issues that need to address.
Summary of the invention
The invention provides a kind of electromagnetic signal transmitting method, the method realizing range finding and terminal, solve the accurate not problem of targeting scheme in prior art, especially under indoor environment.
For solving the problems of the technologies described above, the present invention by the following technical solutions:
A kind of electromagnetic signal transmitting method, comprises the following steps:
First terminal selects a frequency from n the usable frequency preset, n be more than or equal to 2 positive integer, and the outside transmission of electromagnetic signals of frequency selected by adopting, a described n usable frequency meets the following conditions: the electromagnetic signal of described n usable frequency transmitting can be used for finding range to continuous print target range in preset range;
First terminal judges whether to need to retransmit electromagnetic signal according to the response condition of opposite end, from a described n usable frequency, if so, then select another frequency outside transmission of electromagnetic signals again; Till be judged as not needing to retransmit electromagnetic signal according to the response condition of opposite end.
Further, the adjacent two available frequency f of a described n usable frequency according to frequency after descending or ascending sequence
x-1, f
xmeet the following conditions, suppose f
x-1<f
x: 0.3 λ
x>=0.08 λ
x-1; Wherein, λ
x=C/f
x, C is the light velocity; 1<x≤n, and x is positive integer.
Further, according to the response condition of opposite end, first terminal judges whether that needing to retransmit electromagnetic signal comprises:
Receive the response signal of opposite end feedback, described response signal carries that opposite end is determined according to the electromagnetic signal received and between first terminal distance d
x;
Judge this distance d
xwhether meet the following conditions: 0.08 λ
x≤ d
x≤ 0.3 λ
x, suppose f
xfor the transmission frequency of this electromagnetic signal; If meet, be then judged as not needing to retransmit electromagnetic signal;
If d
x<0.08 λ
x, then select from a described n usable frequency another frequency again outwards transmission of electromagnetic signals be specially: Selection radio f from a described n usable frequency
xanother higher frequency is outside transmission of electromagnetic signals again;
If d
x> 0.3 λ
x, then select from a described n usable frequency another frequency again outwards transmission of electromagnetic signals be specially: Selection radio f from a described n usable frequency
xanother lower frequency is outside transmission of electromagnetic signals again.
Realize a method of finding range, comprise the following steps:
Step one, the second terminal receive the electromagnetic signal that opposite end is launched;
Step 2, the second terminal determine the distance d between itself and opposite end according to the electromagnetic signal received
x;
Step 3, this distance d of the second terminal judges
xwhether at the transmission frequency f of this electromagnetic signal
xwithin corresponding effective finding range, if not, then feed back corresponding response signal to opposite equip., response signal is used to indicate opposite equip. and selects another frequency outside transmission of electromagnetic signals again, and returns step one.
Further, this distance d of the second terminal judges
xwhether at the transmission frequency f of this electromagnetic signal
xcomprise within corresponding effective finding range:
Judge this distance d
xwhether meet: 0.08 λ
x≤ d
x≤ 0.3 λ
x, wherein, λ
x=C/f
x, C is the light velocity; If meet, be then judged as not needing to retransmit electromagnetic signal;
If d
x<0.08 λ
x, then described response signal is used to indicate opposite equip. Selection radio f
xanother higher frequency is outside transmission of electromagnetic signals again;
If d
x> 0.3 λ
x, then described response signal is used to indicate opposite equip. Selection radio f
xanother lower frequency is outside transmission of electromagnetic signals again.
A kind of terminal, comprising:
Frequency-selecting module, for selecting a frequency configuration to the first transmitter module from n the usable frequency preset, n be more than or equal to 2 positive integer, a described n usable frequency meets the following conditions: the electromagnetic signal that described n usable frequency is launched can be used for finding range to continuous print target range in preset range; Also for when the judged result of the first judge module retransmits electromagnetic signal for needs, from a described n usable frequency, select another frequency configuration to the first transmitter module; Till the judged result of the first judge module is do not need to retransmit electromagnetic signal;
First transmitter module, for adopting the outside transmission of electromagnetic signals of the frequency selected by frequency-selecting module;
First receiver module, for receiving the response signal of opposite end feedback;
First judge module, needs to retransmit electromagnetic signal for judging whether according to the response condition of opposite end.
Further, the adjacent two available frequency f of a described n usable frequency according to frequency after descending or ascending sequence
x-1, f
xmeet the following conditions, suppose f
x-1<f
x: 0.3 λ
x>=0.08 λ
x-1; Wherein, λ
x=C/f
x, C is the light velocity; 1<x≤n, and x is positive integer.
Further, described response signal carries that opposite end is determined according to the electromagnetic signal received and between described terminal distance d
x, the first judge module is specifically for judging this distance d
xwhether meet the following conditions: 0.08 λ
x≤ d
x≤ 0.3 λ
x, suppose f
xfor the transmission frequency of this electromagnetic signal; If meet, be then judged as not needing to retransmit electromagnetic signal;
Frequency-selecting module is this distance d specifically for the judged result of the judged result of the first judge module
x<0.08 λ
xtime, Selection radio f from a described n usable frequency
xanother higher frequency configuration gives the first transmitter module; This distance d
x> 0.3 λ
xtime, Selection radio f from a described n usable frequency
xanother lower frequency configuration gives the first transmitter module.
A kind of terminal, comprising:
Second receiver module, receives the electromagnetic signal that opposite end is launched;
Distance determination module, the electromagnetic signal for receiving according to the second receiver module determines the distance d between itself and opposite end
x;
Second judge module, for this distance d that judging distance determination module is determined
xwhether at the transmission frequency f of this electromagnetic signal
xwithin corresponding effective finding range;
Second transmitter module, when the judged result for the second judge module is no, feeds back corresponding response signal to opposite equip., and response signal is used to indicate opposite equip. and selects another frequency outside transmission of electromagnetic signals again.
Further, the second judge module is specifically for judging this distance d
xwhether meet: 0.08 λ
x≤ d
x≤ 0.3 λ
x, λ
x=C/f
x, C is the light velocity; If meet, be then judged as not needing to retransmit electromagnetic signal; If d
x<0.08 λ
x, then the described response signal that the second transmitter module is launched is used to indicate opposite equip. Selection radio f
xanother higher frequency is outside transmission of electromagnetic signals again; If d
x> 0.3 λ
x, then described in the second transmitter module second transmitter module, response signal is used to indicate opposite equip. Selection radio f
xanother lower frequency is outside transmission of electromagnetic signals again.
The present invention is based on NFER (Near Field EM Ranging, near field electromagnetic positioning) technology, the electric field component of electromagnetic signal and the phase place of magnetic-field component can change along with the change of the spacing of transmit leg and take over party, by comparing its phase differential, the range finding between transmit leg and take over party can be realized, the corresponding finding range of a usual transmission frequency, n corresponding n the finding range of transmission frequency.First terminal of the present invention selects frequency of operation outwards to launch electromagnetic signal for finding range from n the usable frequency preset, and this n usable frequency meets the following conditions: the electromagnetic signal of this n usable frequency transmitting can be used for finding range to continuous print target range in preset range, namely the finding range that this n usable frequency is corresponding is continuous, comprise and intersect or just continue, like this, just there will not be in this preset range measure less than target range.
Further, because phase differential is better with the linearity of the change of distance within the scope of 0.08 λ to 0.3 λ, therefore sets this n usable frequency further and meet the following conditions: 0.3 λ
x>=0.08 λ
x-1, wherein f
x-1, f
xfor adjacent two usable frequencies of a described n usable frequency according to frequency after descending or ascending sequence, and f
x-1<f
x, 1<x≤n, and x is positive integer, like this, this n usable frequency not only can be found range to continuous print target range, and wherein each frequency f
xall can be used for 0.08 λ
xto 0.3 λ
xlinear range finding, precision is higher.
Accompanying drawing explanation
The process flow diagram of the electromagnetic signal transmitting method that Fig. 1 provides for one embodiment of the invention;
The process flow diagram of the method for the realization range finding that Fig. 2 provides for one embodiment of the invention;
The schematic diagram of the terminal that Fig. 3 provides for one embodiment of the invention;
The schematic diagram of the terminal that Fig. 4 provides for one embodiment of the invention;
The system schematic of the realization range finding that Fig. 5 provides for one embodiment of the invention;
The system schematic of the realization range finding that Fig. 6 provides for another embodiment of the present invention.
Embodiment
By reference to the accompanying drawings the present invention is described in further detail below by embodiment.
The process flow diagram of the electromagnetic signal transmitting method that Fig. 1 provides for one embodiment of the invention, as shown in Figure 1, comprises following flow process:
S101, first terminal from the n(n preset be more than or equal to 2 positive integer) select a frequency individual usable frequency, and the outside transmission of electromagnetic signals of frequency selected by adopting, a described n usable frequency meets the following conditions: the electromagnetic signal of described n usable frequency transmitting can be used for finding range to continuous print target range in preset range.
NFER technology, the finding range that transmission frequency f is corresponding is generally 0.05 λ to 0.5 λ, and wherein, λ=C/f, C are the light velocity.Suppose that n the usable frequency that the present invention presets is respectively f
1, f
2..., f
n-1, f
n, then the finding range of its correspondence is respectively: 0.05 λ
1to 0.5 λ
1, 0.05 λ
2to 0.5 λ
2..., 0.05 λ
n-1to 0.5 λ
n-1, 0.05 λ
nto 0.5 λ
n.In order to realize finding range to continuous print target range in preset range, this n usable frequency can be made to meet the following conditions one or condition two:
Condition one: the adjacent two available frequency f of this n usable frequency according to frequency after descending or ascending sequence
x-1, f
xmeet the following conditions and (suppose f
x-1<f
x): 0.5 λ
x>=0.05 λ
x-1, 1<x≤n, and x is positive integer.
Even f
1<f
2<......<f
n-1<f
n, 0.5 λ can be made
n>=0.05 λ
n-1, 0.5 λ
n-1>=0.05 λ
n-2..., 0.5 λ
3>=0.05 λ
2, 0.5 λ
2>=0.05 λ
1.In practical operation, can according to this n of this formula determination frequency usable frequency.This n usable frequency just can realize 0.05 λ
nto 0.5 λ
1the range finding of arbitrary target range.
Although the finding range that transmission frequency f is corresponding can be 0.05 λ to 0.5 λ, within the scope of 0.08 λ to 0.3 λ, phase differential is best with the linearity of distance change, and that is, the range finding of 0.08 λ to 0.3 λ is the most accurate.Therefore, condition two: the adjacent two available frequency f of this n usable frequency according to frequency after descending or ascending sequence
x-1, f
xmeet the following conditions and (suppose f
x-1<f
x): 0.3 λ
x>=0.08 λ
x-1, 1<x≤n, and x is positive integer.
Even f
1<f
2<......<f
n-1<f
n, 0.3 λ can be made
n>=0.08 λ
n-1, 0.3 λ
n-1>=0.08 λ
n-2..., 0.3 λ
3>=0.08 λ
2, 0.3 λ
2>=0.08 λ
1.In practical operation, can according to this n of this formula determination frequency usable frequency.This n usable frequency just can realize 0.08 λ like this
nto 0.3 λ
1the range finding of arbitrary target range.Suppose that the frequency range of this n usable frequency is 300KHz to 30MHz, then the continuous distance can surveyed is 0.8 meter to 300 meters.In practical application, the frequency range of this n usable frequency can be 500KHz to 50MHz.
S102, first terminal judge whether to need to retransmit electromagnetic signal according to the response condition of opposite end, from a described n usable frequency, if so, then select another frequency outside transmission of electromagnetic signals again; Till be judged as not needing to retransmit electromagnetic signal according to the response condition of opposite end.
First terminal judges whether to need to retransmit electromagnetic signal mode according to the response condition of opposite end including, but not limited to:
Mode one: first terminal judges whether the response signal receiving opposite end, if receive, is then judged as needing to retransmit electromagnetic signal, if do not receive, is then judged as not needing to retransmit electromagnetic signal.
This mode is when opposite end is judged as not needing to retransmit electromagnetic signal, then not to first terminal feedback response signal, when opposite end is judged as needing to retransmit electromagnetic signal, ability is to first terminal feedback response signal.
Mode two: first terminal receives the response signal of opposite end feedback, judges whether to need to retransmit electromagnetic signal according to the mark of carrying in response signal, if this response signal carries is the mark needing to resend, is then judged as needing to retransmit electromagnetic signal; If what this response signal was carried is the mark not needing to resend, be then judged as not needing to retransmit electromagnetic signal.
Mode three: first terminal receives the response signal of opposite end feedback, according to the distance d carried in response signal
xjudge whether to need to retransmit electromagnetic signal, this distance d
xthat determine according to the electromagnetic signal received for opposite end and between first terminal distance; Concrete: judge this distance d
xwhether within effective finding range that the transmission frequency of this electromagnetic signal is corresponding, if not, be then judged as needing to retransmit electromagnetic signal; If so, be then judged as not needing to retransmit electromagnetic signal.The transmission frequency f of electromagnetic signal
xcorresponding effective finding range can be: be more than or equal to 0.08 λ
x, and be less than or equal to 0.3 λ
x.Namely first terminal judges this distance d
xwhether meet the following conditions: 0.08 λ
x≤ d
x≤ 0.3 λ
xif meet, be then judged as not needing to retransmit electromagnetic signal; If this distance d
x<0.08 λ
x, then current adopted frequency f is described
xtoo low, then Selection radio f from this n usable frequency
xanother higher frequency is outside transmission of electromagnetic signals again; If this distance d
x> 0.3 λ
x, then current adopted frequency f is described
xtoo high, then Selection radio f from this n usable frequency
xanother lower frequency is outside transmission of electromagnetic signals again.
Effective finding range that the transmission frequency of electromagnetic signal is corresponding can also be: be more than or equal to 0.05 λ
x, and be less than or equal to 0.5 λ
x.
The process flow diagram of the method for the realization range finding that Fig. 2 provides for one embodiment of the invention, as shown in Figure 2, comprises following flow process:
S201, the second terminal receive the electromagnetic signal that opposite end is launched.
S202, the second terminal determine the distance between itself and opposite end according to the electromagnetic signal received.
Concrete, determine the distance between itself and opposite end according to the electric field component of electromagnetic signal received and the phase differential of magnetic-field component.
S203, this distance of the second terminal judges whether within effective finding range that the transmission frequency of this electromagnetic signal is corresponding, if so, then using this distance as net result, terminate range finding; If not, then feed back corresponding response signal to opposite equip., response signal is used to indicate opposite equip. and selects another frequency outside transmission of electromagnetic signals again, and return step S201, until the second terminal according to the distance determined of electromagnetic signal received within effective finding range that the transmission frequency of this electromagnetic signal is corresponding, using this distance as net result, terminate range finding.
As above-mentioned, the transmission frequency f of electromagnetic signal
xcorresponding effective finding range can be: be more than or equal to 0.08 λ
x, and be less than or equal to 0.3 λ
x.I.e. this distance d of the second terminal judges
xwhether meet: 0.08 λ
x≤ d
x≤ 0.3 λ
x; If meet, be then judged as not needing to retransmit electromagnetic signal, range finding terminates; If this distance d
x<0.08 λ
x, then the frequency f that current opposite end adopts is described
xtoo low, then feed back corresponding response signal to opposite equip., be used to indicate opposite equip. and select another higher frequency outside transmission of electromagnetic signals again; If this distance d
x> 0.3 λ
x, then the frequency f that current opposite end adopts is described
xtoo high, then feed back corresponding response signal to opposite equip., be used to indicate opposite equip. and select another more low frequency outside transmission of electromagnetic signals again; Or in another embodiment, feed back corresponding response signal to opposite equip. and carry the distance calculated, by opposite end according to this Distance Judgment the need of repeating transmission electromagnetic signal.
Effective finding range that the transmission frequency of electromagnetic signal is corresponding can also be: be more than or equal to 0.05 λ
x, and be less than or equal to 0.5 λ
x.
The schematic diagram of the terminal that Fig. 3 provides for one embodiment of the invention, as shown in Figure 3, this terminal 3 is as the transmit leg of the electromagnetic signal for finding range, terminal 3 comprises frequency-selecting module 31, first transmitter module 32, first receiver module 33 and the first judge module 34, wherein, frequency-selecting module 31 selects a frequency of operation to configure to the first transmitter module 32 from n the usable frequency preset, n be more than or equal to 2 positive integer, a described n usable frequency meets the following conditions: the electromagnetic signal of described n usable frequency transmitting can be used for finding range to continuous print target range in preset range, first transmitter module 32 adopts the outside transmission of electromagnetic signals of the frequency selected by frequency-selecting module 31, first receiver module 33 receives the response signal of opposite end feedback, first judge module 34 judges whether to need to retransmit electromagnetic signal according to the response condition of opposite end, if when the judged result of the first judge module 34 is for needs repeating transmission electromagnetic signal, frequency-selecting module 31 also for selecting another frequency configuration to the first transmitter module 32 from a described n usable frequency, till the judged result of the first judge module 34 is do not need to retransmit electromagnetic signal.
Preferably, a described n usable frequency meets above-mentioned condition one or condition two, preferably, meets above-mentioned condition two.
In certain embodiments, the first receiver module 33 receives the response signal fed back opposite end and carries that opposite end is determined according to the electromagnetic signal received and between terminal 3 distance d
x, the first judge module 34 is specifically for judging this distance d
xwhether meet the following conditions: 0.08 λ
x≤ d
x≤ 0.3 λ
x(suppose f
xtransmission frequency for this electromagnetic signal); If meet, be then judged as not needing to retransmit electromagnetic signal; If the judged result of the judged result of the first judge module 34 is this distance d
x<0.08 λ
x, frequency-selecting module 31 is also for Selection radio f from a described n usable frequency
xanother higher frequency configuration gives the first transmitter module 32; The outside transmission of electromagnetic signals of the frequency of the first transmitter module 32 also for adopting this higher; This distance d
x> 0.3 λ
x, frequency-selecting module 31 is also for Selection radio f from a described n usable frequency
xanother lower frequency configuration gives the first transmitter module 32; The outside transmission of electromagnetic signals of the frequency of the first transmitter module 32 also for adopting this lower.
In actual applications, terminal 3 can also comprise the module communicated with third party.In certain embodiments, terminal 3 can be beacon equipment generally disposed in the interior, such as, be arranged on the card reader of the 13.56MHz in market.
The schematic diagram of the terminal that Fig. 4 provides for another embodiment of the present invention, as shown in Figure 4, this terminal 4 is as the take over party of the electromagnetic signal for finding range, and terminal 4 comprises the second receiver module 41, distance determination module 42, second judge module 43 and the second transmitter module 44, wherein
The electromagnetic signal that second receiver module 41 is launched for receiving opposite end;
Distance determination module 42 determines the distance between itself and opposite end for the electromagnetic signal received according to the second receiver module 41;
Whether this distance that the second judge module 43 is determined for judging distance determination module 42 is within effective finding range that the transmission frequency of this electromagnetic signal is corresponding;
When second transmitter module 44 is no for the judged result of the second judge module 43, feed back corresponding response signal to opposite equip., response signal is used to indicate opposite equip. and selects another frequency outside transmission of electromagnetic signals again.
In certain embodiments, when the judged result of the second judge module 43 is not for needing to retransmit electromagnetic signal, second transmitter module 44 is not to opposite end transmitting response signal, and when the judged result of the second judge module 43 is for needs repeating transmission electromagnetic signal, the second transmitter module 44 is just to opposite end transmitting response signal;
Or, no matter the judged result of the second judge module 43 retransmits electromagnetic signal for not needing, still need to retransmit electromagnetic signal, second transmitter module 44 is all to opposite end transmitting response signal, the mark of just carrying in response signal is different, when not needing to retransmit electromagnetic signal, if this response signal carries is the mark not needing to resend, need to retransmit electromagnetic signal, what this response signal was carried is the mark needing to resend;
Also or, no matter the judged result of the second judge module 43 retransmits electromagnetic signal for not needing, still need to retransmit electromagnetic signal, second transmitter module 44 is all to opposite end transmitting response signal, and carry distance in response signal, the distance between this distance opposite end that to be terminal 4 determine according to the electromagnetic signal received; Opposite end judges whether to need to retransmit electromagnetic signal according to this distance.
In certain embodiments, the transmission frequency f of electromagnetic signal
xcorresponding effective finding range is: be more than or equal to 0.08 λ
x, and be less than or equal to 0.3 λ
x; I.e. this distance d of determining of terminal 4 judging distance determination module 42
xwhether meet: 0.08 λ
x≤ d
x≤ 0.3 λ
x; If meet, be then judged as not needing to retransmit electromagnetic signal; If this distance d
x<0.08 λ
x, then the transmission frequency f that opposite end is current adopted is described
xtoo low, then to opposite end transmitting response signal, be used to indicate opposite end Selection radio f from this n usable frequency
xanother higher frequency is outside transmission of electromagnetic signals again; If this distance d
x> 0.3 λ
x, then the frequency f that opposite end is current adopted is described
xtoo high, then to opposite end transmitting response signal, be used to indicate opposite end Selection radio f from this n usable frequency
xanother lower frequency is outside transmission of electromagnetic signals again.
Effective finding range that the transmission frequency of electromagnetic signal is corresponding can also be: be more than or equal to 0.05 λ
x, and be less than or equal to 0.5 λ
x.
In certain embodiments, second receiver module 41 comprises that electric signal receives submodule, electric antenna chooser module, multifrequency point array electric antenna (also can be the antenna of other form, as tunable antenna), magnetic signal receive submodule, magnetic antenna chooser module, multifrequency point array magnetic antenna (also can be the antenna of other form, as tunable antenna).Wherein, the combination of electric antenna chooser module and multifrequency point array electric antenna can realize receiving the He Ne laser of electric field component in electromagnetic signal; The combination of magnetic antenna chooser module and multifrequency point array magnetic antenna can realize receiving the He Ne laser of magnetic-field component in electromagnetic signal.
In certain embodiments, terminal 4 can also comprise the module communicated with third party.Terminal 4 can be electronic tag.
The system schematic of the realization range finding that Fig. 5 provides for one embodiment of the invention, as shown in Figure 5, this system 5 comprises 4 first terminals (511,512,513,514), the second terminal 52 and third party 53; These 4 first terminals (511,512,513,514) are arranged on the fixed position in indoor positioning region, and its positional information is stored in third party 53.Third party 53 can be relay services station, also can be the exercisable background server of personnel.In the present embodiment, these 4 first terminals (511,512,513,514) are as the transmit leg of the electromagnetic signal for finding range, and the second terminal 52 is as the take over party of this electromagnetic signal, and the workflow of this system 5 is as follows:
S601, the second terminal 52 enter can locating area start location.
S602, the second terminal 52 first terminal first in region of search, each first terminal (511,512,513,514) in region responds the search signal of the second terminal 52, and respective positional information is sent to the second terminal 52.For the signal conflict preventing each first terminal (511,512,513,514) from sending, can anti-collision algorithms be set, such as timeslot-based anti-collision algorithms, CDMA etc.
S603, second terminal 52 receives each first terminal (511, 512, 513, 514) after positional information, take the method for poll and each first terminal (511, 512, 513, 514) carry out information interaction and find range, the present embodiment takes multifrequency point locator meams of the present invention, i.e. each first terminal (511, 512, 513, 514) from n the usable frequency preset, select frequency of operation to launch the electromagnetic signal for finding range, until selected frequency is optimum, the distance that the second terminal 52 can be allowed to calculate is within effective finding range that the transmission frequency of this electromagnetic signal is corresponding, then enter step S604.Concrete, for first terminal 511:
S603a: first terminal 511 is from the selection frequency f n the frequency preset
xthe electromagnetic signal of outside transmitting for finding range.
The original frequency of acquiescence can be the intermediate frequency in this n frequency, supposes that n the frequency preset is: f
1, f
2..., f
n-1, f
n, and f
1<f
2<......<f
n-1<f
n, preferably, select f
1to f
nintermediate frequency f
n/
2as original frequency f
x.
S603b: the second terminal 52 is according to the electromagnetic signal f received
xthe distance d of test and first terminal 511
x.
S603c: the second terminal 52 judges d
xwhether meet: 0.08 λ
x≤ d
x≤ 0.3 λ
x; If meet, then enter step S604, if not, then enter step S603d.
S603d, the second terminal 52, to first terminal 511 feedback response signal, carry the distance d calculated in this response signal
x.After first terminal 511 receives this response signal, parse distance d wherein
x, judge d
xwhether be less than 0.08 λ
x, if so, then prove the frequency f of the current selection of first terminal 511
xtoo low, then enter step S603e, if not, i.e. d
xbe greater than 0.3 λ
x, prove the frequency f of the current selection of first terminal 511
xtoo high, then enter step S603f.
S603e, first terminal 511 be Selection radio f from this n usable frequency
xanother higher frequency is outside transmission of electromagnetic signals again, namely from f
xto f
nanother frequency of middle selection is outside transmission of electromagnetic signals again, and enters S603a circulation.
S603f, first terminal 511 be Selection radio f from this n usable frequency
xanother lower frequency is outside transmission of electromagnetic signals again, namely from f
1to f
xanother frequency of middle selection is outside transmission of electromagnetic signals again, and enters S603a circulation.
S604, the second terminal 52 by calculate with the distance (each distance is within effective finding range that the transmission frequency of this electromagnetic signal is corresponding) of each first terminal (511,512,513,514), and the positional information correspondence of each first terminal (511,512,513,514) is sent to third party 53.
S605, third party 53 are according to the distance of the second terminal 52 with each first terminal (511,512,513,514), and the positional information of each first terminal (511,512,513,514), calculate the positional information that the second terminal 52 is residing at present.
The positional information that second terminal 52 is residing is at present fed back to the second terminal 52 by S606, third party 53.One-time positioning flow process terminates, and this flow process that can constantly circulate in practical application is to reach the object of refreshing second terminal 52 latest position.
In another embodiment, the system schematic of the realization range finding that Fig. 6 provides for another embodiment of the present invention, as shown in Figure 6, this system 6 comprises 4 the second terminals (611,612,613,614), first terminal 62 and third party 63; These 4 the second terminals (611,612,613,614) are arranged on the fixed position in indoor positioning region, and its positional information is stored in third party 63.Third party 63 can be relay services station, also can be the exercisable background server of personnel.In the present embodiment, first terminal 62 is as the transmit leg of the electromagnetic signal for finding range, and 4 the second terminals (611,612,613,614) are as the take over party of this electromagnetic signal, and the workflow of this system 6 is as follows:
S701, first terminal 62 enter can locating area start location.
S702, first terminal 62 the second terminal (611,612,613,614) first in region of search, the search signal of each second terminal (611,612,613,614) response first terminal 62 in region, and respective positional information is sent to first terminal 62.For the signal conflict preventing each second terminal (611,612,613,614) from sending, can anti-collision algorithms be set, such as timeslot-based anti-collision algorithms, CDMA etc.
S703, first terminal 62 receives each second terminal (611, 612, 613, 614) after positional information, take the method for poll and each second terminal (611, 612, 613, 614) carry out information interaction and find range, the present embodiment takes multifrequency point locator meams of the present invention, namely first terminal 62 selects frequency of operation to launch the electromagnetic signal for finding range from n the usable frequency preset, until selected frequency is optimum, can each second terminal (611, 612, 613, 614) distance calculated is within effective finding range that the transmission frequency of this electromagnetic signal is corresponding, then enter step S704.Concrete:
S703a: first terminal 62 is from the selection frequency f n the frequency preset
xthe electromagnetic signal of outside transmitting for finding range.
The original frequency of acquiescence can be the intermediate frequency in this n frequency, supposes that n the frequency preset is: f
1, f
2..., f
n-1, f
n, and f
1<f
2<......<f
n-1<f
n, preferably, select f
1to f
nintermediate frequency f
n/
2as original frequency f
x.
For the second terminal 611:
S703b: the second terminal 611 is according to the electromagnetic signal f received
xthe distance d of test and first terminal 62
x.
S703c: the second terminal 611 judges d
xwhether meet: 0.08 λ
x≤ d
x≤ 0.3 λ
x; If meet, then enter step S704, if not, then enter step S703d.
S703d, the second terminal 611 judge d
xwhether be less than 0.08 λ
x, if so, then prove the frequency f of the current selection of first terminal 62
xtoo low, then enter step S703e, if not, i.e. d
xbe greater than 0.3 λ
x, prove the frequency f of the current selection of first terminal 62
xtoo high, then enter step S703f.
S703e, the second terminal 611 are to first terminal 62 feedback response signal, and this response signal is used to indicate first terminal 62 and selects Selection radio f from this n usable frequency
xanother higher frequency is outside transmission of electromagnetic signals again, namely from f
xto f
nanother frequency of middle selection is outside transmission of electromagnetic signals again, and enters S703a circulation.
S703f, the second terminal 611 are to first terminal 62 feedback response signal, and this response signal is used to indicate first terminal 62 and selects Selection radio f from this n usable frequency
xanother lower frequency is outside transmission of electromagnetic signals again, namely from f
1to f
xanother frequency of middle selection is outside transmission of electromagnetic signals again, and enters S703a circulation.
S704, each second terminal (611,612,613,614) by calculate with the distance (each distance is within effective finding range that the transmission frequency of this electromagnetic signal is corresponding) of first terminal 62, and the positional information correspondence of each second terminal (611,612,613,614) is sent to third party 63.
S705, third party 63 are according to the distance of each second terminal (611,612,613,614) with first terminal 62, and the positional information of each second terminal (611,612,613,614), calculate the positional information that first terminal 62 is residing at present.
The positional information that first terminal 62 is residing is at present fed back to first terminal 62 by S706, third party 63.One-time positioning flow process terminates, and this flow process that can constantly circulate in practical application reaches the object refreshing first terminal 62 latest position.
First terminal of the present invention selects frequency of operation outwards to launch electromagnetic signal for finding range from n the usable frequency preset, and this n usable frequency meets the following conditions: the electromagnetic signal of this n usable frequency transmitting can be used for finding range to continuous print target range in preset range, like this, just there will not be in this preset range measure less than target range.Further, set this n usable frequency to meet the following conditions: 0.3 λ
x>=0.08 λ
x-1, wherein f
x-1, f
xfor adjacent two usable frequencies of a described n usable frequency according to frequency after descending or ascending sequence, and f
x-1<f
x, 1<x≤n, and x is positive integer, like this, this n usable frequency not only can be found range to continuous print target range, and wherein each frequency f
xall can be used for 0.08 λ
xto 0.3 λ
xlinear range finding, precision is higher.
Above content is in conjunction with concrete embodiment further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. an electromagnetic signal transmitting method, is characterized in that, comprises the following steps:
First terminal selects a frequency from n the usable frequency preset, n be more than or equal to 2 positive integer, and the outside transmission of electromagnetic signals of frequency selected by adopting, a described n usable frequency meets the following conditions: the electromagnetic signal of described n usable frequency transmitting can be used for finding range to continuous print target range in preset range;
First terminal judges whether to need to retransmit electromagnetic signal according to the response condition of opposite end, from a described n usable frequency, if so, then select another frequency outside transmission of electromagnetic signals again; Till be judged as not needing to retransmit electromagnetic signal according to the response condition of opposite end.
2. electromagnetic signal transmitting method as claimed in claim 1, is characterized in that, the adjacent two available frequency f of a described n usable frequency according to frequency after descending or ascending sequence
x-1, f
xmeet the following conditions, suppose f
x-1<f
x: 0.3 λ
x>=0.08 λ
x-1; Wherein, λ
x=C/f
x, C is the light velocity; 1<x≤n, and x is positive integer.
3. electromagnetic signal transmitting method as claimed in claim 2, is characterized in that, according to the response condition of opposite end, first terminal judges whether that needing to retransmit electromagnetic signal comprises:
Receive the response signal of opposite end feedback, described response signal carries that opposite end is determined according to the electromagnetic signal received and between first terminal distance d
x;
Judge this distance d
xwhether meet the following conditions: 0.08 λ
x≤ d
x≤ 0.3 λ
x, suppose f
xfor the transmission frequency of this electromagnetic signal; If meet, be then judged as not needing to retransmit electromagnetic signal;
If d
x<0.08 λ
x, then select from a described n usable frequency another frequency again outwards transmission of electromagnetic signals be specially: Selection radio f from a described n usable frequency
xanother higher frequency is outside transmission of electromagnetic signals again;
If d
x> 0.3 λ
x, then select from a described n usable frequency another frequency again outwards transmission of electromagnetic signals be specially: Selection radio f from a described n usable frequency
xanother lower frequency is outside transmission of electromagnetic signals again.
4. realize a method of finding range, it is characterized in that, comprise the following steps:
Step one, the second terminal receive the electromagnetic signal that opposite end is launched;
Step 2, the second terminal determine the distance d between itself and opposite end according to the electromagnetic signal received
x;
Step 3, this distance d of the second terminal judges
xwhether at the transmission frequency f of this electromagnetic signal
xwithin corresponding effective finding range, if not, then feed back corresponding response signal to opposite equip., response signal is used to indicate opposite equip. and selects another frequency outside transmission of electromagnetic signals again, and returns step one.
5. the method realizing range finding as claimed in claim 4, is characterized in that, this distance d of the second terminal judges
xwhether at the transmission frequency f of this electromagnetic signal
xcomprise within corresponding effective finding range:
Judge this distance d
xwhether meet: 0.08 λ
x≤ d
x≤ 0.3 λ
x, wherein, λ
x=C/f
x, C is the light velocity; If meet, be then judged as not needing to retransmit electromagnetic signal;
If d
x<0.08 λ
x, then described response signal is used to indicate opposite equip. Selection radio f
xanother higher frequency is outside transmission of electromagnetic signals again;
If d
x> 0.3 λ
x, then described response signal is used to indicate opposite equip. Selection radio f
xanother lower frequency is outside transmission of electromagnetic signals again.
6. a terminal, is characterized in that, comprising:
Frequency-selecting module, for selecting a frequency configuration to the first transmitter module from n the usable frequency preset, n be more than or equal to 2 positive integer, a described n usable frequency meets the following conditions: the electromagnetic signal that described n usable frequency is launched can be used for finding range to continuous print target range in preset range; Also for when the judged result of the first judge module retransmits electromagnetic signal for needs, from a described n usable frequency, select another frequency configuration to the first transmitter module; Till the judged result of the first judge module is do not need to retransmit electromagnetic signal;
First transmitter module, for adopting the outside transmission of electromagnetic signals of the frequency selected by frequency-selecting module;
First receiver module, for receiving the response signal of opposite end feedback;
First judge module, needs to retransmit electromagnetic signal for judging whether according to the response condition of opposite end.
7. terminal as claimed in claim 6, is characterized in that, the adjacent two available frequency f of a described n usable frequency according to frequency after descending or ascending sequence
x-1, f
xmeet the following conditions, suppose f
x-1<f
x: 0.3 λ
x>=0.08 λ
x-1; Wherein, λ
x=C/f
x, C is the light velocity; 1<x≤n, and x is positive integer.
8. terminal as claimed in claim 7, is characterized in that, described response signal carries that opposite end is determined according to the electromagnetic signal received and between described terminal distance d
x, the first judge module is specifically for judging this distance d
xwhether meet the following conditions, suppose f
xtransmission frequency for this electromagnetic signal: 0.08 λ
x≤ d
x≤ 0.3 λ
x; If meet, be then judged as not needing to retransmit electromagnetic signal;
Frequency-selecting module is this distance d specifically for the judged result of the judged result of the first judge module
x<0.08 λ
xtime, Selection radio f from a described n usable frequency
xanother higher frequency configuration gives the first transmitter module; This distance d
x> 0.3 λ
xtime, Selection radio f from a described n usable frequency
xanother lower frequency configuration gives the first transmitter module.
9. a terminal, is characterized in that, comprising:
Second receiver module, receives the electromagnetic signal that opposite end is launched;
Distance determination module, the electromagnetic signal for receiving according to the second receiver module determines the distance d between itself and opposite end
x;
Second judge module, for this distance d that judging distance determination module is determined
xwhether at the transmission frequency f of this electromagnetic signal
xwithin corresponding effective finding range;
Second transmitter module, when the judged result for the second judge module is no, feeds back corresponding response signal to opposite equip., and response signal is used to indicate opposite equip. and selects another frequency outside transmission of electromagnetic signals again.
10. terminal as claimed in claim 9, it is characterized in that, the second judge module is specifically for judging this distance d
xwhether meet: 0.08 λ
x≤ d
x≤ 0.3 λ
x, λ
x=C/f
x, C is the light velocity; If meet, be then judged as not needing to retransmit electromagnetic signal; If d
x<0.08 λ
x, then the described response signal that the second transmitter module is launched is used to indicate opposite equip. Selection radio f
xanother higher frequency is outside transmission of electromagnetic signals again; If d
x> 0.3 λ
x, then described in the second transmitter module second transmitter module, response signal is used to indicate opposite equip. Selection radio f
xanother lower frequency is outside transmission of electromagnetic signals again.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310628329.8A CN104678352A (en) | 2013-11-28 | 2013-11-28 | Electromagnetic signal transmitting method, method for realizing distance measurement and terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310628329.8A CN104678352A (en) | 2013-11-28 | 2013-11-28 | Electromagnetic signal transmitting method, method for realizing distance measurement and terminal |
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| CN104678352A true CN104678352A (en) | 2015-06-03 |
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ID=53313681
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|---|---|---|---|
| CN201310628329.8A Pending CN104678352A (en) | 2013-11-28 | 2013-11-28 | Electromagnetic signal transmitting method, method for realizing distance measurement and terminal |
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Application publication date: 20150603 |