CN102043151B - Mobile terminal and method for positioning based on radio frequency identification - Google Patents

Mobile terminal and method for positioning based on radio frequency identification Download PDF

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Publication number
CN102043151B
CN102043151B CN200910178192.4A CN200910178192A CN102043151B CN 102043151 B CN102043151 B CN 102043151B CN 200910178192 A CN200910178192 A CN 200910178192A CN 102043151 B CN102043151 B CN 102043151B
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frequency
radiofrequency signal
module
location
radio
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CN102043151A (en
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沈少武
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ZTE Corp
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ZTE Corp
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W64/00Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S13/00Systems 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
    • G01S13/74Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
    • G01S13/75Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems using transponders powered from received waves, e.g. using passive transponders, or using passive reflectors

Abstract

The invention provides a mobile terminal and a method for positioning based on radio frequency identification (RFID). The mobile terminal comprises a microwave antenna, a radio frequency identification analog front end module connected with the microwave antenna, a positioning processing module connected with the microwave antenna, and a digital baseband processing module connected with the radio frequency identification analog front end module and the positioning processing module respectively. The positioning method comprises that: a first terminal transmits a radio frequency signal for requesting positioning; the first terminal receives a radio frequency signal which is returned by a second terminal and is used for responding to positioning; the first terminal acquires corresponding power value, phase and time according to the radio frequency signal for requesting positioning and/or the radio frequency signal for responding to positioning; and the first terminal acquires positioning information according to the power, phase and time. Therefore, the mobile terminal and the method for positioning based on RFID can realize real-time positioning function and accurately and rapidly determine a relative position of the opposite side in an electromagnetic induction range.

Description

Mobile terminal and localization method based on radio-frequency (RF) identification for locating
Technical field
The present invention relates to mobile communication positioning field, relate in particular to a kind of based on radio-frequency (RF) identification (RadioFrequency Identification is called for short RFID) mobile terminal and the localization method for locating.
Background technology
Existing terminal positioning mode has following several:
First kind of way is GPS (GPS), but because GPS belongs to satnav, has intrinsic positioning precision problem in the time carrying out indoor positioning, so must solve indoor positioning problem by other location technologies.
The second way is infrared ray locator meams, and the Active Badge system of for example Olivetti research laboratory adopts infrared technology to realize indoor positioning.But shorter this two large major defect of straight line sighting distance and transmission range makes the poor effect of its indoor positioning.
The third mode is that IEEE802.11:RADAR is a kind of indoor locating system based on radio frequency, adopts 802.11 networks of standard to position for space.The mode that this system employing experience test and signal propagation model combine, be easy to install, need little base station, can adopt identical bottom wireless network architecture, but, up to the present, the positioning precision of most of system that uses 802.11 technology fails to reach desirable yardstick, and system resultnat accuracy is high.
The 4th kind of mode is ultrasound wave locator meams; For example cricket location back-up system Cricket LocationSupport System and active bat Active Bat are two exemplary that adopt ultrasound wave location, and they adopt ultrasound wave delay time signal to position.Although overall positioning precision is higher, need a large amount of bottom hardware facility investments, cost is too high.
At present, radio-frequency (RF) identification is a kind of contactless automatic identification technology, and it utilizes radiofrequency signal and Space Coupling and transport property, realizes the automatic identification to static or mobile article.REID has noncontact, precision is high, information management is rapid, all weather operations and the good series of advantages such as applied environment adaptability, is obtaining development very rapidly in recent years.
The composition of rfid system generally comprises two parts: (1) electronic tag (Tag): information carrier, is made up of label chip and antenna; (2) reader (Reader): the equipment that reads or write label information.
Nowadays, the function of mobile phone from strength to strength, and there is integrated multi-purpose trend, by the combination of mobile phone and RFID technology, make mobile phone possess the field of the mutual location of short distance, can further expand using value and the usable range of mobile phone, bring more facility to people's life, also there is no at present this proven technique.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of localisation of mobile terminals and localization method based on radio-frequency (RF) identification (RFID), to solve the problem such as positioning precision and cost that in prior art, various locator meamss exist.
In order to solve the problems of the technologies described above, the invention provides a kind of localisation of mobile terminals based on radio-frequency (RF) identification (RFID), this mobile terminal comprises:
Microwave antenna, for receiving that opposite end mobile terminal sends or sending for asking location and the radiofrequency signal of response location or the radiofrequency signal for identifying to opposite end mobile terminal;
Radio-frequency (RF) identification analog front-end module, is connected with described microwave antenna, for to receiving the described radiofrequency signal demodulation generating digital signal for identifying;
Localization process module, is connected with described microwave antenna, for obtaining its corresponding performance number, phase place and time according to described for asking the radiofrequency signal of location and/or responding the radiofrequency signal of locating;
Digital base band processor module, be connected respectively with described radio-frequency (RF) identification analog front-end module and localization process module, for identifying for the radiofrequency signal of identifying according to being demodulated to the described of digital signal, and obtain locating information according to described power, phase place and time respectively.
The described localisation of mobile terminals based on radio-frequency (RF) identification also comprises:
Locating information simulant display model, is connected with described digital base band processor module, for locating information is shown according to planimetric coordinates and three dimensional space coordinate.
The described localisation of mobile terminals based on radio-frequency (RF) identification also comprises:
The Subscriber Identity Module of supporting single-wire-protocol, is connected with described radio-frequency (RF) identification analog front-end module, for storing the unique sequence number of radio-frequency (RF) identification; And
Described digital base band processor module, with described radio-frequency (RF) identification analog front-end module, is further used for relatively identifying for radiofrequency signal and the unique sequence number of described radio-frequency (RF) identification identified being demodulated to the described of digital signal.
Described radio-frequency (RF) identification analog front-end module is connected with described baseband processing module by UART Universal Asynchronous Receiver Transmitter interface, and is connected with the pin of described Subscriber Identity Module by signal wire.
Described localization process module comprises:
RF power strength detecting device, be connected with described digital base band processor module, for the radiofrequency signal for responding location receiving is detected, obtain its performance number and be sent to described digital base band processor module, described digital base band processor module is further used for calculating the first distance according to described performance number;
Phase detector, be connected with described digital base band processor module, for gathering the phase place that sends the radiofrequency signal for asking location and receive the radiofrequency signal for responding location, output to described digital base band processor module and calculate phase difference value, and described digital base band processor module is further used for calculating second distance according to described phase difference value;
Frequency divider, be connected with described digital base band processor module, for frequency is divided into different brackets, described for asking the radiofrequency signal of location and for responding time of radiofrequency signal of location to measure in the frequency of variant grade, output to described digital base band processor module difference computing time, and described digital base band processor module is further used for calculating the 3rd distance according to described time difference.
Described microwave antenna is antenna integrated on micro-band or dipole sheet.
The described localisation of mobile terminals based on radio-frequency (RF) identification also comprises power management module, is connected, for it is powered with described baseband processing module, localization process module and radio-frequency (RF) identification analog front-end module.
The present invention also provides a kind of localization method based on radio-frequency (RF) identification (RFID), and the method comprises:
First terminal sends and is used for asking to locate radiofrequency signal;
First terminal receive that the second terminal returns for responding the radiofrequency signal of location;
First terminal obtains its corresponding performance number, phase place and time according to described for asking the radiofrequency signal of location and/or responding the radiofrequency signal of locating;
First terminal obtains locating information according to described power, phase place and time.
Before being used for asking to locate radiofrequency signal, step transmission also comprises:
First terminal is searched for the second terminal, sends the radiofrequency signal for identifying to it;
The second terminal compares the unique sequence number of radio-frequency (RF) identification of storing for the radiofrequency signal identified and its Subscriber Identity Module receiving, and determines consistent the positioning of the unique sequence number of described identifier and radio-frequency (RF) identification.
Described in described basis, obtaining its corresponding performance number, phase place and time for the radiofrequency signal of the radiofrequency signal of locating and/or response location is specially:
By RF power strength detecting device, the radiofrequency signal for responding location receiving is detected, obtain its performance number;
By frequency divider, frequency is divided into different brackets, described for asking the radiofrequency signal of location and for responding the time between the radiofrequency signal of location to measure in the frequency of variant grade;
Phase place while sending the radiofrequency signal for asking location by phase detector collection and receive the phase place when responding the radiofrequency signal of location.
Describedly obtain locating information according to described power, phase place and time and specifically comprise:
Digital base band processor module, according to described performance number, is scaled the first distance value according to channel fading model by described performance number;
Time difference in the frequency of the described variant grade of described digital base band processor module calculating, and for calculating second distance according to described time difference;
Described digital base band processor module is the phase place when asking the radiofrequency signal of location and receive the phase calculation phase difference value when responding the radiofrequency signal of location according to the transmission gathering, and calculates the 3rd distance according to described phase difference value;
Obtain the final distance of locating information based on the first distance, second distance and the 3rd distance.
Therefore, the present invention is based on the location that RFID provides for the mobile terminal of locating and method, be a kind of omnibearing angel, high precision, exempt from real-time intelligent type location and the tracker of alignment, penetrability, identification automatically, microminiaturized, security, as long as both sides' opening module, within the scope of electromagnetic wave induction, just can realize real-time positioning function, determine accurately and fast the other side's relative position.
Brief description of the drawings
Fig. 1 the present invention is based on the mobile terminal structure schematic diagram of radio-frequency (RF) identification for locating;
Fig. 2 is the process flow diagram that the present invention is based on the localization method of radio-frequency (RF) identification;
Fig. 3 is that localization process module of the present invention is calculated the process flow diagram that obtains locating information to digital signal.
Embodiment
Below by drawings and Examples, the technical scheme of the embodiment of the present invention is described in further detail.
The present invention is based on radio frequency recognition principle, the principle of traditional radio frequency location and traditional range measurement system are for example integrated in, in intelligent mobile terminal (mobile phone), add short distance location algorithm, can be for short distance range finding and the location that (comprises loose impediment) between two articles.
Radio frequency recognition principle is based upon on electromagnetic distance measurement basis.The method of electromagnetic distance measurement mainly contains three kinds, the RSS based on received field strength (received signal strength) method, based on the incoming wave TOA of time of arrival (time of arrival) method, AOA (angle ofarrival) method based on incoming wave arrival angle degree.
The invention provides the radio-frequency (RF) identification positioning system that is integrated in mobile terminal (for example mobile phone), process and transmission by the interactive signal of electromagnetic range finding and angle measurement and mobile terminal, carry out identification, location and the tracking of short distance target.
Fig. 1 the present invention is based on the mobile terminal structure schematic diagram of radio-frequency (RF) identification for locating.The present invention has intelligent recognition function for the mobile terminal of locating, and Subscriber Identity Module has been carried out to improvement and integrated antenna on microwave sheet.Between two mobile terminals, position range finding in the present invention, the mobile terminal of initiating this requirement is called to inquiry terminal, the mobile terminal being positioned is called as to target terminal.
As shown in the figure, should comprise microwave antenna 11, radio-frequency (RF) identification analog front-end module 12, digital base band processor module 13 and localization process module 14 for the mobile terminal 1 of locating based on radio-frequency (RF) identification, and also comprise positioning monitoring display module 15.Wherein microwave antenna 11, for receiving and dispatching for asking location and the radiofrequency signal of response location or the radiofrequency signal for identifying, microwave antenna is antenna integrated on micro-band or dipole sheet, if mobile terminal is as target terminal, its have the inquiry terminal of the reception identification signal (being the radiofrequency signal of No. ID with target terminal that inquiry terminal sends to target terminal) of sending and, receive the function of the radiofrequency signal for responding location being given to inquiry terminal by reflection modulation, mobile terminal is as inquiry terminal, there is the radiofrequency signal sending with No. ID, target terminal to target terminal, send request the radiofrequency signal of location, and receiving target end reflection through ovennodulation the radiofrequency signal for locating,
Radio-frequency (RF) identification (RFID) analog front-end module 12, be connected with described microwave antenna 11, be used for the radiofrequency signal demodulation generating digital signal for locating receiving, this radio-frequency (RF) identification analog front-end module 12 specifically comprises voltage conversion circuit, electrify restoration circuit, reference source circuit, and the several parts of signal demodulating circuit, be used to provide burning voltage by voltage conversion circuit, the purposes of electrify restoration circuit is that in system, sequential circuit is set to state at the beginning, to prevent logical miss, reference source circuit provides reference offset accurately for simulation.The major function of signal demodulating circuit is that the modulation that receives from microwave antenna has in the carrier wave of digital signal and recovers digital signal.
Localization process module 14, is connected with described microwave antenna 11, for obtaining its corresponding performance number, phase place and time according to described for asking the radiofrequency signal of location and/or responding the radiofrequency signal of locating;
Digital base band processor module 13, is connected with described localization process module 14, for identifying for the radiofrequency signal of identifying according to being demodulated to the described of digital signal, and obtains locating information according to described power, phase place and time respectively.
Locating information simulant display model 15, is connected with described digital base band processor module 13, for locating information is shown according to planimetric coordinates and three dimensional space coordinate.The value of the locating information that locating information simulant display model 15 calculates by localization process module 14, according to planimetric coordinates and three dimensional space coordinate, the relative position of target terminal and inquiry terminal is dynamically presented in LCD interfaces windows, realizes system real-time follow-up location.
As shown in Figure 1, this mobile terminal also comprises: support the Subscriber Identity Module 16 of single-wire-protocol (single Wire Protocol, SWP), for storing the unique sequence number of radio-frequency (RF) identification.Described digital base band processor module, with described radio-frequency (RF) identification analog front-end module, is further used for relatively identifying for radiofrequency signal and the unique sequence number of described radio-frequency (RF) identification identified being demodulated to the described of digital signal.
Radio-frequency (RF) identification analog front-end module 12 is by UART Universal Asynchronous Receiver Transmitter interface (UniversalAsynchronous Receiver Transmitter, be called for short UART) be connected with described digital base band processor module 13, and be connected with the pin of described Subscriber Identity Module 16 by signal wire.
As shown in the figure, this terminal also comprises power management module 17, all be connected with described baseband processing module 13, locating information simulant display model 15, localization process module 14 and radio-frequency (RF) identification (RFID) analog front-end module 12, for it is powered, only indicate in the accompanying drawings the electrical connection of power management module 17 with locating information simulant display model 15.
Continue referring to Fig. 1, this localization process module 14 comprises: RF power strength detecting device 141, be connected with described digital base band processor module 13, for the radiofrequency signal for responding location receiving is detected, obtain its performance number and be sent to described digital base band processor module, described digital base band processor module is further used for calculating the first distance according to described performance number;
Frequency divider 143, be connected with described digital base band processor module 13, for frequency is divided into different brackets, described for asking the radiofrequency signal of location and for responding time of radiofrequency signal of location to measure in the frequency of variant grade, output to described digital base band processor module difference computing time, and described digital base band processor module is further used for calculating the 3rd distance according to described time difference.Because distance has km, hundred meters, the different units such as rice, so need frequency divider to divide to occur frequently the wave frequency of corresponding precision, for example separate frequency f 1, f2, f3 and the f4 of four different brackets, in the frequency of these grades, record described for asking the radiofrequency signal of location and for responding time of radiofrequency signal of location, digital base band processor module difference computing time, and described digital base band processor module calculates four the 3rd distances according to for example four time differences, the final second distance of acquisition after the accumulative total that superposes;
Phase detector 142, be connected with described digital base band processor module 13, for gathering the phase place that sends the radiofrequency signal for asking location and receive the radiofrequency signal for responding location, output to described digital base band processor module and calculate phase difference value, and described digital base band processor module is further used for calculating the 3rd distance according to described phase difference value;
The course of work between the modules of the localisation of mobile terminals based on radio-frequency (RF) identification provided by the invention is: the mobile terminal with above-mentioned each functional module, in the time will locating the position of other mobile terminals as inquiry terminal, activate its each function, the target terminal that will inquire about within the scope of search electromagnetic wave induction, (mainly pass through anti-collision algorithm) when identifying after target terminal ID, set up communication by identity authentication protocol and this target terminal, target terminal receives after signal, from sleep pattern, wake up, then, whether the unique sequence number of radio-frequency (RF) identification of relatively storing in self Subscriber Identity Module is consistent with in the radiofrequency signal receiving No. ID, the terminal number not conforming to enters park mode again, the terminal conforming to enters mode of operation, received RF signal also returns signal reflex to inquiry terminal and (is reflected back the radiofrequency signal of inquiry terminal herein, be the radiofrequency signal for responding location), send into localization process module, calculate its position data by digital base band processor module, then the position data of three kinds of algorithms is carried out to compound operation, then result dynamic similation is shown on simulant display model.
In actual applications, improvement on mobile terminal is specially, on such as mobile phone of mobile terminal etc., realizing this scheme, need on this mobile terminal, to increase ultrahigh frequency RFID analog front-end chip be RFID analog front-end module, antenna integrated on micro-band or dipole sheet, and use the Subscriber Identity Module of supporting SWP agreement, be encoding and decoding, the anti-collision function that completes digital signal in digital base band processor module at digital baseband chip simultaneously.Meanwhile, only need on mobile phone, increase RF power level detecting device, phase detector and frequency divider, form localization process module.
And particularly, RFID analog front-end module is communicated by letter with digital baseband chip by UART interface, complete the conversion of simulating signal to digital signal, for example, be connected with the C6 pin of Subscriber Identity Module (SIM card or UIM card) by a signal wire simultaneously, unique radio-frequency (RF) identification sequence number is stored in Subscriber Identity Module, uses SWP agreement to communicate by letter with the applying portion in Subscriber Identity Module.
Use the microstrip antenna of 2.4GHz to be placed in the back side of mobile phone cover, receive and dispatch radiofrequency signal.Microstrip antenna and wireless near field communication (Near Field Communication is called for short NFC) chip is directly connected, then and battery be close to and be placed between battery and cell phone rear cover, user does not need to change mobile phone.Ultrahigh frequency RFID analog front-end chip and SIM card couple together by C6 pin, realize full duplex communication.Ultrahigh frequency RFID analog front-end chip is connected with microstrip antenna, realize transmitting and receiving of ultrahigh frequency RFID analog front-end chip, the information exchange receiving is crossed generating digital signal after the demodulation of ultrahigh frequency RFID analog front-end chip and is transferred to the AP layer processing of baseband chip.Localization process module is controlled by the universal input output (General Purpose I/O is called for short GPIO) mouthful of digital baseband chip, is powered by power management module.
The process that mobile terminal based on said structure function positions, the localization method process flow diagram that the present invention is based on radio-frequency (RF) identification as shown in Figure 2.First summarized introduction, the mobile terminal activating RFID positioning function with above-mentioned functions activates its functional module, the target terminal in inquiry terminal search induction field; Set up orientation and communication by mutual cipher authentication, set up after communication, in the radiofrequency signal that checking inquiry terminal sends No. ID is consistent with the unique sequence number of radio-frequency (RF) identification of the target terminal waking up, then set up orientation and communication, target terminal is waited for the positioning instruction of inquiry terminal, and inquiry terminal sends positioning instruction to target terminal; Target terminal sends response (for responding the radiofrequency signal of location) to inquiry terminal after receiving positioning instruction.Inquiry terminal is converted into range information by reflected signal (for responding the radiofrequency signal of location) through above-mentioned digital baseband block and the each resume module of localization process module, deposits in flash memory.Inquiry terminal sends positioning instruction near certain reference target, calculates and the range information of reference target according to above-mentioned steps, deposits flash chip in.Inquiry terminal, through localization process module, calculates the azimuthal coordinates of target terminal, then it is shown apart from the simulation of the angle orientation value of information, realizes location.The present invention can also resend positioning instruction after 10 seconds in inquiry terminal interval, target terminal sends after response, reenters wait accepting state, and inquiry terminal receives calculating location information again after response, dynamic transmission is to display window, thereby realizes dynamic track and localization.
As shown in Figure 2, whole position fixing process comprises the following steps:
Step 21, first terminal (being inquiry terminal) search the second terminal (being target terminal), sets up communication by identity authentication protocol, sends the radiofrequency signal for identifying to it; ;
Step 22, the second terminal compares the unique sequence number of radio-frequency (RF) identification of storing for the radiofrequency signal identified and its Subscriber Identity Module receiving, determine that the unique sequence number of described identifier and radio-frequency (RF) identification is consistent, the second terminal, in mode of operation, waits for that first terminal sends positioning instruction;
Step 23, it is positioning instruction that first terminal is used for asking to locate radiofrequency signal to the second terminal transmission;
Step 24, the second terminal sends response (for responding the radiofrequency signal of location) to first terminal;
Step 25, first terminal receives this reflected signal (for responding the radiofrequency signal of location) by microwave antenna
Step 26, first terminal, by localization process module, obtains its corresponding performance number, phase place and time according to described for the radiofrequency signal of locating and/or the radiofrequency signal that responds location;
Step 27, first terminal obtains locating information by digital base band processor module according to described power, phase place and time.
Step 27 first terminal obtains locating information by digital base band processor module according to described power, phase place and time, and this position fixing process specifically as shown in Figure 3, comprising:
Step 271, the digital signal strength after the demodulation that inquiry terminal is reflected back target terminal is carried out filter and amplification by wave filter, amplifier;
Step 272, for respond radio frequency signal acquisition its performance number of location, according to channel fading model by described performance number is scaled modal distance parameter value (what now calculate be first distance) described in detecting through radio frequency power detector; Be specially after filtering and be input to RF power strength detecting device after amplification, testing result becomes digital signal after AD conversion, digital base band processor module is converted into field intensity value by known channel fading model the distance of two terminals, no matter indoor or outdoors channel, average received signal power is with the logarithmic decrement of distance.The distance correspondence that is signal intensity and interrogator and transponder is as follows:
P(r)=P(r 0)-10αlog(r/r 0) (1)
Be wherein the power that P (r) inquiry terminal receives, r is the distance between terminal to be positioned (being first terminal) and inquiry terminal (i.e. the second terminal).R0 is near-earth reference distance, the signal power of P (r0) reference point, and a parameter is path loss index, increases along with the increase apart from r.At free space, a is 2; In the time that indoor view distance is propagated, a is 1.6-1.8, and in the time having restraining mass, it is large that a becomes.Corresponding model parameter value is stored in the database of localization process module, freely selects according to the difference of environment.By field intensity scaled distance, calculate respective distances value and deposit in the numerical value register of first terminal;
Step 273, first terminal, according to the first distance in numerical value register, calculates modulation frequency, and the then modulation frequency of control antenna transmitting different length, uses large frequency to survey chi for long distance, and short distance is used small frequency to survey chi; By frequency divider, frequency is divided into different brackets, described for asking the radiofrequency signal of location and for responding the time between the radiofrequency signal of location to measure in the frequency of variant grade, in mobile phone, adopt frequency divider to separate a series of frequencies by centre frequency, it is poor that mobile phone records round signal time by internal timer, then be converted into second distance by formula D=1/2*c*t, the carrying out stack calculating obtained to second distance and deposit second value register in.D is distance, and C is electromagnetic wave speed;
Step 274, the phase place while sending the radiofrequency signal for asking location by phase detector collection and receive the phase place when responding the radiofrequency signal of location.
After the phase result that phase detector obtains, notifying digital baseband processing module to calculate phase differential is that signal comes and goes total phase delay that survey line once produces, convert and obtain the 3rd distance by following formula,
---signal comes and goes total phase delay that survey line once produces
The angular frequency of ω---modulation signal, ω=2 π fU---bit length, numerical value equals 1/4 modulation wavelength
N---survey line comprises modulation half-wavelength number
---signal comes and goes survey line and once produces the not enough π part of phase delay
The fraction part of the not enough half-wavelength of Δ N---modulating wave that survey line comprises
Numerical value substitution base band is surveyed to phase location model, calculate the 3rd distance and deposit numerical value register in;
Signal intensity processing, the difference frequency that these three steps of step 273-275 are described surveys chi processing and phase demodulation measurement is all prior art, no longer carries out detailed repeating.
Step 275, first terminal is selected compound operation parameter value by specific environment, digital base band processor module 13 is according to according to actual operating environment, for example spacious place, indoor or have weighting that one of selections such as barrier is different parameters value to carry out composite computing to above-mentioned three distances to draw final range information.
Step 276, near reference target source first terminal transmits signals to, through above-mentioned steps computing reference target range information.
Step 277, first terminal, by triangulation calculation model, draws target terminal and inquiry terminal angle information.
Step 278, first terminal locating information simulant display model passes through position coordinates model, centered by first terminal, the positional information of 3-D display target terminal.Thereby realize the location to target terminal.
After above-mentioned steps, can also comprise dynamic display position information realization following function, further comprising the steps of: first terminal interval 10s transmitting inquiry message once, redeterminate locating information (specifically measure process as shown in Figure 3 above), thereby capable of dynamic display-object terminal positional information, realizes following function.
The present invention is based on RFID principle and realized real-time location and tracking, mobile terminal of the present invention is a kind of omnibearing angel, high precision, exempt from alignment, real-time intelligent type location and the tracker of penetrability, identification automatically, microminiaturized, security.As long as both sides open above-mentioned each module, within the scope of electromagnetic wave induction, just can realize real-time positioning function, determine accurately and fast the other side's relative position.
Finally should be noted that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify, change or be equal to replacement to the present invention, and not depart from the spirit and scope of the present invention and claim.

Claims (8)

1. the mobile terminal for locating based on radio-frequency (RF) identification, is characterized in that comprising:
Microwave antenna, for receiving that opposite end mobile terminal sends or sending for asking location and the radiofrequency signal of response location or the radiofrequency signal for identifying to opposite end mobile terminal;
Radio-frequency (RF) identification analog front-end module, is connected with described microwave antenna, for to receiving the described radiofrequency signal demodulation generating digital signal for identifying;
Localization process module, is connected with described microwave antenna, for obtaining its corresponding performance number, phase place and time according to described for asking the radiofrequency signal of location and/or responding the radiofrequency signal of locating;
Digital base band processor module, be connected respectively with described radio-frequency (RF) identification analog front-end module and localization process module, for identifying for the radiofrequency signal of identifying according to being demodulated to the described of digital signal, and obtain locating information according to described power, phase place and time respectively;
Wherein, described localization process module comprises:
RF power strength detecting device, be connected with described digital base band processor module, for the radiofrequency signal for responding location receiving is detected, obtain its performance number and be sent to described digital base band processor module, described digital base band processor module is further used for calculating the first distance according to described performance number;
Phase detector, be connected with described digital base band processor module, for gathering the phase place that sends the radiofrequency signal for asking location and receive the radiofrequency signal for responding location, output to described digital base band processor module and calculate phase difference value, and described digital base band processor module is further used for calculating second distance according to described phase difference value;
Frequency divider, be connected with described digital base band processor module, for frequency is divided into different brackets, described for asking the radiofrequency signal of location and for responding time of radiofrequency signal of location to measure in the frequency of variant grade, output to described digital base band processor module difference computing time, and described digital base band processor module is further used for, according to described time difference calculating the 3rd distance, then obtaining the final distance of locating information based on the first distance, second distance and the 3rd distance.
As claimed in claim 1 based on radio-frequency (RF) identification for the mobile terminal of locating, characterized by further comprising:
Locating information simulant display model, is connected with described digital base band processor module, for locating information is shown according to planimetric coordinates and three dimensional space coordinate.
As claimed in claim 2 based on radio-frequency (RF) identification for the mobile terminal of locating, characterized by further comprising:
The Subscriber Identity Module of supporting single-wire-protocol, is connected with described radio-frequency (RF) identification analog front-end module, for storing the unique sequence number of radio-frequency (RF) identification; And
Described digital base band processor module, with described radio-frequency (RF) identification analog front-end module, is further used for relatively identifying for radiofrequency signal and the unique sequence number of described radio-frequency (RF) identification identified being demodulated to the described of digital signal.
As claimed in claim 3 based on radio-frequency (RF) identification for the mobile terminal of locating, it is characterized in that described radio-frequency (RF) identification analog front-end module is connected with described baseband processing module by UART Universal Asynchronous Receiver Transmitter interface, and be connected with the pin of described Subscriber Identity Module by signal wire.
As claimed in claim 1 based on radio-frequency (RF) identification for the mobile terminal of locating, it is characterized in that described microwave antenna is for antenna integrated on micro-band or dipole sheet.
As claimed in claim 5 based on radio-frequency (RF) identification for the mobile terminal of locating, characterized by further comprising power management module, be connected with described baseband processing module, localization process module and radio-frequency (RF) identification analog front-end module, for it is powered.
7. the localization method based on radio-frequency (RF) identification, is characterized in that comprising:
The first mobile terminal sends and is used for asking to locate radiofrequency signal;
The first mobile terminal receive that the second mobile terminal returns for responding the radiofrequency signal of location;
The first mobile terminal obtains its corresponding performance number, phase place and time according to described for asking the radiofrequency signal of location and/or responding the radiofrequency signal of locating;
The first mobile terminal obtains locating information according to described power, phase place and time;
Wherein,
Described in described basis, obtaining its corresponding performance number, phase place and time for the radiofrequency signal of the radiofrequency signal of locating and/or response location is specially: by RF power strength detecting device, the radiofrequency signal for responding location receiving is detected, obtain its performance number; By frequency divider, frequency is divided into different brackets, described for asking the radiofrequency signal of location and for responding the time between the radiofrequency signal of location to measure in the frequency of variant grade; Phase place while sending the radiofrequency signal for asking location by phase detector collection and receive the phase place when responding the radiofrequency signal of location;
Describedly obtain locating information according to described power, phase place and time and specifically comprise: digital base band processor module, according to described performance number, is scaled the first distance value according to channel fading model by described performance number; Time difference in the frequency of the described variant grade of described digital base band processor module calculating, and for calculating second distance according to described time difference; Described digital base band processor module is the phase place when asking the radiofrequency signal of location and receive the phase calculation phase difference value when responding the radiofrequency signal of location according to the transmission gathering, and calculates the 3rd distance according to described phase difference value; Obtain the final distance of locating information based on the first distance, second distance and the 3rd distance.
8. the localization method based on radio-frequency (RF) identification as claimed in claim 7, is characterized in that sending and also comprising before asking to locate radiofrequency signal in step:
First mobile terminal to search the second mobile terminal, sends the radiofrequency signal for identifying to it;
The second mobile terminal compares the unique sequence number of radio-frequency (RF) identification of storing for the radiofrequency signal identified and its Subscriber Identity Module receiving, and determines consistent the positioning of the unique sequence number of described identifier and radio-frequency (RF) identification.
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