WO2012079347A1 - 一种基于移动广播的定位方法和装置 - Google Patents

一种基于移动广播的定位方法和装置 Download PDF

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Publication number
WO2012079347A1
WO2012079347A1 PCT/CN2011/075469 CN2011075469W WO2012079347A1 WO 2012079347 A1 WO2012079347 A1 WO 2012079347A1 CN 2011075469 W CN2011075469 W CN 2011075469W WO 2012079347 A1 WO2012079347 A1 WO 2012079347A1
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WIPO (PCT)
Prior art keywords
positioning
signal
mobile broadcast
navigation message
data
Prior art date
Application number
PCT/CN2011/075469
Other languages
English (en)
French (fr)
Inventor
邓中亮
徐连明
余彦培
袁协
那日苏
李合敏
来奇峰
邓耀宇
施浒立
吕子平
Original Assignee
北京邮电大学
北京首科信通科技有限责任公司
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Application filed by 北京邮电大学, 北京首科信通科技有限责任公司 filed Critical 北京邮电大学
Priority to US13/992,449 priority Critical patent/US9572044B2/en
Publication of WO2012079347A1 publication Critical patent/WO2012079347A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • 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
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/0205—Details
    • 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
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/0252—Radio frequency fingerprinting
    • G01S5/02521—Radio frequency fingerprinting using a radio-map
    • 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
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/0257—Hybrid positioning
    • G01S5/0258—Hybrid positioning by combining or switching between measurements derived from different systems
    • G01S5/02585—Hybrid positioning by combining or switching between measurements derived from different systems at least one of the measurements being a non-radio measurement
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a mobile broadcast based positioning method and apparatus. Background technique
  • LBS Location Based Service
  • GIS Geographic Information System
  • LBS Global Positioning System
  • wireless network positioning wireless network positioning
  • hybrid positioning is the combination of the first two positioning methods, and is the most commonly used positioning method today. This is because if GPS receiver positioning is used only, it is generally difficult to receive GPS signals transmitted by satellites in urban areas or buildings, and positioning cannot be achieved.
  • traditional positioning methods there are mainly the following traditional positioning methods:
  • C00 Cel l of Origin
  • E-0TD Enhanced Observed Time Difference
  • the system distributes the reference points over many sites in a wider area and covers the wireless network as a location measurement unit.
  • Each reference point has an accurate clock source.
  • the E-0TD-enabled mobile phone and position measurement unit receive signals from at least 3 base stations, the time difference between each base station reaching the mobile phone and the location measurement unit can be calculated. And thus estimating the location of the mobile phone, this solution is more complicated to implement.
  • A-GPS Assisted GPS
  • the mobile phone of the computing chip calculates the location of the mobile phone according to the GPS positioning data transmitted from the communication network, and the positioning accuracy is within 10 meters.
  • this solution is similar to the E-0TD technology, and the requirements for the network and mobile phones are very high.
  • AOA Angle of Arrive
  • TOA Time of Arrive
  • the AOA positioning technology determines the position of the mobile station based on the signal arrival angle of a mobile station from two base stations.
  • the T0A positioning technique is located by measuring the time that the signal is transmitted from the mobile station and arrives at the message measuring unit.
  • the prior art also provides a positioning method in a mobile communication system, which obtains a set of actual signal parameter information obtained by positioning, a base station identifier corresponding to each actual signal parameter information, and an actual measurement previously stored in different sub-areas.
  • the statistical values of the signal parameters of each group and the base station identifier corresponding to each actual signal parameter information are used to locate the mobile terminal by matching, thereby improving the positioning speed and accuracy.
  • the coverage of the mobile base station signal is insufficient, the accuracy of positioning using the aforementioned method still needs to be improved.
  • communication resources are occupied. Summary of the invention
  • the technical problem to be solved by the present invention is to provide a mobile broadcast-based positioning method and apparatus, which uses a mobile broadcast signal slot header or a transmission frame header to carry a positioning spread spectrum signal, and obtains a positioning feature by demodulating the positioning spread spectrum signal. The parameter is then obtained according to the positioning feature parameter, so that the positioning accuracy can be effectively improved.
  • an embodiment of the present invention provides a mobile broadcast-based positioning method, which includes the following steps: receiving a mobile broadcast signal;
  • the positioning data is acquired according to the positioning feature parameter and the navigation message information.
  • the positioning feature parameter includes the positioning feature parameter including one or more of a signal delay value, a signal delay difference, a signal strength, and a signal arrival angle of each mobile broadcast base station to the terminal.
  • the positioning feature parameter includes a signal delay difference value of each mobile broadcast base station to the terminal
  • the navigation message information further includes a time correction parameter
  • the step of acquiring positioning data according to the positioning feature parameter and the navigation message information The method further includes: correcting the signal delay difference by using the time correction parameter.
  • the step of acquiring the positioning data according to the positioning feature parameter specifically includes: sending the positioning feature parameter and the navigation message information to the network side positioning server, and receiving the number of the positioning returned by the network side positioning server Or the positioning terminal acquires the positioning data by using the feature matching positioning technology; or the positioning terminal acquires the positioning data by using the geometric solution positioning technology, and the navigation message information further includes the location information of the mobile broadcasting base station.
  • the positioning method further comprises: measuring an atmospheric pressure by using an air pressure sensor, calculating an altitude value according to the measured atmospheric pressure, and correcting the obtained positioning data by using the altitude value to obtain final positioning data.
  • the positioning spread spectrum signal is filled in a transmitter identifier of each time slot and a front part of the first synchronization signal; if the mobile broadcast signal is The digital signal broadcast signal is then filled in the zero symbol of each transmission frame.
  • the embodiment of the invention further provides a mobile broadcast based positioning device, which comprises a receiving module, a demodulation module and a positioning data acquisition module.
  • the receiving module is configured to receive a mobile broadcast signal
  • the demodulation module is configured to: demodulate a slot header of the mobile broadcast signal received by the receiving module or a positioning spread spectrum inserted in a transmission frame header
  • the locating data acquisition module is configured to obtain the locating feature information, and the locating data parameter includes a base station identifier of the mobile broadcast base station, where the locating feature parameter corresponds to the base station identifier;
  • the positioning feature parameters acquired by the demodulation module and the navigation message information obtain positioning data.
  • the mobile broadcast-based positioning device further includes a communication module, the communication module is configured to send the positioning feature parameter and the navigation message information acquired by the demodulation module to the network side positioning server, and receive the network The positioning data returned by the side positioning server.
  • the communication module is configured to send the positioning feature parameter and the navigation message information acquired by the demodulation module to the network side positioning server, and receive the network The positioning data returned by the side positioning server.
  • the mobile broadcast-based positioning device further includes a positioning database for correspondingly storing positioning feature parameters and positioning data; and then the positioning data acquiring module searches for the positioning data in the positioning database by using feature matching technology.
  • the mobile broadcast-based positioning device further includes a barometric pressure measurement module and a positioning data correction module, wherein the air pressure measurement module is configured to measure atmospheric pressure; and the positioning data correction module is configured to measure according to the air pressure
  • the atmospheric pressure measured by the module calculates an altitude value, and uses the altitude value to correct the positioning data obtained by the positioning data acquisition module to obtain final positioning data.
  • the technical solution provided by the embodiment of the present invention has the beneficial effects that the mobile broadcast based positioning method and apparatus provided by the embodiment of the present invention use a mobile broadcast signal slot header or a transmission frame header to carry a positioning spread spectrum signal, and demodulate the positioning.
  • the spread spectrum signal acquires a positioning feature parameter, and then acquires positioning data according to the positioning feature parameter. Since the signal coverage of the mobile broadcast system is wide, the positioning of the spread spectrum signal by the mobile broadcast signal can effectively improve the positioning accuracy.
  • the mobile broadcast-based positioning method and device provided by the embodiments of the present invention are compatible with the original mobile broadcast system, and do not affect the function of receiving mobile broadcast of the terminal in the original system, and are easy to implement.
  • FIG. 1 is a flowchart of a mobile broadcast based positioning method according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram showing a frame structure of a CMMB signal in the positioning method shown in FIG. 1;
  • FIG. 3 is a schematic diagram of a method for inserting and positioning a spread spectrum signal in the positioning method shown in FIG. 1;
  • FIG. 4 is a flowchart of a mobile broadcast based positioning method according to another embodiment of the present invention.
  • FIG. 5 is a schematic diagram showing a channel structure of a DAB signal in the positioning method shown in FIG. 4;
  • FIG. 6 is a schematic diagram showing a frame structure of a synchronization channel in FIG. 4;
  • FIG. 7 is a schematic diagram of a method for inserting and positioning a spread spectrum signal in the positioning method shown in FIG. 4;
  • FIG. 8 is a flowchart of a mobile broadcast based positioning method according to another embodiment of the present invention.
  • FIG. 9 is a structural block diagram of a mobile broadcast based positioning apparatus according to still another embodiment of the present invention.
  • FIG. 10 is a structural block diagram of a mobile broadcast based positioning apparatus according to still another embodiment of the present invention. detailed description
  • An embodiment of the present invention provides a mobile broadcast-based positioning method and apparatus, which uses a positioning spread spectrum signal in a frame header of a mobile broadcast signal or a transmission frame header to obtain a positioning feature parameter by demodulating the positioning spread spectrum signal. Then, the positioning data is obtained according to the positioning feature parameter, so that the positioning accuracy can be effectively improved.
  • FIG. 1 is a flowchart of a mobile broadcast-based positioning method according to an embodiment of the present invention.
  • This embodiment uses a CMMB China Mobile Multimedia Broadcasting (China Mobile Multimedia Broadcasting) broadcast signal as an example to describe a mobile broadcast based on an embodiment of the present invention.
  • Positioning method The positioning method of this embodiment includes:
  • Step S101 Receive a CMMB signal.
  • the CMMB receiving antenna can be used for receiving, and then the CMMB signal is processed by using a RAKE receiving equalization estimation technique, which can effectively suppress multipath interference, improve error performance, improve performance of the measurement system, and improve positioning accuracy.
  • Parallel cross-correlation subtraction based on frequency difference factor can also be used to suppress cross-correlation interference.
  • the RAKE reception equalization estimation technique and the frequency difference factor-based parallel cross-correlation subtraction method are well known to those skilled in the art, and a detailed description is omitted here.
  • Step S102 Demodulating a positioning spread spectrum signal inserted in a slot header of the CMMB signal to obtain navigation message information and The measurement obtains the positioning feature parameters.
  • the navigation message information may include a base station ID of the CMMB base station, a city ID, location information of the base station that sends the signal, and the like.
  • the positioning feature parameter may include a signal delay value, a signal delay difference, and a signal strength of each mobile broadcast base station to the terminal. , one or more of the signal arrival angles.
  • the positioning feature parameter of the embodiment includes a signal delay difference and a signal strength of each CMMB base station to the positioning terminal
  • the navigation message information includes a base station ID and a time correction parameter of the mobile broadcast base station, and the time The correction parameter is used to indicate the amount of unsynchronization of the signal time of the different base stations. After obtaining the delay value of the signal, the time delay parameter is used to correct the signal delay difference.
  • the navigation message information spread by the spreading code is filled in the TXID of the CMMB signal (Transmitter)
  • the frame structure of the CMMB signal in this embodiment is as shown in FIG. 2, and each frame (Is) is divided into 40 time slots, and in each time slot (25 ms), the CMMB data segment of the first 136 ⁇ m segment (including 36 ⁇ ) m TXID and 100 ⁇ m sync symbol) Replaced with the Gold code of code length 511 for coarse capture and tracking demodulation. Since the CMMB signal has two sync signals, the insertion of the spread code in the 100 ⁇ period of the first sync signal can still be used for synchronization and channel estimation.
  • the scheme has a TXID segment of 36 ⁇ m and the first sync signal.
  • the 680-bit spreading code is used to modulate the lbit telegram, and the effective spreading gain is at least 27.08 dB, and the amplitude of the positioning spread spectrum signal is the same as the amplitude of the CMMB data subcarrier.
  • the spreading code may be superimposed on the remaining portion of each time slot of the CMMB signal, as shown in Fig. 3.
  • the superimposed spreading code can still adopt the Gold code sequence of the code length 511, except that the 136 ⁇ segment of each time slot is not superimposed, and the remaining CMMB data portions of each time slot are cyclically superimposed with the Gold of the code length 511.
  • the code sequence, and the phase of the superposed code is kept continuous with the phase of the code in the slot header.
  • the superimposed code signal is superimposed on the CMMB data by 20 dB below the CMMB signal energy.
  • the superimposed code signal is 20 dB below the CMMB signal energy to ensure that it does not interfere with the normal reception of the CMMB signal.
  • the spreading code may also be a LAS code or M sequence with a zero cross correlation window greater than 128, and the multiple access interference is suppressed by the cross correlation mitigation algorithm.
  • the position of the slot head may be determined according to the existing system scheme of the CMMB, and then the position-spreading signal inserted in the slot header is captured and demodulated at the slot head position to measure the positioning characteristic signal. After the capture is completed, the continuous superimposed superposition spreading code is used for long-term correlation integration in the tracking state to improve the measurement accuracy and measurement stability of the feature information.
  • Step S103 Acquire positioning data according to the positioning feature parameter and the navigation message information.
  • the feature matching technology is preferably used for positioning, and optionally, the feature matching technology may be adopted.
  • the positioning feature parameter acquires positioning data in a positioning database that is provided by the mobile terminal.
  • the positioning feature parameter may be sent to the network side positioning server, and the network side positioning server searches for the positioning data by using the feature matching technology, and returns the positioning data to the mobile terminal.
  • the feature matching technique is fully disclosed in Chinese Patent Application No. 200910090194.8, which is not described in detail herein. It should be noted that, if the feature matching technology is used for positioning, the positioning feature parameter may further include a delay value of the multipath signal.
  • the multipath signal delay can also be used as the positioning feature parameter. For example: Record the signal main path delay value, multipath signal 1 delay value, multipath signal 2 delay value of a certain position in the database in advance... When the user locates, the measured main path delay value and The multipath signal delay value is compared with the signal main path delay value and the multipath delay at each position recorded in the database. The most similar position is the user's location.
  • the step can also be implemented by a geometric solution positioning technique, in which case the navigation message information includes location information of the CMMB base station.
  • the mobile broadcast-based positioning method provided in this embodiment uses the TXID signal and the first synchronization signal in the CMMB signal slot header to carry the positioning spread spectrum signal, and obtains the navigation message information by demodulating the positioning spread spectrum signal and obtains the positioning by measurement.
  • the feature parameter is then obtained by acquiring positioning data according to the navigation message information and the positioning feature parameter. Since the signal coverage of the CMMB system is wide, the positioning of the spread spectrum signal by the CMMB signal can effectively improve the positioning accuracy. Further, the mobile broadcast-based positioning method and apparatus of the present invention are compatible with the original mobile broadcast system, and do not affect the function of receiving the mobile broadcast of the terminal in the original system, and are easy to implement.
  • FIG. 4 is a flowchart of a mobile broadcast-based positioning method according to another embodiment of the present invention.
  • the positioning method provided by the embodiment of the present invention is described in detail by taking a DAB (Digital Audio Broadcasting) signal as an example.
  • the positioning method of this embodiment includes the following steps:
  • Step S401 Receive a DAB signal.
  • the CMMB signal can be processed by using a RAKE receive equalization estimation technique, which can effectively suppress multipath interference, improve error performance, improve performance of the measurement system, and improve positioning accuracy.
  • Parallel cross-correlation subtraction based on the frequency difference factor can also be used to suppress cross-correlation interference.
  • the RAKE reception equalization estimation technique and the frequency difference factor-based parallel mutual subtraction method are well known to those skilled in the art, and a detailed description is omitted here.
  • Step S402 Demodulate the positioning spread spectrum signal inserted in the transmission frame header of the DAB signal to obtain navigation message information. And the measurement obtains the positioning feature parameters.
  • the navigation message information may include a base station ID of the DAB base station, a city ID, location information of the base station that sends the signal, and the like.
  • the positioning feature parameter includes the positioning feature parameter including a signal delay value of each DAB base station to the terminal, One or more of signal delay difference, signal strength, and signal arrival angle.
  • the positioning feature parameter of the embodiment includes a signal delay difference and a signal strength of each DAB base station to the positioning terminal
  • the navigation message information includes a base station ID and a time correction parameter of the DAB base station.
  • the time correction parameter is used to indicate the amount of out-of-synchronization of the signal time of the different base stations. After acquiring the signal delay value, the time delay parameter is used to correct the signal delay difference.
  • the process of generating the positioning spread spectrum signal in the transmission frame header of the DAB signal in this embodiment is as follows - the channel structure of the DAB is as shown in FIG. 5, which includes a synchronization channel, a fast information channel, and a main traffic channel.
  • the synchronization channel occupies the first two OFDM symbols of each transmission frame in any transmission mode. As shown in FIG. 6, the first OFDM symbol is a zero symbol (NULL) with a duration of TNULL, and the second symbol is persistent.
  • the transmitter of each transmission point transmits the transmitter information data using the code division multiple access method during the zero symbol period.
  • Each transmitter in the SFN (Single Frequency Network) is assigned a unique identifier (ID), and adjacent transmitters are assigned different spread words.
  • ID the unique identifier
  • the spread spectrum word is used to transmit the transmitter.
  • the information data is modulated, it is extended by the cyclic prefix to a length of TNULL, which occupies the zero symbol transmission using the synchronization channel.
  • the two segments can be cyclically filled with a code length of 127Gold code, and the following 78 bits form a 332 code length spreading sequence (the receiver takes 254 bit code correlation demodulation, which can be selected according to the actual situation. Or the 78th bit to do the guard interval, to ensure the complete demodulation of the 254-bit code).
  • 7th order (code length 127) Gold code generation takes the first four.
  • the energy of the zero symbol is adjusted to be 10 dB lower than the energy of the DAB signal.
  • the zero symbol position of the transmission frame header is first determined according to the DAB existing system scheme, and the positioning spread spectrum signal inserted in the slot header is captured and demodulated at the zero symbol position to measure the positioning characteristic signal.
  • Step S403 Acquire positioning data according to the positioning feature parameter and the navigation message information.
  • the feature matching technology may be adopted, and the positioning data is acquired in the positioning database that is provided by the mobile terminal according to the positioning feature parameter.
  • the positioning feature parameter may be sent to the network side positioning server, and the network side positioning server searches for the positioning data by using the feature matching technology to return the positioning data to the mobile terminal.
  • the feature matching technique is fully disclosed in Chinese Patent Application No. 200910090194.8, which is not described in detail herein.
  • this step can also be implemented by a geometric solution positioning technique, in which case the navigation message information must include the location information of the DAB base station.
  • the mobile broadcast based positioning method provided by this embodiment uses zero symbol insertion positioning in the MB signal transmission frame header.
  • the spread spectrum signal obtains the navigation message information by demodulating the positioning spread spectrum signal and obtains the positioning feature parameter, and then acquires the positioning data according to the navigation message information and the positioning feature parameter. Since the signal coverage of the MB system is wide, the positioning of the spread spectrum signal by the MB signal can effectively improve the positioning accuracy.
  • the mobile broadcast-based positioning method and apparatus of the present invention are compatible with the original mobile broadcast system, and do not affect the function of receiving mobile broadcast of the terminal in the original system, and are easy to implement.
  • FIG. 8 is a flowchart of a mobile broadcast based positioning method according to another embodiment of the present invention. As shown in FIG. 8, the mobile broadcast-based positioning method provided in this embodiment includes:
  • Step S801 Receive a mobile broadcast signal.
  • Step S802 Demodulate a slot header of the mobile broadcast signal or a positioning spread spectrum signal inserted in a transmission frame header to obtain navigation message information and obtain a positioning feature parameter.
  • the navigation message information may include a base station ID of the mobile broadcast base station, a city ID, location information of the base station that sends the signal, and the like.
  • the positioning feature parameter may include when the positioning feature parameter includes a signal of each mobile broadcast base station to the terminal. One or more of the delay value, signal delay difference, signal strength, and signal arrival angle.
  • Step S803 Acquire positioning data according to the positioning feature parameter and the navigation message information.
  • Step S804 The atmospheric pressure is measured by using a barometric pressure sensor.
  • Step S805 Calculate an altitude value according to the measured atmospheric pressure, and use the altitude value to correct the positioning data obtained by the positioning data acquiring module to obtain final positioning data.
  • the final positioning data includes horizontal position information and height position information, and achieves positioning in height.
  • the barometric height measurement is based on the principle that the atmospheric pressure decreases with height in the gravitational field and has a certain functional relationship. Therefore, the atmospheric pressure can be measured by using a barometric pressure sensor, and then the altitude value can be calculated based on the relationship between the air pressure and the altitude.
  • the air pressure sensor is used to convert the measured air pressure into an analog voltage signal output.
  • the V/F conversion module converts the analog voltage signal output by the air pressure sensor into a pulse signal with a certain frequency (the frequency of which varies linearly with the input voltage).
  • FIG. 9 is a schematic structural diagram of a mobile broadcast based positioning apparatus according to still another embodiment of the present invention.
  • the mobile broadcast-based positioning apparatus provided in this embodiment includes a receiving module 91, a demodulation module 92, and a positioning data acquiring module 93.
  • the receiving module 91 is a receiving antenna for receiving a mobile broadcast signal, such as a CMMB signal, a DAB signal, and the like.
  • the demodulating module 92 is configured to demodulate a time slot header or a transmission frame header of the mobile broadcast signal received by the receiving module 91. Locating the spread spectrum signal in the middle to obtain the navigation message information and measuring and obtaining the positioning feature parameter;
  • the positioning data obtaining module 93 is configured to obtain positioning data according to the positioning feature parameters and the navigation message information acquired by the demodulation module 92, including an application processor, a coprocessor, and the like.
  • the mobile broadcast based positioning apparatus provided by this embodiment further includes a communication module 94 and a positioning database 95.
  • the communication module 94 is configured to send the positioning feature parameter and the navigation message information acquired by the demodulation module 92 to the network side positioning server, and receive the positioning data returned by the network side positioning server.
  • the location database 95 is configured to store the location feature parameters and the location data correspondingly, and the location data acquisition module 93 can use the feature matching technology to search in the location database 95 to obtain the location data.
  • the receiving module 91 preferably adopts a RAKE receiving equalization estimation technique, and uses a correlation receiver for each path, each related receiver is related to a delayed form of the received signal, and then weights the output of each correlator, and The weighted outputs are summed to form an output to provide signal detection superior to the single correlator, and then the demodulation module 92 performs demodulation and decision based on this.
  • the RAKE receiving equalization estimation technique can effectively utilize multipath components, collect multipath energy, and change the vector sum to algebraic sum, thereby effectively reducing the influence of multipath fading.
  • the mobile broadcast based positioning apparatus provided by the embodiment of the present invention may also only use its own positioning database.
  • the mobile broadcast-based positioning apparatus uses a mobile broadcast signal slot header or a transmission frame header to carry a positioning spread spectrum signal, obtains navigation information information by demodulating the positioning spread spectrum signal, and obtains a positioning feature parameter, and then according to The positioning feature parameter and the navigation message information acquire positioning data. Since the signal coverage of the mobile broadcast system is wide, the positioning of the spread spectrum signal by the mobile broadcast signal can effectively improve the positioning accuracy. Moreover, the mobile broadcast-based positioning apparatus of the present embodiment is compatible with the original mobile broadcast system, and does not affect the function of receiving mobile broadcast reception of the terminal in the original system, and is easy to implement.
  • FIG. 10 is a schematic structural diagram of a mobile broadcast based positioning apparatus according to still another embodiment of the present invention. As shown in FIG.
  • the mobile broadcast-based positioning apparatus includes a receiving module 11, a demodulation module 12, a positioning data acquiring module 13, a communication module 14, a positioning database 15, a barometric pressure measuring module 16, and a positioning data correction module. 17.
  • the receiving module 11 is configured to receive a mobile broadcast signal, such as a CMMB signal, a DAB signal, or the like;
  • the demodulation module 12 is configured to demodulate the slot header of the mobile broadcast signal received by the receiving module 11 or the positioning spread spectrum signal inserted in the transmission frame header to obtain the navigation message information and measure and obtain the positioning feature parameter;
  • the positioning data acquiring module 13 is configured to obtain the positioning data according to the positioning feature parameter acquired by the demodulation module 12, and the communication module 14 is configured to send the positioning feature parameter and the navigation message information acquired by the demodulation module 12 to the network side positioning server, and Receiving positioning data returned by the network side positioning server.
  • the location database 15 is configured to store the location feature parameters and the location data, and the location data acquisition module 13 can use the feature matching technology to search in the location database 15 to obtain the location data.
  • the air pressure measuring module 16 is used for measuring atmospheric pressure
  • the positioning data correction module 17 is configured to calculate an altitude value based on the atmospheric pressure measured by the air pressure measuring module 16, and correct the positioning data obtained by the positioning data acquiring module 13 by using the altitude value to obtain final positioning data.
  • the mobile broadcast-based positioning apparatus uses the mobile broadcast signal slot header or the transmission frame header to carry the positioning spread spectrum signal, obtains the positioning feature parameter by demodulating the positioning spread spectrum signal, and then acquires the positioning by using feature matching technology. data. Since the signal coverage of the mobile broadcast system is wide, the positioning of the spread spectrum signal by the mobile broadcast signal can effectively improve the positioning accuracy. Moreover, the mobile broadcast-based positioning apparatus of the present embodiment is compatible with the original mobile broadcast system, and does not affect the function of receiving mobile broadcast of the terminal in the original system, and is easy to implement. In addition, the altitude positioning information is corrected by the air pressure altimetry module and the positioning data correction module, and the final positioning data obtained includes horizontal positioning information and altitude positioning information, which further improves the positioning accuracy.
  • the mobile broadcast-based positioning device provided by the foregoing embodiment is only illustrated by the division of each functional module. In actual applications, the function distribution may be completed by different functional modules as needed, that is, the device is configured. The internal structure is divided into different functional modules to perform all or part of the functions described above. In addition, the mobile broadcast-based positioning device and the mobile broadcast-based positioning method embodiment are provided in the same embodiment. The specific implementation process is described in the device embodiment, and details are not described herein.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
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  • Position Fixing By Use Of Radio Waves (AREA)

Description

一种基于移动广播的定位方法和装置 本申请要求于 2010年 12月 13日提交中国专利局、 申请号为 201010602341. 8， 发明名 称为 "一种基于移动广播的定位方法和装置" 的中国专利申请的优先权， 其全部内容通过 引用结合在本申请中。 技术领域 说
本发明涉及无线通信领域， 尤其涉及一种基于移动广播的定位方法和装置。 背景技术
LBS ( Location Based Service, 基于位置的服务书） 是通过移动通信网络， 采用无线定 位技术， 结合 GIS (Geographic Information System, 地理信息系统）， 为用户提供基于位 置导航、 查询的一种增值业务， 是空间信息技术与无线通讯技术的结合。 近年来， 无线电 技术和无线局域网技术的进步以及定位服务需求的增加大力推动了定位技术的发展， 人们 对 LBS的需求也与日俱增， 特别是在应对紧急情况时， 定位信息更是显得尤为重要， 因此， 基于 LBS的无线定位应用具有广泛的应用市场。
目前， LBS有三种实现定位的方法： GPS (Global Positioning System, 全球定位系统） 定位、 无线网络定位和混合定位。 其中， 混合定位就是前两种定位方法的结合， 是现今最 常用的定位方法。 这是因为如果仅采用 GPS接收机定位， 在市区或建筑物内一般很难收到 卫星发射的 GPS信号， 无法实现定位。 而对于移动通信领域， 主要有以下几种传统的定位 方式：
C00 ( Cel l of Origin, 蜂窝小区） 定位技术， 其通过采集移动台所处的小区识别号来 确定用户的位置， 这种技术虽然简单但定位精度不高， 难以满足大部分用户的需求。
E-0TD (Enhanced Observed Time Difference, 增强观测时差） 技术， 它通过放置参 考点实现。 系统将参考点分布在较广的区域内的许多站点上， 作为位置测量单元覆盖无线 网络。 每个参考点都有一个精确的时钟源， 当具有 E-0TD功能的手机和位置测量单元接收 到来自至少 3个基站的信号时， 就可以计算出每个基站到达手机和位置测量单元的时间差， 并由此估计出手机的位置， 这种方案实现比较复杂。
A-GPS (Assisted GPS, 辅助 GPS ) 技术， 其通过在卫星信号接收效果较好的位置上设 置若干参考 GPS接收机， 并利用通讯网把接收到的辅助 GPS信号发给手机； 同时配有 GPS 计算芯片的手机根据通讯网传来的 GPS定位数据计算手机位置， 定位精度在 10米以内。 但 这种方案与 E-0TD技术类似， 对网络和手机的要求都很高。
此外， 还有 AOA (Angle of Arrive, 到达角度） 定位技术和 TOA (Time of Arrive, 抵达时间）， AOA定位技术是根据一个移动台距两个基站的信号到达角度， 确定出移动台的 位置。 而 T0A定位技术是通过测量信号从移动台发送出去并到达消息测量单元的时间来定 位。
现有技术还提供了一种移动通信系统中的定位方法， 其通过定位时获得的一组实际信 号参数信息、 每一实际信号参数信息对应的基站标识以及存储的预先在不同子区域中实际 测量到的各组信号参数统计值以及每一实际信号参数信息对应的基站标识， 通过匹配， 对 移动终端进行定位， 提高了定位速度和精度。 然而， 由于移动基站信号覆盖范围不足， 所 以采用前述方法定位的精度仍然有待提高。 此外， 如果大量移动终端都与基站通讯进行定 位则会占用通讯资源。 发明内容
本发明要解决的技术问题在于提供一种基于移动广播的定位方法和装置， 其使用移动 广播信号时隙头或传输帧头携带定位扩频信号， 通过解调所述定位扩频信号获取定位特征 参数， 然后根据所述定位特征参数获取定位数据， 从而可以有效提高定位精度。
为了解决上述技术问题， 本发明实施例提供了一种基于移动广播的定位方法， 其包括 以下步骤- 接收移动广播信号；
解调所述移动广播信号的时隙头或传输帧头中插播的定位扩频信号以获取导航电文信 息并测量获得定位特征参数； 以及
根据所述定位特征参数和导航电文信息获取定位数据。 具体地， 所述定位特征参数包括所述定位特征参数包括各个移动广播基站到终端的信 号时延值、 信号时延差值、 信号强度、 信号到达角度中的一个或多个。
优选地， 所述定位特征参数包括各个移动广播基站到终端的信号时延差值， 所述导航 电文信息还包括时间修正参数， 则在根据所述定位特征参数和导航电文信息获取定位数据 的步骤之前还包括： 采用所述时间修正参数对所述信号时延差值进行修正。
可选地， 根据所述定位特征参数获取定位数据的步骤具体包括： 将所述定位特征参数 和导航电文信息发送给网络侧定位服务器， 以及接收所述网络侧定位服务器返回的定位数 据； 或者定位终端采用特征匹配定位技术获取定位数据； 或者定位终端采用几何解算定位 技术获取定位数据， 则所述导航电文信息还包括移动广播基站的位置信息。
优选地， 所述定位方法还包括： 采用气压传感器测量大气压力， 根据测得的大气压力 计算海拔高度值， 并采用所述海拔高度值对获得的定位数据进行校正以获得最终定位数据。
优选地， 若所述移动广播信号为中国移动多媒体广播信号， 则所述定位扩频信号填充 在每个时隙的发射机标识和第一个同步信号的前部； 若所述移动广播信号为数字信号广播 信号， 则所述定位扩频信号填充在每个传输帧的零符号中。 本发明实施例还提供了一种基于移动广播的定位装置， 其包括接收模块、 解调模块和 定位数据获取模块。 其中， 所述接收模块， 用于接收移动广播信号； 所述解调模块， 用于 解调所述接收模块接收到的所述移动广播信号的时隙头或传输帧头中插播的定位扩频信号 以获取导航电文信息并测量获得定位特征参数， 所述导航电文信息包括移动广播基站的基 站标识， 所述定位特征参数与所述基站标识相对应； 所述定位数据获取模块， 用于根据所 述解调模块获取的定位特征参数和导航电文信息获取定位数据。
优选地， 所述基于移动广播的定位装置还包括通信模块， 所述通信模块， 用于将所述 解调模块获取的定位特征参数和导航电文信息发送给网络侧定位服务器， 以及接收所述网 络侧定位服务器返回的定位数据。
优选地， 所述基于移动广播的定位装置还包括定位数据库， 用于对应存储定位特征参 数和定位数据； 则所述定位数据获取模块采用特征匹配技术在所述定位数据库中查找以获 取定位数据。
优选地， 所述基于移动广播的定位装置还包括气压测量模块和定位数据校正模块， 其 中， 所述气压测量模块， 用于测量大气压力； 所述定位数据校正模块， 用于根据所述气压 测量模块测得的大气压力计算海拔高度值， 并采用所述海拔高度值对所述定位数据获取模 块获得的定位数据进行校正以获得最终定位数据。
本发明实施例提供的技术方案的有益效果是- 本发明实施例提供的基于移动广播的定位方法和装置使用移动广播信号时隙头或传输 帧头携带定位扩频信号， 通过解调所述定位扩频信号获取定位特征参数， 然后根据所述定 位特征参数获取定位数据。 由于移动广播系统的信号覆盖范围广， 所以利用移动广播信号 携带定位扩频信号可以有效提高定位精度。 并且本发明实施例提供的基于移动广播的定位 方法和装置兼容原有移动广播体制， 不影响对于原体制下终端移动广播接收的功能， 易于 实现。 附图说明
为了更清楚地说明本发明实施例中的技术方案， 下面将对实施例描述中所需要使用的 附图作简单地介绍， 显而易见地， 下面描述中的附图仅仅是本发明的一些实施例， 对于本 领域普通技术人员来讲， 在不付出创造性劳动的前提下， 还可以根据这些附图获得其他的 附图。
图 1为本发明一个实施例提供的基于移动广播的定位方法流程图；
图 2为图 1所示定位方法中的 CMMB信号的帧结构示意图；
图 3为图 1所示定位方法中的定位扩频信号插播方式示意图；
图 4为本发明另一实施例提供的基于移动广播的定位方法流程图；
图 5为图 4所示定位方法中的 DAB信号的信道结构示意图；
图 6为图 4中同步信道的帧结构示意图；
图 7为图 4所示定位方法中的定位扩频信号插播方式示意图；
图 8为本发明又一实施例提供的基于移动广播的定位方法流程图；
图 9为本发明又一实施例提供的基于移动广播的定位装置的结构框图；
图 10为本发明又一实施例提供的基于移动广播的定位装置的结构框图。 具体实施方式
为使本发明的目的、 技术方案和优点更加清楚， 下面将结合附图对本发明实施方式作 进一步地详细描述。
本发明实施例提供了一种基于移动广播的定位方法和装置， 其使用移动广播信号帧时 隙头或传输帧头中的定位扩频信号， 通过解调所述定位扩频信号获取定位特征参数， 然后 根据所述定位特征参数获取定位数据， 从而可以有效提高定位精度。
图 1 为本发明一个实施例提供的基于移动广播的定位方法流程图， 本实施例以 CMMB China Mobile Multimedia Broadcasting, 中国移动多媒体广播） 广播信号为例， 详细说 明本发明实施例提供的基于移动广播的定位方法。 本实施例的定位方法包括：
步骤 S101 : 接收 CMMB信号。
具体的，可以采用 CMMB接收天线接收，然后采用 RAKE接收均衡估计技术处理所述 CMMB 信号， 这样可以有效抑制多径干扰， 改善误码性能， 提高测量系统的性能并提高定位精度。 还可以采用基于频差因子的并行互相关减去法抑制互相关干扰。 RAKE接收均衡估计技术和 基于频差因子的并行互相关减去法均为本领域技术人员熟知， 在此省略详细描述。
步骤 S102:解调所述 CMMB信号的时隙头中插播的定位扩频信号以获取导航电文信息并 测量获得定位特征参数。
其中， 导航电文信息可以包括 CMMB基站的基站 ID、 城市 ID、 发出信号的基站的位置 信息等， 定位特征参数可以包括各个移动广播基站到终端的信号时延值、 信号时延差值、 信号强度、 信号到达角度中的一个或多个。 作为本发明的优选实施例， 本实施例的定位特 征参数包括各个 CMMB基站到定位终端的信号时延差值以及信号强度， 该导航电文信息包括 移动广播基站的基站 ID、 时间修正参数， 该时间修正参数用于指示不同基站发送信号时间 的不同步量， 在获取所述信号时延差值以后， 采用时间修正参数对所述信号时延差值进行 修正。
本实施例中 CMMB信号的时隙头中的定位扩频信号可以以如下方式生成：
将采用扩频码扩频后的导航电文信息填充在 CMMB 信号的 TXID ( Transmitter
Identifier, 发射机标识）信号和第一个同步信号的前 102. 2 μ s中， 并将随后 33. 8 μ s作 为保护间隔， 填入扩频码。 本实施例中的 CMMB信号的帧结构如图 2所示， 每帧 （Is )分为 40个时隙， 每个时隙 （25ms ) 中， 前 136 μ m段的 CMMB数据段 （包括 36 μ m TXID和 100 μ m 同步符号） 替换为码长 511的 Gold码， 作为粗捕获及跟踪解调之用。 由于 CMMB信号有 两段同步信号，占用第一个同步信号的 100 μ ιη时间段插入扩频码仍可进行同步与信道估计， 故本方案将 TXID段 36 μ m与第一个同步信号的前 100 μ m进行 CDMA( Code Division Multiple Access,码分多址）定位扩频信号插播，共 136 μ ηι时间，其中前 102. 2 μ m填充 511位 Gold 码， 后 33. 8 μ ιη作为保护间隔， 进行循环填充 169位， 该 680位扩频码调制 lbit电文， 有 效扩频增益至少为 27. 08dB, 定位扩频信号幅度与 CMMB数据子载波的幅度值相同。
进一步地， 还可以在 CMMB信号的每个时隙的剩余部分叠加扩频码， 叠加方式如图 3所 示。 具体的， 叠加扩频码仍可以采用码长 511的 Gold码序列， 除每个时隙头前 136 μ ιη段 不叠加外， 各个时隙的其余 CMMB数据部分均循环叠加该码长 511的 Gold码序列， 且叠加 码相位与时隙头中码相位保持连续。 叠加码信号以低于 CMMB信号能量 20dB方式， 叠加于 CMMB数据之上。叠加码信号以低于 CMMB信号能量 20dB以保证不干扰 CMMB信号的正常接收。
所述扩频码还可以是零互相关窗大于 128的 LAS码或 M序列， 通过互相关减轻算法抑 制多址干扰。
解调定位扩频信号时可先根据 CMMB现有系统方案确定时隙头位置， 再在时隙头位置捕 获并解调插播于时隙头的定位扩频信号， 测量定位特征信号。 捕获完毕后， 在跟踪状态下 利用连续叠加的叠加扩频码进行长时间相关积分， 以提高特征信息测量精度与测量稳定性。
步骤 S103: 根据所述定位特征参数和导航电文信息获取定位数据。
具体地， 优选采用特征匹配技术进行定位， 可选地， 可以采用特征匹配技术， 根据所 述定位特征参数在所述移动终端自带的定位数据库中获取定位数据。 也可以将所述定位特 征参数发送给网络侧定位服务器， 由网络侧定位服务器采用特征匹配技术查找获取定位数 据后， 将定位数据返回给所述移动终端。 所述特征匹配技术在申请号为 200910090194. 8的 中国专利申请中已充分公开， 在此不再详细描述。 需要补充说明的是， 若采用特征匹配技 术进行定位， 则所述定位特征参数还可以包括以及多径信号的时延值。 对于移动广播中所 添加的 CDMA扩频信号， 即定位扩频信号的多径， 当多径时延与主径时延差超过 2个 CDMA 扩频码片时间时， 利用扩频码的自相关特性， 将很可能同时检测出主径时延值与多径信号 时延值。 由于用户位置改变时， 多径信号时延也随之改变， 因此多径信号时延也可作为定 位特征参数。 如： 事先在数据库中记录某一位置的信号主径时延值、 多径信号 1 时延值、 多径信号 2 时延值……当用户定位时， 将测得的主径时延值与多径信号时延值与数据库中 记录的各个位置的信号主径时延值与多径时延进行对比， 结果最相似的位置即为用户所在 位置。 此外， 还可以通过几何解算定位技术来实现该步骤， 在这种情况下， 所述导航电文 信息包括 CMMB基站的位置信息。
本实施例提供的基于移动广播的定位方法使用 CMMB信号时隙头中的 TXID信号和第一 个同步信号携带定位扩频信号， 通过解调所述定位扩频信号获取导航电文信息并测量获得 定位特征参数， 然后根据所述导航电文信息和定位特征参数获取定位数据。 由于 CMMB系统 的信号覆盖范围广， 所以利用 CMMB信号携带定位扩频信号可以有效提高定位精度。 并且本 发明的基于移动广播的定位方法和装置兼容原有移动广播体制， 不影响对于原体制下终端 移动广播接收的功能， 易于实现。 此外， 由于本实施例采用了信号时延差值作为定位特征 参数， 从而消除了终端与基站不同步导致的误差， 而采用时间修正参数对信号时延差值进 行修正可以获得更高的时延特征精度， 进而有效提高定位精度。 图 4 为本发明另一实施例提供的基于移动广播的定位方法流程图， 本实施例以 DAB ( Digital Audio Broadcasting, 数字信号广播） 信号为例详细说明本发明实施例提供的 定位方法。 本实施例的定位方法包括以下步骤：
步骤 S401 : 接收 DAB信号。
具体的， 可以采用 RAKE接收均衡估计技术处理所述 CMMB信号， 这样可以有效抑制多 径干扰， 改善误码性能， 提高测量系统的性能并提高定位精度。 还可以采用基于频差因子 的并行互相关减去法抑制互相关干扰。 RAKE接收均衡估计技术和基于频差因子的并行互相 关减去法均为本领域技术人员熟知， 在此省略详细描述。
步骤 S402: 解调所述 DAB信号的传输帧头中插播的定位扩频信号以获取导航电文信息 并测量获得定位特征参数。
其中， 所述导航电文信息可以包括 DAB基站的基站 ID、 城市 ID、 发出信号的基站的位 置信息等， 所述定位特征参数包括所述定位特征参数包括各个 DAB基站到终端的信号时延 值、 信号时延差值、 信号强度、 信号到达角度中的一个或多个。 作为本发明的优选实施例， 本实施例的定位特征参数包括各个 DAB基站到所述定位终端的信号时延差值以及信号强度， 所述导航电文信息包括 DAB基站的基站 ID、 时间修正参数， 所述时间修正参数用于指示不 同基站发送信号时间的不同步量， 在获取所述信号时延差值以后， 采用所述时间修正参数 对所述信号时延差值进行修正。
本实施例中 DAB信号的传输帧头中的定位扩频信号的生成过程如下所述- DAB的信道结构如图 5所示， 其包括同步信道， 快速信息信道和主业务信道。而同步信 道在任何传输模式中都占用每个传输帧的前两个 OFDM符号， 如图 6所示， 第一个 OFDM符 号是持续时间为 TNULL 的零符号 （NULL ), 第二个符号是持续时间为 Ts 的相位基站符号 (PRS ) o 各个发射点的发射机在零符号期间， 使用码分多址方式发送发射机信息数据。
SFN ( Single Frequency Network, 单频网） 内每台发射机分配唯一的标识 （ID)， 相 邻的发射机分配不同的扩频字， 考虑到多径干扰问题， 釆用扩频字将发射机信息数据调制 后， 通过循环前缀扩展成长度为 TNULL, 占用使用同步信道的零符号传输。 进一步地， 可以 在零符号起始时刻， 采用码长 127Gold码循环填充两段， 以及后面 78位， 构成 332码长扩 频序列 （接收机取 254位码相关解调， 可根据实际情况选取前或后 78位做保护间隔， 保证 254位码完整解调即可）。 7阶 （码长 127) Gold码生成取前四。
为保证接收机有效进行空能量检测以实现 MB信号解调时的同步， 在对零符号调制时 使其能量低于 DAB信号能量 10dB。
解调定位扩频信号时可先根据 DAB现有系统方案确定传输帧头的零符号位置， 再在零 符号位置捕获并解调插播于时隙头的定位扩频信号， 测量定位特征信号。
步骤 S403: 根据所述定位特征参数和导航电文信息获取定位数据。
具体地， 可以采用特征匹配技术， 根据所述定位特征参数在所述移动终端自带的定位 数据库中获取定位数据。 也可以将所述定位特征参数发送给网络侧定位服务器， 由网络侧 定位服务器采用特征匹配技术查找获取定位数据后， 将定位数据返回给所述移动终端。 所 述特征匹配技术在申请号为 200910090194. 8的中国专利申请中已充分公开， 在此不再详细 描述。 此外， 还可以通过几何解算定位技术来实现该步骤， 在这种情况下， 所述导航电文 信息必须包括 DAB基站的位置信息。
本实施例提供的基于移动广播的定位方法使用 MB信号传输帧头中的零符号插播定位 扩频信号， 通过解调所述定位扩频信号获取导航电文信息并测量获得定位特征参数， 然后 根据所述导航电文信息和定位特征参数获取定位数据。 由于 MB系统的信号覆盖范围广， 所以利用 MB信号携带定位扩频信号可以有效提高定位精度。 并且本发明的基于移动广播 的定位方法和装置兼容原有移动广播体制， 不影响对于原体制下终端移动广播接收的功能， 易于实现。 此外， 由于本实施例采用了信号时延差值作为定位特征参数， 从而消除了终端 与基站不同步导致的误差， 而采用时间修正参数对信号时延差值进行修正可以获得更高的 时延特征精度， 进而有效提高定位精度。 图 8为本发明又一实施例提供的基于移动广播的定位方法流程图。 如图 8所示， 本实 施例提供的基于移动广播的定位方法包括：
步骤 S801 : 接收移动广播信号。
步骤 S802 : 解调所述移动广播信号的时隙头或传输帧头中插播的定位扩频信号以获取 导航电文信息并测量获得定位特征参数。
其中， 所述导航电文信息可以包括移动广播基站的基站 ID、 城市 ID、 发出信号的基站 的位置信息等， 所述定位特征参数可以包括所述定位特征参数包括各个移动广播基站到终 端的信号时延值、 信号时延差值、 信号强度、 信号到达角度中的一个或多个。
步骤 S803: 根据所述定位特征参数和导航电文信息获取定位数据。
具体地， 该步骤可以通过与步骤 S 103和步骤 S403相同的方式实现， 在此不再赘述。 步骤 S804: 采用气压传感器测量大气压力。
步骤 S805 : 根据测得的大气压力计算海拔高度值， 并釆用所述海拔高度值对所述定位 数据获取模块获得的定位数据进行校正以获得最终定位数据。
其中， 该最终定位数据包括水平位置信息与高度位置信息， 实现了高度上的定位。 气压测高是根据在重力场内， 大气压力随高度增加而减小,并有确定的函数关系的原理 工作的。 因此， 可以通过使用气压传感器来测量大气压力， 然后根据气压与海拔高度的关 系， 计算出海拔高度值。 测量时气压传感器用来将被测气压转换为模拟电压信号输出， 经 过 V/F转换模块把气压传感器输出的模拟电压信号转换成具有一定频率的脉冲信号 （其频 率随输入电压呈线性变化）。 通过单片机接收该脉冲信号， 得到单位时间内获得的脉冲数， 依据电压与频率的线性关系式计算出所对应的实际气压值， 之后经过数据处理给出高度指 示， 实现高层上的区分。 最后， 根据广播定位坐标、 伪距和气压测高计的数值进行用户位 置计算， 进一步提高室内复杂定位的精度。 图 9为本发明又一实施例提供的基于移动广播的定位装置的结构示意图。 如图 9所示， 本实施例提供的基于移动广播的定位装置包括接收模块 91、解调模块 92和定位数据获取模 块 93。
其中， 接收模块 91为接收天线， 用于接收移动广播信号， 如 CMMB信号、 DAB信号等； 解调模块 92，用于解调接收模块 91接收到的移动广播信号的时隙头或传输帧头中插播 的定位扩频信号以获取导航电文信息并测量获得定位特征参数；
定位数据获取模块 93，用于根据解调模块 92获取的定位特征参数和导航电文信息获取 定位数据， 包括应用处理器和协处理器等。
进一步地， 本实施例提供的基于移动广播的定位装置还包括通信模块 94和定位数据库 95。
通信模块 94，用于将解调模块 92获取的定位特征参数和导航电文信息发送给网络侧定 位服务器， 以及接收网络侧定位服务器返回的定位数据。
定位数据库 95， 用于对应存储定位特征参数和定位数据， 则定位数据获取模块 93可以 采用特征匹配技术在定位数据库 95中查找以获取定位数据。
其中， 接收模块 91优选采用 RAKE接收均衡估计技术， 对每个路径使用一个相关接收 机， 各相关接收机与被接收信号的一个延迟形式相关， 然后对每个相关器的输出进行加权， 并把加权后的输出相加合成一个输出， 以提供优于单路相关器的信号检测， 然后解调模块 92在此基础上进行解调和判决。 可见， RAKE接收均衡估计技术可以有效地利用多径分量， 把多径能量收集起来， 变矢量和为代数和， 从而有效减小多径衰落的影响。
显然， 本发明实施例提供的基于移动广播的定位装置也可以仅通过自身的定位数据库
95査找定位数据， 或者仅通过网络侧定位服务器获取定位数据。
本实施例提供的基于移动广播的定位装置使用移动广播信号时隙头或传输帧头携带定 位扩频信号， 通过解调所述定位扩频信号获取导航电文信息并测量获得定位特征参数， 然 后根据所述定位特征参数和导航电文信息获取定位数据。 由于移动广播系统的信号覆盖范 围广， 所以利用移动广播信号携带定位扩频信号可以有效提高定位精度。 并且本实施例的 基于移动广播的定位装置兼容原有移动广播体制， 不影响对于原体制下终端移动广播接收 的功能， 易于实现。 图 10为本发明又一实施例提供的基于移动广播的定位装置的结构示意图。 如图 10所 示， 本实施例提供的基于移动广播的定位装置包括接收模块 11、 解调模块 12、 定位数据获 取模块 13、 通信模块 14、 定位数据库 15、 气压测量模块 16和定位数据校正模块 17。 其中， 接收模块 11， 用于接收移动广播信号， 如 CMMB信号、 DAB信号等；
解调模块 12，用于解调接收模块 11接收到的移动广播信号的时隙头或传输帧头中插播 的定位扩频信号以获取导航电文信息并测量获得定位特征参数；
定位数据获取模块 13， 用于根据解调模块 12获取的定位特征参数获取定位数据； 通信模块 14，用于将解调模块 12获取的定位特征参数和导航电文信息发送给网络侧定 位服务器， 以及接收所述网络侧定位服务器返回的定位数据。
定位数据库 15， 用于对应存储定位特征参数和定位数据， 则定位数据获取模块 13可以 采用特征匹配技术在定位数据库 15中査找以获取定位数据。
气压测量模块 16， 用于测量大气压力；
定位数据校正模块 17， 用于根据气压测量模块 16测得的大气压力计算海拔高度值， 并 采用海拔高度值对定位数据获取模块 13获得的定位数据进行校正以获得最终定位数据。
由于本实施例提供的基于移动广播的定位装置使用移动广播信号时隙头或传输帧头携 带定位扩频信号， 通过解调所述定位扩频信号获取定位特征参数， 然后通过特征匹配技术 获取定位数据。 由于移动广播系统的信号覆盖范围广， 所以利用移动广播信号携带定位扩 频信号可以有效提高定位精度。 并且本实施例的基于移动广播的定位装置兼容原有移动广 播体制， 不影响对于原体制下终端移动广播接收的功能， 易于实现。 此外， 通过气压测高 模块和定位数据校正模块来进行高度定位信息校正， 获得的最终定位数据包括水平定位信 息和高度定位信息， 进一步提高了定位精度。 需要说明的是： 上述实施例提供的基于移动广播的定位装置仅以上述各功能模块的划 分进行举例说明， 实际应用中， 可以根据需要而将上述功能分配由不同的功能模块完成， 即将装置的内部结构划分成不同的功能模块， 以完成以上描述的全部或者部分功能。 另外， 上述实施例提供的基于移动广播的定位装置和基于移动广播的定位方法实施例属于同一构 思， 其具体实现过程详见装置实施例， 这里不再赘述。
本领域普通技术人员可以理解上述实施例方法中的全部或部分步骤可以通过程序 来指令相关的硬件完成，所述的程序可以存储于一种计算机可读取的存储介质中，存储 介质例如： 计算机中的硬盘、 光盘或软盘。
以上所述仅为本发明的优选实施例， 并非因此限制本发明的专利范围， 凡是利用本发 明说明书及附图内容所作的等效结构或等效流程变换， 或直接或间接应用在其他相关的技 术领域， 均同理包括在本发明的专利保护范围内。

Claims

权 利 要 求 书
1. 一种基于移动广播的定位方法， 其特征在于， 包括- 接收移动广播信号；
解调所述移动广播信号的时隙头或传输帧头中插播的定位扩频信号以获取导航电文信息 并测量获得定位特征参数， 所述导航电文信息包括移动广播基站的基站标识， 所述定位特征 参数与所述基站标识相对应； 以及
根据所述定位特征参数和导航电文信息获取定位数据。
2. 根据权利要求 1所述的定位方法， 其特征在于， 所述定位特征参数包括各个移动广播 基站到终端的信号时延值、 信号时延差值、 信号强度、 信号到达角度中的一个或多个。
3. 根据权利要求 2所述的定位方法， 其特征在于， 所述定位特征参数包括各个移动广播 基站到终端的信号时延差值， 所述导航电文信息还包括时间修正参数， 则在根据所述定位特 征参数和导航电文信息获取定位数据的步骤之前还包括：
釆用所述时间修正参数对所述信号时延差值进行修正。
4. 根据权利要求 1-3任一项所述的定位方法， 其特征在于， 根据所述定位特征参数和导 航电文信息获取定位数据的步骤具体包括：
将所述定位特征参数和导航电文信息发送给网络侧定位服务器， 以及接收所述网络侧定 位服务器返回的定位数据； 或者定位终端采用特征匹配定位技术获取定位数据； 或者定位终 端采用几何解算定位技术获取定位数据， 则所述导航电文信息还包括移动广播基站的位置信 息。
5. 根据权利要求 1-3任一项所述的定位方法， 其特征在于， 还包括：
采用气压传感器测量大气压力， 根据测得的大气压力计算海拔高度值， 并采用所述海拔 高度值对获得的定位数据进行校正以获得最终定位数据。
6. 根据权利要求 1-3任一项所述的定位方法， 其特征在于， 若所述移动广播信号为中国 移动多媒体广播信号， 则所述定位扩频信号填充在每个时隙的发射机标识和第一个同步信号 的前部； 若所述移动广播信号为数字信号广播信号， 则所述定位扩频信号填充在每个传输帧的零 符号中。
7. 一种基于移动广播的定位装置， 其特征在于， 包括：
接收模块， 用于接收移动广播信号；
解调模块， 用于解调所述接收模块接收到的所述移动广播信号的时隙头或传输帧头中插 播的定位扩频信号以获取导航电文信息并测量获得定位特征参数， 所述导航电文信息包括移 动广播基站的基站标识， 所述定位特征参数与所述基站标识相对应； 以及
定位数据获取模块， 用于根据所述解调模块获取的定位特征参数和导航电文信息获取定 位数据。
8. 根据权利要求 7所述的定位装置， 其特征在于， 还包括通信模块， 用于将所述解调模 块获取的定位特征参数发和导航电文信息送给网络侧定位服务器， 以及接收所述网络侧定位 服务器返回的定位数据。
9. 根据权利要求 7所述的定位装置， 其特征在于， 还包括定位数据库， 用于对应存储定 位特征参数和定位数据； 所述定位数据获取模块采用特征匹配技术在所述定位数据库中查找 以获取定位数据。
10. 根据权利要求 7-9任一项所述的定位装置， 其特征在于， 还包括：
气压测量模块， 用于测量大气压力； 以及
定位数据校正模块， 用于根据所述气压测量模块测得的大气压力计算海拔高度值， 并采 用所述海拔高度值对所述定位数据获取模块获得的定位数据进行校正以获得最终定位数据。
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