WO2000031561A1 - Positioning system, positioning method and positioning device - Google Patents

Positioning system, positioning method and positioning device Download PDF

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Publication number
WO2000031561A1
WO2000031561A1 PCT/JP1999/006479 JP9906479W WO0031561A1 WO 2000031561 A1 WO2000031561 A1 WO 2000031561A1 JP 9906479 W JP9906479 W JP 9906479W WO 0031561 A1 WO0031561 A1 WO 0031561A1
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WO
WIPO (PCT)
Prior art keywords
data
radio
station
positioning
call
Prior art date
Application number
PCT/JP1999/006479
Other languages
French (fr)
Inventor
Takeshi Ito
Masaharu Yoshimori
Eiji Kawai
Original Assignee
Sony Computer Entertainment Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sony Computer Entertainment Inc. filed Critical Sony Computer Entertainment Inc.
Priority to BR9907721-3A priority Critical patent/BR9907721A/en
Priority to CA002318628A priority patent/CA2318628A1/en
Priority to AU11843/00A priority patent/AU1184300A/en
Priority to EP99972742A priority patent/EP1057042A1/en
Priority to KR1020007007687A priority patent/KR20010034078A/en
Publication of WO2000031561A1 publication Critical patent/WO2000031561A1/en

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Classifications

    • 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
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
    • G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/40—Correcting position, velocity or attitude
    • G01S19/41—Differential correction, e.g. DGPS [differential GPS]
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
    • G01C21/20—Instruments for performing navigational calculations
    • G01C21/206—Instruments for performing navigational calculations specially adapted for indoor navigation
    • 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
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/03—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
    • G01S19/10—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing dedicated supplementary positioning signals
    • G01S19/12—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing dedicated supplementary positioning signals wherein the cooperating elements are telecommunication base stations
    • 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
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
    • G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/42—Determining position
    • G01S19/45—Determining position by combining measurements of signals from the satellite radio beacon positioning system with a supplementary measurement
    • G01S19/46—Determining position by combining measurements of signals from the satellite radio beacon positioning system with a supplementary measurement the supplementary measurement being of a radio-wave signal type
    • 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
    • G01S5/0009—Transmission of position information to remote stations
    • G01S5/0045—Transmission from base station to mobile station
    • G01S5/0054—Transmission from base station to mobile station of actual mobile position, i.e. position calculation on base station

Definitions

  • the present invention concerns a positioning system, positioning method, and positioning device to measure the current position of the device. Background of the invention
  • GPS Global Positioning System
  • positioning errors are corrected and positioning accuracy is improved by making use of a relative positioning method (differential GPS or DGPS).
  • DGPS relative positioning method
  • positioning errors are corrected by sending out correction data to a GPS receiver from a transmitting station using FM-multiplex broadcasting.
  • FM-multiplex broadcasting uses a bandwidth around 80 MHz, it becomes necessary to lengthen the antenna, which is a disadvantage from the standpoint of portability.
  • GPS's reception sensitivity is not good underground or inside a building. In general, it cannot receive FM-multiplex data when located underground or inside a building.
  • a positioning system of the present invention has, in order to solve the above- noted problems, a radio call base-station, a receiving means to receive data sent from the radio-call base-station, and a positioning device equipped with a positioning means to obtain position data indicating the current position of the device based on data sent from the radio-call base-station.
  • a positioning device obtains position data indicating the current position of the device based on the data sent from the radio-call base-station, using a positioning means.
  • a positioning device can obtain position data as long as it can receive data from the radio-call base-station.
  • the positioning method of the present invention enables one to obtain the position data showing the current position of the device based on data sent from the radio-call base-station in order to solve the above-noted problems.
  • the positioning method enables one to obtain position data as long as the data from the radio-call base-station can be received.
  • the positioning device of the present invention is equipped with a receiving means that receives data sent from the radio-call base-station and a positioning means that obtains position data showing the current position of the device based on data sent from the radio-call base-station in order to solve the above-discussed problems.
  • a positioning device having such a configuration obtains position data indicating the current position of the device based on data sent from the radio-call base- station by means of the positioning means.
  • the positioning device enables one to obtain position data as long as the data from the radio-call base-station can be received.
  • the positioning system of the present invention comprises, a radio-call base- station equipped with a position-correction-data-generating means that generates position-correction data to correct the position data that the positioning device obtained by measuring positions and a transmission means to send data to the positioning device. Also, the positioning system of the present invention has a positioning device equipped with a receiving means to receive data sent from the radio-call base-station, a positioning means that obtains position data by measuring the current position of the device based on the signals sent from an artificial satellite, and a position-data- correction means that corrects the position data based on the position-correction data received by the receiving means.
  • the radio-call base-station sends out position-correction data generated by a position-correction-data-generating means to the positioning device, using the transmission means.
  • the position data obtained by measuring the current position of the device based on the signals sent from the artificial satellites by the positioning means are corrected by the position-data-correction means using the position-correction data received by the receiving means.
  • the positioning device corrects the position data using the position-correction data sent from a radio-call base-station that covers a relatively narrow service area, data generated at said radio-call base-station.
  • the position data obtained upon measuring the current position of the device based on signals sent from artificial satellites are corrected using the position-correction data sent from the radio-call base station.
  • the position data are corrected using the position-correction data sent from a radio-call base-station that services a relatively narrow service area, data generated at said radio-call base-station.
  • Figure 1 is a block diagram that shows a positioning system in the form in which the present invention is actually applied.
  • Figure 2 is a flowchart showing the processing sequence that a portable terminal or device executes to obtain position data in a positioning system.
  • a portable terminal that is a positioning device, carries out an application program based on the position data obtained by the positioning system after measuring positions.
  • the positioning system includes a base station 2 that broadcasts data, a portable terminal 3 that receives data from the base station 2, and GPS (Global Positioning System) satellites 4, 5, 6, and 7 that send to the base station 2 and the portable terminal 3 signals for measuring positions.
  • GPS Global Positioning System
  • the portable terminal 3 receives as information concerning the terminal's current position primary position data based on data sent from the base station 2 and secondary position data obtained by making use of satellite signals from GPS satellites 4, 5, 6, and 7 (hereafter called GPS signals).
  • the base station 2 includes a GPS standard receiver 11 that is a position-correction-data-generating means that generates position-correction data to correct the secondary position data and a radio-call base-station 12 that sends data to the portable terminal 3.
  • a GPS standard receiver 11 that is a position-correction-data-generating means that generates position-correction data to correct the secondary position data
  • a radio-call base-station 12 that sends data to the portable terminal 3.
  • the portable terminal 3 is equipped with a radio-call-reception part 13 having a radio-call reception function that is a reception function to receive data sent from base station 2 and a positioning function that obtains the primary position data showing the current position of the terminal based on data sent from the base station 2, a GPS-reception part 14 having a positioning function that obtains the secondary position data after measuring the current position of the terminal based on the signals sent from GPS satellites 4, 5, 6, and 7, and a position-data-correction function that corrects the secondary position data using the position-correction data sent from the base station 2, and an information- processing part 15 having a function of performing information processing using the position data obtained by the radio-call-reception part 13 and the GPS-reception part 14.
  • the base station 2 is composed of a GPS standard receiver 11 and a radio-call base-station 12.
  • the GPS standard receiver 11 on receiving GPS signals from GPS satellites 4, 5, 6, and 7, obtains information about its own position and generates position-correction data.
  • the GPS standard receiver 11 generates position-correction data by using, for example, a relative positioning method (differential GPS or DGPS).
  • the GPS standard receiver 11 that is located at the reference point whose position is accurately known, measures position based on the GPS signals sent from GPS satellites 4, 5, 6, 7, using a GPS receiver. This reference point's position and the position data measured by the GPS receiver are collated and compared at the GPS standard receiver 11. After this collation and comparison, the error component contained in the GPS signals caused by the SA (Selective Availability), the satellites system and the transmission medium is detected at the GPS standard receiver 11. This error component that is detected is called the position-correction data.
  • SA Selective Availability
  • the portable terminal 3 obtains corrected position data by deducting this error component (the position-correction data) from the position data it obtained by measuring its position. Also, it can be said that one can improve the positioning accuracy if the distance from the reference point is small, but the effect of the correction decreases as one moves farther away from the reference point.
  • Position-correction data generated at the GPS standard receiver 11 are sent to a portable terminal 3 by the radio-call base-station 12.
  • the radio-call base-station 12 is a data-transmission station that sends data to the portable terminal 3, and is composed as a data-transmission station in a so-called radio- call system.
  • the base station 2 is created by having this traditional radio-call base- station 12 equipped with a GPS standard receiver 11.
  • This radio-call base station 12 is made in a way that it sends out various kinds of information to information-receiving terminals such as "pocket-bell" pagers or pager receivers.
  • the radio-call base-station 12 is, for example, a data- transmission station that sends to information-receiving terminals such as pager data from senders transmitted from a public-telephone network via a radio-call central station.
  • the radio-call system has been used to deliver various kinds of information such as weather forecasts and information on events to users.
  • this radio-call base-station 12 is relatively narrow and is supposed to be narrower than a broadcasting area of a FM-multiplex-broadcasting station, for example.
  • the radio-call base-station 12 sends area data made up of information showing its own location to the portable terminal 3.
  • the base station 2 by virtue of being equipped with the GPS standard receiver 11 and the radio-call base-station 12 as described above, sends position-correction data to correct the position data to the portable terminal 3, making use of the radio-call system.
  • position-correction data these are sent, in concrete terms, included with various kinds of information.
  • a number of such base stations 2 exist in a positioning system, and each base station 2 sends position-correction data obtained on its own to the portable terminals 3 found in the service area.
  • the radio-call-reception part 13 of portable terminal 3 is made as a receiving means to receive data sent from base station 2.
  • the radio-call-reception part 13 receives the data sent by radio from the base station 2 using antenna 16.
  • the radio-call-reception part 13 also receives position-correction data sent from the base station 2.
  • the position-correction data received by the radio-call-reception part 13 are output to the GPS-reception part 14.
  • the radio-call-reception part 13 is made such that it can obtain the approximate current position of the portable terminal 3 based on the area data sent from the base station 2.
  • the radio-call-reception part 13 measures the current position on its own using this, without using GPS signals.
  • the radio-call-reception part 13 obtains as the primary position data its own approximate current position from the area data showing the position of the base station 2 sent from the base station.
  • the portable terminal 3 located in the service area recognizes as its own current position the location of base station 2.
  • the primary position data obtained by this radio-call reception part 13 are output to the information-processing part 15.
  • the GPS-reception part 14 measures the current position on receiving via antenna 17 the GPS signals sent from GPS satellites 4, 5, 6, and 7, and obtains position data.
  • the GPS-reception part 14 corrects the secondary position data when the radio- call reception-part 13 is receiving position-correction data sent from the base station 2 using these data. And the GPS-reception part 14 outputs the secondary position data thus obtained to the information-processing part 15.
  • the radio-call-reception part 13 described above also has a function to automatically switch the reception frequency, using the secondary position data. According to this, the radio-call-reception part 13, when it has moved to a service area with a different reception frequency, automatically changes the reception frequency, using the secondary position data.
  • the information-processing part 15 has a function to execute application programs.
  • the information-processing part 15 executes this program using the position data obtained by the radio-call-reception part 13 and the GPS-reception part 14 via the operation described above. In other words, for example, the information-processing part 15 displays in images the current position of the device on the map based on the primary or secondary position data.
  • the position data are, as described above, either the primary position data, data that indicate the approximate current position of the device, that radio-call-reception part 13 obtained from the data sent from the base station 2 or the secondary position data that the GPS-reception part 14 obtained on measuring the position using the GPS signals sent from GPS satellites 4, 5, 6, and 7. Therefore, the information-processing part 15, for example, normally prefers to use the secondary- position data whose positioning accuracy is higher over the other data to execute programs.
  • a portable terminal 3 having the above-described composition executes a map- display software program using data sent from the base station 2 or the position data obtained using the GPS signals sent from GPS satellites 4, 5, 6, and 7.
  • Figure 2 shows a sequence of processes the portable terminal 3 executes in order to obtain position data. More specifically, it shows a sequence of processes starting from a search for a desired GPS satellite.
  • a portable terminal 3 begins the operation of measuring positions.
  • the portable terminal 3 starts a sequence of processes to obtain position data.
  • the portable terminal 3 discriminates whether it is possible to receive radio transmissions. For example, the portable terminal 3 makes this determination by detecting whether or not data have been received from the base station 2. If the reception of radio transmission is possible, the portable terminal 3 proceeds to step S3. If that reception is not possible, the portable terminal 3 proceeds to step S7.
  • the portable terminal 3 determines whether or not GPS satellites have been found by search for GPS satellites. If GPS satellites have been found, the portable terminal 3 proceeds to step S8, executes positioning on its own using the GPS signals, and obtains the secondary position data. On the other hand, when GPS satellites have not been found, the portable terminal 3 proceeds to step S9, executes a not-possible-to-execute-positioning process - for example, an error process - and terminates this positioning process.
  • the portable terminal 3 tries to obtain the area data of the base station 2. For example, it obtains the secondary position data made of the area data sent from the base station 2. Based on these area data, the portable terminal 3 searches for GPS satellites and determines, at step S4, whether GPS satellites have been found. When GPS satellites have been found, the portable terminal 3 proceeds to step S5, and when GPS satellites have not been found, it proceeds to step S10.
  • the portable terminal 3 obtains as a result of measuring positions the area data of the base station 2.
  • the portable terminal 3 determines whether there exist DGPS data (position-correction data) from radio-call base-station 12. For example, the portable terminal 3 determines whether position-correction data are stored in the data sent from the base station 2. If DGPS data exist, the portable terminal 3 obtains the position using those DGPS data - in other words, the secondary position data corrected by the position- correction data. When DGPS data do not exist, the portable terminal 3 proceeds to step Sll, executes positioning on its own using the GPS signals, and obtains the secondary position data.
  • DGPS data position-correction data
  • the portable terminal 3 obtains position data.
  • the portable terminal 3 obtains position data based on the GPS signals sent from GPS satellites at step Sll, and in the case where DGPS data have been received from the base station 2, it corrects the position data using these DGPS data at step S6. Also, when it is not possible to find GPS satellites, the portable terminal 3 obtains position data based on the area data of the base station 2 at step S10.
  • the portable terminal 3 obtains position data by searching for GPS satellites and receiving GPS signals at step S8.
  • the portable terminal 3 uses the position data that it obtained through such processes as data for executing application programs.
  • the positioning system is composed of the component parts as described above. By organizing the positioning system in such a way, the following is made possible:
  • the portable device 3 can measure a position based on data sent from the base station 2 by utilizing a radio-calling system. By this means, the portable terminal 3 can obtain information on its approximate current position based on data sent from the base station 2, even if it is found at a place where it cannot directly receive radio waves from the GPS satellites such as in an underground center or inside a building, as long as it can make use of a radio-calling system.
  • the portable terminal 3 can determine its approximate current position as the primary position data based on the data from the base station 2, the time needed to search for GPS satellites can be reduced even in such cases.
  • the portable terminal 3 when measuring a position using GPS satellites, the portable terminal 3 corrects the error in the GPS signals sent from satellites, using the position-correction data sent from the radio-call base-station. Through this means, more accurate position data can be obtained.
  • the portable terminal 3 can automatically switch frequencies from the base station 2, which are different for each radio-call area, using the positions measured by means of GPS satellites, it becomes possible to automatically select radio-calling by area. For example, the portable terminal 3 can receive data from the base station, even when it has been moved to a neighboring service area without having the user adjust it manually. Also, since radio-call base-stations 12 - in other words, a base station made by installing a GPS standard receiver 11 in a radio-call base-station 12 - exist in relatively large numbers, it becomes possible, in general, to offer a position-correction system the accuracy of which is higher than that of a position-correction system that makes use of FM-multiplex broadcasting. In other words, by having each base station 2 covering a relatively small service area generate position-correction data, the position data obtained at the portable terminal 3 using said position-correction data become information that indicates accurately the current position of the terminal.
  • the base station 2 can be made by simply adding a GPS standard receiver 11 to an existing radio-call base-station 12, one can easily build an infrastructure, which is simpler than making a new network.
  • the positioning system is not limited to a structure made by using four GPS satellites. Such system can be built using more than five GPS satellites.
  • position- correction data are generated by installing the GPS standard receiver 11 at each base station 2, it is possible, for example to generate position-correction data at the central station created to control data for the base stations 2.
  • the position-correction data generated at the GPS standard receiver 11 installed at the central station are sent to each base station. And these position-correction data sent from the central station are corrected further at each base station in consideration of the location of each base station and are sent to portable terminals 3.
  • correcting position- correction data in view of the difference in location of each base station it can be done at the central station in advance for each base station, and these corrected data can be sent to each base station.
  • the positioning system of the present invention has a radio-call base-station that transmits data and a positioning device equipped with a receiving means to receive data sent from a radio-call base-station and a positioning means to obtain position data indicating the current position of the device based on data sent from a radio-call base- station.
  • a positioning device can obtain, through the positional means, position data indicating the current position of the device based on data sent from a radio-call base- station.
  • a positioning device can obtain position data as long as it can receive data from a radio-call base-station.
  • position data indicating the current position of the device based on data sent from a radio-call base-station
  • position data can be obtained as long as data from a radio-call base-station can be received.
  • the positioning device of the present invention by being equipped with a receiving means to receive data sent from a radio-call base-station and a positioning means to obtain position data indicating the current position of the device based on data sent from a radio-call base-station, can obtain position data indicating the current position of the device based on data sent from a radio-call base-station by the positioning means.
  • the positioning device can obtain position data as long as it can receive data from a radio-call base-station.
  • the positioning system of the present invention also comprises a position- correction-data-generating means that generates position-correction data to correct the position data obtained by the positioning device on measuring a relevant position and a radio-call base-station equipped with a transmission means to send data to the positioning device.
  • a positioning system of the present invention also has a positioning device equipped with a receiving means to receive data sent from a radio-call base- station, a positioning means to obtain position data on measuring the current position of the device based on signals sent from artificial satellites, and a position-data-correction means to correct the position data based on the position-correction data received by a receiving means.
  • the radio-call base-station can send position-correction data generated by the position-correction-data- generating means to a positioning device using a transmission means, and the positioning device can correct, via the position-data-correction means, the position data, obtained by measuring the current position of the device based on signals sent from artificial satellites by the positioning means, using the position-correction data received by the receiving means.
  • the positioning device can correct position data using position-correction data - data generated at the radio-call base-station - sent from said radio-call base-station covering a relatively narrow service area, the accuracy of position data can be improved.
  • position data obtained by measuring the current position of the device based on signals sent from artificial satellites using the position-correction data sent from a radio- call base-station
  • position data can be corrected using the position-correction data - data generated at the radio-call base-station - sent from said radio-call base-station covering a relatively narrow service area, which makes it possible to improve the accuracy of position data.

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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Automation & Control Theory (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Navigation (AREA)

Abstract

A positioning system for obtaining information concerning a current position of a device even when one is in an underground center or inside a building includes a portable terminal which is equipped with a radio-call-reception part having a radio-call-reception function that is a receiving unit which receives data sent from the base station and a positioning function to obtain the primary position data indicating the current position of the device based on data sent from the base station, a GPS-reception part having a positioning function to obtain the secondary position data on measuring the current position of the device based on signals sent from GPS satellites, and a position-data-correction function to correct the secondary position data using the position-correction data sent from the base station, and an information-processing part having a function to perform information processing using position data obtained from the radio-call-reception part and the GPS-reception part.

Description

DESCRIPTION
POSITIONING SYSTEM, POSITIONING METHOD AND POSITIONING
DEVICE
BACKGROUND OF THE INVENTION Field of the Invention
The present invention concerns a positioning system, positioning method, and positioning device to measure the current position of the device. Background of the invention
Recently, it became possible to use artificial satellites for navigation, and a GPS (Global Positioning System) that makes navigation possible not only for ships but also for cars and people when suitable devices are carried with them has been offered. Economy, safety, and convenience, while travelling towards a destination, are improved by this navigation system.
In addition, in the GPS, positioning errors are corrected and positioning accuracy is improved by making use of a relative positioning method (differential GPS or DGPS). In general, in a differential GPS, positioning errors are corrected by sending out correction data to a GPS receiver from a transmitting station using FM-multiplex broadcasting.
However, a navigation system using FM-multiplex broadcasting with a differential GPS has the problem described below.
First of all, since FM-multiplex broadcasting uses a bandwidth around 80 MHz, it becomes necessary to lengthen the antenna, which is a disadvantage from the standpoint of portability.
Also, since one broadcasting station covers a very wide area, there is a limit to the correction of positioning errors. In addition, GPS's reception sensitivity is not good underground or inside a building. In general, it cannot receive FM-multiplex data when located underground or inside a building.
When using FM-multiplex broadcasting, the electric power needed at the receiving terminal is large, which is a disadvantage from the standpoint of portability. For example, one had to have large capacity batteries, which was a problem.
SUMMARY OF THE INVENTION
In view of the above- described situation, it is an object of the present invention to provide a positioning system, a positioning method, and a positioning device that enable one to obtain information on the current position of the device even when the latter is located underground or inside a building, as well as to improve portability.
Another object of the present invention is to provide a positioning system and a positioning method that enable one to reduce positioning errors. A positioning system of the present invention has, in order to solve the above- noted problems, a radio call base-station, a receiving means to receive data sent from the radio-call base-station, and a positioning device equipped with a positioning means to obtain position data indicating the current position of the device based on data sent from the radio-call base-station. In a positioning system having such a composition, a positioning device obtains position data indicating the current position of the device based on the data sent from the radio-call base-station, using a positioning means.
By the positioning system, a positioning device can obtain position data as long as it can receive data from the radio-call base-station. Also, the positioning method of the present invention enables one to obtain the position data showing the current position of the device based on data sent from the radio-call base-station in order to solve the above-noted problems. The positioning method enables one to obtain position data as long as the data from the radio-call base-station can be received.
The positioning device of the present invention is equipped with a receiving means that receives data sent from the radio-call base-station and a positioning means that obtains position data showing the current position of the device based on data sent from the radio-call base-station in order to solve the above-discussed problems.
A positioning device having such a configuration obtains position data indicating the current position of the device based on data sent from the radio-call base- station by means of the positioning means. By the positioning means means, the positioning device enables one to obtain position data as long as the data from the radio-call base-station can be received.
The positioning system of the present invention comprises, a radio-call base- station equipped with a position-correction-data-generating means that generates position-correction data to correct the position data that the positioning device obtained by measuring positions and a transmission means to send data to the positioning device. Also, the positioning system of the present invention has a positioning device equipped with a receiving means to receive data sent from the radio-call base-station, a positioning means that obtains position data by measuring the current position of the device based on the signals sent from an artificial satellite, and a position-data- correction means that corrects the position data based on the position-correction data received by the receiving means.
In the positioning system having such a configuration, the radio-call base-station sends out position-correction data generated by a position-correction-data-generating means to the positioning device, using the transmission means. At the positioning device, the position data obtained by measuring the current position of the device based on the signals sent from the artificial satellites by the positioning means are corrected by the position-data-correction means using the position-correction data received by the receiving means.
By the positioning system, the positioning device corrects the position data using the position-correction data sent from a radio-call base-station that covers a relatively narrow service area, data generated at said radio-call base-station.
Also, according to the positioning method of the present invention, in order to solve the above-discussed problems, the position data obtained upon measuring the current position of the device based on signals sent from artificial satellites are corrected using the position-correction data sent from the radio-call base station. According to the positioning method, the position data are corrected using the position-correction data sent from a radio-call base-station that services a relatively narrow service area, data generated at said radio-call base-station.
BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a block diagram that shows a positioning system in the form in which the present invention is actually applied; and
Figure 2 is a flowchart showing the processing sequence that a portable terminal or device executes to obtain position data in a positioning system.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
A positioning system applied to a radio-call system of the present invention will be explained in detail in conjunction with accompanying drawings. A portable terminal, that is a positioning device, carries out an application program based on the position data obtained by the positioning system after measuring positions. As shown in Figure 1, the positioning system includes a base station 2 that broadcasts data, a portable terminal 3 that receives data from the base station 2, and GPS (Global Positioning System) satellites 4, 5, 6, and 7 that send to the base station 2 and the portable terminal 3 signals for measuring positions. In the positioning system, the portable terminal 3 receives as information concerning the terminal's current position primary position data based on data sent from the base station 2 and secondary position data obtained by making use of satellite signals from GPS satellites 4, 5, 6, and 7 (hereafter called GPS signals).
In the positioning system having such a configuration, the base station 2 includes a GPS standard receiver 11 that is a position-correction-data-generating means that generates position-correction data to correct the secondary position data and a radio-call base-station 12 that sends data to the portable terminal 3. The portable terminal 3 is equipped with a radio-call-reception part 13 having a radio-call reception function that is a reception function to receive data sent from base station 2 and a positioning function that obtains the primary position data showing the current position of the terminal based on data sent from the base station 2, a GPS-reception part 14 having a positioning function that obtains the secondary position data after measuring the current position of the terminal based on the signals sent from GPS satellites 4, 5, 6, and 7, and a position-data-correction function that corrects the secondary position data using the position-correction data sent from the base station 2, and an information- processing part 15 having a function of performing information processing using the position data obtained by the radio-call-reception part 13 and the GPS-reception part 14. The base station 2 is composed of a GPS standard receiver 11 and a radio-call base-station 12.
The GPS standard receiver 11, on receiving GPS signals from GPS satellites 4, 5, 6, and 7, obtains information about its own position and generates position-correction data. The GPS standard receiver 11 generates position-correction data by using, for example, a relative positioning method (differential GPS or DGPS).
Here the generation of position-correction data using a relative positioning method will be explained. The GPS standard receiver 11, that is located at the reference point whose position is accurately known, measures position based on the GPS signals sent from GPS satellites 4, 5, 6, 7, using a GPS receiver. This reference point's position and the position data measured by the GPS receiver are collated and compared at the GPS standard receiver 11. After this collation and comparison, the error component contained in the GPS signals caused by the SA (Selective Availability), the satellites system and the transmission medium is detected at the GPS standard receiver 11. This error component that is detected is called the position-correction data. This is arrived at by utilizing the fact that, if a GPS receiver (portable terminal 3) is found within a 100 - 200 km range from the reference point (the GPS standard receiver 11), the error in measurement of position is hardly different from the error detected at the reference point. In specific terms, the portable terminal 3 obtains corrected position data by deducting this error component (the position-correction data) from the position data it obtained by measuring its position. Also, it can be said that one can improve the positioning accuracy if the distance from the reference point is small, but the effect of the correction decreases as one moves farther away from the reference point.
By using the relative positioning method described above, one can improve the positioning accuracy of a GPS receiver (the portable terminal 3).
Position-correction data generated at the GPS standard receiver 11 are sent to a portable terminal 3 by the radio-call base-station 12.
The radio-call base-station 12 is a data-transmission station that sends data to the portable terminal 3, and is composed as a data-transmission station in a so-called radio- call system. The base station 2 is created by having this traditional radio-call base- station 12 equipped with a GPS standard receiver 11. This radio-call base station 12 is made in a way that it sends out various kinds of information to information-receiving terminals such as "pocket-bell" pagers or pager receivers. In other words, the radio-call base-station 12 is, for example, a data- transmission station that sends to information-receiving terminals such as pager data from senders transmitted from a public-telephone network via a radio-call central station.
In addition, in recent years, the radio-call system has been used to deliver various kinds of information such as weather forecasts and information on events to users.
Also, the service area of this radio-call base-station 12 is relatively narrow and is supposed to be narrower than a broadcasting area of a FM-multiplex-broadcasting station, for example. The radio-call base-station 12 sends area data made up of information showing its own location to the portable terminal 3.
The base station 2, by virtue of being equipped with the GPS standard receiver 11 and the radio-call base-station 12 as described above, sends position-correction data to correct the position data to the portable terminal 3, making use of the radio-call system. As for transmission of position-correction data, these are sent, in concrete terms, included with various kinds of information. Also, a number of such base stations 2 exist in a positioning system, and each base station 2 sends position-correction data obtained on its own to the portable terminals 3 found in the service area.
The radio-call-reception part 13 of portable terminal 3 is made as a receiving means to receive data sent from base station 2. The radio-call-reception part 13 receives the data sent by radio from the base station 2 using antenna 16.
The radio-call-reception part 13 also receives position-correction data sent from the base station 2. The position-correction data received by the radio-call-reception part 13 are output to the GPS-reception part 14. In addition, the radio-call-reception part 13 is made such that it can obtain the approximate current position of the portable terminal 3 based on the area data sent from the base station 2. The radio-call-reception part 13 measures the current position on its own using this, without using GPS signals.
For example, the radio-call-reception part 13 obtains as the primary position data its own approximate current position from the area data showing the position of the base station 2 sent from the base station. In other words, in this case, the portable terminal 3 located in the service area recognizes as its own current position the location of base station 2.
The primary position data obtained by this radio-call reception part 13 are output to the information-processing part 15. The GPS-reception part 14 measures the current position on receiving via antenna 17 the GPS signals sent from GPS satellites 4, 5, 6, and 7, and obtains position data.
The GPS-reception part 14 corrects the secondary position data when the radio- call reception-part 13 is receiving position-correction data sent from the base station 2 using these data. And the GPS-reception part 14 outputs the secondary position data thus obtained to the information-processing part 15.
The radio-call-reception part 13 described above also has a function to automatically switch the reception frequency, using the secondary position data. According to this, the radio-call-reception part 13, when it has moved to a service area with a different reception frequency, automatically changes the reception frequency, using the secondary position data.
The information-processing part 15 has a function to execute application programs.
For example, there is a piece of software that allows a map to be displayed as an application program. This program allows a map to be displayed on a display panel such as a liquid-crystal monitor. The information-processing part 15 executes this program using the position data obtained by the radio-call-reception part 13 and the GPS-reception part 14 via the operation described above. In other words, for example, the information-processing part 15 displays in images the current position of the device on the map based on the primary or secondary position data.
Furthermore, the position data are, as described above, either the primary position data, data that indicate the approximate current position of the device, that radio-call-reception part 13 obtained from the data sent from the base station 2 or the secondary position data that the GPS-reception part 14 obtained on measuring the position using the GPS signals sent from GPS satellites 4, 5, 6, and 7. Therefore, the information-processing part 15, for example, normally prefers to use the secondary- position data whose positioning accuracy is higher over the other data to execute programs.
A portable terminal 3 having the above-described composition executes a map- display software program using data sent from the base station 2 or the position data obtained using the GPS signals sent from GPS satellites 4, 5, 6, and 7. Figure 2 shows a sequence of processes the portable terminal 3 executes in order to obtain position data. More specifically, it shows a sequence of processes starting from a search for a desired GPS satellite.
First of all, at step SI, a portable terminal 3 begins the operation of measuring positions. In other words, the portable terminal 3 starts a sequence of processes to obtain position data.
At step S2, the portable terminal 3 discriminates whether it is possible to receive radio transmissions. For example, the portable terminal 3 makes this determination by detecting whether or not data have been received from the base station 2. If the reception of radio transmission is possible, the portable terminal 3 proceeds to step S3. If that reception is not possible, the portable terminal 3 proceeds to step S7.
At step S7, the portable terminal 3 determines whether or not GPS satellites have been found by search for GPS satellites. If GPS satellites have been found, the portable terminal 3 proceeds to step S8, executes positioning on its own using the GPS signals, and obtains the secondary position data. On the other hand, when GPS satellites have not been found, the portable terminal 3 proceeds to step S9, executes a not-possible-to-execute-positioning process - for example, an error process - and terminates this positioning process.
At step S3, the portable terminal 3 tries to obtain the area data of the base station 2. For example, it obtains the secondary position data made of the area data sent from the base station 2. Based on these area data, the portable terminal 3 searches for GPS satellites and determines, at step S4, whether GPS satellites have been found. When GPS satellites have been found, the portable terminal 3 proceeds to step S5, and when GPS satellites have not been found, it proceeds to step S10.
At step S10, the portable terminal 3 obtains as a result of measuring positions the area data of the base station 2.
At step S5, the portable terminal 3 determines whether there exist DGPS data (position-correction data) from radio-call base-station 12. For example, the portable terminal 3 determines whether position-correction data are stored in the data sent from the base station 2. If DGPS data exist, the portable terminal 3 obtains the position using those DGPS data - in other words, the secondary position data corrected by the position- correction data. When DGPS data do not exist, the portable terminal 3 proceeds to step Sll, executes positioning on its own using the GPS signals, and obtains the secondary position data.
Through a sequence of such processes as described above, the portable terminal 3 obtains position data.
In other words, the portable terminal 3 obtains position data based on the GPS signals sent from GPS satellites at step Sll, and in the case where DGPS data have been received from the base station 2, it corrects the position data using these DGPS data at step S6. Also, when it is not possible to find GPS satellites, the portable terminal 3 obtains position data based on the area data of the base station 2 at step S10.
When it is not possible to receive data from the base station 2, the portable terminal 3 obtains position data by searching for GPS satellites and receiving GPS signals at step S8.
The portable terminal 3 uses the position data that it obtained through such processes as data for executing application programs.
The positioning system is composed of the component parts as described above. By organizing the positioning system in such a way, the following is made possible: The portable device 3 can measure a position based on data sent from the base station 2 by utilizing a radio-calling system. By this means, the portable terminal 3 can obtain information on its approximate current position based on data sent from the base station 2, even if it is found at a place where it cannot directly receive radio waves from the GPS satellites such as in an underground center or inside a building, as long as it can make use of a radio-calling system.
Also, when one has traveled a long distance without having measured a position using GPS satellites, for example, if one tries to start measuring a position using GPS satellites, it becomes necessary to search for GPS satellites. However, since the portable terminal 3 can determine its approximate current position as the primary position data based on the data from the base station 2, the time needed to search for GPS satellites can be reduced even in such cases.
Also, when measuring a position using GPS satellites, the portable terminal 3 corrects the error in the GPS signals sent from satellites, using the position-correction data sent from the radio-call base-station. Through this means, more accurate position data can be obtained.
Since the portable terminal 3 can automatically switch frequencies from the base station 2, which are different for each radio-call area, using the positions measured by means of GPS satellites, it becomes possible to automatically select radio-calling by area. For example, the portable terminal 3 can receive data from the base station, even when it has been moved to a neighboring service area without having the user adjust it manually. Also, since radio-call base-stations 12 - in other words, a base station made by installing a GPS standard receiver 11 in a radio-call base-station 12 - exist in relatively large numbers, it becomes possible, in general, to offer a position-correction system the accuracy of which is higher than that of a position-correction system that makes use of FM-multiplex broadcasting. In other words, by having each base station 2 covering a relatively small service area generate position-correction data, the position data obtained at the portable terminal 3 using said position-correction data become information that indicates accurately the current position of the terminal.
Also, since the base station 2 can be made by simply adding a GPS standard receiver 11 to an existing radio-call base-station 12, one can easily build an infrastructure, which is simpler than making a new network.
Also, the positioning system is not limited to a structure made by using four GPS satellites. Such system can be built using more than five GPS satellites.
Although it is explained in the above- described actual example that position- correction data are generated by installing the GPS standard receiver 11 at each base station 2, it is possible, for example to generate position-correction data at the central station created to control data for the base stations 2. In this case, the position- correction data generated at the GPS standard receiver 11 installed at the central station are sent to each base station. And these position-correction data sent from the central station are corrected further at each base station in consideration of the location of each base station and are sent to portable terminals 3. Also, as for correcting position- correction data in view of the difference in location of each base station, it can be done at the central station in advance for each base station, and these corrected data can be sent to each base station.
The positioning system of the present invention has a radio-call base-station that transmits data and a positioning device equipped with a receiving means to receive data sent from a radio-call base-station and a positioning means to obtain position data indicating the current position of the device based on data sent from a radio-call base- station. A positioning device can obtain, through the positional means, position data indicating the current position of the device based on data sent from a radio-call base- station. By the positioning system, a positioning device can obtain position data as long as it can receive data from a radio-call base-station.
Also, according to the positioning method of the present invention, by obtaining position data indicating the current position of the device based on data sent from a radio-call base-station, position data can be obtained as long as data from a radio-call base-station can be received.
Also, the positioning device of the present invention, by being equipped with a receiving means to receive data sent from a radio-call base-station and a positioning means to obtain position data indicating the current position of the device based on data sent from a radio-call base-station, can obtain position data indicating the current position of the device based on data sent from a radio-call base-station by the positioning means.
By the positioning means, the positioning device can obtain position data as long as it can receive data from a radio-call base-station.
The positioning system of the present invention also comprises a position- correction-data-generating means that generates position-correction data to correct the position data obtained by the positioning device on measuring a relevant position and a radio-call base-station equipped with a transmission means to send data to the positioning device. A positioning system of the present invention also has a positioning device equipped with a receiving means to receive data sent from a radio-call base- station, a positioning means to obtain position data on measuring the current position of the device based on signals sent from artificial satellites, and a position-data-correction means to correct the position data based on the position-correction data received by a receiving means. In a positioning system having such a configuration, the radio-call base-station can send position-correction data generated by the position-correction-data- generating means to a positioning device using a transmission means, and the positioning device can correct, via the position-data-correction means, the position data, obtained by measuring the current position of the device based on signals sent from artificial satellites by the positioning means, using the position-correction data received by the receiving means.
Since, in the positioning system, the positioning device can correct position data using position-correction data - data generated at the radio-call base-station - sent from said radio-call base-station covering a relatively narrow service area, the accuracy of position data can be improved.
Also, according to the positioning method of the present invention, by correcting the position data obtained by measuring the current position of the device based on signals sent from artificial satellites using the position-correction data sent from a radio- call base-station, position data can be corrected using the position-correction data - data generated at the radio-call base-station - sent from said radio-call base-station covering a relatively narrow service area, which makes it possible to improve the accuracy of position data.

Claims

CLAIMSWhat is claimed is:
1. A positioning system for obtaining information about a current position of a device, comprising: a radio-call base-station which sends data; and a positioning device including a receiving means which receives data sent from said radio-call base-station and a positioning means which obtains position data indicating a current position of the device based on data sent from said radio-call base- station.
2. The positioning system of Claim 1, wherein said positioning means obtains position data indicating the current position of the device based on area data, showing a location of said radio-call base-station, sent from said radio-call base-station.
3. The positioning system of Claim 1, wherein said positioning device includes a secondary positioning means to obtain secondary position data by measuring the current position of the device based on signals sent from artificial satellites, and said positioning device obtains position data by said positioning means when it is impossible to measure the position of the device using said secondary positioning means.
4. The positioning system of Claim 3, wherein said radio-call base-station is equipped with a position-correction-data- generating means to generate position-correction data to correct said secondary position data, and said secondary positioning means includes a position-data-correction means to correct said secondary position data using said position-correction data sent from said radio-call base-station.
5. The positioning system of Claim 3, wherein said positioning device is installed in a radio-call reception-terminal that receives data sent from said radio-call base-station, and said radio-call reception-terminal includes a reception-frequency-switching means to switch a reception frequency based on said secondary position data.
6. A positioning method for obtaining information about a current position of a device, comprising the steps of: sending data from a radio-call base station; receiving data sent from said radio-call base station at a positioning device; and obtaining position data indicating a current position of the device based on data sent from said radio-call base-station.
7. The positioning method of Claim 6, wherein position data indicating the current position of the device are obtained based on area data, showing a location of said radio- call base-station, sent from said radio-call base-station.
8. The positioning method of Claim 6, wherein said position data are obtained based on data sent from said radio-call base-station when it is not possible to measure the current position of the device based on signals sent from artificial satellites.
9. The positioning method of Claim 8, wherein the position data obtained by measuring the current position of the device based on signals sent from artificial satellites are corrected using position-correction data generated at said radio-call base- station and sent from said radio-call base-station.
10. A positioning device for obtaining information about a current position of the device comprising: a receiving means which receives data sent from a radio-call base-station, and a positioning means which obtains position data indicating the current position of the device based on data sent from said radio-call base-station.
11. The positioning device of Claim 10, wherein said positioning means obtains position data indicating the current position of the device based on area data, showing a location of said radio-call base-station, sent from said radio-call base-station.
12. The positioning device of Claim 10, and further comprising a secondary positioning means to obtain secondary position data on measuring the current position of the device based on signals sent from artificial satellites, and that it obtains said position data by said positioning means when it is not possible to measure the position of the device using said secondary positioning means.
13. The positioning device of Claim 12, and further comprising a position-data- correction means to correct said secondary position data using said position-correction data sent from said radio-call base-station.
14. The positioning device of Claim 12, which is installed in a radio-call reception- terminal that receives data sent from said radio-call base-station and said radio-call reception-terminal includes a reception-frequency-switching means to switch reception- frequencies based on said secondary position data.
15. A positioning system for obtaining information about a current position of a device, comprising: a radio-call base-station including a position-correction-data-generating means which generates position-correction data which corrects position data obtained by a positioning device on measuring a position of the device; and a transmission means which sends data to the positioning device; and said positioning device including a receiving means which received data sent from said radio-call base-station, a positioning means which obtains position data measuring the current position of the device based on signals sent from artificial satellites, and a position-data-correction means which corrects said position data based on said position-correction data received by said receiving means.
16. The positioning system of Claim 15, wherein said positioning device is installed in a radio-call reception-terminal to receive data sent from said radio-call base-station, and that said radio-call reception-terminal is equipped with a reception-frequency-switching means to switch reception frequencies based on said position data.
17. A positioning method for obtaining information about a current position of a device wherein position data obtained by measuring the current position of the device based on signals sent from artificial satellites are corrected using position-correction data sent from a radio-call base-station.
18. The positioning method of Claim 17, wherein a radio-call reception-terminal that receives data sent from said radio-call base-station switches reception frequencies based on said position data.
PCT/JP1999/006479 1998-11-20 1999-11-19 Positioning system, positioning method and positioning device WO2000031561A1 (en)

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AU11843/00A AU1184300A (en) 1998-11-20 1999-11-19 Positioning system, positioning method and positioning device
EP99972742A EP1057042A1 (en) 1998-11-20 1999-11-19 Positioning system, positioning method and positioning device
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020074394A (en) * 2001-03-19 2002-09-30 가부시키가이샤 히타치세이사쿠쇼 Mobile handset with position calculation function
KR100441325B1 (en) * 2002-03-18 2004-07-23 (주)제이티 Location and Direction Tracing System Using RF Module and Method thereof
CN104090263A (en) * 2014-06-17 2014-10-08 中国科学院信息工程研究所 Positioning method and system based on RFID technology

Families Citing this family (54)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6560461B1 (en) 1997-08-04 2003-05-06 Mundi Fomukong Authorized location reporting paging system
US7053824B2 (en) 2001-11-06 2006-05-30 Global Locate, Inc. Method and apparatus for receiving a global positioning system signal using a cellular acquisition signal
US6172640B1 (en) * 1999-06-18 2001-01-09 Jennifer Durst Pet locator
US6441778B1 (en) * 1999-06-18 2002-08-27 Jennifer Durst Pet locator
US6236358B1 (en) * 1999-06-18 2001-05-22 Jennifer Durst Mobile object locator
US6640106B2 (en) * 2001-09-20 2003-10-28 Motorola, Inc. Method and system for verifying the position of a mobile station using checkpoints
FI108372B (en) 2000-06-30 2002-01-15 Nokia Corp Method and apparatus for position measurement
US20070200752A1 (en) 2001-06-06 2007-08-30 Global Locate, Inc. Method and apparatus for maintaining integrity of long-term orbits in a remote receiver
US7443340B2 (en) 2001-06-06 2008-10-28 Global Locate, Inc. Method and apparatus for generating and distributing satellite tracking information
US20020102989A1 (en) * 2001-01-26 2002-08-01 Calvert Brian Edward Method and apparatus for accurately locating a communication device in a wireless communication system
US6757545B2 (en) * 2001-03-01 2004-06-29 Steven P. Nowak Location information management system and method for mobile communications unit
US6968195B2 (en) * 2001-03-01 2005-11-22 Openwave Systems Inc. Enhanced PDE selection
JP3624890B2 (en) * 2001-03-29 2005-03-02 株式会社デンソー Data transfer system
US8358245B2 (en) * 2001-06-06 2013-01-22 Broadcom Corporation Method and system for extending the usability period of long term orbit (LTO)
US7548816B2 (en) 2001-06-06 2009-06-16 Global Locate, Inc. Method and apparatus for generating and securely distributing long-term satellite tracking information
US6651000B2 (en) 2001-07-25 2003-11-18 Global Locate, Inc. Method and apparatus for generating and distributing satellite tracking information in a compact format
JP4049558B2 (en) * 2001-08-06 2008-02-20 株式会社デンソー Wireless communication terminal, computer program, and position-related information transmission method
JP2003070051A (en) * 2001-08-29 2003-03-07 Denso Corp Mobile communication terminal apparatus and program therefor
JP3791369B2 (en) * 2001-08-30 2006-06-28 株式会社デンソー Wireless communication terminal, computer program, and search information transmission method
KR20030030594A (en) * 2001-10-12 2003-04-18 유승준 A System for position recognition of underground facilities
US7656350B2 (en) * 2001-11-06 2010-02-02 Global Locate Method and apparatus for processing a satellite positioning system signal using a cellular acquisition signal
FR2834572B1 (en) * 2002-01-08 2004-07-09 Ge Med Sys Global Tech Co Llc RADIOLOGICAL IMAGING SYSTEM, MEDICAL SYSTEM COMPRISING A PLURALITY OF INTERNAL CLOCKS AND SYNCHRONIZATION METHOD
US7017097B1 (en) 2002-09-24 2006-03-21 Cypress Semiconductor Corp. Simultaneously driving a hardware device and a software model during a test
KR100507080B1 (en) * 2002-10-18 2005-08-09 현대자동차주식회사 Window open and close apparatus of vehicle and method thereof
US7626958B2 (en) * 2002-12-05 2009-12-01 The Boeing Company Serial port multiplexing protocol
US7089018B2 (en) * 2002-12-05 2006-08-08 The Boeing Company Communication system for tracking assets
TWI229564B (en) * 2003-02-19 2005-03-11 Sk Telecom Co Ltd Test apparatus and control method thereof for use with location based service system capable of optimizing location based service by adjusting maximum antenna range
JP4559042B2 (en) * 2003-06-20 2010-10-06 株式会社 古栃建設 Road snow removal machine
US9723087B2 (en) 2004-08-03 2017-08-01 Lg Electronics Inc. User privacy management apparatus and method in mobile communications system
JP2006109355A (en) * 2004-10-08 2006-04-20 Ntt Docomo Inc Mobile communication terminal and location information utilizing method
GB2421619B (en) * 2004-12-09 2009-12-23 Dean John William Corrigan A communications system
JP4179287B2 (en) * 2005-01-25 2008-11-12 セイコーエプソン株式会社 POSITIONING SYSTEM, TERMINAL DEVICE, TERMINAL DEVICE CONTROL METHOD, AND TERMINAL DEVICE CONTROL PROGRAM
JP4609095B2 (en) * 2005-02-04 2011-01-12 セイコーエプソン株式会社 Positioning system
KR100648270B1 (en) * 2006-03-29 2006-11-23 (주)래디안트 Mobile communication terminal capable of position determination and method of determining position in the mobile communication terminal
US7932831B2 (en) * 2006-07-11 2011-04-26 At&T Intellectual Property I, L.P. Crowd determination
US8099105B2 (en) * 2006-09-19 2012-01-17 Telecommunication Systems, Inc. Device based trigger for location push event
US20080180322A1 (en) * 2007-01-26 2008-07-31 Mohammad Mojahedul Islam Method and system for wireless tracking of utility assets
US8834409B2 (en) * 2008-07-29 2014-09-16 Covidien Lp Method for ablation volume determination and geometric reconstruction
US8412094B2 (en) * 2010-06-15 2013-04-02 Intel Mobile Communications GmbH Position signal receiver
CN102288182B (en) * 2010-06-21 2014-10-22 上海博泰悦臻电子设备制造有限公司 Navigation information providing method and navigation information providing system
JP2012244368A (en) * 2011-05-19 2012-12-10 Sony Corp Radio communication device, information processing device, communication system and position determination method
CN103491625B (en) * 2012-06-11 2018-08-07 南京中兴软件有限责任公司 A kind of localization method and system of mobile radio terminal
CN102879004B (en) * 2012-06-15 2015-07-08 浙江吉利汽车研究院有限公司杭州分公司 Navigation map updating method and device thereof based on GPS (Global Position System) navigating instrument
US20140179337A1 (en) * 2012-12-21 2014-06-26 Yaron Alpert Systems and methods for selecting an optimal location service
US10101465B2 (en) * 2012-12-28 2018-10-16 Trimble Inc. Electronic tape measure on a cellphone
US9779606B2 (en) * 2013-10-25 2017-10-03 Beijing Qihoo Technology Company Limited Methods, devices, and systems for prompting whether portable locator has arrived on time
CN104864888B (en) * 2015-05-12 2018-01-02 北京红旗胜利科技发展有限责任公司 A kind of method and apparatus of navigation device position amendment
CN108139486A (en) 2015-09-16 2018-06-08 深圳市大疆创新科技有限公司 For the system and method for UAV positioning
US9850839B2 (en) * 2016-01-29 2017-12-26 Ford Global Technologies, Llc System and method for hill ascent speed assistance
CN105929362B (en) * 2016-04-17 2018-09-21 吉林大学 A kind of multiple target six degree of freedom electromagnetic locator and method
CN107390168A (en) * 2016-05-16 2017-11-24 北京京东尚科信息技术有限公司 Indoor locating system, method and apparatus based on general software radio peripheral hardware
CN106998535B (en) * 2017-05-31 2021-03-02 哈尔滨学院 Mobile terminal positioning correction method and system
KR101988632B1 (en) * 2018-12-26 2019-06-12 주식회사 공간정보 drone measurement system and method for measuring length crossing
US11953608B2 (en) 2019-07-08 2024-04-09 Mitsubishi Electric Corporation Position estimation device and position estimation method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5422813A (en) * 1992-12-17 1995-06-06 Stanford Telecommunications, Inc. No-outage GPS/commercial RF positioning system
GB2308033A (en) * 1995-12-04 1997-06-11 Symmetricom Inc Position determination using differential GPS and cellular telephone

Family Cites Families (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61108982A (en) * 1984-11-01 1986-05-27 Furuno Electric Co Ltd Position measuring system of mobile station
JPS62298785A (en) * 1986-06-18 1987-12-25 Nissan Motor Co Ltd Gps position measuring apparatus
JPH02171039A (en) * 1988-12-23 1990-07-02 Toyota Motor Corp Speech channel changeover device
US5499032A (en) * 1992-12-22 1996-03-12 Terrapin Corporation Navigation and positioning system and method using uncoordinated beacon signals
JP3196904B2 (en) * 1992-06-17 2001-08-06 シャープ株式会社 Differential GPS positioning system
US5477228A (en) * 1993-04-13 1995-12-19 Differential Corrections Inc. Differential global positioning system using radio data system
US5936572A (en) * 1994-02-04 1999-08-10 Trimble Navigation Limited Portable hybrid location determination system
JP2928722B2 (en) * 1994-03-22 1999-08-03 株式会社ケンウッド Car navigation system
JPH0836044A (en) * 1994-07-25 1996-02-06 Kyocera Corp Gps device utilizing portable telephone system
JPH0884363A (en) * 1994-09-09 1996-03-26 Canon Inc Mobile communication system
US5742509A (en) * 1995-04-11 1998-04-21 Trimble Navigation Limited Personal tracking system integrated with base station
JP3576268B2 (en) * 1995-05-31 2004-10-13 古野電気株式会社 Positioning device, positioning system and positioning method
JPH0972951A (en) * 1995-09-07 1997-03-18 Nippon Ido Tsushin Kk Dgps-data transmitting system
US5874914A (en) * 1995-10-09 1999-02-23 Snaptrack, Inc. GPS receiver utilizing a communication link
US5794151A (en) * 1995-12-22 1998-08-11 Motorola, Inc. Frequency allocation for shared spectrum transmitter based on location
JP3209090B2 (en) * 1996-05-22 2001-09-17 セイコーエプソン株式会社 Location information providing system
JPH1047982A (en) * 1996-08-06 1998-02-20 Sony Corp Instrument and method for measuring location, device and method for navigation, information service method, and automobile
JPH1098759A (en) * 1996-09-20 1998-04-14 Nec Commun Syst Ltd Mobile communication system
JPH10104335A (en) * 1996-09-27 1998-04-24 N T T Hokkaido Ido Tsushinmo Kk Position measurement system
JP3572161B2 (en) * 1997-01-30 2004-09-29 松下電器産業株式会社 Man location system and current position estimation method
US6072429A (en) * 1997-01-31 2000-06-06 Trimble Navigation Limited Integrated position determination system and radio transceiver incorporating common components
US6111541A (en) * 1997-05-09 2000-08-29 Sony Corporation Positioning system using packet radio to provide differential global positioning satellite corrections and information relative to a position
US5936573A (en) * 1997-07-07 1999-08-10 Trimble Navigation Limited Real-time kinematic integrity estimator and monitor
US6041222A (en) * 1997-09-08 2000-03-21 Ericsson Inc. Systems and methods for sharing reference frequency signals within a wireless mobile terminal between a wireless transceiver and a global positioning system receiver
US5982324A (en) * 1998-05-14 1999-11-09 Nortel Networks Corporation Combining GPS with TOA/TDOA of cellular signals to locate terminal
JP2000156882A (en) * 1998-11-19 2000-06-06 Nippon Telegr & Teleph Corp <Ntt> Phs terminal position information system, position information acquiring device and phs terminal

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5422813A (en) * 1992-12-17 1995-06-06 Stanford Telecommunications, Inc. No-outage GPS/commercial RF positioning system
GB2308033A (en) * 1995-12-04 1997-06-11 Symmetricom Inc Position determination using differential GPS and cellular telephone

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020074394A (en) * 2001-03-19 2002-09-30 가부시키가이샤 히타치세이사쿠쇼 Mobile handset with position calculation function
KR100441325B1 (en) * 2002-03-18 2004-07-23 (주)제이티 Location and Direction Tracing System Using RF Module and Method thereof
CN104090263A (en) * 2014-06-17 2014-10-08 中国科学院信息工程研究所 Positioning method and system based on RFID technology
CN104090263B (en) * 2014-06-17 2016-10-05 中国科学院信息工程研究所 Localization method, system based on RFID technique

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US6289279B1 (en) 2001-09-11
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