WO2000068907A1 - Systeme d'identification de biens et de personnes au moyen d'un gps - Google Patents
Systeme d'identification de biens et de personnes au moyen d'un gps Download PDFInfo
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- WO2000068907A1 WO2000068907A1 PCT/US2000/012297 US0012297W WO0068907A1 WO 2000068907 A1 WO2000068907 A1 WO 2000068907A1 US 0012297 W US0012297 W US 0012297W WO 0068907 A1 WO0068907 A1 WO 0068907A1
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- tag
- base station
- gps
- host
- information
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- 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
- G01S19/07—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing data for correcting measured positioning data, e.g. DGPS [differential GPS] or ionosphere corrections
- G01S19/071—DGPS corrections
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
- B60R25/30—Detection related to theft or to other events relevant to anti-theft systems
- B60R25/33—Detection related to theft or to other events relevant to anti-theft systems of global position, e.g. by providing GPS coordinates
-
- 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
- G01S19/13—Receivers
- G01S19/34—Power consumption
-
- 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
-
- 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
- G01S19/48—Determining position by combining or switching between position solutions derived from the satellite radio beacon positioning system and position solutions derived from a further system
- G01S19/49—Determining position by combining or switching between position solutions derived from the satellite radio beacon positioning system and position solutions derived from a further system whereby the further system is an inertial position system, e.g. loosely-coupled
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R2325/00—Indexing scheme relating to vehicle anti-theft devices
- B60R2325/20—Communication devices for vehicle anti-theft devices
- B60R2325/205—Mobile phones
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2556/00—Input parameters relating to data
- B60W2556/45—External transmission of data to or from the vehicle
- B60W2556/50—External transmission of data to or from the vehicle of positioning data, e.g. GPS [Global Positioning System] data
-
- 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
- G01S2205/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S2205/001—Transmission of position information to remote stations
- G01S2205/002—Transmission of position information to remote stations for traffic control, mobile tracking, guidance, surveillance or anti-collision
Definitions
- the present invention relates to locating objects.
- radio beacons that are attached to assets and personnel in a facility.
- the radio beacons are generally called "tags".
- the tags can be read at relatively long range, typically in excess of 50 meters.
- Antennas are installed indoors or outdoors in a gridlike fashion to cover a complete facility. The antennas remain in continuous contact with tags in range of the antennas.
- LPS Local Positioning Systems
- RTLS Real Time Locating Systems
- LLS Local Locating Systems
- RFID Radio Frequency Identification
- LPS Local Positioning Systems
- PinPoint's 3D-iD system available from PinPoint
- 3D-iD is comprised of two main components, shown in Figure 1, a multi-antenna 102a-102d interrogator 101 that sends Direct Sequence Spread Spectrum interrogation signals 1 10 at 2.44 GHz to tags 103 (only one shown) that are in range.
- the tags transpond this interrogation signal, by receiving the signal at 2.44 GHz, mixing the carrier up to 5.80 GHz, filtering the result to comply with regulatory requirements, and transmitting a resulting FCC-compliant signal 112 at low power in the 5.80 GHz band.
- Interrogator 101 receives this resulting signal, extracts the tag's unique ID, and determines the tag's distance to each antenna by measuring the signal's time of arrival.
- One embodiment of the invention is directed to an object locating system utilizing GPS including a tag, attached to the object, and a base station, having a host.
- the tag includes GPS circuitry, wireless LAN circuitry enabling communication between the host and the tag, and a power-saving feature.
- the power saving feature may take on numerous forms.
- the locating system comprises: a base station on the vehicle, the base station including a differential GPS receiver; and a tag attached to the object.
- the tag includes: GPS circuitry; and wireless LAN circuitry for communicating information between the tag and the base station. Inverted differential GPS corrections are performed at the base station on tag positional information.
- the object may be an individual (person).
- An even further embodiment of the invention is directed to a location system for use in an application including at least one mobile object.
- the location system comprises: a host; and a tag placed on the object.
- the tag includes: GPS circuitry; inertial technology circuitry; and wireless LAN circuitry for communicating information between the tag and the host. When the tag loses communication with Navstar GPS satellites, the tag utilizes inertial technology to estimate its location as an offset to the last known GPS-based location.
- the object may be an individual.
- Figure 1 shows an example LPS system.
- Figure 2 shows the operation of a GPS tag.
- Figure 3 shows the initialization of a GPS tag according to an embodiment of the invention.
- FIG. 4 is a flow diagram of GPS tag operation according to an embodiment of the invention.
- Figure 5 is a diagram showing a system according to an embodiment of the invention.
- Figure 6 is a flow diagram showing operation of a tag according to an embodiment of the invention.
- LPS Local Positioning Systems
- RTLS Real Time Locating Systems
- LLS Local Locating Systems
- LLS Local Locating Systems
- 3D-iD is representative of LPS systems in the sense that it is designed to support a high density of low-cost tags, with substantial cost per square foot being placed in the infrastructure used to read the tags. This is appropriate for indoor applications where many assets are tracked in the absence of a usable Global Positioning System (GPS) signal.
- GPS Global Positioning System
- Tags are placed on objects, such as trailers, that are not densely located within an area; 2. The applications span large areas and, thus, are impractical to cover with a network of LPS readers, given the relatively low density of tags; and 3. GPS satellite signals are available.
- tags may have tag densities of fewer than 25 tags per acre. If interrogators are installed at a fully loaded cost of $0.10 per square foot, this results in a cost of about $4,000 per acre, plus the cost of the tags themselves. Such economics suggest that certain applications would benefit from a more expensive tag requiring minimal infrastructure.
- the above-defined three application characteristics point toward a design that incorporates a GPS receiver in a relatively sophisticated tag. The low density of tags justifies a more expensive tag in order to minimize the per-square-foot cost of yard coverage.
- Such a tag can integrate two technologies. First, an inexpensive GPS receiver enables the tag to determine its own location. Second, a wireless radio technology provides a link to a host.
- GPS-enabled tag will not simply act as a beacon; instead, it will ascertain its own location and communicate that location to a host computer. For outdoor applications. GPS chipsets from vendors such as Trimble Navigation Limited (749 North Mary Avenue, Sunnyvale, CA 94086) and SiRF Technology (148 E.
- FIG. 2 illustrates an embodiment of a system according to the invention, which includes a tag incorporating a GPS receiver, henceforth called a "GPS Tag".
- the GPS Tag 202 receives navigation signals from a constellation of Navstar satellites, represented by 201a, 201b, and 201c.
- a GPS Receiver 203 in the GPS tag decodes the navigation signals and estimates the tag's position.
- GPS Receivers are commercially available, for example one of Timble's Lassen GPS modules (such as the Lassen SK8).
- a low-cost receiver is used, providing relatively inaccurate position estimates.
- These uncorrected position estimates are transmitted via signal 212 to the Base Station 205 using Com Radios 204 (GPS Tag transmit) and 206 (Base Station receive).
- Differential corrections are applied at the Base Station, using an off-the-shelf Differential GPS (DGPS) receiver technology 208.
- DGPS Differential GPS
- An example of an available DGPS is Trimble's Inverted Differential GPS Base Station.
- the Differential Receiver 208 can be placed at any convenient pre-surveyed location 209 on the site, such as on the roof of a warehouse. This receiver is used to calibrate the errors received from each satellite in view, which is applied to the data received from tag 202. The result is a reasonably accurate estimate of the tag's location, in the range of 2-5 meters, which is good enough to distinguish a location within one or two parking spaces. It is also possible to enable each tag for differential GPS, but with today's technology this would unnecessarily increase the cost of the tag. It is to be appreciated, however, that for applications with relatively few tags, such an approach may nonetheless be preferable and is intended to be within the scope of this application.
- the Com Radio Modules 204 & 206 can be provided using one of the mainstream Wireless Local Area Network (WLAN) standards, such as 802.1 1 or DECT PCS.
- WLAN Wireless Local Area Network
- the choice is driven by other uses for the communication infrastructure. For example, if the yard already has 802J 1 installed for support of mobile terminals, then 802J 1 is a logical choice. DECT/PCS may be preferred where local voice applications predominate.
- the costs per tag are similar, with the communications circuitry costing less than $50 per tag, and with that cost rapidly decreasing. For a lower cost link, 900 MHz technology can also be utilized. It is to be appreciated that any wireless communication device can be used, that the tag may be broken up into its individual parts, and that these modifications are intended to be within the scope of the invention.
- the tagged item may be a vehicle that already incorporates a cell phone that might be used for the wireless connection; with the caveat that a public cellular network may be an expensive, power-hungry, and time-consuming way to send position updates (of a few bytes each) to a location that is not very far away.
- the Base Station Com Radio 206 is not necessarily co-packaged as shown in Figure 2.
- 802J 1 access points are usually directly connected to an Ethernet LAN. To provide 802J 1 coverage of an entire yard, several 802J 1 access points may be required.
- the Com Radio 206 may actually be implemented as several remote radio access points communicating with the Base Station 205 over a LAN.
- power for the tag can be drawn from the batteries in the vehicles.
- the tag can include batteries that may be recharged by solar power.
- batteries that may be recharged by solar power.
- simple conventional batteries such as lithium cells
- power judiciously for long life.
- the architecture of a GPS Tagging System provides several opportunities for power management to extend the life of such batteries.
- the tag is normally asleep, waking up periodically to check if it is in range of a base station.
- Most commercially available Com Radios 204 and 206 include a flexible means for a mobile radio to efficiently search for a nearby network access point.
- FIG. 3 is similar to Figure 2, except that the reference/initialization data and commands are moving from the Base Station's DGPS Station 208 to the GPS Tag's Power Saving Logic 215.
- This Power Saving Logic dramatically reduces the time the GPS Receiver needs to operate to determine its location. GPS parameters are provided from the Base Station to allow the GPS Receiver to more quickly synchronize with Navstar satellites. Commands from the Base Station control the frequency of determining the locations.
- a Motion Detector 216 in the GPS Tag helps determine whether it is necessary to update the Tag location.
- the purpose is to enable the GPS Receiver to use no more power than is necessary. Both to improve system response times and reduce power requirements of the tag, there are various ways that the tag and system of this embodiment of the invention can take advantage of the fact that the base station and the tag are in the same vicinity.
- Trimble's Lassen LP GPS module which might be used in GPS Receiver 203, gives 4 specifications for acquisition time. A cold start is specified as no initialization, and takes 130 seconds. A warm start, specified at 45 seconds, takes advantage of "that last position, time, and almanac are saved in battery-backed memory": this information can be provided from the Base Station 205 through the Corns Radios 206 and 204.
- a hot start specified at 20 seconds, "implies ephemeris is also saved"; which the Base Station can also provide. Finally, reacquisition after signal loss is specified at 2 seconds. Since the Base Station is reading almost the same GPS signal as the tag, this information might also be downloaded by the Base Station and sent to the tag, with the main challenge being that the time base of the tag and the base station need to be synchronized. In the case of 802.11, the system is synchronous and time slotted, with a data transmission rate of about one bit every 1 microseconds (or less). Thus, a synchronous communications link can be used for time synchronization on the order of about 1 microseconds, corresponding to about a 1000-foot error (light travels about one foot per nanosecond). Since the Base Station can also transmit the location and altitude of the facility, the tag can thus greatly limit its search and lock onto the satellites very quickly.
- Packet-level time synchronization yields accuracy on the order of the packet length, i.e., some fraction of a millisecond.
- a motion detector can be used to help conserve power consumption.
- a motion detector in the tag such as a mercury jitter switch, can greatly reduce the need to operate the tag's GPS Receiver 203.
- Base Station Software 207 can also instruct the tag when locations need to be calculated, either in response to a user request or on a repeated scheduled basis. For example, an asset management system may command a specific tag to recalculate its position more frequently when a move is scheduled. Alternatively, all tags may be commanded to recalculate their positions less frequently at night when a yard is not in operation.
- the communications capability of the tag can be leveraged for wireless monitoring of devices throughout the yard.
- the tag's communication module can be integrated with a temperature monitor to verify that the trailer's refrigeration unit is operating correctly.
- vehicle parameters such as fuel levels, odometer readings, hours of operation, and so forth can be monitored by the tag and reported, which combined with vehicle location can be used for maintenance purposes.
- the tags can be used to archive vehicle activities when it is outside of the range of a base station.
- the Base Station can archive time-stamped differential corrections and apply these to the time-stamped archives on the tag. If integrated with a cellular phone in the vehicle, location archives can be downloaded to a base station periodically through public phone networks. Eventually, the tag ' s clock, if uncorrected, will lose synchronization with the base; however, the tag's GPS receiver can be used to keep its clock accurate.
- FIG. 4 illustrates an embodiment of a method of the invention for the operation of a
- GPS Tag working in conjunction with a Base Station.
- the tag is usually in a sleep state to conserve power.
- Some microprocessors such as the Microchip 16F84 (sold by Microchip Technology Inc., 2355 West Chandler Blvd., Chandler, Arizona, 85224-6199) include a watchdog timer for a very low-powered sleep state. The end of the sleep period might be triggered by a motion sensor in the tag and/or the passage of time.
- the tag wakes up 401 and checks if it is in range of a Base Station 402. If communication with a Base Station is established 402, the Base Station determines the instantaneous status of GPS satellites in view 404 and transfers this information to the GPS Tag as a reference 405.
- Data transmitted may include Base Station position, current time, almanac, and ephemeris.
- the GPS Tag may proceed with a position estimate anyway 403 Yes; such position estimate is logged for future transmission when a base station comes into range of the tag. Without data from the Base Station, it will take more time and power to lock onto available GPS satellites, so such estimates may not be done very frequently if there are power constraints. For example, if a Base Station is in range, the tag's position may be calculated once per minute when the tag's motion sensor indicates that the tag is in motion. When the tag is in motion and out of reach from the base station, or if the tag is not in motion, the position may be calculated and archived less frequently, such as every 2-6 hours.
- the tag If the tag is to determine its location, it locks onto the signals of several Navstar satellites 406 as supported by the GPS Receiver 203.
- the time and power typically used to acquire this data depends on the data provided by the Base Station.
- the tag's position is calculated 407, and reported to the Base Station 408, along with the tag's unique identification code and possibly data from devices such as temperature sensors integrated with the tag.
- the Base Station receives this data 409, and optionally sends commands 414 back to the tag to affect its next sleep cycle; for example, a tag that is planned to be moved soon may be commanded to wake up more frequently.
- the Base Station applies differential corrections 410, and posts the results 41 1 to application software through some combination of messages between computers and/or writing the data to a database.
- the tag determines the amount of time it should go to sleep, saves status information necessary to efficiently implement the next cycle (such as current tag position), and goes to sleep 412 for the prescribed period.
- the Base Station(s) can be mobile, installed in one or several of the vehicles that move with the tagged personnel and assets. Since the Base Station is mobile, it is not possible to use a fixed surveyed position as a basis for providing differential corrections as shown in Figure 2. Instead, the Base Station ' s position is determined using a commercially available Differential GPS receiver. From this reference position, the relative positions of other individual tags in range (which do not include differential GPS hardware for cost and power reasons) can be accurately assessed and archived.
- Figure 5 shows the operation of a Mobile Base Station 502. GPS tags 202 operate as in Figure 2, sending data 212 to the Mobile Base Station for processing.
- the Mobile Base Station includes a Differential GPS Receiver 506.
- Differential GPS options are commercially available; with the choice driven by the local services available and the accuracy required.
- Data from the Differential GPS Receiver is used to apply Differential Corrections 505 to all data received by the Comm Radio 504.
- the data may be processed locally, such as for display in the Mobile Base Station's vehicle.
- the Mobile Base Station is part of a fleet of such vehicle-mounted devices, the data is transmitted 507 to a Host where all tag data is consolidated into a software application.
- a replica of the process described in Figure 3 whereby initialization and command data is transmitted from the Mobile Base Station 502 to the GPS Tag 202.
- a tag carried by rescue workers may operate in several modes. Outdoors, the tag operates like a GPS Tag 202. and its location is tracked in reference to base station(s) in surveyed locations and/or mobile base stations in range. Once the worker goes indoors and out of GPS range, the system may record the tag's last known location.
- An enhanced GPS Tag may also incorporate inertial technology and report cumulative changes in position since the GPS signal was lost.
- the tag's GPS-based location can again be fixed in reference to a base station. This is shown in Figure 6. When operating outdoors, the tag continuously calculates its own location 601 using GPS, and reports this location to the Base Station 602.
- differential corrections may be applied at the base station. If the tag loses contact with the GPS satellites 603, it switches to inertial tracking 604, continuously calculating cumulative inertial motion 605 and reporting this information to the Base Station 606.
- the Base Station combines the inertial information with the last known GPS-based location to estimate the worker ' s location within the building. When GPS signals again become available 607, the tag reports GPS information to the Base Station.
- the Com Radio 204 and 206 for a tag designed for rescue workers should be selected for its ability to penetrate construction material. Since these tags can be recharged between uses, power management is not a major consideration. Therefore, a relatively high power and low frequency radio is preferred, such as found in communication devices commonly used by rescue workers.
- a handheld device can be used to find the tag.
- the handheld device commands a particular tag to emit an encoded radio and/or an ultrasonic beacon signal, and then displays the signal strength of the radio and/or ultrasonic beacon.
- the operator of the handheld unit finds the tag by noticing an increased signal strength as he or she moves closer to the tag.
- the handheld is relatively close to the beacon signal, as indicated by a high signal strength, the operator commands the tag to emit an audible signal.
- GPS can be used for location tracking.
- GPS can be used to archive the tag's location, which is downloaded periodically through a cell phone or in batch mode when the tag returns within the range of the base station.
- an RTLS infrastructure within the building determines the tag's location, using a low-cost transponder within the tag. 4.
- an approximate location of the tag can be inferred by a tag's ability to connect with the base station. For example, if 802J 1 is used as the communications stage, and the indoor space is covered by 802.11 in order to support voice communications and or RTLS, the tag's approximate location can be ascertained by identifying the base station that is currently in communication with the tag. Accuracy in the range of 100-200 feet can be achieved, with improvements by using directional antennas and variations in signal strength.
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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)
- Mechanical Engineering (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU49878/00A AU4987800A (en) | 1999-05-06 | 2000-05-04 | An asset and personnel tagging system utilizing gps |
EP00932102A EP1206757A1 (fr) | 1999-05-06 | 2000-05-04 | Systeme d'identification de biens et de personnes au moyen d'un gps |
CA002391285A CA2391285A1 (fr) | 1999-05-06 | 2000-05-04 | Systeme d'identification de biens et de personnes au moyen d'un gps |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13277299P | 1999-05-06 | 1999-05-06 | |
US60/132,772 | 1999-05-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000068907A1 true WO2000068907A1 (fr) | 2000-11-16 |
Family
ID=22455521
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2000/012297 WO2000068907A1 (fr) | 1999-05-06 | 2000-05-04 | Systeme d'identification de biens et de personnes au moyen d'un gps |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1206757A1 (fr) |
AU (1) | AU4987800A (fr) |
CA (1) | CA2391285A1 (fr) |
WO (1) | WO2000068907A1 (fr) |
Cited By (42)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003032501A2 (fr) * | 2000-12-22 | 2003-04-17 | Seekernet Incorporated | Formation de reseaux en systeme de suivi de biens en fonction de la classe de biens |
US6693585B1 (en) | 2002-02-07 | 2004-02-17 | Aradiant Corporation | Self-contained selectively activated mobile object position reporting device with reduced power consumption and minimized wireless service fees. |
US6745027B2 (en) | 2000-12-22 | 2004-06-01 | Seekernet Incorporated | Class switched networks for tracking articles |
WO2004097447A1 (fr) * | 2003-04-29 | 2004-11-11 | Telenor Asa | Systeme et methode pour gerer la consommation d'energie d'un dispositif de tracage |
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EP1794545A4 (fr) * | 2004-09-28 | 2010-10-20 | Trimble Navigation Ltd | Procede et systeme de commande d'un article mobile |
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US8514058B2 (en) | 2008-08-18 | 2013-08-20 | Trimble Navigation Limited | Construction equipment component location tracking |
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US9532310B2 (en) | 2008-12-25 | 2016-12-27 | Google Inc. | Receiver state estimation in a duty cycled radio |
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CA2391285A1 (fr) | 2000-05-04 |
AU4987800A (en) | 2000-11-21 |
EP1206757A1 (fr) | 2002-05-22 |
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