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WO1999019742A1 - Procede et appareil de surveillance - Google Patents

Procede et appareil de surveillance Download PDF

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Publication number
WO1999019742A1
WO1999019742A1 PCT/IL1998/000376 IL9800376W WO9919742A1 WO 1999019742 A1 WO1999019742 A1 WO 1999019742A1 IL 9800376 W IL9800376 W IL 9800376W WO 9919742 A1 WO9919742 A1 WO 9919742A1
Authority
WO
WIPO (PCT)
Prior art keywords
sru
msu
spread spectrum
unit
units
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/IL1998/000376
Other languages
English (en)
Inventor
Daniel Aljadeff
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP98937749A priority Critical patent/EP1021733A1/fr
Priority to JP2000516240A priority patent/JP2001520387A/ja
Priority to CA002303074A priority patent/CA2303074A1/fr
Priority to AU86445/98A priority patent/AU8644598A/en
Publication of WO1999019742A1 publication Critical patent/WO1999019742A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/86—Combinations of radar systems with non-radar systems, e.g. sonar, direction finder
    • 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
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
    • G01S1/04—Details
    • G01S1/045—Receivers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/12—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves by co-ordinating position lines of different shape, e.g. hyperbolic, circular, elliptical or radial

Definitions

  • the present invention relates to the monitoring, tracking and searching of
  • invention relates to a system that combines monitoring, two-way messaging
  • the main methods are:
  • GPS Global Positioning System
  • GPS satellites calculates its absolute position.
  • the calculated coordinates are then transmitted by any wireless communication means to a center or person who wants to know the location of the person with the GPS
  • means used for data transmission of the calculated GPS coordinates are usually mobile radio, satelhte and cellular telephone networks.
  • GPS system may be used worldwide, a given commercial system is
  • LEO Low Earth Orbit
  • Multi-lateration systems These systems use land-based fixed base
  • the located unit transmits its
  • This location system is limited to well defined areas covered by the ground base stations and due to its system architecture it has a limited capability
  • the unit is
  • the location is basically calculated by
  • the base station greater than a predetermined threshold distance.
  • the base station is connected to a telephone line and alerts the police or the security personnel
  • a low power tag worn by the parole which transmits an ID signal to a field monitoring device, that reports to a host computer via a cellular
  • a small transmitter secured to the body of the confinee including ⁇ a small transmitter secured to the body of the confinee, a remote
  • a prison or a power plant as a prison or a power plant, and comprise means for broadcasting a distress signal if the person wearing the device is in danger.
  • a distress signal if the person wearing the device is in danger.
  • system for monitoring personnel in an institution such as a correctional facility, hospital, school or military installation, and includes a computer
  • the invention provides a monitoring, tracking and searching system
  • the system consist of two or more portable units that maintain between
  • Each unit may monitor, track and
  • Units with monitoring, tracking and searching functions include spread
  • the units with monitoring, tracking and searching capabilities
  • All the system preferably operate in the ISM band, which is used in the US
  • monitoring and monitored units are portable and in some cases integrated
  • type of units include two-way messaging capabilities that enable them to
  • the units communicate each to other using spread spectrum
  • narrow band interference sources that may be present in the working band.
  • the units may use diversity antennae to improve even more
  • the units of this system can achieve a superior performance than those of the
  • the monitoring unit measures the distance to one or more monitored units
  • the measured distance may be
  • Both unit may display the measured
  • preprogrammed functions i.e. activation of alarms or external signals, transmission of messages between the units
  • Distance measurement is performed periodically or when requested by
  • the monitoring unit may at any time track, search and locate the monitored unit using the directional antenna and the distance measurement
  • monitored units may use the measured distance transmitted to them to search the monitoring unit. This capability is also possible.
  • Monitoring units may also have this feature to facilitate and speed-up the searching process.
  • Monitoring units may rely information to other monitoring units and in that way enhance the distance and effectiveness of the monitoring, tracking and
  • the monitored and/or searching units can be any suitable searching process.
  • the monitored and/or searching units can be any suitable searching process.
  • Fig. 1 schematically shows a monitored/searched unit (MSU),
  • Fig. 2 schematically shows a monitoring and searching unit (SRU)
  • Fig. 3 schematically shows a monitoring and searching unit (SRU) with directional antenna array, according to a preferred embodiment of the
  • Fig. 4 schematically shows a monitoring and searching unit (SRU)
  • Fig. 5 schematically shows a monitoring, tracking and searching unit
  • Fig. 6A and 6B illustrate the correlator units of the MSU and SRU,. according to a preferred embodiment of the invention
  • Fig. 7 illustrates an MSU or SRU according to another preferred
  • Fig. 8 illustrates an MSU according to another preferred embodiment
  • Fig. 9 illustrates an SRU according to a preferred embodiment of the.
  • Fig. 10 schematically shows a number of antenna direction indicators
  • Fig. 11 shows transmit/receive timing
  • Fig. 12 shows frequency hopping messaging, according to another
  • Fig. 13 illustrates a network operation according to another preferred embodiment of the invention.
  • Fig. 14 is a flowchart illustrating an acquisition process according to
  • Fig. 15 is a flowchart illustrating a search process according to a
  • Figs. 1 - 15 consists of two basic units:
  • the monitored/searched unit - MSU The monitored/searched unit - MSU;
  • MSU and SRU may be implemented in several ways
  • the digital section includes a microprocessing means 1 which consists of a processor, memories for storing
  • I/O ports Part of these I/O ports are connected to a display means 2, used to display messages, alarms, controls, etc., an audio means 3 used to reproduce prerecorded or synthesized audio messages
  • microprocessing means may exchange data with other electronic unit
  • This microprocessing 1 means controls
  • the clocks generator unit 7 is controlled by the microprocessor 1
  • the microprocessor memoriea
  • ROM read only memory
  • EPROM electrically erasable programmable read-only memory
  • EEPROM electrically erasable programmable read-only memory
  • the radio section consists of the following units: a. an antenna or set of
  • antennas 9, to receive and transmit data including an antenna selector 10 controlled 16 by the microprocessor 1, b.
  • a T/R switch 11 used to connect
  • the antenna input to the transmitter 12 or receiver 13 also controlled 16 by
  • Received Data Signal Strength indicator 19 which is connected to the microprocessor 1 and is controlled by the microprocessor 1 via a control, clocks and status bus 20, d. a spread spectrum transmitter 12 which
  • a synthesizer unit 8 used to generate IF and RF
  • a correlator 17 also controlled by the microprocessor 1
  • the correlating means 17 processes the I and Q signals 14 generated by the receiver 13 and synchronizes itself to the received spreading sequence in order to perform two basic functions: a.
  • microprocessor 1 1. b. Generation of synchronization timing that enables the
  • Transmitted data 21 is generated by the
  • Sequence Spreader 15 As may be seen from Fig. 1, the Control, Clocks and
  • Status bus 20 interconnects between most of the MSU units enabling the distribution of clocks, timing, control and status signal among those units.
  • the MSU may use a single omnidirectional or directional antenna or a set of
  • antennae 9 used to improve the reception in some environments where fading or other interference conditions exist. In those cases, the use of
  • the antenna or set of antennae may be internal (preferably a printed
  • antenna or it may be external, connected directly to the unit or mounted on
  • the MSU includes a battery and a DC-DC converter (not shown in the
  • FIG. 2 which has a similar architecture to the
  • the SRU has the ability to use a directional antenna
  • the basic SRU may use two types of
  • antenna a. an omnidirectional antenna for monitoring and b. when
  • the omnidirectional antenna is replaced by a
  • directional antenna is used for both monitoring and searching functions.
  • An additional embodiment (as shown in Fig. 3) includes an array of directional antennas 42 (preferably, but not limited to, between 3-8
  • This array of antennas is preferably implemented by printed antennas, which significantly simplifies the construction and
  • this unit may use external
  • antennae of many types including retractable units or antenna units
  • the SRU includes a delay measurement
  • circuit 32 which measures the time elapsed from the beginning of the first transmitted sequence to the beginning of one or more of the received
  • This delay measurement circuit is initialized and activated 34 by
  • the spreading means 15 (indicating that the first sequence is being
  • the value of the delay is
  • values may be averaged to improve the accuracy of the measured delay.
  • the SRU may at any time, operate as an MSU, and in that case, the time
  • the SRU When operating, and referring to Fig. 2, the SRU transmits a signal that - includes (among other information) a unique identifier of the MSU being
  • This ID is specially coded into the spread spectrum signal in a
  • the spread spectrum signal transmitted preferably includes a PN sequence for each
  • the ID consists preferably of a 24 bit number enhanced by an 8 bit error correcting code.
  • Each of the enhanced 32-bit ID is preferably of a 24 bit number enhanced by an 8 bit error correcting code.
  • SRU receives the MSU response it measures the elapsed time by comparing
  • the SRU includes a smart card interface 50, allowing it to read and write
  • Those smart cards 51 may
  • the SRU can monitor, track or search
  • Information written into the card may include
  • an MSU may include a
  • the SRU and MSU units can support setup
  • this serial interface 6 may, but not limited
  • Setup is done using a friendly program, that guides the user how to program different system and unit parameters.
  • the SRU will include an interface to a bar
  • code reader which can read small amounts of data including units ID's, user
  • This bar code reader will be preferably an internal bar code reader but it may be also an external reader, e.g. connected to the serial interface 6, as shown in Fig. 1-4.
  • an external bar code reader is
  • both MSU and SRU units may support serial communication interface to several type of external units (including RS-232,
  • FIG. 5 shows a special embodiment of the SRU (but it
  • the SRU or MSU are packaged according to PCMCLA. standards which enables any portable computer to be used as an
  • Fig 6 shows a block diagram of the MSU and SRU correlating means used to detect the spreading sequence received, identify the received ID, decode the
  • correlating means consists of Pseudo Random Sequence Matched Filter 62
  • a message decoder 63 used to decode the received messages and generate a Received Data signal 68
  • an ID combiner 64 used to add the pseudo random sequences in the right polarity according to ⁇ the unit ID, an_
  • Matched Filter 62 is fed from I 60 and Q 61 signals received from the RF
  • the SRU correlator includes basically the same blocks as the MSU correlator (Fig. 6A), but preferably includes additional logic
  • Path # -1 Sampling 72 Path # 0 Sampling 73
  • Path # 1 Sampling 74 The same I and Q signals are fed to a Multipath
  • Detection and Estimation means 75 which controls 76 the sampling circuits
  • a Timing Detection and Estimation means 80 uses the Path Combiner/Selector 79 output to provide the liming of the received message.
  • microprocessor (not shown in this Figure) performs the control of all the
  • Received messages are decoded by the Message Decoder 77 which generates a Received Data signal 81 connected to the microprocessor.
  • the SRU preferably adapts its operating parameters according to the unit
  • the SRU is able to perform, and not hmited to, an
  • the monitoring interval period of a specific MSU will be preferably in the
  • this frequency may preferably
  • the SRU may change the spreading chip rate, data rate, PN
  • Distance measuring uses preferably an averaging filter, which may be
  • MSU perform a multipath elimination or reduction by analyzing the
  • distance measurement improvement may also be achieved by estimating the
  • Fig. 7 comprises of a small case 100 preferably of
  • pocket preferably a spring clip on the back of the unit (not shown in Fig. 7). It also comprises of an alphanumeric display 101, used to display: received
  • a keypad 104 comprising of a
  • the user may program or select, which of the audio
  • the alphanumeric display has an optional back-light which improves the reading capabilities at low "
  • the unit is turned ON and OFF preferably by a small slide
  • the unit has an
  • antenna preferably an integrated antenna, inside the unit, but in some
  • an external antenna may be pulled out from the
  • the unit is a unit or connected to the unit through an external connector.
  • the unit is a unit or connected to the unit through an external connector.
  • a low battery indication warns the operator about low battery condition.
  • Fig. 8 illustrated in Fig. 8, comprises of a watch-style case 110 attached to a strap
  • the unit functions are
  • the unit is preferably made of plastic, preferably with an average
  • Fig. 9 shows an additional preferred embodiment more suitable for the SRU.
  • a hand-held unit 121 comprising a case body 122 and a cover 123 electrically connected to the said body.
  • the body comprises of an-
  • alphanumeric and graphic display 124 used to display received messages
  • serial interface connector 131 used to connect external units for
  • the user may program or select, which of the audio signals, if any, he desires to hear " and the alphanumeric display, has an optional back-light which improves the reading capabilities at low hght conditions.
  • this unit may program or select, which of the audio signals, if any, he desires to hear " and the alphanumeric display, has an optional back-light which improves the reading capabilities at low hght conditions.
  • the card may also include a smart card interface and means for enabhng insertion of
  • the cover 123 includes a built-in array of directional antennae used to detect the direction of the received message.
  • the cover to an horizontal position, and the display 133 will show the direction.
  • This indicator has a number of pointing indicators 142 equal to the number of
  • the SRU displays the direction and the quahty of the reception by illuminating the corresponding pointing indicator.
  • the reception quahty is
  • partial illumination represents VPQ - VERY POOR QUALITY 145, LQ -
  • Another preferred embodiment will include an integrated mechanical or electronic compass, allowing the unit to align its direction
  • This calculated azimuth may also be transmitted to other units and used as a reference to improve the searching process.
  • the unit has an antenna, preferably an integrated antenna, inside the unit cover, but in some
  • an external antenna may be pulled out from the
  • the unit is a unit or connected to the unit through an external connector.
  • the unit is a unit or connected to the unit through an external connector.
  • range calculation is performed by calculating the
  • the transmitted signal - TS 151 includes n pseudo random sequences
  • nominated S#l to S#n The number of sequences is not fixed (preferably
  • the elapsed time is calculated as follows:
  • Elapsed Time Time Stamp of Received Signal Correlation - Time Stamp of
  • the elapsed time is measured in clock units, being the clock, the chip rate clock.
  • the chip rate is 20 MHz
  • the actual delay time between the TS and RS is calculated as follows:
  • n an integer number, calculated as the highest integer
  • Both SRU and MSU units have the optional capabihty of transmitting and receiving frequency hopping signals. Frequency hopping are used in
  • the SRU caUs the MSU with a Call Message - CM U#l-
  • CM Call Message
  • the proposed system may be configured differently according the specific apphcation ranging from a very basic system
  • SRU maintains continuous communication with all monitored MSU's and measures the distance to each of the units. In parallel, it opens its receiver
  • the SRU measures the distance to each of the
  • the SRU may notify the user, indicating that this specific MSU is outside the pr ⁇ r
  • the SRU may send a
  • the message may include the measured
  • the monitoring process may start automatically or manually after MSU's
  • the SRU user may setup different parameters for the monitoring of each MSU or group of MSU's, or use the system default
  • the monitoring process performs all its monitoring functions keeping the communication channel as free as
  • each MSU will be programmed to send a monitoring request to
  • the SRU at programmed intervals (preferably from seconds to several
  • the MSU is normally in standby mode, and only as a result of an MSU
  • Pre-programmed events may for instance be
  • either the SRU or MSU may initiate
  • the SRU will periodically or upon request, prepare a report
  • the SRU may also notify the user when an expected -passive monitoring
  • action from a specific MSU is not performed within a programmed time period from the previous monitoring action.
  • the SRU user has the option to start a search operation in order to find a
  • the searched MSU user may be notified that he is being
  • the MSU may be continuously notified that the SRU is
  • SRU or MSU user notifications about the search process progress may be
  • Audible notification A variable frequency or loudness beep may
  • the user may hear the beep preferably
  • Color LED's will indicate if the SRU is
  • some SRU's or MSU's may include an alphanumeric, numeric or analog display indicating the
  • the search result indicators will be set according to an internal
  • each new measurement is weight-averaged with previous
  • the SRU has the option to continuously measure the distance and direction only to
  • the SRU user is able to move the unit to different directions and
  • the SRU includes a set of directional antennas that may be selected by the microprocessor.
  • the processor will receive signals from each of the antennas and process them.
  • the MSU direction will be displayed
  • the search operating mode will be normally initiated by the SRU user in order to find the location of a specific MSU. However, it is possible to start a
  • the SRU will enter into this mode after an abnormal
  • MSU request Some of the MSU's may request a passive SRU search
  • the passive search process may be performed simultaneously to several
  • the SRU or MSU is able to store the distance measured at a reference point
  • the user may store the measured distance at a known
  • MSU or SRU may keep the distance readings in each of the reference points.
  • a Search process 220 may be started automatically
  • Search process is initiated, the initial parameters are set 221, including search mode, communication parameters, search interval, alert/notification options, event history recording options and other setup parameters.
  • the SRU transmits a search message 223
  • the SRU checks if
  • the SRU analyzes its quahty 230 and if acceptable process the answer 232.
  • the SRU will preferably modify part of the search parameters
  • thresholds are also preferably adapted to the actual communication quahty.
  • search flag is active 233 and then, search parameters are updated 234
  • the SRU may also send, at
  • the SRU may initiate an acquisition process intended to establish hnk
  • the SRU will modify some of the channel parameters in
  • the user is notified by any of the audio-visual indicators. If defined by the
  • an Acquisition process 200 is started in order to acquire data.
  • the initial communication parameters are set 201, including
  • the SRU transmits a call message 203 and
  • the SRU checks if the
  • the SRU analyzes its quahty 211 and if it is acceptable, it processes the
  • the SRU will preferably modify part of the
  • the received signal For example, as previously explained for the search process, the received signal
  • thresholds are also preferably adapted to the actual communication quahty.
  • measuring may be used for two-way communication between any two units
  • All messages include preferably destination and sender description as well as error correction codes adapted to the channel used. All non-broadcast
  • Non-received messages or uncorrectable messages are preferably acknowledged in order to ensure that messages are properly received. Non-received messages or uncorrectable messages are preferably acknowledged in order to ensure that messages are properly received.
  • Received messages may also be used to control output lines and unit
  • a message may also be sent as a result of an
  • MSU being turned OFF (the message is sent before the unit is turned OFF) or when the unit is turned ON.
  • the message code is transmitted, while the unit receiving the message code
  • a mechanical vibrator is used to notify the user that a message
  • the message code is used to generate a
  • This voice message (using an internal voice synthesizer). This voice message is
  • each unit in the system is based on default parameters programmed during or after the manufacturing process. The user is able to
  • MSU units have a simple setup, while SRU units allow the user to specify monitoring, tracking, searching and messaging parameters.
  • SRU units allow the user to specify monitoring, tracking, searching and messaging parameters.
  • each SRU may be setup to operate as an MSU (in conjunction with its SRU- functions).
  • the SRU has the capabihty to remote setup an MSU using
  • one MSU may be monitored by several SRU's and
  • the MSU will have a hst of all active SRU's. After the log-in process with a specific MSU is completed, both units will enter into the
  • MSU will transmit a user identification (name, place, etc.) that will enable
  • the SRU user to easily identify each of the MSU users.
  • Log-out of unmonitored units may be performed manually or automatically
  • Testing of the system is performed as a routine operation, during units
  • Testing includes, but is not hmited to, one or more of the following:
  • Both SRU and MSU units are designed to allow some degree of fault- tolerance, according to the apphcation and cost limitations.
  • the SRU may automatically initiate
  • One MSU 183 may be monitored and searched by several SRU 180- 181 units;
  • This relay function increases the effective range units can be monitored or searched and the system
  • each SRU plays a role of master or slave SRU and
  • MSU or SRU units may be used to broadcast
  • the network operation may include the
  • GPS Ground Positioning System
  • two or more SRU's equipped with such GPS receivers enable to calculate the actual position of the searched unit (the
  • azimuth indication may help to resolve ambiguities.
  • An alphanumeric display is used to display alphanumeric data necessary for the operation of
  • the typical display as shown in Figs. 7 and 9, preferably includes 2-4 rows
  • MSU units preferably include a smaller one-row display.
  • Audio indicators are intended to alert the user about unexpected events or
  • the audio indicators may, but is not hmited to, be a buzzer capable to sound different types of chirps, speaker, headphones, etc..
  • Another preferred embodiments will include a numeric or
  • purpose sensors e.g. biomedical sensors, vending machines sensors, security
  • sensors, etc. may be attached and enhance the system capabilities. Due to

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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)
  • Radar Systems Or Details Thereof (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Navigation (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)

Abstract

L'invention concerne un système de recherche, de suivi et de surveillance portatif. Ce système comprend une ou plusieurs unités surveillées et/ou recherchées (MSU) et une ou plusieurs unités de surveillance et recherche (SRU). Les unités MSU comprennent des moyens de traitement, des moyens de mémorisation, des moyens de visualisation et/ou audio, une antenne d'émission/réception, un récepteur à large spectre pour recevoir les données modulées à large spectre et les transformer en données de bande de base, un émetteur à large spectre, un distributeur de données, un synthétiseur ou générateur de fréquences et un corrélateur pour corréler les données à large spectre reçues par ledit récepteur à large spectre à la séquence connue de pseudo-bruit. En outre, les unités SRU comprennent des moyens de traitement, des moyens de mémorisation, des moyens de visualisation e/ou audio, une antenne omnidirectionnelle d'émission/réception, une antenne directionnelle d'émission/réception, un récepteur à large spectre pour recevoir les données modulées à large spectre et les transformer en données de bande de base, un émetteur à large spectre, un distributeur de données, un synthétiseur ou générateur de fréquences, un corrélateur pour corréler les données à large spectre reçues par ledit récepteur à large spectre avec une séquence de pseudo-bruit connue, et des moyens de mesure du retard, pour mesurer le temps écoulé entre le début d'une première séquence transmise jusqu'au début d'une ou de plusieurs des séquences reçues à partir d'une unité MSU en réponse à ladite première séquence transmise.
PCT/IL1998/000376 1997-10-09 1998-08-13 Procede et appareil de surveillance Ceased WO1999019742A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP98937749A EP1021733A1 (fr) 1997-10-09 1998-08-13 Procede et appareil de surveillance
JP2000516240A JP2001520387A (ja) 1997-10-09 1998-08-13 監視方法及び監視装置
CA002303074A CA2303074A1 (fr) 1997-10-09 1998-08-13 Procede et appareil de surveillance
AU86445/98A AU8644598A (en) 1997-10-09 1998-08-13 Monitoring method and apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL12193297A IL121932A (en) 1997-10-09 1997-10-09 Monitoring method and apparatus
IL121932 1997-10-09

Publications (1)

Publication Number Publication Date
WO1999019742A1 true WO1999019742A1 (fr) 1999-04-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IL1998/000376 Ceased WO1999019742A1 (fr) 1997-10-09 1998-08-13 Procede et appareil de surveillance

Country Status (7)

Country Link
EP (1) EP1021733A1 (fr)
JP (1) JP2001520387A (fr)
CN (1) CN1277676A (fr)
AU (1) AU8644598A (fr)
CA (1) CA2303074A1 (fr)
IL (1) IL121932A (fr)
WO (1) WO1999019742A1 (fr)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001338386A (ja) * 2000-05-29 2001-12-07 Sony Corp 近距離無線情報提供方法及び近距離無線情報提供装置
EP1170598A1 (fr) * 2000-07-04 2002-01-09 Asulab S.A. Procédé de commande d'un dispositif de navigation et dispositif de navigation mettant en oeuvre ce procédé
EP1172663A3 (fr) * 2000-06-28 2002-01-30 Texas Instruments Incorporated Système sans fil pour l'indication de la localisation et de la direction comprenant plusieurs dispositifs
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GB2460916A (en) * 2008-06-20 2009-12-23 Honeywell Int Inc Portable tracking for determining relative positions of autonomous vehicles.
WO2013008063A1 (fr) * 2011-07-12 2013-01-17 Nokia Corporation Positionnement d'un appareil à l'aide de signaux radio
WO2013049102A1 (fr) * 2011-09-28 2013-04-04 Silverplus, Inc. Dispositif de suivi de position à faible consommation d'énergie doté de capacités de localisation et de transmission dans une combinaison de réseau étendu et de réseau à courte distance
US8811199B2 (en) 2009-11-06 2014-08-19 Rosemount Inc. Location detection in a wireless network
WO2020060967A1 (fr) * 2018-09-18 2020-03-26 Roku, Inc. Identification de caractéristiques audio d'une pièce à l'aide d'un code d'étalement
US10931909B2 (en) 2018-09-18 2021-02-23 Roku, Inc. Wireless audio synchronization using a spread code
US10958301B2 (en) 2018-09-18 2021-03-23 Roku, Inc. Audio synchronization of a dumb speaker and a smart speaker using a spread code

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CN100338478C (zh) * 2002-08-19 2007-09-19 Q－Track股份有限公司 用于近场电磁测距的系统和方法
KR20070032570A (ko) * 2005-09-16 2007-03-22 삼성전자주식회사 네트워크 시스템에서의 접속방법 및 그 시스템
KR100993733B1 (ko) * 2008-12-11 2010-11-10 이상선 Ｒｆｉｄ 태그를 이용한 위치확인 시스템
CN101750604B (zh) * 2008-12-17 2012-03-21 财团法人资讯工业策进会 即时定位系统及其方法
WO2017193252A1 (fr) * 2016-05-09 2017-11-16 深圳市沃特沃德股份有限公司 Appareil, système et procédé d'enregistrement et de présentation de piste de déplacement d'animal
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WO2001074034A3 (fr) * 2000-03-28 2002-07-18 Ericsson Inc Fonction de localisation a la demande pour terminal mobile
US6553236B1 (en) 2000-03-28 2003-04-22 Ericsson Inc. On demand location function for mobile terminal
JP2001338386A (ja) * 2000-05-29 2001-12-07 Sony Corp 近距離無線情報提供方法及び近距離無線情報提供装置
EP1172663A3 (fr) * 2000-06-28 2002-01-30 Texas Instruments Incorporated Système sans fil pour l'indication de la localisation et de la direction comprenant plusieurs dispositifs
EP1170598A1 (fr) * 2000-07-04 2002-01-09 Asulab S.A. Procédé de commande d'un dispositif de navigation et dispositif de navigation mettant en oeuvre ce procédé
US6694276B2 (en) 2000-07-04 2004-02-17 Asulab Sa Method for controlling a navigation device and navigation device implementing the same
WO2003058574A1 (fr) * 2002-01-08 2003-07-17 Moreno Fernandez Maria Montser Systeme de controle de la presence d'objets et d'etres vivants dans une zone de localisation
US7006838B2 (en) 2002-11-27 2006-02-28 Cognio, Inc. System and method for locating sources of unknown wireless radio signals
WO2007084673A3 (fr) * 2006-01-17 2008-02-07 Lottrak Inc Procédé et système pour localiser des objets à l'intérieur d'une zone géographique spécifiée
US7948439B2 (en) 2008-06-20 2011-05-24 Honeywell International Inc. Tracking of autonomous systems
GB2460916A (en) * 2008-06-20 2009-12-23 Honeywell Int Inc Portable tracking for determining relative positions of autonomous vehicles.
US8811199B2 (en) 2009-11-06 2014-08-19 Rosemount Inc. Location detection in a wireless network
WO2013008063A1 (fr) * 2011-07-12 2013-01-17 Nokia Corporation Positionnement d'un appareil à l'aide de signaux radio
WO2013049102A1 (fr) * 2011-09-28 2013-04-04 Silverplus, Inc. Dispositif de suivi de position à faible consommation d'énergie doté de capacités de localisation et de transmission dans une combinaison de réseau étendu et de réseau à courte distance
US8937554B2 (en) 2011-09-28 2015-01-20 Silverplus, Inc. Low power location-tracking device with combined short-range and wide-area wireless and location capabilities
US10931909B2 (en) 2018-09-18 2021-02-23 Roku, Inc. Wireless audio synchronization using a spread code
WO2020060967A1 (fr) * 2018-09-18 2020-03-26 Roku, Inc. Identification de caractéristiques audio d'une pièce à l'aide d'un code d'étalement
US10958301B2 (en) 2018-09-18 2021-03-23 Roku, Inc. Audio synchronization of a dumb speaker and a smart speaker using a spread code
US10992336B2 (en) 2018-09-18 2021-04-27 Roku, Inc. Identifying audio characteristics of a room using a spread code
US11438025B2 (en) 2018-09-18 2022-09-06 Roku, Inc. Audio synchronization of a dumb speaker and a smart speaker using a spread code
US11558579B2 (en) 2018-09-18 2023-01-17 Roku, Inc. Wireless audio synchronization using a spread code
US11671139B2 (en) 2018-09-18 2023-06-06 Roku, Inc. Identifying electronic devices in a room using a spread code
US12155408B2 (en) 2018-09-18 2024-11-26 Roku, Inc. Identifying electronic devices in a room using a spread code

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IL121932A (en) 2000-06-01
CN1277676A (zh) 2000-12-20
EP1021733A1 (fr) 2000-07-26
CA2303074A1 (fr) 1999-04-22
AU8644598A (en) 1999-05-03
IL121932A0 (en) 1998-03-10
JP2001520387A (ja) 2001-10-30

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