WO2000041404A3 - Efficient demodulation techniques for a wireless location system - Google Patents

Efficient demodulation techniques for a wireless location system Download PDF

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Publication number
WO2000041404A3
WO2000041404A3 PCT/US1999/029506 US9929506W WO0041404A3 WO 2000041404 A3 WO2000041404 A3 WO 2000041404A3 US 9929506 W US9929506 W US 9929506W WO 0041404 A3 WO0041404 A3 WO 0041404A3
Authority
WO
WIPO (PCT)
Prior art keywords
location system
channel
wireless location
receiver
receiver system
Prior art date
Application number
PCT/US1999/029506
Other languages
French (fr)
Other versions
WO2000041404A2 (en
Inventor
Louis A Stilp
James D Haverty
Joseph W Sheenan
Original Assignee
Trueposition 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
Priority claimed from US09/227,764 external-priority patent/US6184829B1/en
Application filed by Trueposition Inc filed Critical Trueposition Inc
Priority to AU23591/00A priority Critical patent/AU2359100A/en
Publication of WO2000041404A2 publication Critical patent/WO2000041404A2/en
Publication of WO2000041404A3 publication Critical patent/WO2000041404A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/0205—Details
    • G01S5/021—Calibration, monitoring or correction
    • 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
    • G01S5/06—Position of source determined by co-ordinating a plurality of position lines defined by path-difference measurements
    • 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
    • G01S1/022—Means for monitoring or calibrating
    • G01S1/026—Means for monitoring or calibrating of associated receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/90—Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/50—Connection management for emergency connections

Abstract

An inventive method is used in controlling the manner in which signals are demodulated in a Wireless Location System having a plurality of receiver systems (10-2A, 2B, 2C) distributed throughout a coverage area. Each of the receiver systems (10-2A, 2B, 2C) demodulates received signals carried on one of a prescribed set of reverse channels. The method comprises providing a master receiver system for each of the reverse channels, wherein the recorder receiver system(s) for any channelreceives but does not demodulate signals received on that channel. In addition, the method includes providing a slave receiver system for any channel demodulate signals received on that channel. The slave receiver system provides redundancy and thus improves the reliability of the location system.
PCT/US1999/029506 1999-01-08 1999-12-13 Efficient demodulation techniques for a wireless location system WO2000041404A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU23591/00A AU2359100A (en) 1999-01-08 1999-12-13 Efficient demodulation techniques for a wireless location system

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US09/227,764 US6184829B1 (en) 1999-01-08 1999-01-08 Calibration for wireless location system
US09/227,764 1999-01-08
US22867399A 1999-01-12 1999-01-12
US09/228,673 1999-01-12

Publications (2)

Publication Number Publication Date
WO2000041404A2 WO2000041404A2 (en) 2000-07-13
WO2000041404A3 true WO2000041404A3 (en) 2000-09-21

Family

ID=26921737

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/029506 WO2000041404A2 (en) 1999-01-08 1999-12-13 Efficient demodulation techniques for a wireless location system

Country Status (2)

Country Link
AU (1) AU2359100A (en)
WO (1) WO2000041404A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8838139B2 (en) 1999-01-08 2014-09-16 Trueposition, Inc. Advanced triggers for location-based service applications in a wireless location system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA3042942C (en) 2016-10-05 2023-01-03 Exxonmobil Chemical Patents Inc. Method for producing metal nitrides and metal carbides
WO2018067276A1 (en) 2016-10-05 2018-04-12 Exxonmobil Chemical Patents Inc. Method for producing metal nitrides and metal carbides
CN113453798A (en) 2019-02-28 2021-09-28 埃克森美孚化学专利公司 Catalyst composition and precursor, process for preparing the same and process for converting synthesis gas

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5155590A (en) * 1990-03-20 1992-10-13 Scientific-Atlanta, Inc. System for data channel level control
US5428667A (en) * 1993-03-11 1995-06-27 Harris Corporation Multi-channel cellular communications intercept system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5155590A (en) * 1990-03-20 1992-10-13 Scientific-Atlanta, Inc. System for data channel level control
US5428667A (en) * 1993-03-11 1995-06-27 Harris Corporation Multi-channel cellular communications intercept system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8838139B2 (en) 1999-01-08 2014-09-16 Trueposition, Inc. Advanced triggers for location-based service applications in a wireless location system
US9288628B2 (en) 1999-01-08 2016-03-15 Trueposition, Inc. Advanced triggers for location-based service applications in a wireless location system

Also Published As

Publication number Publication date
AU2359100A (en) 2000-07-24
WO2000041404A2 (en) 2000-07-13

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