WO2001040825A1 - Method of gps navigation and receiver - Google Patents
Method of gps navigation and receiver Download PDFInfo
- Publication number
- WO2001040825A1 WO2001040825A1 PCT/EP2000/011432 EP0011432W WO0140825A1 WO 2001040825 A1 WO2001040825 A1 WO 2001040825A1 EP 0011432 W EP0011432 W EP 0011432W WO 0140825 A1 WO0140825 A1 WO 0140825A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gps
- receiver
- gps receiver
- determining
- pseudoranges
- Prior art date
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
- 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
- G01S19/50—Determining position whereby the position solution is constrained to lie upon a particular curve or surface, e.g. for locomotives on railway tracks
Definitions
- This invention relates to a method of determining the position of a GPS receiver and a GPS receiver for the same.
- GPS is most notably associated with the Navigation System with Time and Ranging (NAVSTAR) GPS, an all weather, spaced based navigation system developed and operated by the US Department of Defense.
- NAVSTAR Navigation System with Time and Ranging
- GPS hereinafter refers to any global positioning system comprising a plurality of radio transmitters at different locations and a receiver which uses information relating to the time of arrival of transmissions of the radio transmitters in order to determine location.
- GPS Principles and Applications Editor, Kaplan
- ISBN 0-89006-793-7 Artech House hereinafter "Kaplan”.
- Kaplan GPS Principles and Applications
- pseudorange measurements are required in respect of at least four orbiting satellites. In situations where signals from only three orbiting satellites can be acquired, it is not normally possible to conclusively determine the position of the GPS receiver.
- a method of determining the position of a GPS receiver comprising the steps of (a) determining pseudoranges from at least four orbiting GPS satellites; (b) providing a pseudorange from a virtual satellite based at the centre of the earth to a previously known position of the GPS receiver; and (c) from the pseudoranges of (a) and (b), determining the position of the GPS receiver.
- a GPS receiver using a method according to the present invention comprising a receiver means for acquiring signals from at least four orbiting GPS satellites, and processing means for providing the pseudoranges of (a) and (b) and determining the position of the GPS receiver therefrom.
- the method of the present invention is particularly suitable for land based use of GPS receivers and especially for vehicle navigation. This is because during such use, the assumption of constant altitude since a last known position fix is reasonably safe, the land based user being in at least indirect contact with the earth's surface at least most of the time and changes in altitude take place relatively slowly.
- Figures 1 and 2 are graphs showing the positional error encountered using a method of determining the position of a GPS receiver according to the present invention compared to a conventional method, when between 3 and 7 signals from orbiting satellites are acquired; and Figure 3 shows, schematically, a GPS receiver implementing a method according to the present invention.
- pseudorange measurements p are made in respect of the four orbiting satellites in accordance with known methods.
- a further pseudorange is provided from a virtual satellite based at the centre of the earth to a previously known position of the GPS receiver.
- the virtual satellite position vector is (0, 0, 0)
- the virtual satellites velocity vector is (0, 0, 0) and its Doppler shift is zero.
- equations 2 to 6 are over determined (there being more equations than unknowns), the equations will be inconsistent in that errors in the pseudorange values will preclude any combination of location and time offset from exactly solving the equations.
- a conventional iterative technique based on linearisation may be employed to obtain a best estimate for the position of the GPS receiver in three dimensions (x u , y u , z ⁇ ) and the time offset t u between the receiver clock and the GPS system time.
- Such techniques are well known, for example, see chapter 2.4.2 of Kaplan, ibid.
- the positional error encountered using a method of determining the position of the GPS receiver according to the present invention has been compared to a conventional method using both real and simulated data, and when between 3 and 7 signals from orbiting satellites have been acquired.
- the real data was obtained by analysing conventional GPS equipment using the method of the present invention when acquiring NAVSTAR GPS signals for which selectively availability was operative and whereby the GPS receiver was stationary.
- the simulated data was obtained using conventional simulation equipment and was based on a moving vehicle scenario using precise satellite ephemeris data and associated pseudoranges.
- Figure 1 relates to real data and shows the position error E in metres on the ordinate axis against the number of orbiting satellites acquired j on the abscissa.
- Curve 1 shows the position error relating to a conventional method in which a position fix is generated based solely on signals acquired from the orbiting satellites. As such, at least four orbiting satellites signals are required.
- Curve 2 shows the position error related to a method according to the present invention.
- Figure 2 is as figure 1 except based on simulated data.
- Curves 3 and 4 show the position error relating to a conventional method of determining the position of a GPS receiver and a method according to the present invention respectively.
- Equations 1 to 5 describes a simplified model of pseudoranges for illustration purposes only.
- measured pseudorange errors arise due to many factors including atmospheric delay, receiver noise and resolution offset, multipath offset, receiver hardware offsets and selective availability degradation. These errors may be compensated for accordingly and are described in chapter 7.1.2 of Kaplan, ibid.
- FIG. 3 shows, schematically, a GPS receiver implementing a method according to the present invention.
- the GPS receiver is of a generally known architecture, comprising receiver means in the form of an antenna 5 and a signal pre-processor 6.
- radio frequency (RF) signals are received by the antenna and pre-processed in the pre-processor; typically by passive bandpass filtering in order to minimise out-of-band RF interference, preamplification, down converting to an intermediate frequency (IF) and analog to digital conversion.
- the GPS receiver further comprises processing means 7, 8, 9 in the form of several receiver channels 7, a receiver processor 8 and a navigation processor 9.
- the digitised IF signals are processed in each of the digital receiver channels and the satellite signals acquired and tracked in respective digital receiver channels in co-operation with the receiver processor.
- Such methods for acquisition and tracking are well known, for example, see chapter 4 (GPS satellite signal characteristics) & chapter 5 (GPS satellite signal acquisition and tracking), Kaplan ibid.
- the navigation processor 9 calculates the position of the receiver using a method according to the present invention, i.e. by providing a pseudorange from a virtual satellite based at the centre of the earth to a previously known position of the GPS receiver. The determined position is then conveyed to the user through a user interface 10, typically a visual display.
- the processing means 7, 8, 9 are conveniently provided in the form of either a general purpose microprocessor or a GPS application specific integrated circuit, and a method according to the present invention may be implemented using appropriate programming and configuring of such processing means.
- a general purpose microprocessor or a GPS application specific integrated circuit and a method according to the present invention may be implemented using appropriate programming and configuring of such processing means.
- programming and configuration is well known, and would be accomplished by a one of ordinary skill in the art of GPS without undue burden.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00979591A EP1149304A1 (en) | 1999-12-01 | 2000-11-15 | Method of gps navigation and receiver |
JP2001542234A JP2003515749A (en) | 1999-12-01 | 2000-11-15 | Method and receiver for GPS navigation |
KR1020017009633A KR20010101888A (en) | 1999-12-01 | 2000-11-15 | Method of gps navigation and receiver |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB9928357.4A GB9928357D0 (en) | 1999-12-01 | 1999-12-01 | Method of GPS navigation and receiver |
GB9928357.4 | 1999-12-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001040825A1 true WO2001040825A1 (en) | 2001-06-07 |
Family
ID=10865483
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2000/011432 WO2001040825A1 (en) | 1999-12-01 | 2000-11-15 | Method of gps navigation and receiver |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1149304A1 (en) |
JP (1) | JP2003515749A (en) |
KR (1) | KR20010101888A (en) |
GB (1) | GB9928357D0 (en) |
WO (1) | WO2001040825A1 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63134975A (en) * | 1986-11-27 | 1988-06-07 | Koden Electronics Co Ltd | Gps navigation arithmetic processing method, and gps navigation arithmetic processor using said method |
WO1999057575A2 (en) * | 1998-05-05 | 1999-11-11 | Snaptrack, Inc. | Method and system for using altitude information in a satellite positioning system |
-
1999
- 1999-12-01 GB GBGB9928357.4A patent/GB9928357D0/en not_active Ceased
-
2000
- 2000-11-15 WO PCT/EP2000/011432 patent/WO2001040825A1/en not_active Application Discontinuation
- 2000-11-15 JP JP2001542234A patent/JP2003515749A/en not_active Withdrawn
- 2000-11-15 KR KR1020017009633A patent/KR20010101888A/en not_active Application Discontinuation
- 2000-11-15 EP EP00979591A patent/EP1149304A1/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63134975A (en) * | 1986-11-27 | 1988-06-07 | Koden Electronics Co Ltd | Gps navigation arithmetic processing method, and gps navigation arithmetic processor using said method |
WO1999057575A2 (en) * | 1998-05-05 | 1999-11-11 | Snaptrack, Inc. | Method and system for using altitude information in a satellite positioning system |
Non-Patent Citations (3)
Title |
---|
ILSUN KIM ET AL: "GPS positioning using virtual pseudorange", CONTROL ENGINEERING PRACTICE, JAN. 1998, ELSEVIER, UK, vol. 6, no. 1, pages 25 - 35, XP000991465, ISSN: 0967-0661 * |
KAPLAN ET AL: "UNDERSTANDING GPS - Principles and Applications", BOSTON, MA: ARTECH HOUSE,US, 1996, pages 43 - 47, XP002162608, ISBN: 0-89006-793-7 * |
PATENT ABSTRACTS OF JAPAN vol. 012, no. 394 (P - 773) 20 October 1988 (1988-10-20) * |
Also Published As
Publication number | Publication date |
---|---|
EP1149304A1 (en) | 2001-10-31 |
KR20010101888A (en) | 2001-11-15 |
JP2003515749A (en) | 2003-05-07 |
GB9928357D0 (en) | 2000-01-26 |
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