WO1998003881A1 - Differential ground station repeater - Google Patents
Differential ground station repeater Download PDFInfo
- Publication number
- WO1998003881A1 WO1998003881A1 PCT/US1996/012221 US9612221W WO9803881A1 WO 1998003881 A1 WO1998003881 A1 WO 1998003881A1 US 9612221 W US9612221 W US 9612221W WO 9803881 A1 WO9803881 A1 WO 9803881A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- aircraft
- information
- transmitters
- transmitter
- transmission
- 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
- G01S19/01—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
Definitions
- the present invention relates to ground station equipment for use with Differential Global Positioning Systems (DGPS) which utilize signals from a plurality of satellites to determine various parameters of aircraft operation such as position, attitude, velocity and the rates of change of these parameters and which provide correction information for satellite specific pseudo range errors.
- DGPS Differential Global Positioning Systems
- FIG. 1 For simplicity a simple prior art system is shown herein in Figure 1 in which an aircraft 10 is shown receiving signals from four remote satellites (FS1 , FS2, FS3, and FS4) over paths shown by arrows 12, 14, 16 and 18 respectively.
- GPS receiver equipment aboard aircraft 10 can operate on the signals to determine the desired aircraft parameters (position, speed, attitude and the rates of change parameters etc.) useful in the navigation thereof.
- the signals from the satellites may contain errors herein referred to as "satellite-specific pseudo range errors" which errors cause inaccuracies in the determination of the aircraft parameters.
- DGPS receivers shown in Figure 1 as box 20 having an antenna 22 located at a fixed position which is known with great accuracy.
- DGPS receiver 20 is shown as having a receiving antenna 22 which receives information from the satellites that are within it's view and, in the present case, from the four satellites FS1, FS2, FS3 and FS4 over paths shown as arrows 24, 26, 28 and 30. While a single antenna is shown in Figure 1, more than one and preferably three antennas may be used so that multipath distortions caused by nearby objects (building, trees etc.) can be minimized.
- DGPS receiver 20 calculates the ranges as determined from the satellites signals and sends this information via a connection shown as arrow
- Aircraft 10 can thereafter utilize the now known error information to modify it's own calculations of the aircraft parameters so that it is assured that the accuracy of it's calculation are accurate.
- Systems such as shown in Figure 1 may be used near or at various airports around the world to direct aircraft in for landings and, after landing, to direct aircraft in a taxi mode over the ground paths to a terminal. This signal is useful for aircraft in a region within a 100 mile circle with the center located at the antenna 22.
- antenna 40 may not be able to see all portions of an aircraft landing site due to obstructions from buildings and natural surroundings and 2) when several airports are located in relatively close proximity to each other, the signals being transmitted to the aircraft cannot cover the entire region.
- the current landing system (ILS) uses numerous frequencies in their band causing frequency congestion.
- the FAA has proposed that the first transmitter TX1 transmit it's information only during the sub-time slot 1 in each period of transmission while transmitter TX2 transmits it's information to the aircraft only during sub-time slot 2 of each transmission period and transmitter TX3 transmits it's information only during the sub-time slot 3 of each transmission period.
- transmitter TX1 transmits information only during the sub-time slot 1 in each period of transmission while transmitter TX2 transmits it's information to the aircraft only during sub-time slot 2 of each transmission period and transmitter TX3 transmits it's information only during the sub-time slot 3 of each transmission period.
- the present invention proposes that instead of utilizing a plurality of ground stations, one at each of the locations, that a single ground station be utilized for the entire region.
- the present invention proposes that a data link be connected between the single ground station and each of the transmitters which, since they are all operating on the same frequency, may utilize the same information with the only difference being that the information transmitted to the receivers be transmitted into the appropriate time slot allotted for that transmitter. This has the great advantage of reducing the number of
- the system then allows the reduction in the number of data link wraparound antennas and receivers such as 44 and 46 in Figure 1 since the only requirement is that the data link wraparound antenna be capable of receiving the signals from each of the transmitting antennas so as to provide the feedback signal to the ground station indicative of what was sent to the aircraft.
- This system also simplifies the airborne RX design when signals must be received from two transmitters, like during taxi guidance. This system can also increase system integrity for precision approach by providing dual active paths for transmission reliability which do not require a receiver frequency change.
- Figure 1 shows a prior art ground station system
- Figure 2 shows the suggestion proposed by the FAA for utilizing single frequency transmission from a multitude of transmitters by specific time slot allocation
- FIG. 3 shows a layout diagram of the present invention.
- an aircraft 10 which may be the same as aircraft 10 in Figure 1 is shown receiving signals from the four satellites FS1, FS2, FS3 and FS4 over paths shown by arrows 12, 14, 16 and 18 as was the case in connection with Figure 1.
- DGPS receiver 20 which may be the same as DGPS receiver 20 in Figure 1 is shown at a fixed and known location and having a receiving antenna 22 receiving information from the satellites FS1, FS2, FS3 and FS4 over paths 24, 26, 28 and 30 just as was the case in connection with Figure 1.
- DGPS receiver 20 produces a signal over a line shown as arrow 32 to a microprocessor 34 which calculates the satellite-specific pseudo range error signals and transmits this information over lines such as shown by arrows 52, 54 and 56 to remotely located transmitters TX1, TX2, and TX3 shown by boxes 58, 60 and 62 respectively.
- Transmission line 52, 54 and 56 may be hardwired, may be fiber optic or may be radio links whichever is most convenient under the circumstances.
- the remote transmitters 58, 60, and 62 may all be located at a single airport so as to provide unobscured vision of all of the aircraft from various angles to insure ground coverage or may be located at various airports around the general area to insure regional coverage.
- transmitter 58 may be located at the first of such airports, transmitter 60 may be located at the second of such airports and transmitter 62 may be located at the third of such airports.
- transmitter 58 may actually be two or more transmitters positioned at the single airport and the same may be true of transmitters TX2 and TX3. Accordingly, utilizing the FAA model as shown in Figure 3, anywhere up to eight separate transmitters can be utilized to cover the area desired. Of course, it more transmitters were needed, more frequencies would be required.
- transmitter TX1 utilizing an antenna 68 transmits the satellite-specific pseudo range error information to the aircraft 10 as shown by arrow 70.
- transmitter 60 utilizing an antenna 74 transmits the error information to the aircraft 10 as shown by arrow 76
- transmitter 62 utilizing an antenna 80 transmits the error information to aircraft 10 as shown by arrow 82.
- All of the antennas 68, 74 and 80 utilize the same frequency but utilize different sub-time slots as shown in Figure 3. Accordingly, aircraft 10 receives signals from any one or all of these sources on a single frequency and can determine which transmitter is sending the signals and, thus, can utilize the information to provide the accurate determination of the aircraft parameters it needs.
- an antenna shown in Figure 3 as antenna 84 may be located in a position to receive the transmissions from all of the antennas 68, 74 and 80 over paths shown by arrows 86, 88 and 90 respectively. In most cases a single antenna may be used for this purpose but if this is not the case more than one antenna may be employed.
- the signals received by antenna 84 are connected to receiver 86 and are transmitted back to the ground station 20 via a connection shown as arrow 94.
- ground station repeater for a differential GPS system which minimizes the number of ground stations required and yet allows the use of a single frequency for transmission even in situations where more than one transmitter is sending signals to the aircraft at the same time.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96928792A EP0914619A1 (en) | 1996-07-24 | 1996-07-24 | Differential ground station repeater |
CA002257369A CA2257369C (en) | 1996-07-24 | 1996-07-24 | Differential ground station repeater |
JP10506887A JP2000514924A (en) | 1996-07-24 | 1996-07-24 | Differential ground station repeater |
PCT/US1996/012221 WO1998003881A1 (en) | 1996-07-24 | 1996-07-24 | Differential ground station repeater |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US1996/012221 WO1998003881A1 (en) | 1996-07-24 | 1996-07-24 | Differential ground station repeater |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998003881A1 true WO1998003881A1 (en) | 1998-01-29 |
Family
ID=22255509
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1996/012221 WO1998003881A1 (en) | 1996-07-24 | 1996-07-24 | Differential ground station repeater |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0914619A1 (en) |
JP (1) | JP2000514924A (en) |
CA (1) | CA2257369C (en) |
WO (1) | WO1998003881A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006110319A3 (en) * | 2005-03-28 | 2007-03-01 | Qualcomm Inc | Method and apparatus for enhancing signal-to-noise ratio of position location measurements |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101103757B1 (en) * | 2009-12-28 | 2012-01-06 | 한국항공우주연구원 | Method and Apparatus for Generating Pseudorange Correction Information |
RU2492525C1 (en) * | 2012-02-29 | 2013-09-10 | Владимир Григорьевич Шульгин | Aircraft instrument approach system based on radio beacons indicating beginning of landing strip |
RU2542325C1 (en) * | 2013-07-24 | 2015-02-20 | Олег Иванович Завалишин | Aircraft location method |
RU2715059C1 (en) * | 2019-10-02 | 2020-02-25 | Акционерное общество научно-внедренческое предприятие "ПРОТЕК" | Method of determining coordinates of an aircraft in a satellite-pseudo-satellites multi-position surveillance system |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0588598A1 (en) * | 1992-09-15 | 1994-03-23 | Navsys Corporation | GPS precision approach and landing system for aircraft |
WO1995015499A1 (en) * | 1993-12-03 | 1995-06-08 | Satloc, Inc. | Differential global positioning swath guidance system with dual row lightbar and flow controller apparatus and method |
US5428603A (en) * | 1993-05-17 | 1995-06-27 | Hughes Aircraft Company | Synchronous time division multiple access interrogate-respond data communication network |
-
1996
- 1996-07-24 JP JP10506887A patent/JP2000514924A/en not_active Ceased
- 1996-07-24 EP EP96928792A patent/EP0914619A1/en not_active Withdrawn
- 1996-07-24 CA CA002257369A patent/CA2257369C/en not_active Expired - Fee Related
- 1996-07-24 WO PCT/US1996/012221 patent/WO1998003881A1/en not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0588598A1 (en) * | 1992-09-15 | 1994-03-23 | Navsys Corporation | GPS precision approach and landing system for aircraft |
US5428603A (en) * | 1993-05-17 | 1995-06-27 | Hughes Aircraft Company | Synchronous time division multiple access interrogate-respond data communication network |
WO1995015499A1 (en) * | 1993-12-03 | 1995-06-08 | Satloc, Inc. | Differential global positioning swath guidance system with dual row lightbar and flow controller apparatus and method |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006110319A3 (en) * | 2005-03-28 | 2007-03-01 | Qualcomm Inc | Method and apparatus for enhancing signal-to-noise ratio of position location measurements |
US7920544B2 (en) | 2005-03-28 | 2011-04-05 | Qualcomm Incorporated | Method and apparatus for enhancing signal-to-noise ratio of position location measurements |
US8144682B2 (en) | 2005-03-28 | 2012-03-27 | Qualcomm Incorporated | Method and apparatus for enhancing signal-to-noise ratio of position location measurements |
EP2369881A3 (en) * | 2005-03-28 | 2012-06-06 | Qualcomm Incorporated | Method and apparatus for enhancing signal-to-noise ratio of position location measurements |
US8606220B2 (en) | 2005-03-28 | 2013-12-10 | Qualcomm Incorporated | Methods and apparatuses for transmitting and receiving position reference signals |
Also Published As
Publication number | Publication date |
---|---|
CA2257369A1 (en) | 1998-01-29 |
JP2000514924A (en) | 2000-11-07 |
EP0914619A1 (en) | 1999-05-12 |
CA2257369C (en) | 2005-08-30 |
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