Title:
METHOD AND APPARATUS FOR NON-COHERENT NAVIGATION USING LOW FRAME RATE TELEMETRY
Document Type and Number:
WIPO Patent Application WO2002065152
Kind Code:
A3
Abstract:
A method and apparatus for obtaining measurements, on a spacecraft that employs a transceiver, at intervals that are shorter than the telemetry frame duration for use in correcting ground-based Doppler measurements so as to remove the effects of drift in the spacecraft oscillator frequency reference. Samples of navigation counters on the spacecraft that supply information that may be used to compare the uplink frequency with the downlink frequency at the spacecraft are triggered at intervals that are shorter than the duration of a telemetry frame; the samples are then included in a telemetry frame and are time tagged after they are received on the ground; the time tagged samples are then used to calculate precise two-way Doppler measurements.
Inventors:
JENSEN JAMES R (US)
REINHART MATTHEW J (US)
FIELHAUER KARL B (US)
PENN JOHN E (US)
REINHART MATTHEW J (US)
FIELHAUER KARL B (US)
PENN JOHN E (US)
Application Number:
PCT/US2002/003234
Publication Date:
December 19, 2002
Filing Date:
February 04, 2002
Export Citation:
Assignee:
UNIV JOHNS HOPKINS (US)
JENSEN JAMES R (US)
REINHART MATTHEW J (US)
FIELHAUER KARL B (US)
PENN JOHN E (US)
JENSEN JAMES R (US)
REINHART MATTHEW J (US)
FIELHAUER KARL B (US)
PENN JOHN E (US)
International Classes:
G01S13/58; G01S13/76; G01S7/00; (IPC1-7): G01S13/58; G01S13/76
Foreign References:
| US5995039A | 1999-11-30 | |||
| US5745072A | 1998-04-28 | |||
| US5666108A | 1997-09-09 |
Other References:
REINHART M J ET AL: "The CONTOUR radio communications system", 2001 IEEE AEROSPACE CONFERENCE PROCEEDINGS (CAT. NO.01TH8542), BIG SKY, MT, USA, 10-17 MARCH 2001, 2001, Piscataway, NJ, USA, IEEE, USA, pages 1/81 - 91 vol.1, XP002215601, ISBN: 0-7803-6599-2
JENSEN J R ET AL: "Experimental verification of noncoherent Doppler tracking at the Deep Space Network", IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS, OCT. 2000, IEEE, USA, vol. 36, no. 4, pages 1401 - 1406, XP002215602, ISSN: 0018-9251
JENSEN J R ET AL: "Experimental verification of noncoherent Doppler tracking at the Deep Space Network", IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS, OCT. 2000, IEEE, USA, vol. 36, no. 4, pages 1401 - 1406, XP002215602, ISSN: 0018-9251
Download PDF: