Data processing: vehicles – navigation – and relative location – Navigation – Employing position determining equipment
Reexamination Certificate
2006-12-19
2006-12-19
Chin, Gary (Department: 3661)
Data processing: vehicles, navigation, and relative location
Navigation
Employing position determining equipment
C213S220000, C213S221000, C342S358000
Reexamination Certificate
active
07151999
ABSTRACT:
The present invention relates to terrain navigation wherein an earth-reflected satellite signal is received from at least one reference signal source whose position is known (120), for example a navigation satellite. Based on information contained in the received signal a measured estimate of a shortest reflection distance (d1(tb)) to the satellite (120) is derived. A relative spatial movement (Δx, Δy, Δh) of a relevant craft (110) since a previous positioning instance (ta) is registered onboard the craft (110). Moreover, stored surface information is retrieved pertaining to an elevation (h1b) of the earth surface (130) in relation to the mean sea level (z0) at at least one geographical position (X1b, Y1b). Based on the relative spatial movement (Δx, Δy, Δh) and the retrieved surface information at least one calculated estimate of the shortest reflection distance (d1(tb)) to the satellite (120) is derived. Finally, a geographical position (X1a, Y1a, h1a) is determined on basis of the measured and calculated estimates of the shortest reflection distance (d1(tb)). Thus, a highly reliable and entirely passive positioning may be accomplished on basis of external signals from as few satellites (120) as one.
REFERENCES:
patent: 6157891 (2000-12-01), Lin
patent: 6205400 (2001-03-01), Lin
patent: 6246960 (2001-06-01), Lin
patent: 6256559 (2001-07-01), Tsui
patent: 6427122 (2002-07-01), Lin
patent: 6449559 (2002-09-01), Lin
patent: 6512976 (2003-01-01), Sabatino et al.
patent: 6516272 (2003-02-01), Lin
John E. Pritchett and Alan J. Pue; Robust Guidance and Navigation for Airborne Vehicles Using GPS/Terrain Aiding; pp. 457-463; Position Location and Navigation Symposium, IEEE, 2000.
Chin Gary
Franklin Eric J.
SAAB AB
Venable LLP
LandOfFree
Passive terrain navigation does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Passive terrain navigation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Passive terrain navigation will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3719722