The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 18, 2002
Filed:
Dec. 05, 2000
Robin P. Giffard, Los Altos, CA (US);
Agilent Technologies, Inc., Palo Alto, CA (US);
Abstract
The ionospheric delay of a GPS signal transmitted by a first satellite having an obliquity is measured autonomously and substantially in real-time by receiving a code range, a carrier phase range and a satellite elevation angle for each of at least two satellites. For each of the at least two satellites, a code-phase divergence between the code range and the carrier phase range is calculated, an obliquity is calculated from the satellite elevation angle and time derivatives of the code-phase divergence and of the obliquity are calculated. A zenith delay is calculated from the obliquities, the time-derivatives of the obliquities and the time-derivatives of the code-phase divergences of the at least two satellites. The ionospheric delay is calculated by multiplying the obliquity of the first satellite and the zenith delay.