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:
Apr. 02, 2002
Filed:
Jun. 22, 1999
David S. Miller, Carlsbad, CA (US);
Nadav Levanon, Ramat-Gan, IL;
Avneesh Agrawal, San Jose, CA (US);
Qualcomm, Inc., San Diego, CA (US);
Abstract
A system and method for determining a round trip delay of signals transmitted between first and second objects, such as a satellite and a mobile telephone, that move relative to each other. A first signal is transmitted from the first object to the second object. The first signal is received at the second object after a propagation delay D , the delay D being the time taken by the first signal to traverse from the first object to the second object. A frequency of the first signal is measured at the second object. The second object then transmits to the first object a second signal containing a report of the measured first frequency. The second signal is received at the first object after a propagation delay D , D being the time taken by the second signal to traverse from the second object to the first object. The first object measures a frequency of the second signal. The first object then determines the range between the first and second object from the measured overall delay and the measured frequencies of the first and second signals.