Patent · US Expired

Method and system of determining user terminal position using multiple satellites

US6317077A · kind A · utility

16Cited by
3References
9Claims
0Family size

Assignee

Inventors

Key dates

Filing dateFeb 22, 2000
Grant dateNov 13, 2001
Priority date—
Expiry dateFeb 22, 2020

Classification

  • Technology area (CPC H)Electricity
  • CPC primaryH04B7/1855
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

In a satellite communication system (20), a method (50) and system of locating terrestrial-based user terminals (UTs). A UT (23) is located by a two-tier estimation procedure. Under this procedure, an initial estimate of the UT location is performed based on absolute signal propagation delay and Doppler shift measured from a communication link between a satellite and the UT. A second, refined estimate of the UT location is then performed based on the results of the initial estimate. The second estimate can be a function of the absolute propagation delay and absolute Doppler, as well as differential delay and differential Doppler measured from transmissions from two or more satellites (21-22) to the UT (23).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.