Patent ID: 7283091

Claim:
A radio positioning system, comprising: at least three system units for determining a plurality of radio signal times-of-arrival (TOA)s, respectively, for a radio positioning signal received from a mobile unit; a server for using said radio signal TOAs for computing jointly a radio positioning system (RPS)-based time for a time-of-transmission (TOT) of said radio positioning signal and an RPS-based position of said mobile unit; and a system transceiver for transmitting a radio system signal having said RPS-based time and said RPS-based position to said mobile unit for use by said mobile unit for acquiring a global navigation satellite system (GNSS) signal; and wherein: the code range selector includes a bootstrap clock for determining a local elapsed time from a time-of-transmission (TOT) of said radio positioning signal and a GNSS time estimator for combining said local elapsed time with said RPS-based time for providing an RPS-based GNSS time estimate; the code range selector using said RPS-based GNSS time estimate for selecting said code search range.