Abstract: Systems and methods for clock synchronization are disclosed. A client synchronization system (CSS) may transmit RF pulses to a server CSS over micrometeorite ionization trail (MMIT) channels, and may receive RF pulses from the server CSS over MMIT channels, each received RF pulse following transmitted RF pulse. The client CSS may receive from the server CSS over MMIT channels measurement data including pulse arrival times at the server CSS. The measurement and transmission data may be correlated to identify RF-pulse pairs, each pairing a transmitted RF pulse received by the server CSS with a received RF pulse received from the server CSS, both over the same MMIT. TWTT analysis may be applied to timing data the pairs to compute time offsets between a client clock and a server clock. An analytical model of clock drift may be applied to the offsets to synchronize the client clock to the server clock.

Abstract: The present invention relates to a method and apparatus for estimating relative position in a global navigation satellite system. In one embodiment, a method for estimating a position of a first receiver relative to a second receiver in a global navigation satellite system includes obtaining a first set of measurements from the first receiver, where the first set of measurements estimates a first distance between the first receiver and a satellite in the global navigation satellite system, obtaining a second set of measurements from the second receiver, where the second set of measurements estimates a second distance between the second receiver and a satellite in the global navigation satellite system, performing time domain recursive filtering in accordance with the first set of measurements and the second set of measurements, and estimating the position of a first receiver relative to a second receiver in accordance with the time domain recursive filtering.

Abstract: A method of and computer readable medium for obtaining sub least significant bit phase accuracy in a digitally controlled oscillator by choosing a phase angle, &thgr;; solving the base equation Ap+Bq=1 for A, wherein values of p and q are relatively prime components of a least significant bit; and computing a command value, k, from the command equation k=A*nint(q&thgr;)mod(q).

Abstract: Disclosed are methods of transferring satellite ephemeris data for a first GNSS satellite from a pseudolite to a GNSS receiver. Also disclosed are pseudolites and GNSS receivers implementing the same. A first satellite global positioning signal transmitted by the first GNSS satellite is received at the pseudolite. The pseudolite transmits a pseudolite global positioning signal containing the satellite ephemeris data for the first GNSS satellite. The GNSS receiver receives the pseudolite global positioning signal and retrieves from the pseudolite signal the satellite ephemeris data.