Abstract: A method of enhancing signal tracking in a global positioning system receiver utilizing a frequency banked filter in providing code and carrier tracking loops includes acquiring a continuous time global positioning signal and separating the continuous time global positioning signal into in-phase and quadrature signals I and Q. The signals I and Q are sampled over a predetection interval (PDI) to provide discrete time signals, and the discrete time signals are used to generate a component in-phase measurement and a component quadrature measurement for each of multiple PDI segments of one PDI. For each of multiple different frequency bins, composite in-phase and quadrature measurements are generated by combining component in-phase measurements and component quadrature measurements from the PDI.

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 is a method which synchronizes a slave time with a master time. The master time is derived from a received signal. The master time is compared to the slave time to detect any offset of the slave time relative to the master time. If an offset is detected, the slave time is adjusted to correct the offset. Also disclosed is a method of synchronizing a pseudolite transmitter time with GNSS time. The transmitter time is compared to GNSS time to detect any offset of the transmitter time. The transmitter time is adjusted to correct the offset if an offset is detected. Also disclosed is an improved pseudolite. The pseudolite has a pseudolite transmitter and GNSS receiver. The pseudolite transmitter time is synchronized with GNSS time.

Abstract: A spread-spectrum demodulation system which can separate known incoming broad-band signals from a received signal, allowing separation of interfering signals and acquisition and tracking of multiple signals with widely varying power. Each signal is despread using a locally generated code, and then separated by narrow-band excision. The effect of that locally generated code on each of the remaining signals is eliminated by mixing again with a locally generated code.