The Differential Vector Phase-Locked Loop for Global Navigation Satellite System Signal Tracking

A novel differential vector phase-locked loop (DVPLL) is derived that takes GNSS code-phase and carrier-phase measurements from a base station and uses them to maintain an integer ambiguity resolved quality solution directly in the vector tracking loop of a rover receiver. The only state variables estimated and used to create the replica code and carrier signals from the base station measurements are three position and two clock states for a static test. Closing the individual loops solely through the navigation filter makes this a pure vector method. For short baselines, where differential atmospheric errors are small, the DVPLL can be used on single-frequency data. An L1-only live-sky static test was performed using the method resulting in a 3D accuracy of 5.3 mm for an 18.5 m baseline. An acquisition algorithm is also developed to initialize the DVPLL. The algorithm performs a search in the space-time domain vice the measurement domain. An upper bound on the failure rate of the algorithm can be set by the user. The algorithm was tested on 24-h dual- and single-frequency CORS data sets with close to a 100% success rate and on a 15- min data set of single-frequency IF samples with a 100% success rate

Phase-locked Loop Dynamics in the Presence of Noise by Fokker-planck Techniques

Phase error behavior of phase-locked loop tracking system in presence of gaussian noise determined by fokker-planck equatio

Time Domain Simulations of Arm Locking in LISA

Arm locking is a technique that has been proposed for reducing laser frequency fluctuations in the Laser Interferometer Space Antenna (LISA), a gravitational-wave observatory sensitive in the milliHertz frequency band. Arm locking takes advantage of the geometric stability of the triangular constellation of three spacecraft that comprise LISA to provide a frequency reference with a stability in the LISA measurement band that exceeds that available from a standard reference such as an optical cavity or molecular absorption line. We have implemented a time-domain simulation of arm locking including the expected limiting noise sources (shot noise, clock noise, spacecraft jitter noise, and residual laser frequency noise). The effect of imperfect a priori knowledge of the LISA heterodyne frequencies and the associated 'pulling' of an arm locked laser is included. We find that our implementation meets requirements both on the noise and dynamic range of the laser frequency.Comment: Revised to address reviewer comments. Accepted by Phys. Rev.

A design study for an optimal non-linear receiver/demodulator Final report

Design study for optimal nonlinear receiver demodulato

A space communications study Final report, 15 Sep. 1966 - 15 Sep. 1967

Investigation of signal to noise ratios and signal transmission efficiency for space communication system

Threshhold analysis of phase locked loops

Computer technique for predicting threshold in phased locked loops with and without frequency modulatio

Optical synchronization-phase locking with shot noise processes Interim technical report

Optical communication synchronization with phase lock tracking loop and analysis of shot noise processe

Length sensing and control strategies for the LCGT interferometer

The optical readout scheme for the length degrees of freedom of the LCGT interferometer is proposed. The control scheme is compatible both with the broadband and detuned operations of the interferometer. Interferometer simulations using a simulation software Optickle show that the sensing noise couplings caused by the feedback control can be reduced below the target sensitivity of LCGT with the use of feed forward. In order to improve the duty cycle of the detector, a robust lock acquisition scheme using auxiliary lasers will be used.Comment: 13 pages 9 figures. A proceedings paper for Amaldi9 conferenc