Review of code and phase biases in multi-GNSS positioning

A review of the research conducted until present on the subject of Global Navigation Satellite System (GNSS) hardware-induced phase and code biases is here provided. Biases in GNSS positioning occur because of imperfections and/or physical limitations in the GNSS hardware. The biases are a result of small delays between events that ideally should be simultaneous in the transmission of the signal from a satellite or in the reception of the signal in a GNSS receiver. Consequently, these biases will also be present in the GNSS code and phase measurements and may there affect the accuracy of positions and other quantities derived from the observations. For instance, biases affect the ability to resolve the integer ambiguities in Precise Point Positioning (PPP), and in relative carrier phase positioning when measurements from multiple GNSSs are used. In addition, code biases affect ionospheric modeling when the Total Electron Content is estimated from GNSS measurements. The paper illustrates how satellite phase biases inhibit the resolution of the phase ambiguity to an integer in PPP, while receiver phase biases affect multi-GNSS positioning. It is also discussed how biases in the receiver channels affect relative GLONASS positioning with baselines of mixed receiver types. In addition, the importance of code biases between signals modulated onto different carriers as is required for modeling the ionosphere from GNSS measurements is discussed. The origin of biases is discussed along with their effect on GNSS positioning, and descriptions of how biases can be estimated or in other ways handled in the positioning process are provided.QC 20170922</p

Historical Dictionary of Scandinavian Cinema

Scandinavian cinema—consisting of films produced in Norway, Sweden, Denmark, Finland, and Iceland—has been the source of some of the world's most interesting films—The Seventh Seal, Dancer in the Dark, and The Girl with the Dragon Tattoo—and most influential directors—Ingmar Bergman and Lars von Trier. The Historical Dictionary of Scandinavian Cinema covers the history of the Nordic countries through a chronology, introductory essays on each country, and an extensive bibliography. The dictionary section has over 400 cross-referenced entries on major persons and films, pan-Scandinavian entries on film genres, themes, and subjects such as animation, ethnicity, migration and censorship. This book is an excellent access point for students, researchers, and anyone wanting to know more about Scandinavian cinema