Methods and systems for validating positions reported in AIS message signals by fitting
Suitably chosen functions to signal characteristic data, Such as timing and Doppler shift …

BACKGROUND 0003. The Automatic Identification System (AIS) is a maritime
communications system designed for short-range (typically 20-30 nautical miles) ship-to …

A quadrature transmitter is described that comprises: a first transmitter path and a second
transmitter path that are matched. Each transmitter path comprises: at least one input …

SCREENASMESSAGESTOREMOWE DUPLICATES bines the sensor signals into the
predetermined number of mathematical combinations to produce a plurality of Zone signals …

Methods and apparatuses are presented for harmonic reject upconverting a baseband
signal using at least one quadrature passive upconversion mixer. In some embodiments, an …

Various embodiments of systems and methods for generating local oscillator (LO) signals for
a harmonic rejection mixer are provided. One embodiment is a system for generating local …

A quadrature transmitter includes a first and second matched transmitter path. Each
transmitter path receives respective sets of quadrature baseband signals. At least one local …

Circuits and methods for performing harmonic rejection mixing are provided. In some
embodiments, the circuit comprises: a first amplifier that amplifies a received signal at a first …

US PATENT DOCUMENTS FOREIGN PATENT DOCUMENTS 5,233,358 A 8/1993 Murphy
EP 2O24754 5/2007 5,280,498 A 1/1994 Tymes et al. JP 2003109.200 4/2003 5,359,521 A …

A mixer includes, an input current generation unit generating an input current; a first path
circuit unit including n number of transistors having sources connected in common to an …