SOFTWARE BASED SATELLITE NAVIGATION SIGNAL GENERATION APPARATUS AND A METHOD THEREOF FOR DECREASING DOPPLER CALCULATION TIME THROUGH DIFFERENTIAL APPLICATION OF A DOPPLER PERIOD

摘要

PURPOSE: A software based satellite navigation signal generation apparatus and a method thereof are provided to reduce Doppler update time by differently determining a Doppler update period required for signal generation suitable for Doppler variation and to improve signal generation performance by generating a generation signal to reduce a Doppler update period.;CONSTITUTION: An orbit data processing unit(110) calculates visible satellite information, a pseudo-range for each visible satellite, Doppler and a Doppler period for each visible satellite using received RIDEX(Receiver Independent EXchange Format) data. A navigation message processing unit(120) generates a navigation message frame for each satellite to generate a satellite navigation signal through navigation data received from the orbit data processing unit. A signal generation unit(130) generates a satellite navigation signal of a digital intermediate frequency for each visible satellite using the navigation message frame, a pseudo-range for each visible satellite and Doppler for each visible satellite during a Doppler period.;COPYRIGHT KIPO 2013;[Reference numerals] (110) Orbit data processing unit; (120) Navigation message processing unit; (130) Signal generation unit; (AA) RINEX data; (BB) IF satellite navigation signal