CODE DELAY ESTIMATION MOTHOD OF SOFTWARE GPS RECEIVER

摘要

PURPOSE: A code delay estimation method of a software GPS receiver is provided to accurately estimate code delay using a carrier Doppler frequency, thereby improving performance. CONSTITUTION: A carrier Doppler frequency after a predetermined time is estimated about each satellite shown in an initial time point after signal tracking reaches to the steady state(S100). The slope of a code phase is calculated using the estimated carrier Doppler frequency(S200). The code phase after predetermined time is estimated using the code phase and slope at the initial time point(S300).