Patent ID: 9383450
Filing Date: 2016-07-05
CPC Classification: G01S

Claim Text:
1. An apparatus for generating a satellite navigation signal based on software, the apparatus comprising: an orbit data processing unit to calculate, based on receiver independent exchange format (RINEX) data, (i) visible satellite information, (ii) navigation data, (iii) a pseudo distance for each visible satellite, (iv) a Doppler for each visible satellite, and (v) a Doppler period; a navigation message processing unit to generate, for each visible satellite based on the navigation data, a navigation message frame required to generate a satellite navigation signal; and a signal generating unit to generate a satellite navigation signal of a digitized intermediate frequency for each visible satellite based on (i) the navigation message frame for each visible satellite, (ii) the pseudo distance for each visible satellite, and (iii) the Doppler for each visible satellite during the Doppler period, wherein the signal generating unit includes at least one Digitally Controlled Oscillator (DCO) used to generate the satellite navigation signal, and wherein the Doppler period calculator calculates the Doppler period according to equation: where b denotes a duration of a Doppler period, a denotes a predetermined Doppler displacement, T