Patent ID: 7649494
Filing Date: 2010-01-19
Classification: G01S

Abstract:
1. A GPS receiver comprising: receiving means that receives GPS signals modulated by a navigation message; bit pattern signal generating means that predicts modulation of the GPS signals by the navigation message, and generates bit pattern signals corresponding to each of a plurality of bit patterns that differ from each other while making phases different at predetermined intervals, the number of the bit pattern signals corresponding to each of the plurality of bit patterns being obtained by dividing a 1-bit length of the navigation message by the predetermined interval, the predetermined interval being equal to or more than one cycle of C/A codes and less than the 1-bit length of the navigation massage; integrating means that integrates each of the bit pattern signals generated by the bit pattern signal generating means with the GPS signals received by the receiving means; and accumulative adding means that accumulatively adds signals output from the integrating means, the C/A codes being Clear and Acquisition codes or Coarse and Access codes.