| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a satellite positioning system capable of finding signal receiving position at ultra-high sensitivity and good responseness even for an attenuated satellite reception signal. <P>SOLUTION: A receiver terminal comprises a pseudo pattern 22 for storing a pseudo pattern A, a storage 7 where a replica PN sign is stored, a first calculation part 8 which makes the pseudo pattern A act to change polarity of the PN sign, a second calculation part 9 for synchronous adding of the PN signal whose polarity is changed, a third calculation part 10 for correlation calculation with the synchronous addition PN signal having been added synchronously and the replica PN sign, and a pseudo distance detecting device 19 which detects a correlation peak value and a delay value corresponding to the correlation peak value resulting from the correlation calculation, and acquires a pseudo distance from the delay value. Since the polarity of reception PN signal is equalized with the pseudo pattern A, sensitivity is improved by synchronous addition and correlation calculation. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
