| US 7,499,485 B2 | ||
| Method and apparatus for detecting GPS data-bit boundaries and detecting GPS satellite-signal reception | ||
| Dong-Sik Cho, Suwon-si (Korea, Republic of) | ||
| Assigned to Samsung Electronics Co., Ltd., Suwon-Si (Korea, Republic of) | ||
| Filed on Dec. 17, 2004, as Appl. No. 11/16,596. | ||
| Claims priority of application No. 10-2003-0093550 (KR), filed on Dec. 19, 2003. | ||
| Prior Publication US 2005/0135463 A1, Jun. 23, 2005 | ||
| Int. Cl. H04B 1/00 (2006.01) | ||
| U.S. Cl. 375—150 [375/142; 375/343] | 25 Claims |
| 1. A method for detecting a data-bit boundary in a satellite data stream in a pulse train of a global positioning satellite
(GPS) signal, the pulse train being a product of the satellite data stream and a Pseudo-Noise (PN) code sequence, comprising:
(a) calculating a correlation integral between the pulse train and a replica Pseudo-Noise (RPN) code to sequentially output
M first correlation integral values and M second correlation integral values;
(b) comparing the K-th first correlation integral value with the K-1-th first correlation integral value, to change the K-th
first correlation integral value;
(c) comparing the K-th second correlation integral value with the K-1-th second correlation integer value to change the K-th
second correlation integer value;
(d) calculating the sum of the changed K-th first correlation integral value and the changed K-th second correlation integral
value;
(e) generating a K-th variation value according to the calculated sum;
repeating steps (b) through (e) while K is sequentially incremented from 2 to M; and
detecting a data-bit boundary based on the variation values.
|