| US 7,532,161 B2 | ||
| Method and apparatus for wide area augmentation system having L1/L5 bias estimation | ||
| Po-Hsin Hsu, Irvine, Calif. (US); Laura A. Cheung, Pasadena, Calif. (US); and Mohinder S. Grewal, Anaheim Hills, Calif. (US) | ||
| Assigned to Raytheon Company, Waltham, Mass. (US) | ||
| Filed on Sep. 22, 2005, as Appl. No. 11/232,575. | ||
| Prior Publication US 2007/0067073 A1, Mar. 22, 2007 | ||
| Int. Cl. H04B 7/185 (2006.01); G01S 5/14 (2006.01) | ||
| U.S. Cl. 342—358 [342/357.03] | 18 Claims |
| 1. A method, comprising:
receiving an estimate of L1 iono delay and L1 iono delay rate;
receiving GEO slant ionospheric delay for a GEO satellite;
receiving user iono vertical error (UIVE) information for the GEO satellite that reflects accuracy of the GEO slant ionospheric
delay; and
computing a L1/L5 bias estimate from the estimate of L1 iono delay and L1 iono delay rate and GEO slant ionospheric delay
as
−(1 −(L1 frequencŷ2/L5 frequencŷ2))* (GEO slant iono delay−estimated L1 iono delay−estimated L1 iono delay rate )/2.
|