The enhancement of INS alignment using GPS measurements

Author

Park, Joon Goo ; Kim, Jinwon ; Lee, Jang Gyu ; Park, Changook ; Jee, Gyuin ; Oh, Jong Taek

Author_Institution

Sch. of Electr. Eng., Seoul Nat. Univ., South Korea

fYear

1998

fDate

20-23 Apr 1998

Firstpage

534

Lastpage

540

Abstract

The integrated GPS/INS system has been adopted in many navigation systems for its synergistic results. As an application of the GPS/INS integration, the alignments of strap-down INS (SDINS) utilizing GPS carrier phase and differential phase rate measurements are introduced. An observation model of double-differenced GPS carrier phase and differential phase rate measurements is newly derived in order to be used with the SDINS alignment process. The performance of the INS/GPS combined system is analyzed through covariance analysis. Consequently, the covariance analysis results confirm that all states of the differential phase rate measurements combined system can be estimated more efficiently than that of the only carrier phase combined system even in case of 1 baseline and 4 visible satellites

Keywords

Global Positioning System; aircraft navigation; covariance analysis; error analysis; inertial navigation; measurement errors; measurement theory; phase measurement; GPS measurements; INS alignment enhancement; carrier phase measurements; covariance analysis; differential phase rate measurements; integrated GPS/INS system; navigation systems; observation model; strap-down INS; Automatic control; Communication system control; Global Positioning System; Navigation; Observability; Performance analysis; Phase estimation; Phase measurement; Position measurement; Sensor systems;

fLanguage

English

Publisher

ieee

Conference_Titel

Position Location and Navigation Symposium, IEEE 1998

Conference_Location

Palm Springs, CA

Print_ISBN

0-7803-4330-1

Type

conf

DOI

10.1109/PLANS.1998.670209

Filename

670209