Raytheon Co. completed the preliminary system acceptance test for the GPS Aided GEO Augmented Navigation-Technology Demonstration System, the company announced July 18.

The system checks GPS signals for errors as well as generates correction messages to improve the accuracy of the data. During the test, average accuracy was better than one meter horizontally and slightly more than one meter vertically, surpassing the 7.6 meter requirement, Raytheon said.

The demonstration was part of the first phase of a project by the Indian Space Research Organization (ISRO) and Airports Authority of India. The program, which will be used to provide space-based navigation in Indian airspace, consists of a monitor and control center and separate uplink station located in Bangalore, India, and eight reference stations distributed throughout the country. Raytheon supplied the subsystems, installed the units and integrated the system through data links provided by ISRO and the Airports Authority.

The next step for the program involves integrating the ground elements with a geosynchronous satellite to demonstrate a signal-in-space broadcast of messages.