EVALUATION OF LORAN RECEIVING SET AN/APN-145.

• Main Author: Kups,Edward F.
• Other Authors: FEDERAL AVIATION AGENCY ATLANTIC CITY N J
• Format: Text
• Language: English
• Published: 1963
• Subjects: *RADIO NAVIGATION; LORAN; PERFORMANCE(ENGINEERING); STABILITY; RELIABILITY(ELECTRONICS); ERRORS; FLIGHT TESTING; TRACKING; AIRCRAFT ANTENNAS; RADIOFREQUENCY INTERFERENCE; AN/APN-145; C-131 AIRCRAFT; Loran; North Atlantic
• Online Access: http://www.dtic.mil/docs/citations/AD0422038; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0422038

Flight tests were conducted using a C-131 Convair aircraft with an AN/APN-145 Loran receiving set installed in the cabin area. The flight evaluation determined the operational performance of the receiver and the accuracy of the Loran time-difference positon fixes. An aerial camera was used for locating the position of the aircraft near specific landmarks. An analysis of the flight data was made to determine the difference between the Loran values recorded during flight and the calculated land-Loran values for each photographed position of the aircraft. The mean error for all position fixes was approximately one-half nautical mile with a standard deviation of 1833 feet. The ability of the equipment to automatically track Loran A and C signals over a period of time was evaluated. On a flight to Bermuda, the navigator operated the receiver on Loran-C and provided position corrections to the pilot to maintain the course of the aircraft within a specified narrow corridor. It was concluded that the equipment performed reliably during the twenty-eight hours of flight testing, and would be a suitable aid to air navigation and position reporting in the North Atlantic Area providing certain equipment and Loran-C System deficiencies were corrected. (Author)