Accession Number : AD0672587

Title :   LANE IDENTIFICATION IN THE OMEGA SYSTEM.

Descriptive Note : Interim rept. no. 2,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s) : Brogden, J. W. ; Luken, K.

Report Date : 02 MAY 1968

Pagination or Media Count : 91

Abstract : Omega is a long-range, very-low-frequency hyperbolic radio navigation system for use by aircraft, ships and submarines. Coverage for the entire earth will be provided by eight transmitters operating at the base frequency of 10.2 kiloHertz (kHz). One of the characteristics of the system is that phase information repeats itself from one hyperbolic lane to the next. The first step in resolving this lane ambiguity is the use of 13.6 and 10.2 kHz transmissions which produce a 3.4 kHz difference frequency having a lane width of three times the 10.2 kHz lane or approximately 24 miles. The second step is to identify the correct 3.4 kHz lane. Using 11-1/3 kHz transmissions with the 10.2 kHz transmissions, the 1133-1/3 Hertz (Hz) difference frequency will again increase the periods between ambiguity by a factor of three to approximately 72 miles. On the basis of repeatability, the data show that with proper propagation corrections the 3.4 kHz and 1133-1/3 Hz difference frequencies can resolve 10.2 kHz lanes with the 72 miles for more than 95 percent of the time. (Author)

Descriptors :   *OMEGA NAVIGATION, (*RADIO NAVIGATION, VERY LOW FREQUENCY), (*HYPERBOLIC NAVIGATION, RADIO SIGNALS), IDENTIFICATION, ACCURACY, RESOLUTION, CORRECTIONS, EXPERIMENTAL DATA.

Subject Categories : Air Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE