The Problems of Transition to Single Sideband Techniques in Aeronautical Communications

Neither airborne self-contained nor ground-based air-navigation systems can by themselves completely meet the requirements of present day aircraft for both accuracy and continuity or positional and steering data. It is shown how dead-reckoning, providing continuity and reliability through the use of air-derived acceleration or velocity data, combined with intermittent "fixing" by employment of accurate position data obtained through the use of ground and stellar referenced sources, can increase operational capability without "pressing the state of the art" in any of the components of a system. Methods of inserting position fixes and of instrumenting the associated wind-computation and wind-memory functions are described and system errors are analyzed.