Author/Authors :
Tymoshchuk, O.M. Kyiv Institute of Marine Transport of the State University of Infrastructure and Technologies, Kyiv, Ukraine , Daki, O.A. The Danube Faculty of Marine Transport of the State University of Infrastructure and Technologies, Izmail, Ukraine , Bohomia, V.I. Kyiv Institute of Marine Transport of the State University of Infrastructure and Technologies, Kyiv, Ukraine , Bukariev, A.O. Department of Aerospace Radio-Electronic Systems - National Aerospace University named after N. Ye. Zhukovsky “KhAI”, Kharkiv, Ukraine
Abstract :
The paper describes a concept of new type shipborne Doppler navigation system utilizing
microwave spectroscopy of the Earth’s atmosphere. It is a completely passive system that
measures emission spectra of gas radiothermal radiation surrounding a planet. Narrowband
spectrum of a gas molecule consists of sharply defined frequency lines that can be shifted be-
cause of relative motion of the observer. The physical properties of gases emission, principles
of microwave radiometry, typical instrument and observation modes are analyzed. The over-
all performance characteristics of microwave Doppler-spectro-radiometeric navigation system
and its accuracy are outlined. It is shown that such system can provide information on vector
of actual speed and play role in measuring present position, course and distance to destination.
Velocity measuring errors essentially depends on Doppler and pressure broadening of transi-
tional emission line of a gas and on spectrometer resolution. Known microwave spectroscopy
technique and well-studied gas lines can provide almost the same accuracy of navigation as
the Doppler speed log. But in contrast to popular methods of speed measurements current
research shows power-efficient, simple and totally covered thechnique of ship navigation that
can be further developed.
Keywords :
doppler navigation system , millimeter-wave radiometer , gases emission lines , passive measurements
