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This book presents a novel satellite timekeeping system which does
not require on-board atomic clocks as used by existing navigation
satellite systems such as GPS, GLONASS or the GALILEO system. This
concept is differentiated by the employment of a synchronization
framework combined with lightweight steerable on-board clocks which
act as transponders re-broadcasting the precise time remotely
provided by the time synchronization network located on the ground.
This allows the system to operate optimally when satellites are in
direct contact with the ground station, making it suitable for a
system like the Japanese Quasi-Zenith Satellite System, QZSS. Low
satellite mass and low satellite manufacturing and launch cost are
significant advantages of this novel system. Two possible
implementations of the time synchronization network for QZSS are
presented. Additionally, the problem of satellite communication
interruption is analysed and a solution is presented. Finally a
positioning and timing quality analysis, aimed to provide
understanding of the actual timing quality requirements for QZSS,
is presented.
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