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Let be the integer that labels a pulse emitted by
radar unit B. If that pulse gets reflected, or partially reflected,
by a scattering event, then let be the integer which the clock
assigns to the reflected pulse as it enters the radar receiver.
These two integers,
generated by this radar ranging process are the radar coordinates of
the scattering event. They assign a unique
spacetime location to the scattering event, namely as determined by
Here and are those two events at radar unit B
which mark the emission and the reception of a pulse at B.