Observation of coherent precursors in pulsed mode-stirred reverberation fields.
We report on measured statistics of pulsed radio-frequency fields inside a dynamic (mode-stirred) reverberant cavity. Unlike for time-harmonic excitation, the early transient received power during the buildup of energy is quasiperiodic with respect to the stir angle and exhibits unusually long correlations. These correlations decay at the same exponential rate as the increase of energy. By contrast, the probability distribution of the power reaches its asymptotic form in a more rapid but oscillatory manner.
Arnaut
L R
LR
Division of Enabling Metrology, National Physical Laboratory, Teddington TW11 0LW, United Kingdom.
Knight
D A
DA