In:
The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 90, No. 4_Supplement ( 1991-10-01), p. 2348-2348
Abstract:
The most remarkable feature of the HIFE receptions is their phase stability in both time and frequency. Examples include (1) tracking of the peak-energy bin of FFT’s, (2) refinement of the carrier estimate to a precision adequate to estimate the transmission launch angle, and the small residual phase deviation track over a full hour, (3) the small phase swing of the integrated autocorrelation phase (IAP1) over one full hour, (4) the phase stability of arrivals, after removal of the broadband phase deviations measured by IAP1, and (5) comparison of the measured distributions of amplitude and phase of the individual frequency lines and individual time arrivals. The implications for phase coherent signal processing, in particular for more frequent transmissions in fixed–fixed tomography and for Doppler utilization in moving source tomography, will be discussed. Last but not least, the utilization of the arrival phase along the several sheets of propagating timefronts by passive broadband channel matching will be discussed.
Type of Medium:
Online Resource
ISSN:
0001-4966
,
1520-8524
Language:
English
Publisher:
Acoustical Society of America (ASA)
Publication Date:
1991
detail.hit.zdb_id:
1461063-2
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