A REVIEW OF RADAR INTERFEROMETRY/IMAGING

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Jimmy Lau
Radio Observatorio de Jicamarca, Instituto Geofísico del Perú, Lima
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True
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Plane
Aperture
Plane
Visibility
Radio
Lens
Estimated
Brightness
Image
Plane
(from Woodman [1997])
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Table 1. Chronological development of radar interferometry techniques related to MST radars. The different
technique names adopted are marked in bold letters.
Reference
Description
Woodman [1971]
Pfister [1971]
First use of RI to determine the inclination of the magnetic field over Jicamarca.
First addition of phase measurements to a standard SA experiment. He noted that the
phase of the CSF was a linear function of the Doppler velocities, and estimated a velocity
that was in a good agreements with the apparent SA velocity.
Rüster and Woodman [1976]
Röttger and Vincent [1978]
Farley et al. [1981]
Röttger and Ierkic [1985]
First MST RI measurements at JRO. Inhomogeneities were not detected
Adams et al. [1986]
Kudeki [1988]
La Hoz et al. [1989]
Kudeki and Woodman [1990]
Röttger et al. [1990]
Liu et al. [1990]
Larsen and Röttger [1991];
Palmer et al. [1991]
Briggs and Vincent [1992];
Sheppard and Larsen [1992]
Doviak et al. [1996]
Chau and Balsley [1998a]
Show applicability of basic interferometry with MST radars.
Formal “appearance” of the RI technique, to study plasma turbulence in the Ionosphere.
Publish first MST RI studies measuring angle-of-arrivals (AOA) and introducing the
postbeam steering (PBS) technique.
Use imaging Doppler interferometry (IDI) to study the mesosphere with MF radar.
RI observations of mesospheric layers. Relates slope of phase angle spectrum to “horizontal” wind.
Use RI to investigate polar mesosphere summer echoes with an EISCAT VHF radar.
Introduce the Poststatistics steering technique (PSS).
Use the term spatial domain interferometry (SDI) or SI in order to discriminate from the
frequency domain interferometry (FDI) introduced by Kudeki and Stitt [1987]
Show analytically that there is equivalence between SA and SDI methods when
turbulence is neglected.
Use AOA information to get “corrected” vertical velocities.
Have shown that a full-spectral analysis (FSA) applied to SDI data is equivalent to the
well-known full correlation analysis (FCA) used with the standard SA method.
Present a theory that ties the properties of turbulently advected scattering medium to the cross
correlation and spectrum of signals in a general configuration of receivers and transmitter.
Complement Doviak et al. [1996]’s development by adding off-vertical AOA
contributions due to tilted layers, off vertical transmitting beams and geometrical effects.
3. References
References in text should be by name and year (Lau and Jameson, 1981.) List citations
alphabetically in the REFERENCES section using JGR format, i.e., Lau, J. L., and E.
Jameson, The radial evolution of a single solar wind parcel, J. Geophys. Res., 86, 4574-4580,
1981. Here is an example:
Later, radar interferometry was used by Roettger and Ierkic [1985] to study tilt angles, to
improve velocity estimates, and to track scattering patches, by using longer integration times
than those previously attempted. Since then, different techniques and theoretical works have
developed.
Bibliography
Röttger, J. and H. M. Ierkic, Postset beam steering and interferomet applications of VHF
radars to study winds, waves, and turbulence in the lower and middle atmosphere, Radio Sci.,
20, 1461-1480, 1985.
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