We describe the concept of Doppler asymmetric spatial heterodyne spectroscopy (DASH) and present a laboratory Doppler-shift measurement using an infrared laser line. DASH is a modification of spatial heterodyne spectroscopy optimized for high precision, high accuracy Doppler-shift measurements of atmospheric emission lines either from the ground or a satellite. We discuss DASH design considerat...

Thls paper explores the potential for airborne remote sensing for atmospheric sciences research. Passive and active techalques from the microwave to visible bands are discussed. It is concluded that technology has progressed sufficiently in several areas that the time Is right to develop and operate new remote sensing instruments for use by the community of atmospheric scientlste as general pur...

Differential geometric techniques are presented and used to model the optical properties of the atmosphere under conditions that produce superior mirages. Optical path length replaces the usual Euclidean metric as a distance-measuring function and is used to construct a surface on which the paths of light rays are geodesics. The geodesic equations are shown to be equivalent to the ray equation ...

The GF-3 satellite is the first multi-polarization synthetic aperture radar (SAR) imaging satellite in China, which operates in the C band with a resolution of 1 m. Although the SAR satellite system was geometrically calibrated during the in-orbit commissioning phase, there are still some system errors that affect its geometric positioning accuracy. In this study, these errors are classified in...

A spaceborne radar for atmospheric observation must be able to detect atmospheric backscatter in the presence of clutter due to antenna sidelobes. Here, we analyze the problem in detail, deriving a method for computing clutter which includes effects of all contributing transmit pulses, Doppler shifting, finite receiver bandwidth, and curved earth's surface. The results are applied to analysis o...

We present a 40 minute time series of filtergrams from the red and the blue wing of the Hα line in an active region near the solar disk center. From these filtergrams we construct both Dopplergrams and summed “line center” images. Several dynamic fibrils (DFs) are identified in the summed images. The data is used to simultaneously measure the proper motion and the Doppler signals in DFs. For ca...

Left ventricular (LV) hypertrophy is an important predictor of morbidity and mortality in hypertensive patients, and its geometric pattern is a useful determinant of severity and prognosis of heart disease. Studies on LV geometric pattern involving large number of Nigerian hypertensive patients are limited. We examined the LV geometric pattern in hypertensive patients seen in our echocardiograp...

The U.S. Department of Energy’s Atmospheric Radiation Measurement (ARM) Program operates several stationary and mobile aerosol and radiation measurement sites in climatologically significant regimes. At the ARM sites, millimeter wavelength profiling Doppler radars (operating at 35and 94-GHz) provide continuous high-resolution (2 sec, 45 m) 256-point FFT Doppler spectra observations of clouds an...

Observations of the winds in the upper atmosphere obtained with the High-Resolution Doppler Imager (HRDI) on the Upper Atmosphere Researck Sarellife (UARS) are discussed. This instrument is a very stable high-resolution triple-etalon Fabry-Perot interferometer. which is used to observe the slight Doppler shifts of absorption and emission lines in the O2 Atmospheric bands induced by atmospheric ...

In CDL, a laser pulse is transmitted into the atmosphere and the Doppler shifted signal that scatters off of atmospheric aerosol particles is detected by beating this signal with a local oscillator (LO) [1][2][3] . The resulting RF signal has a Doppler shift proportional to the speed of aerosol particles along the line of sight of the laser beam. In this paper, we present preliminary results fr...