Title :
A helicopter-borne eight-channel ranging scatterometer for remote sensing. I. System description
Author :
Hallikainen, Martti ; Hyyppa, Juha ; Haapenen, J. ; Tares, Teemu ; Ahola, Pekka ; Pulliainen, Jouni ; Toikka, Martti
Author_Institution :
Helsinki Univ. of Technol., Espoo, Finland
fDate :
1/1/1993 12:00:00 AM
Abstract :
For pt.II see ibid., vol.31, no.1, p.170-9 (1993). HUTSCAT, a helicopter-borne dual-frequency FM-CW scatterometer, is described. The HUTSCAT measures the backscattering properties of a target with a range resolution of 65 cm. The real-time ranging capability is obtained by performing the fast Fourier transform (FFT) to the received time-domain signal. The measurement is made simultaneously at eight channels (VV, HH, HV, and VH modes of polarization at 5.4 GHz and 9.8 GHz). The scatterometer measures the radar return spectrum for eight channels in 16.6 ms, which corresponds to an along-track distance of 0.33 m for the helicopter speed of 20 m/s. The radar system has been designed for remote sensing of forests, sea ice, and snow
Keywords :
forestry; geophysical equipment; geophysical techniques; hydrological techniques; oceanographic techniques; remote sensing by radar; sea ice; snow; 5.4 GHz; 9.8 GHz; FFT; HUTSCAT; SHF; airborne; backscattering; dual-frequency FM-CW scatterometer; fast Fourier transform; forest; geophysics; helicopter-borne eight-channel ranging scatterometer; land surface; measurement; microwave; ocean; polarization; radar; real-time ranging capability; remote sensing; sea ice; snow; target; technique; vegetation; Backscatter; Fast Fourier transforms; Polarization; Radar measurements; Radar remote sensing; Radar scattering; Sea measurements; Signal resolution; Time domain analysis; Velocity measurement;
Journal_Title :
Geoscience and Remote Sensing, IEEE Transactions on
