
By Lawrence A. Klein
This booklet illustrates the advantages of sensor fusion via contemplating the features of infrared, microwave, and millimeter-wave sensors, together with the effect of the ambience on their functionality. themes contain purposes of multiple-sensor structures; goal, heritage, and atmospheric signature-generation phenomena and modeling; and techniques of mixing multiple-sensor information in goal identification and tracking Read more...
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The agreement of the modeled data with measured values allows the prediction of atmospheric absorption in rain over large regions of the millimeter-wave spectrum and rainrate variation when measured values are lacking. 23 Because droplet diameters in fog are small compared with millimeter wavelengths, scattering loss is negligible when compared to absorption of millimeter-wave energy by a fog. 438M W 2 dB/km, where = one-way absorption coefficient, MW = mass of condensed water per unit volume of air in g/m3, and = sensor wavelength of operation in cm.
The model produces the largest errors in transmittance as compared to measured data when the relative humidity is between 90 and 95 percent, probably because the presence of fog is most in doubt in this region. 5 Fog Characterization Fogs found over land are of two types, advective fog (formed by cool air passing over a colder surface) typical of coastal regions, and radiative fog (formed by radiative cooling of the Earth’s surface below its dew point level) found in inland regions. , is comparable to the wavelength of the incident energy, the phase of the wave is not uniform over the particle.
10 Rain backscatter coefficient as a function of frequency and rain rate. 100 30 SENSOR AND DATA FUSION: A TOOL FOR INFORMATION ASSESSMENT AND DECISION MAKING radars. 37 through 70 GHz obtained with a radar that transmitted and received vertical polarization signals as indicated by the V-V polarization notation. 5- to 7-mm range. 5 mm. 5 mm. 5 mm. 21 According to Crane, measurements of raindrop size distributions contain large variations for the same location, rain type, and rain rate. 33 The theory for rain backscatter coefficient adequately models the measured values in the MMW spectrum.