Engineering topics
Publications and source records attributed to Mott, H..
During the past decade, Radar Polarimetry has established itself as a mature science and advanced technology in high resolution POL-SAR imaging, image target characterization and selective image feature extraction.
This paper presents a technique for the partial-fraction expansion of functions which are ratios of polynomials with real coefficients. The expansion coefficients are determined by writing the polynomials as Taylor's series and obtaining the Laurent series expansion of the function. The general formula for the inverse Laplace transform is also derived.
Equations are derived for the general terms of the series obtained when certain operations are carried out on one or several given series. Explicit and recurrence relations are given for the literal groups which are common to the given series. A general method is shown to obtain the multipliers which depend on the operation being performed, and the method is illustrated for several examples.
A relationship exists between the elements of the transfer wave matrix and the ABCD matrix elements which allows a considerable reduction of effort required to find the matrix for cascaded two-port network sections. This relationship and the simplified expressions for obtaining the matrix elements are presented here.
The depolarization of a beam wave, with Gaussian intensity distribution and arbitrary divergence, propagating in a turbulent medium is considered. The correlation function of the depolarized component of the beam is determined. The mean-square depolarization fluctuation is then determined for a medium characterized by a Kolmogorov spectrum. If the beam is assumed to be collimated, this expression reduces to that of Collett and Alferness; if the plane-wave limiting case of the Gaussian beam is taken, the results in this paper agree with those of Strohbehn. The results show that off the beam axis the depolarization can be greater than for the plane wave, and that near the beam focal point the depolarization may decrease by orders of magnitude.
Scale modeling antenna systems for aircraft and missiles with anechoic chamber evaluation and use
Polarization-controllable antenna using digital control system
Second and third harmonics produced by p-i-n diode in microwave switching application
Location of radiation pattern disturbing structures in vicinity of satellite antenna
Source distribution determination from radiation pattern and field amplitudes expressed as Fourier transform pair
Measurement of harmonics produced by a pin diode in microwave switch
Locating pattern-disturbing structures in near- field of spacecraft antenna and estimating distortion contribution
Time-base encoder using sinusoidal reference voltage which does not produce undesirable switching transients resulting from abrupt variation
Mutual impedance effects in electronically-scanned antenna arrays
Versatile tunnel diode voltage amplitude comparator design and incorporation into three-bit encoder
Electronically scanned antenna array and beam scanning
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Power requirements for multifrequency breakdown in monopole antenna system