The Bendix Corporation

Delmar V Payne

Ruy L Brandao

Jaromir R Bares

Eyung W Kang

A radar field of interest is divided into cells at a common range but at different angular spacings. The second derivative of the signal intensity of a radar return signal in each range cell is obtained by subtracting the signal intensity in the cell of interest from the signal intensity in the adjacent cell to obtain the first derivative and then subtracting the first derivative thus obtained from the subsequent first derivative. The second derivative is summed with subsequent second derivatives and further summed with the original return signal. The last sum is scaled, raised to an exponential value and again summed with the original return signal. The resultant signals from each range cell are reassembled to form a field of data corresponding to the radar field of interest.

Means for improving angular resolution of incoherent pulse radar systems

Information about air turbulence and wind shear can be obtained by analyzing the fluctuation of the envelope, at the detector output of a pulse radar, of backscatter from hydrometeors which trace the wind field. Further, under some conditions, radar returns can be identified as being backscatter from weather targets or from the ground or sea. The detector output signal is quantized into one of several class intervals whose boundaries, in mid-range, are in the same ratio. Consecutive radar returns from scatterers at the same nominal range and scan angle are quantized into either the same or different class intervals. The ratio of the number of consecutive quantizations that are different to the number of trials is a measure of the variance of relative velocities at that range and scan angle. This technique permits economical implementation of a plan position display of, for example, the expected severity of turbulence or wind shear at each increment of range and azimuth angle since duplication of circuits is not required.

Turbulence detector for non-coherent pulse radar

A signal system for use in a communication system for reducing intersymbol interference to increase the data rate per cycle of bandwidth, comprising a plurality of digital channel signal states each representing a channel symbol having a plurality of bits, the channel signal states being related in accordance with the simultaneous solution of a number of equations which are the first derivatives of mean squared channel error with respect to each signal state, each equation being set equal to zero and the equations being solved simultaneously to provide the related signal states.

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Ferndale, MI, United States of America

Delmar V Payne