Abstract: A demodulation system extracts data from an input amplitude modulated signal electromagnetic wave with a signal multiplying means that has two input terminals both of which are coupled to receive the input amplitude modulated signal. An output terminal of the multiplying means provides an output signal which is the instantaneous square of the input amplitude modulated signal. A lowpass filter is coupled to the output terminal of the signal multiplying means to reject at least twice the carrier frequency 2(.omega..sub.c) and higher frequency components, and to pass the second harmonic and lower frequencies of the modulation signal 2(.omega..sub.m(max)) to provide a filtered signal that is representative of the square of the amplitude modulation of the input signal. This demodulation method approaches ideal square law detection with power measurement of the input amplitude modulated signal. The filtered signal is supplied to an analog-to-digital converter to supply a digital data output.

Abstract: A radar scan conversion from radar data in polar coordinates to radar data in rectangular coordinates is employed to supply (x,y) coordinate data to a display, which has variable azimuthal pixel resolution that increases from the center of the display to its periphery. An aggregate radial scan pattern is generated on the display that consists of a plurality of radials each of which have active lengths that span one or more of a plurality of selected boundary resolution zones of the display. These zones are defined by a series of different hyperbolically-based resolution boundaries which define resolution zones of increasing azimuthal resolution values as the zones extend further from the center of said display towards the periphery of said display. The number of radials that are generated on said display match the average azimuthal resolution of said display for each zone.