Class 342/144 - PPI type

Subclass of Class 342 - Communications: directive radio wave systems and devices (e.g., radar, radio navigation)
Definition: Subject matter wherein the display represents the signal
No. of patents: 4
Last issue date: 10/03/1995

Number	Title	Issue Date
5455591	Precision high speed perspective transformation from range-azimuth format to elevation-azimuth format A high speed and high precision coordinate transformation process for transforming image data in range-azimuth coordinates to horizontal-vertical display coordinates. The process is comprised of the following steps. Recursion initialization parameters and...	10/03/1995
4596987	PPI display apparatus A PPI display apparatus allows a radar image or bearing marker to be displayed on a circular CRT screen through sweeping on the basis of a plan position indicator system. In the apparatus, the generation of a radar antenna angle signal, generation of a be...	06/24/1986
4281327	Range corrector circuit for a bistatic passive radar display The range corrector circuit uses two counters, one for the apparent range (Ra) and one for the correct range (Rc), and a random access memory (RAM). The Rc counter is continuously incremented linearly and the Ra...	07/28/1981
4023166	High power low loss nonresonant filter system A radar system using a resonant circuit pulsed generator such as a magnetron with a nonresonant filter using directional couplers to split the power output of the generator into two signal channels and to directionally recombine the channels after the cha...	05/10/1977

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