G - Physics – 01 – S
Patent
G - Physics
01
S
343/54, 343/57
G01S 7/04 (2006.01) G01S 7/22 (2006.01)
Patent
CA 1115815
TITLE APPARATUS FOR DISPLAYING VHF-DIRECTION FINDER DATA ON A RADAR PPI INVENTORS James C. Rennie Philip M. Thompson Vernon I. Davies ABSTRACT OF THE DISCLOSURE The apparatus generates a train of pulse signals in real time which are fed to a Plan Position Indicator radar display video bright-up circuit. A line is formed on the display at a bearing ?, the direction of a VHF/DF fix, and passes through a point having the coordinates R0, .angle. ?, the position of the VHF/DF receiver, with respect to the center of the plan position indicator rotating radial scan. The radial scan operates at a radar trigger pulse repetition frequency F and rotates at a frequency f to subtend an angle ~ 9 - 360° x f per scan. The apparatus includes an up-counter for storing a count of ROsin (? - ?), and a down-counter coupled to the up-counter and enabled at the pulse repetition frequency F to receive the count from the up-counter. The down-counter is adapted to provide an output pulse signal to the video bright-up circuit when its count reaches 0. A binary rate arithmetic multiplier has a first input which receives clock pulses at a frequency fc >> F and a second input which receives a digital binary signal that is a function of the radar pointing angle .theta. of the radial scan. The multiplier thereby provides a series of timed output pulses to the down-counter such that the down-counter counts down to 0 and triggers the video bright up circuit.
336703
Davies Vernon I.
Rennie James C.
Thompson Philip M.
Canadian Patents And Development Limited
Her Majesty In Right Of Canada As Represented By The Minister Of
Rymek Edward
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