Communications: directive radio wave systems and devices (e.g. – With particular circuit – Display
Patent
1983-11-09
1987-05-05
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
With particular circuit
Display
342195, G01S 712
Patent
active
046636307
ABSTRACT:
A PPI radar apparatus is constructed such that even when a transmission time cycle of radio waves is varied by switchover of a distance range to any of short, middle and long distance ranges, a sweep display time cycle of a radar video signal received in any of the distance ranges is maintained constant at all times; the sweep display time cycle is determined to meet the middle distance ranges, in the short distance ranges in which the reception time of radio waves is short, the video signals are written in storage means in real-time and then displayed by readout of the video signals at a low speed in synchronism with the sweep time cycle, in the long distance ranges in which the reception time of radio waves is long, the video signals are written in storage means in real-time and then displayed by a number of readouts in one sweep display time cycle; and the video signals written in a plurality of storage means are parallelly read out and a mean value or peak of the read-out video signals is obtained by arithmetic operation to thereby enhance the signal-to-noise ratio of the radar image.
REFERENCES:
patent: 4069481 (1978-01-01), Easy et al.
patent: 4206461 (1980-06-01), Pease et al.
Arima Kiyoshi
Kato Yoshio
Numaho Yoshio
Ogawa Tetsuro
Okada Hiroshi
Gregory Bernarr Earl
Tarcza Thomas H.
Tokyo Keiki Company Ltd.
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