Communications: directive radio wave systems and devices (e.g. – With particular circuit – Digital processing
Patent
1986-01-27
1989-06-06
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
With particular circuit
Digital processing
342 26, 342 91, 342205, G01S 734, G01S 1395
Patent
active
048375799
ABSTRACT:
A pulse marine radar system having a threshold generator providing a range dependent threshold waveform which is a function of sea conditions, rain conditions, and radar parameters. Based on the radar settings and inputs from the operator regarding the sea and rain conditions, a processor uses a mathematical model to compute the mean of sea clutter, rain clutter, and receiver noise for each of a plurality of successive range intervals. In response to the mean values, a generator generates a range dependent piecewise linear analog waveform which is subtracted in range sychronism from the receiver video. Next, the video is filtered. For each range interval, the processor also calculates a threshold based on the probability of sea clutter, rain clutter, and receiver noise exceeding the threshold after subtracting the mean. In response to the threshold values, a generator generates a piecewise analog signal which is compared with the output of the filter to digitize the radar video.
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Hall William M.
Pease William M.
Barron Jr. Gilberto
Clark William R.
Raytheon Company
Sharkansky Richard M.
Tarcza Thomas H.
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