Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1973-05-18
1976-02-03
Tubbesing, T. H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 77, G01S 946
Patent
active
039368246
ABSTRACT:
A digital display doppler radar unit has a moving mode and a stationary mode. The incoming doppler signal, which in the moving mode, represents both speed of the radar platform and speed of an approaching target vehicle, is separated into two signal components by selective filtering. One component represents the sum of the ground speeds for the radar platform and approaching vehicles. A time base is generated by a crystal control means and the time base is utilized for correlating the received doppler signals, indicative of speed, with the time base. Each doppler signal component is converted to binary coded decimal (BCD) information and a digital counter counts the cycles of each reeived doppler signal and compares the count with an amount previously stored. Circuit means are provided to validate the received doppler signal, allowing their continual processing only after a preselected number of valid comparisons are made. The radar signal component representing the ground speed sum for the radar platform and the approaching target vehicle, and the component representing radar platform speed are combined. The radar platform speed is subtracted from the combined component, resulting in a digital count representing approaching target vehicle speed. In the stationary mode, there is no radar platform doppler pulses in the radar return and consequently, the returning pulses may be processed directly and no subtracting function is performed. Speeds corresponding to the valid received doppler signals are suitably displayed to indicate a speeding violation.
REFERENCES:
patent: 3118139 (1964-01-01), Durstewitz
patent: 3241138 (1966-03-01), Zadig
patent: 3438031 (1969-04-01), Fathauer
patent: 3517998 (1970-06-01), Pryor
patent: 3689921 (1962-09-01), Berry
Aker John L.
Berry Fred M.
Geist Donald L.
Kittle Freddie R.
Kustom Electronics, Inc.
Montone G. E.
Tubbesing T. H.
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