Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1976-05-25
1977-08-09
Wilbur, Maynard R.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
340 27R, 343 7TA, G01S 922, G01C 500
Patent
active
040413411
ABSTRACT:
A pulsed doppler-radar system is utilized to determine if the terrain clearance of an aircraft drops below a predetermined aircraft safety clearance. The system includes a maximum-range doppler-frequency counter which counts the highest doppler frequency received for a maximum range and a range gate which receives and passes doppler frequencies from within a predetermined slant range. A reference-frequency generator generates a reference frequency related to the highest doppler frequency and cooperates with a frequency synthesizer to synthesize a frequency related to the computed doppler frequency for the aircraft safety clearance. The slant-range doppler frequencies are summed with the synthesizer frequency and a critical-frequency detector detects the sum frequency to determine if terrain clearance drops below the predetermined aircraft safety clearance.
REFERENCES:
patent: 3187328 (1965-06-01), Vetter
patent: 3553689 (1971-01-01), Bechtel
Berger Richard E.
Rasmussen David G.
Schneider Philip
Sciascia R. S.
Wilbur Maynard R.
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