Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1975-11-06
1978-05-16
Wilbur, Maynard R.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
325408, G01S 144
Patent
active
040902005
ABSTRACT:
A method for the comparative vector measurement of keyed radio signal pulses arriving nearly simultaneously at several radio receivers, particularly DME pulses, which can exhibit great level differences. The pulses at each receiver are individually fed to an amplifier or attenuator having an amplification or attenuation, respectively, which can be adjusted in distinct steps, whose reduction or increase, respectively, takes place automatically with the rise of the leading edge of the respective signal pulse. After passing through the respective amplifier or attenuator of the receivers, the instantaneous amplitudes of the measuring signals are measured at a specific measured time which is common to all receivers. In each receiver, an individual measuring time is ascertained in such a way that switching pulses derived from the step-wise amplification reduction of the amplifier (or the step-wise attenuation increase of the attenuator) are fed to a retriggerable monostable multivibrator having a specific holding time, during the operating sequence of which the individual measuring time of each receiver is provided. After this measuring time, or after the measuring time, to all receivers, an additional step-wise reduction in amplification or increase in attenuation at the respective receiver is blocked. An individual measuring time, selected with reference to the arrival sequence, is used as the common measuring time for the simultaneous measurement of the receiving vectors of all receivers.
REFERENCES:
patent: 3305787 (1967-02-01), Distler et al.
patent: 3361971 (1968-01-01), Eaves
patent: 3526849 (1970-09-01), Dishal et al.
patent: 3831095 (1974-08-01), Mounce
Leypold Dieter
Pieverling Klaus V.
Vachenauer Erwin
Blum T. M.
Siemens Aktiengesellschaft
Wilbur Maynard R.
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