Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1974-06-03
1976-02-10
Tubbesing, T. H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 172R, G01S 960
Patent
active
039381455
ABSTRACT:
Reflectivity estimates from clouds and other clutter targets normally reqe an averaging of a large number of independent radar pulse samples. If the radar generates noise pulses of a predetermined bandwidth and pulse length, a large number of returns can be derived and, when averaged over the full length of the pulse, the returns provide the desired reflectivity estimate. Considering a noise source whose spectrum in the frequency domain can be represented by a rectangular function of width .beta. (bandwidth), the properties of this function are such that the time (.tau.) at which it first becomes zero is related to .beta. by .tau.=1/.beta.. Time .tau. is the correlation time. If the pulse length T is made relatively long compared to the correlation time, it becomes possible to average or integrate within the pulse length T since the number of uncorrelated noise configurations is T/.tau.=.beta.T. For a noise pulse of one microsecond long (T) and a bandwidth (.beta.) of 100 MHz, the number of independent noise configurations within the pulse is 100 .times. 10.sup.6 .times. 10.sup..sup.-6 = 100. Averaging the 100 samples of one pulse provides a reliable reflectivity estimate or mean intensity value for the clutter.
REFERENCES:
patent: 3114148 (1963-12-01), Lederman
patent: 3149332 (1964-09-01), Kocher
patent: 3175214 (1965-03-01), Ramsay et al.
patent: 3603919 (1971-09-01), Moore
Brook Marx
Krehbeil Paul R.
Critchlow Paul N.
Sciascia Richard S.
The United States of America as represented by the Secretary of
Tubbesing T. H.
LandOfFree
Fast-scanning broad band radar system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fast-scanning broad band radar system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fast-scanning broad band radar system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-154435