Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1979-01-18
1980-09-09
Wilbur, Maynard R.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
455303, G01S 306
Patent
active
042220513
ABSTRACT:
The invention is a configuration of digital open-loop cancelers, each of ch uses a batch window sampling technique, for decorrelating a main input signal from a plurality of auxiliary input signals by using one or more iterations of cancellation. The main signal includes a desirable signal and undesirable interference signals. The auxiliary signals include the undesirable interference signals which are correlated with the interference of the main signal. Samples of the main signal and a first auxiliary signal are fed to a first digital canceler. The canceler batches them, (forms the samples in a group) and measures the correlation between the main signal and auxiliary signal. This measurement, or weight, is applied to each of the samples of the auxiliary signal which were used to establish the weight. The weighted auxiliary samples are subtracted from the main input signal to produce an output residue signal that is uncorrelated with the auxiliary signal. The residue signal is fed to a second canceler which operates in the same manner as the first canceler. A second auxiliary signal is also fed to the second canceler but is delayed by the processing time of the first canceler. The process is sequentially repeated until all the auxiliary signals have been sampled, the total of the repeated processes being an iteration. Further interference may be eliminated from the main signal by subsequent iterations which are performed by using other sets of cancelers that are connected in series with the prior set.
REFERENCES:
patent: 3938153 (1976-02-01), Lewis et al.
patent: 4086592 (1978-04-01), Lewis et al.
Kretschmer, Jr. Frank F.
Lewis Bernard L.
Berger Richard E.
Ranucci Vincent J.
Schneider Philip
Sciascia R. S.
The United States of America as represented by the Secretary of
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