Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1974-05-31
1976-06-08
Hubler, Malcolm F.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
G01S 942
Patent
active
039627047
ABSTRACT:
An improved MTI (Moving Target Indicator) cancelling system that provides cancellation in the first canceller stage of clutter at a first frequency and cancellation in a second or subsequent canceller stage of clutter such as weather or chaff with a substantial doppler frequency offset from that cancelled in the first MTI canceller. The first canceller stage may be a conventional in-phase (I) and in-quadrature (Q) digital MTI unit to develop the I and Q first differences followed by a conversion of these differences into a combined first difference designated as a quantity M and representing an angle times an amplitude multiplier. This M signal is then applied to a second canceller to develop a second difference signal which is then normalized to represent a pure angle term. A computer then determines the average angular error percentage over a selected number of adjacent range bins at each range bin interval and this percent error is then multiplied by the time aligned value of M to provide an actual error and a modified value of M is developed by subtracting the actual error from the value of M. The modified first difference signal is then subtracted from the delayed first difference signal to generate a second difference output signal with the undesired clutter at different doppler frequencies being cancelled.
REFERENCES:
patent: 3042915 (1962-07-01), Nordell
patent: 3706989 (1972-12-01), Taylor, Jr.
patent: 3755813 (1973-08-01), Evans et al.
Adam Walter J.
Hubler Malcolm F.
Hughes Aircraft Company
MacAllister W. H.
LandOfFree
Moving target indicator clutter tracker does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Moving target indicator clutter tracker, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Moving target indicator clutter tracker will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1103576