Abstract: An improved system and technique for reducing interference in signal receng systems, particularly in sidelobe canceller systems. Adaptive canceller loops receive inputs from an auxiliary channel signal and operate on a main channel signal to reduce interference in the main channel signal. The auxiliary channel signal is supplied through a quadrature hybrid circuit to provide I and Q components to the adaptive loops, which loops are connected in series and cascaded such as to form a plurality of serially connected I and Q loops.

Abstract: A technique for detecting and eliminating "sea-spike" interference in a rrn radar-signal. A series of signal delay means in cooperation with associated subtractors are utilized to detect particular sea-spike modulation interference frequencies. Detection of these modulation frequency components causes activation of means for preventing the sea-spike contaminated return signal from being further processed.

Abstract: Measurement of the range of a detected target is accomplished through utiation of a large bistatic-angle radar system having two transmitters used in conjunction with a receiver indicating the duration of received target forward-scattered signals from each transmitter.

Abstract: Rotation of a search radar antenna primary focusing structure about both elevation and optical axes provides stabilization of the radiated beam in both level and cross-level respectively.

Abstract: An improved technique for eliminating interference in a signal processing stem exposed to multiple interference sources. A main receiving channel output and a plurality of auxiliary channel outputs are connected to form a canceller system where outputs from the canceller of each auxiliary channel are connected in parallel and subtracted from the main channel signal. The output residue from the subtractor is then combined in a second subtractor with the input from a second group of parallel connected cancellers using the same auxiliary channels. Each group of parallel connected cancellers and subtractor forms an iteration which reduces the residue of interference in the main channel. By providing a series of iterations, the cancellation obtainable can be improved along with an increase in system stability.

Abstract: An improved side-lobe canceller system for reducing interference introduced nto a signal receiving system from multiple interference sources. A first canceller loop associated with an auxiliary channel operates independently to decorrelate its auxiliary signal and the output sample of a main channel signal from its own subtractor. Each of a remaining plurality of canceller loops, also associated with an auxiliary channel and operating independently, are serially connected to successively operate on the output of a previous canceller loop. When all auxiliary canceller loops have operated, a second series of the same canceller loops arranged to follow the first series, provides an additional iteration to the canceller system. By utilizing a plurality of serially arranged iterations to operate on the signals received by the plurality of auxiliary channels, the interference in the main channel may be significantly reduced.