Rca Inc.

USA As Represented by Secretary of the Navy

Richard Prather Perry

Harry Urkowitz

Leonard Weinberg

Conventionally, a shift register receives radar video return signals and es them into a signal processing and detecting means. Since continuous, large cross-section echoes such as those derived from land masses may saturate the processor, the present apparatus is set to blank such land masses. For this purpose, the shift register capacity is made coextensive with the continuous land mass echo and further, the register is provided with a series of taps spaced one from the other a distance representing selected increments of the range extent being tested. Each tap output is applied to an amplitude-thresholder to pass only higher strength echoes to a counter. Count-responsive means operating as a counter threshold control the radar signal processor to the extent that when the total count exceeds a certain number a processor 'shut-off' signal is generated. When the count goes below the certain number a 'turn-on' signal is generated. Thus, the processor is inactive when the count receives a predetermined total indicator of the large land mass to be blanked.

Land mass blanking apparatus (U)

P-point transform analyzer using M N-point serial transform devices in parallel, the output signals therefrom being combined in K J-point serial transform devices in parallel, where M, N, K, and J are integers other than one such that M.times.N=K.times.J=P. Serial input signals are converted to M parallel sets of signals which are coupled to the N-point transform devices for processing in subgroups. The subgroups of output signals are combined into the proper order by switching the output signals from the N-point devices to the J-point devices after suitable delays and phase shifting.

Parallel transfer analyzer for performing the chirp Z transform

CFAR systems may become ineffective when extraneous targets present in thhold control cells raise the threshold detection level to such a point that the target in the cell being tested becomes obscured. The present circuitry locates the particular threshold control cell or cells having the extraneous target and eliminates it from the threshold detection level computation.

Constant false alarm rate (CFAR) circuitry for minimizing extraneous

Shift register data reordering system for reordering serial input data to an output data sequence according to a desired schema, using varying length registers with selective gating.

Data processor reorder shift register memory

Uncompressed linear frequency modulated signals from a radar or other type system are compressed in time by a digital matched filter employing a step transform process.

Digital matched filtering using a step transform process

A digital processor for discretely sampled information signals, of the type such as radar return signals and communication signals. Means are disclosed for determining the positions and values of extrema and the positions of the leading and trailing edges of extended pulses occurring between sampling instants. Means are also disclosed for determining the duration of such extended pulses.

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Haddon Heights, NJ, United States of America

Richard Prather Perry