Abstract: A system comprising a moving radar, a processing device, and a phase difference determination device is used to monitor a target. The moving radar has first and second phase centers that transmit and receive signals normal to a direction of movement of the radar. The processing device receives first and second ones of the received signals from the first and second phase centers, respectively, and performs a target motion compensation and target acceleration correction for each of the first and second received signals to produce first and second images. The phase difference determination device determines a phase difference image from a comparison of the first and second images.

Abstract: Methods and systems for detecting and mitigating DRFM-based interference in SAR images are provided. Embodiments include methods and systems for detecting and removing DRFM-based interference from SAR images by exploiting multi-channel SAR data. Embodiments provide an Electronic Counter Counter Measure (ECCM) technique that is effective against, among others, SAR DRFM-based repeater jamming, false target images, noise jamming, and vector multiplier jamming for false scene generation. When used, embodiments of the present invention reduce jammer effectiveness to a small range strip (a strip parallel to the range dimension) in the direction of the jammer. In addition, jammer mitigation is performed without losing SAR image data at the affected SAR pixels. Furthermore, embodiments of are compatible with time variable ECCM techniques, including orthogonal waveforms or pulse jitter techniques, for example.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.