Abstract: The present technology is directed to apparatuses, systems, and methods for improving the performance of non-contact vibrometers in the presence of platform motion and speckle noise. In addition, systems and methods are described that allow intentional frequency displacement of heterodyne and/or homodyne vibrometer returns to enable disambiguation of the sign of the vibration direction in the presence or absence of platform motion.

Abstract: A method and system to determine a match between a known and unknown signal is provided. The method and system first conditions an unknown signal by anti-aliasing and digitizing the unknown signal. The condition signal is then compared on a bit by bit basis to at least one known signal to determine a match. A threshold detector determines that the conditioned signal matches the at least one known signal when the number of bit matches exceeds a predetermined threshold.

Abstract: Methods, systems, and devices are provided that may facilitate multibeam coherent detection and/or speckle mitigation. For example, some embodiments provide for multiple simultaneous independent speckle realizations in light reflected from an actively illuminated target while also may simultaneously provide reference beams inherently aligned to each speckle. These tools and techniques may facilitate coherent detection of light returned from a target. In some cases, this may provide the basis for substantial speckle mitigation. With the addition of illumination phase or frequency modulation and/or intelligent algorithmic methods, some designs may utilize the multiple speckle returns to actively mitigate speckle noise, and can further be used to separately measure speckle phase to implement interferometric resolution surface tilt measurement and/or surface imaging. These tools and techniques may be utilized for other purposes related to multibeam coherent detection and/or speckle mitigation.