Passive crosswind profiler
A passive optical crosswind profiling system. The system includes at least one telescope defining two apertures separated at a distance and adapted to collect light along at least two separate paths from a field of view containing a target and at least one high-speed digital camera defining at least one many pixel sensor wherein pixels of said at least one many pixel sensor are identified as separate blocks of pixels. The system further includes an optical system for focusing light collected along said at least two separate paths by said at least one telescope onto said at least one many pixel sensor to produce at least two images of the target scene and a high-speed computer processor programmed to with a special block matching correlation algorithm to correlate image data collected the separate blocks of pixels in order to calculate a crosswind profile along a path between said system and said target.
1. A passive optical crosswind profiling system comprising:
A) at least one telescope defining two apertures separated at a distance and adapted to collect light along at least two separate paths from a field of view containing a target,
B) at least one high-speed digital camera defining at least one many pixel sensor wherein pixels of said at least one many pixel sensor are identified as separate blocks of pixels,
C) an optical system for focusing light collected along said at least two separate paths by said at least one telescope onto said at least one many pixel sensor to produce at least two images of the target scene,
D) a high-speed computer processor programmed to with a special block matching correlation algorithm to correlate image data collected the separate blocks of pixels in order to determine time required for horizontal and/or vertical shifts of blocks of images caused by air turbulence producing spatially-varying tilts and/or phase gradients in images detected by at least two of the separate blocks of pixels across the apertures of the at least one telescope to calculate a crosswind profile at multiple locations along a path between said system and said target.
2. The system as in claim 1 wherein said blocks of pixels comprise about 20×20 pixels per block.
3. The system as in claim 1 wherein said at least one sensor comprises at least 512×512 million pixels to define at least 625 blocks of pixels.
4. The system as in claim 1 wherein said computer processor is adapted to determine a spatial-temporal correlation of the local horizontal and vertical shifts of the blocks of the images caused by air turbulence.
5. The system as in claim 4 wherein said processor is programmed to determine crosswind speeds along the path from shifts of peaks of cross-correlation information and directions of the shift where the ray trajectories of sets of two cross-paths intercept.