Abstract
High resolution millimeter-wave (MMW) imaging can be achieved on drone and unmanned aerial vehicle (UAV) platforms utilizing a breakthrough concept of high frequency, wide bandwidth RADARs in conjunction with precision position tracking of the platform vs. time. Standard imaging techniques scan a RADAR over an area and focused the received waveforms using Fast Fourier Transforms (FFTs) or correlation techniques, however all these focusing techniques rely on accurate phase information to create a high resolution image. Any motion that is not in the ideal scan trajectory of the radar on the platform creates phase distortion in the RADAR data. This phase distortion greatly defocusses the image. However this new technique takes advantage of precision 3D position tracking technologies, (optical tracking, high resolution differential GPS + magnetometers, redundant multiple axis accelerometers etc...) to accurately record the position and rotation of the drone/UAV platform vs. time. The 3D position and rotation information of the drone/UAV platform is then synchronized in time with the received RADAR waveforms. The 3D position registration is then used to apply a phase/position shift to the received waveforms in post processing. After the motion of the RADAR has been registered a weighting function is applied to create uniform sampling of the RADAR waveforms over its scanned trajectory. The position corrected and weighted waveform samples are then focused using correlation techniques to create 2D and 3D high resolution SAR images for short range applications.
Application Number
16/837,763
Inventors
Sheen,David M
Tedeschi,Jonathan R
McMakin,Douglas L
Gavric,Gordan
Hall,Thomas E
Market Sector
Sensors