Reflectivity Displacement Method Research Articles

A new MTI-SAR approach using the reflectivity displacement method

A new method for moving target detection, localization, and velocity estimation using SAR raw data is presented which allows the determination of the target's complete velocity vector. The method is applicable if the target has either a tangential velocity (/spl mu//sub T//spl ne/0) or a radial acceleration (/spl nu//spl dot//sub R//spl ne/0), or both. It is based on the analysis of the Doppler rate map which is obtained from the range compressed raw data, applying the reflectivity displacement method (RDM). The tangential velocity of each moving target is obtained from its own Doppler rate and the radial velocity from its own linear range migration. A velocity accuracy better than 3 m/s can be achieved for the airborne case. The method is validated experimentally by the use of real SAR data obtained by DLR's E-SAR. The paper gives a short description of the state of the art of moving target velocity measurements, introduces the RDM for stationary targets and its extension to the application for moving targets. It furthermore shows experimental results. >

Motion error determination from the signum-coded SAR raw data

The authors explore the determination of motion errors of an aircraft platform from the signum-coded synthetic-aperture-radar raw signal (SC-SAR data). The SC-SAR has a one-bit representation. In fact it only provides information about the sign of SAR recorded data. Displacement from the line-of-sight (LOS) direction and nominal forward velocity of SAR platform are estimated from this signal by using the reflectivity displacement method (RDM), which allows motion error determination directly from SAR raw data. The theory of the motion error estimation from the signum-coded raw data is presented and supported by experimental results. Comparison is made between the motion parameters computed by the original and the SC-data in order to show that the motion errors can be also determined by applying the RDM to the SC-signal.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

The residual error of the reflectivity displacement method of SAR motion extraction

Reported herein is the estimation of the residual error of the reflectivity displacement method (RDM) and the dependence of RDM on terrain characteristics. The RDM is a method to be implemented on airborne synthetic aperture radars (SAR). It extracts the motion of the aircraft from the radar backscatter signal, allowing for motion compensation without using an inertial navigation system. An extended error analysis of this method and its dependence on the terrain type and contrast is performed. Results proving the estimated performance are shown.