Moving target indication

About: Moving target indication is a research topic. Over the lifetime, 2653 publications have been published within this topic receiving 32435 citations.

Technique for cancellation of elevated clutter for the detection of fixed and ground moving targets under trees

Abstract: A target is detected under a forest canopy or other elevated clutter where the target is obscured by the elevated clutter. Radar returns reflected from the target on the surface, combined with those from the elevated clutter are digitized. Motion compensation is performed for the radar returns with respect to the target to obtain a focused first synthetic aperture image of the target. Next, the radar returns are motion compensated with respect to the elevated clutter at various heights above the surface to obtain images of the elevated clutter. The elevated clutter within the images at the various heights above the surface is identified and coherently subtracted from the original synthetic aperture images.

MTI system and method

Abstract: An airborne early warning moving target indicator radar in which targets in the main beam having reflective characteristics sufficient to override side lobe attenuation are tracked relative to the side lobes and the residual doppler frequency for such targets resulting from side lobe detection calculated. Based on this calculation, the appropriate ones of a bank of doppler filters are inhibited at the appropriate range bin to prevent a false target indication without inhibiting the display of moving targets in the main beam at the same range but having different doppler frequencies. In addition to side lobe blanking, an automatic gain control circuit is provided in which the interpulse period is divided into a large number of equal time intervals on the order of 0.4 microseconds each to thereby separate the return signal from each radar pulse into a large number of range bins. The gain of a wide band return signal amplifier is separately adjusted for each range bin on the basis of the sampled amplitude of the return signal from the preceding radar pulse in the corresponding range bin to thereby provide optimum gain without saturating the return signal processor. A novel amplifier and method of digitally controlling the gain thereof is disclosed as is the superimposition of the gain adjustment transients of each stage of the amplifier.

Large along-track baseline SAR-GMTI: First results with the TerraSAR-X/TanDEM-X satellite constellation

Abstract: In the paper first ground moving target indication (GMTI) and parameter estimation results obtained with the spaceborne TerraSAR-X/TanDEM-X satellite constellation are presented and discussed. For processing a dual-platform GMTI algorithm developed by the authors was used. This algorithm enables the estimation of the true geographical positions, the velocities and the headings of the detected targets with high accuracy. The algorithm is verified and evaluated using ground truth reference data.

Metrics for SAR-GMTI based on eigen-decomposition of the sample covariance matrix

Abstract: This paper investigates different metrics for indication of ground moving targets in multi-channel SAR data (SAR-GMTI). These metrics have in common that they are all based on the eigen-decomposition of the sample covariance matrix. Their statistical properties are analytically compared and their detection capabilities, demonstrated on measured two-channel airborne data.