Knock and announce missions occur frequently on the urban battlefield. It would be advantageous to locate all of the humans inside an urban structure and obtain a "head count" prior to action. For this reason, we developed a through-wall radar sensor capable of locating moving targets through concrete-walled structures and of displaying the results (in range versus cross range) at a video frame...

Radar data collected from airplanes in real time is generally sparse except in very special cases. We demonstrate several tools and approaches to form images in some examples.

The frequency diverse multiple-input-multiple-output (FD-MIMO) radar synthesizes a wideband waveform by transmitting and receiving multiple frequency signals simultaneously. For FD-MIMO radar imaging, conventional imaging methods based on Matched Filter (MF) cannot enjoy good imaging performance owing to the few and incomplete wavenumber-domain coverage. Higher resolution and better imaging per...

Radar imaging and x-ray computed tomography (CT) are both based on inverting the Radon transform. Yet radar imaging can make images from as little as two degrees of aperture while x-ray CT typically requires an aperture of at least 120◦. Our discussion addresses this phenomenon. (Some figures in this article are in colour only in the electronic version)

Recent developments of wave polarization effects in radar remote sensing are summarized in historical sequence resulting in Radar Polarimetry, Radar Interferometry and Polarimetric SAR Interferometry, which represent the current culmination in airborne and space borne ‘Microwave Remote Sensing’ technology. Whereas with radar polarimetry the textural fine-structure, target orientation, symmetrie...

Atmospheric radar imaging techniques have shown promise in revealing the fine-scale structure of the atmosphere within the resolution volume of the radar. Enhanced resolution can be obtained in both angle and range by using spaced receivers and shifted frequencies, respectively. The distinct techniques have been termed coherent radar imaging (CRI) for angular resolution enhancement and range im...

Abs,stract-A new approach to high-resolution radar imaging is presented. The starting point is a model of the radar echo signal based on the physics governing radar reflections. This model has been used several times in the past for describing radar targets that are rough compared to the wavelength of the transmitted radiation. Without specifying precisely what the transmitted signal is, a gene...

Recently DLR has developed and constructed a new experimental radar instrument for various applications like radar signature collection, SAR/ISAR imaging, motion detection, tracking, etc., where high performance and high flexibility have been the key drivers for system design. Consequently a multipurpose and multi-channel radar called GigaRad is operated in X band and allows an overall bandwidt...