Radar Recognition Research Articles

Synthetic aperture radar detection, recognition, and clutter rejection with new minimum noise and correlation energy filters

Synthetic aperture radar detection, recognition, and clutter rejection with new minimum noise and correlation energy filters

Enhanced target detection using stereoscopic imaging radar

An earlier correspondence reported experiments which suggested that the visibility of a target in clutter could be improved through stereoscopic viewing of high resolution radar images. Here we provide a more thorough discussion on the application of stereo for improving radar detection and recognition. Experiments are reported which confirm and extend the earlier reported results. An example of the use of stereo in a practical system is provided which demonstrates the potential for acquisition of high quality radar stereograms. >

Radar recognition of geometric classes in free space

Abstract A method for recognizing targets at any aspect angle is proposed using polarized, radar‐backscatter measurements. The measurements are taken at wavelengths commensurate with significant target‐body dimensions; i.e., near body resonance. The method applies to targets of arbitrary shape that cannot deform, such as missiles. The objects can be of arbitrary size and refractive index. The method is easily extended to the recognition of classes of objects that differ only by a scale factor in size. This is accomplished by scanning the radar frequency and making feature comparisons against stored libraries of features taken at several wavelengths. These torus‐like‐surface feature libraries are described by use of an n‐dimensional chain code, and a quantization interval for the classification space is specified according to the spatial frequency spectra of these toroids.

Neural network for radar terrain image recognition

Neural network for radar terrain image recognition

Development of secondary surveillance radar for air-traffic control

The considerations leading to the development of secondary surveillance radar (s.s.r.) for air-traffic control are listed. The evolution of s.s.r. is described from a simple responder capable of operation with primary radar to a complex system employing special frequencies and coding facilities on the ground-to-air and air-to-ground channels. The evaluation at London Airport of a relatively simple independent s.s.r. system in 1954 and 1956 and subsequent international discussions on the subject led to standardisation of system characteristics in 1957 by the International Civil Aviation Organisation (ICAO). Development of a British system designed to satisfy all the ICAO requirements was finished at the end of 1960 and was evaluated at London Airport during 1961. It was concluded that this system could reliably form the basis of an air-traffic-control radar recognition system. An experimental height-transmission equipment employing the air-to-ground coding system is described, and requirements for future system development are outlined.