Abstract: Electronically steered radar systems such as frequency scanning radars are particularly suitable for detecting and monitoring slow moving, ground-based targets. So-called crawler radar systems are intended for detection of targets that deliberately attempt to avoid detection by keeping low and by moving slowly. Disclosed is a radar system which includes an electronically steered antenna and a receiver arranged to process signals received from a target located at a distance from the radar system so as to identify a Doppler frequency associated with the target. The antenna stares at, rather than glides past, the target surrounding clutter. This means that the spectral spreading of static ground clutter associated with mechanical radar systems can be eliminated, overcoming one of the shortcomings of mechanical radar systems that would otherwise render a crawler radar system unsuitable for Doppler processing.

Abstract: Electronically steered radar systems such as frequency scanning radars are particularly suitable for detecting and monitoring slow moving, ground-based targets. So-called crawler radar systems are intended for detection of targets that deliberately attempt to avoid detection by keeping low and by moving slowly. Disclosed is a radar system which includes an electronically steered antenna and a receiver arranged to process signals received from a target located at a distance from the radar system so as to identify a Doppler frequency associated with the target. The antenna stares at, rather than glides past, the target surrounding clutter. This means that the spectral spreading of static ground clutter associated with mechanical radar systems can be eliminated, overcoming one of the shortcomings of mechanical radar systems that would otherwise render a crawler radar system unsuitable for Doppler processing.

Abstract: The barbless fishing hook has a shank having a longitudinal axis and a spike at one end, and extending longitudinally along the shank adjacent to the spike, a radially expanded surface extending radially outwardly of the longitudinal axis so as to define, in a first plane perpendicular to the longitudinal axis, a smoothly rounded generally radial arc devoid of stress concentration causing corners or elongate protrusions and so as to define, in a second plane containing the longitudinal axis, along the intersection of the second plane with the radially expanded surface, a line of intersection smoothly blending the radially expanded surface with the spike at one end of the line of intersection and with the shank at an opposed end of the line of intersection and the distance between the line of intersection and the longitudinal axis, perpendicular to the longitudinal axis, increasing smoothly along the shank from the spike to a maximum radial distance where the smoothly rounded generally radial arc sweeps out a