24GHz Intruder Detection Radar with Beam-switched Area Coverage

Abstract

A 24GHz Intruder detection radar with three vertically-switched-beam antennas has been developed to cover a fan-shaped ground area with 90 degs. in azimuth and 0 to over 14m in range, when mounted at a height of 5m. Each switched beam monitors a different range segment with a monopulse scheme employed to achieve the wide azimuth coverage. An experimental radar with a Tx/Rx module fully assembled with MMIC's successfully detected a human intruder with a position accuracy of 50cm when moving at 1.4m/s.

Portable Microwave Radar Systems for Short-Range Localization and Life Tracking: A Review

“…Novel RF beamforming techniques are emerging for applications with higher frequencies. Researchers have designed complex delay lines and switch-antenna arrays to realize beam scanning for FMCW radar systems [ 57 , 58 , 68 ]. However, these methods usually have a limited number of steering angles.…”

Calibration of a full-disc longitudinal magnetogram at the Huairou Solar Observing Station

“…Bellot Rubio, Ruiz Cobo & Collados (2000) suggested that the strong velocity gradients, if they exist, would be responsible for the asymmetries and zero-crossing shifts of the Stokes V profiles in plage regions at the disc centre. With Hinode high-resolution measurements of pores and their surrounding regions, Morinaga et al (2007) interpreted the Stokes V area asymmetry as being a systematic inflow of plasma into the magnetic concentrations from their surroundings. These above results support the idea that the turbulent convection of fluid is coupled with the magnetic flux tube on a small scale.…”