Very high bandwidth millimetre-wave radar

Abstract

An experimental radar at 94 GHz has been developed, which is capable of delivering an instantaneous bandwidth of 4 GHz. The radar uses an FM-CW waveform and is fully solid state. The data undergo an ISAR imaging process to derive high resolution scattering centre distributions for targets measured in tower/turnlable configuration. The high resolution processing has to rely on an appropriate polar reformatting procedure, which is not necessary for ISAR imaging at millimetre waves with resolutions worse than 10 cm

Instrumental CWLFM High-Range Resolution Radar in Millimeter Waveband for ISAR Imaging

“…However stepped frequency waveforms, pulsed trains with frequency hopping, are very common in published systems whose goal is to achieve a very good range resolution without needing high sampling frequencies [25], [26]. A priori, it is possible to achieve all objectives of the project using intrapulse modulation [25], but unfortunately, for HRR, a large number of pulses would be needed, resulting in a low unambiguous Doppler range, not big enough for good ISAR images [27].…”

Millimeterwave radar network for foreign object detection

“…The system concept is based on a design, which was already realized at 94 GHz [1]. The radar FM-CW front-end uses miniaturized, monolithically integrated components in GaAs technique [2].…”

PM noise measurement at W-band

“…The migration to W-band frequencies (75 GHz -110 GHz) is central to the advancement of many applications, particularly satellite communications [2], radar for targeting and tracking purposes [3], imaging [4][5], and vibrometry for concealed weapons/explosive detection [6]. The success of these applications depends critically on the ability to reduce the phase-noise of the reference oscillator and other electronics at W-band.…”