Phase-comparison monopulse

About: Phase-comparison monopulse is a research topic. Over the lifetime, 41 publications have been published within this topic receiving 211 citations.

Concurrent Respiration Monitoring of Multiple Subjects by Phase-Comparison Monopulse Radar Using Independent Component Analysis (ICA) With JADE Algorithm and Direction of Arrival (DOA)

Abstract: While non-contact monitoring of human respiration has been demonstrated using Doppler radar, the concurrent monitoring of multiple equidistant subjects remains a significant technological challenge. Reported research has so far been limited to maintaining 1-m subject separation, based on the radar antenna beam-width. Proposed here is a hybrid method consisting of an SNR-based intelligent decision algorithm which integrates two different approaches to isolate respiratory signatures of two subjects within the radar beam-width separated by less than 1 meter. Using Independent Component Analysis with the JADE algorithm (ICA-JADE) and Direction of Arrival (DOA), this SNR-based decision algorithm works with an accuracy above 93%. In addition, angular location of each subject is estimated by phase-comparison monopulse and an integrated beam switching capability is demonstrated to optimally extract respiratory information. The proposed method coherently combines two separation methods to overcome multiple-subject monitoring limits which can lead to practical adoption for many respiration monitoring applications.

Closed-form four-channel monopulse two-target resolution

Abstract: A novel closed-form solution to resolve the directions of arrival (azimuth and elevation) of two sources using a single snapshot (monopulse) of four independent channels is presented. Both phase comparison monopulse and amplitude comparison monopulse are solved. Exceptions where the two targets cannot be resolved are also discussed. Numerical simulation result of a practical phased-array configuration validates the effectiveness of the new solution.

Phase-comparison monopulse radar with switched transmit beams for automotive application

Abstract: We have developed a millimeter-wave automotive radar with /spl plusmn/10-degree azimuthal field of view for an adaptive cruise control. A novel technique has been introduced for realizing the wide field of view. That is a phase-comparison monopulse technique with switched transmit beams. This technique makes it possible to widen the field of view with a simple structure.

Multiple Subject Respiratory Pattern Recognition and Estimation of Direction of Arrival using Phase-Comparison Monopulse Radar

Abstract: A scalable non-contact respiratory monitoring approach is introduced for the practical separation and recognition of multiple simultaneous human respiratory patterns, using a 24-GHz phase-comparison Monopulse radar. The proposed system demonstrates a computationally efficient phase-comparison Monopulse technique to estimate the direction of arrival (DOA) of respiratory motion signals from single and multiple subjects to determine their angular positions. Experimental results demonstrated that Monopulse radar can sense and detect three different breathing patterns (normal, fast and slow) and can estimate the angular location of a single normally breathing subject within the main beamwidth of the transceiver with an estimation accuracy of approximately 84% whereas, and almost 78% for two subjects. Based on analysis of experimental results, the estimation accuracy of phase-comparison Monopulse technique degrades with the breathing pattern deviations from nominal breathing cycle and rate (fast/slow breathing) due to reduced phase measurement accuracy for the irregular signals resulting from lower signal to noise ratios (SNR). The proposed scalable 24-GHz radar transceiver system can successfully find the direction of the human target based on recognition of respiration signals which can have potential applications in healthcare and security surveillance systems.