Research on Direct Detection Method and Performance of Single-photon Counting Terahertz Radar
The conventional terahertz radar suffers from limited operation range for long-distance,noncooperative target detection due to the low transmitter power and atmospheric attenuation effect,both of which pose a hindrance in meeting the requirements of warning detection applications.To improve the radar detection capability,this paper studies an ultrasensitive target detection method based on single-photon detectors to replace traditional radar receivers.The method is expected to considerably expand the operation range of terahertz radars.First,the statistical law of the number of echo photons of a terahertz single-photon radar system is analyzed,and the echo characteristics of the target are expounded from a microscopic perspective.Furthermore,a terahertz single-photon target detection model,incorporating the characteristics of a quantum capacitor detector,is established.In addition,the mathematical expression of the target detection performance is derived,and the performance is evaluated via simulations.Further,a target detection performance curve is obtained.Finally,a time-resolved terahertz photon-counting mechanism experiment is performed,wherein we realize high-precision ranging by counting echo pulses.This work can provide support for the research and development of ultrasensitive target detection technologies and single-photon radar systems in the terahertz band.
Terahertz radarSing-photon radarSingle-photon countingDetection modelDead time
万方数据
维普
