Document Details Document Type : Article In Journal  Document Title : Construction and Demonstration of a Coherent Doppler Radar Construction and Demonstration of a Coherent Doppler Radar   Subject : physics  Document Language : English  Abstract : This article reports work on constructing a coherent Doppler radar using optical heterodyne detection principle to detect weak signals. Various independent factors and conditions of operation influencing this system were inspected. These factors are: A: local oscillator power, that demonstrated considerable influence on the beating frequency ability rising. It is established that its amount should essentially be few times bigger than the reflected signal from the moving object. B: atmospherical attenuation, this effect shows to have significant effectiveness on the laser power especially the humidity effectiveness on CO2 laser radiation. C: the reflectivity of some tactical objects that display considerable absorption to the laser radiation. D: the signal to noise ratio that facilitated concluding judgments concerning the differentiation between direct and indirect detection effectiveness. Moreover, computer guided optical radars for measuring object velocities with both CO2 and laser diode were set up on laboratory measure employing a Mercury Cadmium Tellurium (MCT) and Silicon detectors respectively. Different moving objects at different velocities were studied. Doppler shifts, modulation frequencies and laser wavelengths were conveyed to a PC, which was capable of displaying moving object velocities  ISSN : 1555-130X  Journal Name : JOURNAL OF NANOELECTRONICS AND OPTOELECTRONICS  Volume : 10  Issue Number : 5  Publishing Year : 1435 AH 2015 AD  Article Type : Article  Added Date : Saturday, August 19, 2017  Researchers Researcher Name (Arabic) Researcher Name (English) Researcher Type Dr Grade Email Y Al-Hadeethi Al-Hadeethi, Y Investigator Doctorate   Files File Name Type Description  42680.pdf pdf   Back To Researches Page