Fine human motion detection in contact-less manner based on radar technology is increasingly appealing research efforts among researchers and one of the promising approach that have garnered research momentum in recent years is IR-UWB radar. IR-UWB radar is a kind of radar sensor that was developed from combining UWB and radar technology. Being a technology that offers unique capability of penetrability, high temporal resolution, low power consumption and emits non-ionizing electromagnetic waves, IR-UWB radar sensor is an encouraging fusion of radar and UWB technology that can be leveraged into many useful extensive number of application. In this paper, a preliminary study of detecting fine human motion using IR-UWB radar sensor is presented where a system model based on the IR-UWB radar sensor operation on fine human motion detection is described. For testing, this work employs a right hand and fingers. Based on the tests, the movement of right hand and fingers can be discriminated accurately at a distance of between 5cm to 10cm with minor occurrence of noises.
Anechoic chambers are widely used in performing EMC measurements according to the established EMC standards. As in space area, EMC measurement is critically important to ascertain all of electrical and electronic components in the satellite body will function correctly without fail during launching and operation mode. Recognizing the needs and importance of performing the EMC measurements, the shielding performance of the chamber should be prioritized to ensure the interference of electromagnetic wave from outside going to inside the constructed chamber does not exist. As to maintain the shielding element, periodic checking and inspection should be well planned by conducting a specific test. This paper outlines a series of procedures that are developed while running the test. The test will characterize the shielding performance at four (4) frequency ranges using different types of antenna set. Typical test results are gathered and presented at the measured frequencies. Based on the results, it is concluded that the shielding performance of anechoic chamber is standing in good condition at three (3) ranges of frequencies except for frequency of 10 kHz to 200MHz. Several steps are recommended to remove or eliminate the random noise.
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