Satellite Communication/Antenna 썸네일형 리스트형 Satellite Network Capacity/Throughput/etc. Throughput : Capacity : It is a measure of how much data can be transferred through satellite networks. Adding capacity is to ensure a high-quality user experience for the high data rate. It is measured in terms of theoretical raw data, for instance of 100 Gbps of total capacity, on any one given satellite. The numbers are typically theoretical and sometimes include bandwidth reserved for remote.. Low-profile Antennas (LPAs) Low Profile Antenna Low profile: It means small height and width. A Profile: It is a side view, often defined as 90 degrees from the front or back view. Low Profile Antenna is the antenna which can be mounted to buildings and cars(plane surface). Low-profile antenna often has high input impedance, and it also has small gain. Importance of antenna height is to avoid effect of ground reflected sig.. IMU IMU (Inertial Measurement Unit) This is a device that directly measures the three linear acceleration components & the three rotational rate component of a vehicle. It does not require any connection or knowledge of the external world. ("Independent" property of the IMU) RSSI and Kalman Filter RSSI(reference: https://www.wouterbulten.nl/blog/tech/kalman-filters-explained-removing-noise-from-rssi-signals/) RSSI (Received Signal Strength Indicator) is a kind of a power of received radio signal, which is measured in dBm. As you might expect, the higher the RSSI value, the higher the signal strength. Since we can describe RSSI with distance using a model, the Log-Distance pathloss model, .. Bandpass Filter (BPF) Band-pass Filter This is a device that passes frequencies within a certain range and rejects frequencies outside of that range. Filter circuits can be designed by combining the properties of low-pass and high-pass into a single filter. This is called a band-pass filter. (reference: https://www.allaboutcircuits.com/textbook/alternating-current/chpt-8/band-pass-filters/) Parameters(reference: http.. Satellite Beacons History The first artificial satellite, Sputnik-1, was launched into orbit in 1957 with carrying a radio beacon transmitting of 20,005 MHz. This was the first instance of telemetry (measurement from afar) from space. Satellite beacons have been used for many purposes, 1. tracking and telemetry2. propaganda advertisement to ground navigation and monitoring. Satellite beacons today generally trans.. FFT (Fast Fourier Transform) FFT (Fast Fourier Transform) This is an algorithm that samples a signal over a period of time or space, and it divides the signal into its frequency components. This components are single sinusoidal oscillations at distinct frequencies each with their own amplitude and phase. The image above has 3 distinct domain frequencies. Prev 1 Next