Satellite communications and the environment of space. V 1.1 Swiss Space Summer Camp 2016 Images: NASA 1
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1 Satellite communications and the environment of space Swiss Space Summer Camp 2016 Images: NASA 1
2 Can you name these satellites?
3 Sputnik The first man made satellite Launched in 1957 by The USSR Mass 84kg, diameter 53cm The Hubble Space Telescope The International Space Station
4 Now there are hundreds of satellites in orbit around the Earth while others are exploring the solar system.
5 You need an earth station.. Source: Swiss Space Summer Camp 2016 google/flickr/goonhilly 5
6 Swiss Space Summer Camp 2016 Satellite basics for building a simple ground station
7 Satellite basics Ground segment Ground station Hardware Software Project Contents Swiss Space Summer Camp
8 Satellites GPS Navstar Erdfunkstelle Raisting Swiss Space Summer Camp
9 Range of applications for satellites Earth observation satellites meteorologic (weather) satellite spy satellite radar satellite Communication satellites for commercial purposes e. g. Inmarsat, Iridium, Thuraia mil-com satellites for experimental tasks: amateur radio satellites Television satellites Astra Eutelsat Astronomy satellites for scientific purposes Killer satellites to destroy hostile satellites Debris removal satellites Research satellites, e. g. for experiments in micro-gravity Space Platforms for scientific purposes Navigation satellites (GNSS) GPS (USA, seit 1995) Glonass (Russland, seit 1993) Galileo (EU, ab 2014) Swiss Space Summer Camp
10 Different trajectories of satellites Geostationary Earth Orbiter (GEO) distance from earth: km orbit directly above the Earth's equator transmitter and receiver antennas can be permanently targeted. Medium Earth Orbiter (MEO) rotating around the earth flying altitude between km and km. Low Earth Orbiter (LEO) rotating around the earth flying altitude between 700 km und km Swiss Space Summer Camp
11 Geostationary trajectories and footprint Swiss Space Summer Camp
12 Geostationary trajectories and footprintmit with three satellites Swiss Space Summer Camp
13 Calculation of satellite trajectories The three Kepler's laws of planetary motion describe the movement of satellites: The orbit of a planet is an ellipse with the host star at one of the two foci. A line segment joining a satellite and the host star sweeps out equal areas during equal intervals of time. The square of the orbital period of a satellite is proportional to the cube of the semi-major axis of its orbit. Swiss Space Summer Camp
14 Link Budget Signal power is critical. Satellites dispose of low power Distances between space segment and ground segment are very long. (e. g. mobile phone <-> satellite) Antennas are susceptible to failure The Signal-to-Noise Ratio (SNR) has to be big enough The calculation of the SNR of the complete round trip connection (uplink/downlink) is called Link Budget: Cassegrain Antenne Swiss Space Summer Camp
15 Link Budget, numerical example of a commercial satellite Swiss Space Summer Camp
16 Let's calculate a link Budget of "our" satellite AO-73 Swiss Space Summer Camp
17 "Ideal" Downlink Budget Downlink Budget Analysis, f = 437 MHz, data rate = 9600 bps Transmit Power P Tx Connector-, Cable- and Impedance-Loss (L con, L cab, L imp ) Antenna Gain G Tx (ideal Monopole) Friis Formula (R S = 1815 km, h Orbit = 550 km, δ = 10 ) Atmospheric & Ionospheric Losses (L atm, L ion ) [1] Antenna Gain G Rx Polarisation Loss (L pol ) Connector-, Cable- and Impedance-Loss (L con, L cab, L imp ) Power at Receiver P Rx Receiver Sensitivity (TS2000, S/N=16 db) [2] Link Margin +30 dbm -2.0 db +5.1 dbi db -0.2 db +24 dbi -3 db -5.0 db dbm dbm db Swiss Space Summer Camp
18 Missing items in an "ideal" link budget a) UHF monopole antenna on a 1U CubeSat is never ideal b) Dynamic and static antenna pointing errors (serious problem for high gain GS antennas) c) Signal fading due to multipath (Atmosphere, Ionosphere, Terrain Reflection and Diffraction) Swiss Space Summer Camp
19 Channel Coding necessary Even more error sources: Offset between electrical and mechanical antenna axis Thermal deformation and wind force disturbance Gravity deformation Gear backlash Atmospheric refraction Therefore Channel Coding: moderate channel quality (Pb approx. 10-4) Link is available for 2 times of 10 minutes per day Payload (PL) produces large volume of compressed data Signal fading due to scintillation, especially by low elevation angels Swiss Space Summer Camp
20 Glossary Zenith: Nadir: Apogee: Perigee: AOS TCA: LOS: point directly "above" a particular location point directly below a particular location point farthest away from the Earth point nearest to the earth Acquisition of Signal Time of Closest Approach Loss of Signal Azimuth: the angle of horizontal deviation (from north) source: AMSAT Elevation: the angle of vertical deviation (from horizon) UTC: Coordinated Universal Time Doppler: An increase (decrease) in the frequency waves as the source and observer move towards (away from) each other. Uplink/Downlink: transmission from earth to space and vice versa Swiss Space Summer Camp
21 System structure: SEGMENTS Space segment Ground segment, Ground Station Control segment User segment Swiss Space Summer Camp
22 Space-/Ground-/User Segment Swiss Space Summer Camp
23 We focus on the Ground Segment (GS) Build a simple omni-directional antenna Use a Software Defined Radio (SDR) Front-End Use a Software Defined Radio (SDR) and a SW telemetry decoder Source: Surrey Space Technology Limited (SSTL) Swiss Space Summer Camp
24 GS Park Source: Surrey Space Technology Limited (SSTL) Swiss Space Summer Camp
25 Awaiting next pass in Horw Swiss Space Summer Camp
26 Mission Swiss Space Summer Camp
27 Your project's radio receiver front-end Swiss Space Summer Camp
28 Inside your project's radio receiver front-end Converts a radio signal from the antenna to baseband, i. e. makes it processible (easy to handle) by software. Swiss Space Summer Camp
29 Inside your project's radio receiver front-end, much more detailed Swiss Space Summer Camp
30 Software Defined Radio (SDR) Software All signal processing is done in software. Source: GeraldYoungblood, AC5OG, K5SDR Swiss Space Summer Camp
31 this is how a SDR looks like Swiss Space Summer Camp
32 Satellite Tracking Software: example: ISS real time tracking Ground track. The orbit data is extracted from the following two-line orbital elements U 98067A Epoch (UTC): 31 August :39:08 Eccentricity: inclination: perigee height: 402 km apogee height: 406 km right ascension of ascending node: argument of perigee: revolutions per day: mean anomaly at epoch: orbit number at epoch: Swiss Space Summer Camp
33 Practical example: ISS real time tracking Ground track. The orbit data is extracted from the following two-line orbital elements U 98067A Epoch (UTC): 31 August :39:08 Time of snapshot of orbital Elements Eccentricity e: Shape of the ellipsis (e = 0 for a circle) Inclination i: Angle between planes of equator and ellipsis Perigee height: 402 km Distance from closest point to earth Apogee height: 406 km Distance from farthest point to earth Right Ascension of ascending node: Point, where the satellite crosses the equator from south to north. Defines together with inclination i the orbital plane Argument of perigee: Angle of the point closest to earth Revolutions per day: i. e minutes for one revolution Mean anomaly at epoch: Orbit number at epoch: 1677 Total number of revolutions up till now Drag Not appropriate (Why?) Swiss Space Summer Camp
34 Block diagram of a simple ground station Swiss Space Summer Camp
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