Link analysis for BILSAT-1

2006-03-11
Telli, Ali
Es, Alphan
,BILSAT-1, a 130 kg micro satellite, is Turkey's,2 first Low Earth Orbit Earth (LEO) observation satellite(1,2). The project was started in August 2001 at Surrey Satellite Technologies Limited (SSTL)'s facilities in Guildford, UK and BILSAT-1 was launched successfully from Plesetsk Cosmodrome, Russia in 27 September 2003. The main objective of the mission is remote sensing. The communications subsystem is a core system for Earth observation satellite. It is generally used for telemetry/telecommand signaling, software uploading and image/data transfer. The BELSAT-1 communications subsystem is composed of VHF/UHF (amateur space band) and S-Band (commercial space band). Link analysis is essential for design of any satellite communications subsystem to observe the quality of the link. The link budget should be calculated; the positive link margin has to be guaranteed at all elevation angles that the proposed design requires before the actual manufacturing process starts. For BILSAT-1 communications subsystem, the link budget calculator program has been developed at pre-design phase. The program calculates the received Eb/No and the required Eb/No, and gives the difference as the link margin with respect to the elevation angles. The communications subsystem parameters such as RF output power, antenna size/type, power consumption etc. both at ground station and on board have been optimized according to the simulated links. These parameters ultimately effects overall project cost and time schedule. Also, to aid pre-launch/inorbit test and to observe in-orbit link quality, some status points have been made available at BILSAT-1 satellite telemetry system. The measurements include a Received Signal Strength Indicator (RSSI) that provides an indication of the total signal power received. By using this data, the reliability of the link budget calculator program can be verified. In this paper, the above-mentioned link budget calculator program will be presented and the calculated and the actual link margins will be given and compared.
2006 IEEE Aerospace Conference

Suggestions

A two stage solid state power amplifier at X-band for satellite communication
Sen, Özlem; Dudak, C.; Nakiboğlu, Barış (2003-01-01)
Low earth orbit (LEO) satellites play an important role in earth observation and communication fields. Since communication with LEO has time limitation, it is important to have high data rate transmitters in addition to having properties as small volume, lightness and efficiency. In this work, an X-band (8.2 GHz) solid state power amplifier is designed with an output power of 7W, total gain of 18.0dB and bandwidth of 200MHz as a part of an onboard transmitter with data rate of 100 Mbps. The power amplifier ...
Radiation environment predictions for the IMECE satellite and G4Beamline simulations for the METU-DBL Project
Yiğitoğlu, Merve; Demirköz, Melahat Bilge; Department of Physics (2017)
IMECE Satellite will be an Earth observation satellite in Low Earth Orbit (LEO) planned for launch after 2020. Electronic components of the IMECE Satellite will be exposed to a radiation environment in its orbit in space which consists mostly of relativistic charged particles. This radiation environment which can affect the performance and reliability of sensitive materials and electronics is studied using the SPENVIS program. After simulating the space radiation environment, sensitive electronic components...
Determination of sea level trends and vertical land motions from satellite altimetry and tide gauge observations at the Mediterranean Coast of Turkey
Karabil, Sıtar; Karslıoğlu, Mahmut Onur; Demir, Coşkun; Department of Geodetic and Geographical Information Technologies (2011)
A radar altimetry satellite measures the height of sea surface globally. However, tide gauges, measuring Sea Level Height (SLH), are set up on the Earth surface. Hence, SLHs are involved in vertical motion of the Earth crust. In this study, vertical motions of Earth crust have been separated from sea level variations. After clustering of SSH observations with K-means approach, two outlier detection methods Pope and Interquartile (IQR) Tests are implemented in data. Afterwards, each altimetry measurement is ...
Orbit Control of an Earth Orbiting Solar Sail Satellite
Polat, Halis Can; Tekinalp, Ozan (2022-09-01)
A concept for the utilization of solar sail satellite's propellant-free thrust capability at Low earth orbit (LEO) is proposed and its orbit control strategy is analyzed. Thrust vector control of the sail's normal direction is used to harvest the solar radiation pressure for generating the necessary acceleration to change the orbital elements. The required control vector direction is determined with two approaches. The first approach is realized by approximating the Gaussian Variational Equations at the emp...
GPS-based real-time orbit determination of artificial satellites using kalman, particle, unscented kalman and H-infinity filters
Erdoğan, Eren; Karslıoğlu, Mahmut Onur; Department of Geodetic and Geographical Information Technologies (2011)
Nowadays, Global Positioning System (GPS) which provide global coverage, continuous tracking capability and high accuracy has been preferred as the primary tracking system for onboard real-time precision orbit determination of Low Earth Orbiters (LEO). In this work, real-time orbit determination algorithms are established on the basis of extended Kalman, unscented Kalman, regularized particle, extended Kalman particle and extended H-infinity filters. Particularly, particle filters which have not been applie...
Citation Formats
A. Telli and A. Es, “Link analysis for BILSAT-1,” Big Sky, MT, 2006, p. 1442, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/65094.