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The essential mission requirement of a satellite is the ability to provide a link to transmit information to and from the ground station. In general the communication system of the cube satellite is divided into two subsystems which are telemetry and data subsystem, and beacon subsystem. The telemetry and data subsystem will ensure continuous communication with the ground station. The beacon subsystem...
In satellites, the attitude determination and control subsystem is the module which is responsible for maintaining, monitoring and controlling the satellite attitude against the environmental disturbances torques, which affect the satellite orientation and leads to angular destabilization of the satellite while it is in orbit. ISRASAT1 project is a cube satellite research project that is run by the...
The attitude determination and control system is required by a satellite in order to monitor and control its orientation during orbiting around Earth. It operates in a similar manner of the autopilot used by aircraft and missiles. Sensors determine attitude of satellite, while actuators act to modify the orientation of it to point at a reference direction. For small satellites such as nanosatellites,...
Filtering of radar signals frequently takes place to realize a certain task, such as interference reduction or Doppler processing to remove clutter. However, in this paper a digital filter is proposed to be designed as a multifunction processor, achieving several sorts of signal processing within the same module. Processing is easily done in the baseband rather than in passband, for a moderately slow...
Controller area network is a shared serial bus communication that is widely used in automotive and industrial networks. The CAN bus is considerably affected by the conducted electromagnetic interference, which is generated from many disturbances such as load dumb and ignition system noise. The EMI reduces the bus efficiency by introducing bit errors in the data frame. In this paper, the effect of...
Special technique is proposed for the design of soft modems that would be appropriate to transfer text messages at up to 300 bauds. Modulation scheme used is audio frequency shift keying, which is suitable for transport of text messages through the voice channel over HF and VHF radios. The soft modem is primarily designed to be implemented using low cost microcontrollers, and without the need of analog...
A novel waveform design is proposed in order to fulfil several requirements and avoid many disadvantages encountered in some of known waveforms. The proposed waveform is a hybrid complex form that is named as the frequency-hopped/minimum peak-to-sidelobe (FH/MPS) waveform. Many computer simulations using MATLAB were made so as to investigate the FH/MPS radar waveform. Very significant results are...
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