Abstract:
This thesis conducting to have a discussion about communication subsystem
of Cube Satellites, considering ISRASAT1 prototype as a focal of point with
detailed description of CubeSat subsystems, transceiver components and
design procedures to reach final shape of the project. the output of this
research is a consistent design of CubeSat transceiver based on ISRASAT1
specifications by using some software tools such as Advanced Design System
ADS for Ultra Hight Frequency mixer and High Frequency Structural
Simulator HFSS for antenna design. Hardware implementation has been done
for TNC and AFSK modulator based on (Arduino Uno kit) with two Walkie
-Talkies to verify data transmission between Tx and Rx.
This study realized the main mission of ISRASAT1 prototype as transfer data
between CubeSat and ground stations over wireless link using UHF band
433MHz for telemetry as well as all of design procedures achieved after
calculate the link budget for 450 km distance between CubeSat and ground
station with considered losses and gains. Also, UHF Mixer has been designed
and obtained RF signal 433 MHz with -14.9 dBm after adding matching
networks at the input and output of mixer and applying BPF with 8 dB gain at
the output of mixer. Dipole antenna has been designed to meet ISRASAT1
specification with good results about 3dB gain, 2.9 VSWR and -5.9 dB as
insertion loss.
