The main box will be composed by the following units and subsystems:
Connectors plate Serves as an interface between the exterior and the subsystems housed inside the box,
and ensures we can easily open the box without having to disassemble everything.
Electric power system (EPS) Performs the conversion between the provided voltage level (28.8 V) to all
the different required levels, and distributes it to the remaining subsystems.
OBC Performs data handling of the samples captured by the software defined radio (SDR). Also performs several control and telemetry
tasks, and is connected to the E-Link system.
SDR board and RF frontend This subsystem is responsible for generating and transmitting the RF signals
that will be used by the SAR technique, and then performing the data collection of the respective
echoes. While the system will only be either transmitting or receiving (half duplex), the SDR will be
full duplex in order to detect when the pulses are sent, in order to achieve phase coherency.
Pressure control system monitors the pressure inside the inflatable antenna and performs
inflation or deflation, as needed. It also has a safety, mechanical valve that prevents the pressure to be
greater than a certain value.
Navigation system Measures the heading, position and velocity of the gondola. The GPS module is connected
to the OBC, and the digital compass is connected to the Arduino.
