The SRA unit is high performance miniature flight computer for use on sounding rockets and high velocity vehicles. The computer is highly configurable to mission requirements and additional modules can be integrated to meet extended mission and payload needs. Fully customisable firmware ensures maximum freedom for application development.
The SRA unit has early flight history on small sounding rockets including Rocket Lab's Ātea-1.
Physical
Size envelope: 50mm diameter x 150mm length
Weight: 250 grams
Environmental
Acceleration Mil109e
Shock Mil109e
Thermal 80°c
Power Supply
Separate analog and digital input rails designed to be used with 7.4V lithium polymer battery packs.
Digital Circuits
Low power 32-bit microcontroller with 32KB of RAM and 256KB of flash memory for fully customisable firmware implementations
9600 baud RS232 output only port for sending data to payload
Auxiliary SPI port for future expansion
Auxiliary I2C port for future expansion
4 High power switched outputs at 7.4V, current limited at 3A nominal, 7A peak
3 Low power digital I/O ports at 3.3V with capacity to add 5 additional
Micro SD memory card mounted in locking socket for extended data logging
Analog Circuits
Analog power and ground planes are separated for reduced noise
High accuracy 16 channel 16-bit analog to digital converter with pin compatible 24-bit version as a possible replacement
Analog temperature reading
Analog battery level measurement
Analog VCC and VREF measurement
6 Spare analog channels available for external sensors
Telemetry
Onboard 2.4Ghz wireless module for close range (100m) communication with computer
Variable baud rate RS232 serial port for data transfer to communication module
Iridium modem (9601) short burst for standard telemetry
Options for traditional RF telemetry
Inertial Sensors
50G X, Y and Z axis accelerometers
Dual sensitivity Z axis gyroscope with 2000°/s full scale range 0.5mV/°/s sensitivity and 440°/s full scale range 2.27mV/°/s sensitivity.
Dual sensitivity X and Y axis gyroscope with 500°/s full scale range 2.0mV/°/s sensitivity and 110°/s full scale range 9.1mV/°/s sensitivity
Note: Both gyroscopes are interchangeable with pin compatible 67° full scale sensors depending on application. Low power 3-axis Magnetometer
