GOLIAT integrates three scientific experiments: a digital camera, a radiation measurement instrument, and a micrometeoroid detector.
- CICLOP - Earth observation camera
The digital camera on board GOLIAT is capable of taking pictures with a resolution of up to 3 megapixels. Three major components are part of this subsystem: the sensor board, the image processing and compression board, and a custom lens mount with a 57 mm focal length built at Pro Optica. For typical low Earth orbits the ground area in a picture will be of 50 x 70 km2, varying with the altitude and orientation of the satellite.
- DOSE-N - radiation measurement
As a sensor a photo sensible PIN diode is used in conjunction with a solid state scintillator. The cosmic radiation interacting with the scintillator volume generates photons with the wavelength in the sensible spectral domain of the diode. The electrical pulse generated by the diode will be proportional with the dose of radiation that produced it.
Total dose measurements will be conducted at regular intervals during the operation of the spacecraft in orbit, in order to obtain a complete data set. Due to the elliptical nature of the orbit, GOLIAT visits altitudes in the 300 km to 1450 km domain and thus reaches different regions of the radiation belt.
- SAMIS - micrometeoroid detector
The experiment's main objective is to study micro-meteorites using a highly sensible piezo-film situated on the -Z face of the CubeSat that servers as an impact sensor. Each collision between a micrometeoroid and the sensible area will generate an electrical impulse proportional with the energy generated at the impact.
The generated signal first passes through a charge amplifier and it is received at one of the ADC channels of the onboard computer, stored and transmitted to the ground operation center. Unlike the other two experiments onboard Goliat, the data will be acquired continuously, but only signals of above a threshold value shall be stored and relayed back to the ground station for further processing.
By studying the amplitude and the signal characteristics, an estimate of the micrometeorites flux shall be obtained for the satellite’s specific orbit. Prior to the space mission, measurements in the Bucharest laboratory confirm detection of high velocity micrometeorites of 10 μm and even less.