As born PolyITAN-1 in the laboratories of the CRPD

Development and manufacturing
The satellite was conceived a long time, although the development of a comprehensive plan as such was not, we can say there was a desire to start the development of the satellite without official support Space Agency of Ukraine, and the presence of the satellite at an early stage of development in our plans, National Technical University of Ukraine «КПИ ». Desire arose not out of the blue, in the department of nuclear engineering Thermophysics and Heat Energy at the Faculty KPI behind him a long history of close cooperation with the space industry. So, for cooling and thermal stabilization electronics artificial satellite "Sich" and "Ocean", space probes "Vega" and "Phobos", one of several German and Czech satellites use our heat pipes. But even by the faculty to pull the entire spectrum of work was impossible, because to look for specialists in other departments - were invited to develop employees with PEA, FEL, RTF, gather information and conduct consultations on various conferences, as it is, nevertheless, the first satellite. of the work that could be carried out under the pretext of specialized research faculty research have been done beforehand. Naturally most of the later had to redo, but experience in this matter would be superfluous.

For example the first version of the satellite body, steering centimeter Honeycomb, looked like.

As the collection of information, it turned out that many problems can be avoided by bringing the satellite to the format CubeSat and paying place in the group with other startup satellites. Thickness honeycombs decreased almost threefold mechanism undock was not needed, and the satellite should be placed freely within the test design, which is called canister and kindly offered us a firm ISIS , Delft (The Netherlands).

Test canister (we prefer to call it a platform) QuadPack to check the size, the satellite should slide freely inside.

Work on the three-dimensional model of the satellite is not a problem in the drawing space is added only to the specifics of the obligatory indication of the design coordinate system fixed coordinate system and the orbital coordinate system, and indicates the orientation of the sensors in these systems of coordinates. Algorithms in the correct orientation need to convert the measurement results using the transition matrix from one coordinate system to another. Besides the three-dimensional model is the simplest way to calculate the center of mass and moments of inertia of the satellite with the disclosed antenna.

Fee onboard computer complex (IOO charge pictured with a GPS receiver mounted on the «Navis-Ukraine» ) developed at TEFe us on embedded systems specialist hired specifically to work with the satellite. During testing we have managed several times to burn a COM port on the GPS receiver.

The first version of the board of IOO.

Engaged on the development of the radio radio department KPI, were laid two radio channels: one operates in the UHF band to the amateur radio frequencies 437, 675 MHz (wavelength ~ 70 cm) and is used to transmit a beacon signal in CW (CW) and telemetry at 9600 bit / c, and the other - for data transmission in amateur band of 145 MHz.

Photos during mining software fees.

When she was working, working out especially pleased transmit / receive data with the card BVK. For two months in the laboratory was a "squeak" from the ground receiver. Listen to "tune" on the site of amateur radio UY2RA .

Students with RTF and TEFa is installing rooftop Fifth Corps RGB antenna equipment and cabling from the roof to the seventh floor, where we are the control center.

Our antenna farm.

The board power supply subsystem with recesses for the wires. Develop a graduate student of the Faculty of Electronics KPI, he chooses LiFePO3 batteries and write to its board.

All dresses are made in «Kiev plant Radar» .

By bringing together the board, rather long practiced various algorithms and modes of the satellite. Average state workplace: power supply using polurazobrannom device simulating solar cells with a hit in the shadow of the Earth, the satellite feeds with batteries. Checks in which the battery is charged enough time, and in what not.

The photo immediately two satellites in different versions composure.

To control the orientation in such small satellites typically use magnetic coils which interact with the magnetic field of the Earth and the satellite is rotated. Interestingly, for their calculation used an old book over 35 years ago authorship Kovalenko AP "Magnetic control space vehicles» 1975 In step debugging instead of coils soldered resistors with twin diodes, which can be found in the photo above. < br />
If we talk about the complexity of the software IOO, it is easier to implement the task list:


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