OBSERVATIONS   from Russia         11 Jan 2010

The Baumanetz Student Built Microsat.

Information supplied by Igor RW3XL and John LA2QAA    Additional material by Al GM1SXX

About Baumanetz.

The student built Microsatellite Baumanetz was a product of the Bauman Institute and intended for launch into LEO but was unfortunately destroyed in a launch accident. The satellite was dedicated to celebration of the 175th  jubilee of Bauman University.  Baunanetz carried a DOKA-B Command-navigation system. This was intended to operate in the 2M and 70Cms amateur satellite sub-bands and with some interest being expressed recently in DOKA-B on the EU-AMSAT Yahoo group, we wanted to create a short article about what is generally known about the system.

The Bauman Institute's website lists the  requirements for the Command-Navigation system as follows..

 Command-navigation system of the SC "Baumanetz" should provide:

• Radio communication with the Spacecraft in two radio bands with carrier frequencies of 145 and 435 MHz in both directions; Radio communication with the Spacecraft in two radio bands with carrier frequencies of 145 and 435 MHz in both directions;
• The command-navigation system should provide for operation control of payload (ПН) using either commands from the Earth or a time program from on-board control complex with RAM 2 Mbytes; The command-navigation system should provide for operation control of payload (Mon) using either commands from the Earth or a time program from on-board control complex with RAM 2 Mbytes;
• The command-navigation system should perform navigation sighting by signals from navigation satellites of GPS and GLONASS systems in any combinations with an accuracy by position not worse than ± 90 m and up to 15 m/s by velocity; The command-navigation system should perform navigation sighting by signals from navigation satellites of GPS and GLONASS systems in any combinations with an accuracy by position not worse than ± 90 m and up to 15 m / s by velocity;
• On-board complex should control power distribution to SC and payload systems, provide for control and monitoring of power and temperature control systems operation; On-board complex should control power distribution to SC and payload systems, provide for control and monitoring of  power and temperature control systems operation;

• The "DOKA-21" should provide for telemetering of the SC systems with documenting all interactions, distribution of power supply to the Spacecraft systems in accordance with a program of the vehicle initialization; The "DOKA-21" should provide for telemetering of the SC systems with documenting all interactions, distribution of power supply to the Spacecraft systems in accordance with a program of the vehicle initialization;
• The " DOKA -21" should provide for communication with a nonoriented spacecraft or with an spacecraft having disturbances in normal orientation. The "DOKA -21" should provide for communication with a nonoriented  spacecraft or with an spacecraft having disturbances in normal orientation.

The " DOKA -21" system will operate in an amateur frequency band. The "DOKA -21" system will operate in an amateur frequency band. This band opens for high number of Russian radio amateurs and radio amateurs of the entire world and widens project possibilities in the sphere of education and inter-college cooperation. This band opens for high number of Russian radio amateurs and radio amateurs of the entire world what widens project possibilities in the sphere of education and inter-college cooperation

These are in 'Thumbnail' form that link to full-sized images, so you can have good quality images.

(Click on Images)

Within Baumanets, the DOKA-B system appears to be interfaced to the remainder of the craft via the MIL-1553 Military-Specification Avionics serial bus system.    MIL-STD-1553

Below is another clickable 'thumbnail' showing how DOKA-B connects to the remainder of the satellite systems.

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