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Current version
Verze z 18.10.2006
- Projections of the sateit surface to the planes perpendicular to the Sun direction and to velocity vector can
now be displayed.
- It is possible to define mean reflectivity and drag coefficient in configuration files.
- Atmosphere density model (dependent only on altitude) finished. The magnitude of the drag force is now
computed properly. Only rotational effects of that force are simulated.
- A couple of small bugs in starting computations fixed.
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Older versions (newer first)
Version dated 10/09/2006, released for the World Space Week 2006
- Onboard magnetic coils model has been implemented. Currents of the coils can be driven by onboard modules outputs.
Power consumption model and various modes of coil driving included.
- First version of onboard ADCS software has been implemented. Software detumbles (slows down) initial rotation
using magnetic coils and then attempts to perform three-axis stabilization. 3D regulator not finished yet.
- Surface models have been implemented for the ability to model solar and atmospheric drag torque.
- Solar radiation drag torque model implemented and finished. Simulation of the solar sail effects is now possible.
- Atmospheric drag torque implemented. The size of the moment still not correct
- Drawing of the surface model projection in the direction of object's velocity is now possible
- Projection in the plane perpendicular to the sun vector can be displayed also.
- Surface models for simple cube and cube with two solar sail wings prepared
Version dated 09/12/2006
- Internal B-dot and B-cross regulators have been implemented. Just for preliminary testing of
this way of detumbling sattelite's initial rotation. Sattelite is being detumbled with respect to
surrounding magnetic field. Algorithm is internal only, magnetic moment is simulated, not generated
by onboard modules and coils. Practical implementation can be assumed to be slower.
- Onboard coils model finished. The currents of onboard coils can be determined by
outputs of onboard software modules.
- Principal axis of rotation from inertia tensor finished. Principal axes can be displayed
grahically, along with other new graphic features.
- New posibilities and options of data outputs to CSV files.
Version dated 08/14/2006
Model of isotropic rotational energy damping finished. Current version of simulator
is capable to fully simulate passive magnetic stabilization (permanent magnets plus damping).
Version dated 08/02/2006
- Rigid body rotation integrators finished.
- Gravitational and magnetic (residual dipole) disturbance torques implemented.
- Model of passive stabilization (permanent magnet) finished.
- Displaying of various new values, vectors and axes.
- A couple of mass and graphic models of the sattelite prepared for testing.
Version dated 07/10/2006
Mass model (modelling of mass distribution in sattelite object) finished. Computation of
the inertia tensor and center of mass coordinates.
Beta version of rotational integrators finished. Model of sattelite attitude and rotation.
Influence of external torques. Resulting angular velocity vector. Development of
values in time. Influence of non-diagonal inertia tensor. No direct connection
with onboard modules so far.
Additional camera modes (ORBIT-surface-fixed, ORBIT-ECI-fixed a ORBIT-body-fixed).
Dislaying of local ECI-axes and BODY-axes is now possible. Current angular velocity vector
can be displayed also.
Version dated 06/30/2006
Model of onboard communication serial bus finished. Exact simulation of token passing,
inter-module message passing (data messages interchange) including time-delay, delays
caused by module on/off switching and so on.
Complete set of onboard modules prepared and defined in configuration.
Power source for every module is controlled by the PowerModule, each of them can be
independently switched on or off by PwerModule.
Second version of MSDK released, skeletons of algorithms of all onboard modules prepared:
Power, Beacon, Radio, ADCS(+magnetometer), Photo, Tether, Sail, Science.
Version dated 06/21/2006
Big improvement of simulator controls. A lot of hotkeys, controlling is now possible using
menus.
Virtual X51 CPU finished. Onboard modules can be now defined in Satelit.cfg file.
Model of power switching of onboard modules, output of one module can drive the
power for another module.
First version of Module Software Development Kit (MSDK) released.
Version dated 05/18/2006
Ground stations model finished. Sattelite tracking, various values for data outputs. Ground
stations can be defined in Ground.cfg file.
Graphics can be switched off for better performance (see Orbit.cfg).
Data computation nodes for better data outputs.
Multipass support finished (multiple simulations with variable parameters are
now possible (see Multipass.cfg).
Support for virtual onboard processor for onboard modules under development.
Version dated 03/22/2006
Lighting model finished. New values for data outputs.
Local ECI-axes can be displayed, local magnetic axes (according the WMM model) can be displayed.
Magnetic vector components (Bx, By, Bz) with respect to magnetic axes can be displayed.
History of local magnetic vector can be displayed.
Version dated 03/15/2006
Graphics models of the sattelite finished. It is possible to define own graphic model.
Local magnetic vector computation finished.
Visibility border (area on earth surface where the sattelite is over the horizon) can be dislpayed.
Areas for a specific distance can be displayed - definition in Satelit.cfg.
Sun vector can be displayed.
Local magnetic vector can be displayed.
New values for data outputs (latitude, longitude, altitude, magnitude of magnetic vector)
Version dated 03/13/2006
Camera modes again functional, support for CSV data files output finished (see DataOutput.cfg)
.
Improved orbital model for simple but accurate position prediction (Enhanced Kepler).
File offline, download on demand.
Version dated 02/14/2006
Configuration on sattelites changed. Now the sattelites are defined in Satelit.cfg file.
It is possible to choose orbital model for a sattelite (NEWTON, KEPLER, SGP etc.).
Camera modes currently not functional.
Constellations finished (many thanks to M :-) )
File offline, download on demand.
Version dated 02/06/2006
Camera mode ORBIT working (still under development), mode FREE.
In the camera mode FREE, PgUp/PgDn move camera forwards/backwards.
In other modes, PgUp/PgDn zoom/unzoom the camera view.
Additional constellations added :-)
File offline, download on demand.
Version dated 02/02/2006
Camera controls fixed. Control keys: Arrows, Shift-arrows,
camera ROLL=ctrl+Arrow left, right.
Try other hotkeys: PgUp, PgDn, shift-PgDn, shift-PgUp. Camera modes can be switched by hotkey "C".
Only camera modes ECI, ECEF and SUN are working.
File offline, download on demand.
Version dated 02/01/2006
Constellations added (thanks, M), magnetic field lines can be displayed (press hotkey "M" repeatedly).
File offline, download on demand.
Version dated 01/30/2006
First working version. Huge development is necessary.
File offline, download on demand.