SC Modeler software was developed for the conceptual design, visualization and analysis of satellite constellations. It was written for aerospace engineers and other professionals involved in development of space-based communications systems, Earth observation systems, navigation systems.
SC Modeler provides an integrated modeling environment and all the necessary functionality for visualizing a satellite constellation and carrying out many tasks of constellation analysis including visibility studies and analysis of the geometry of communication links. The software includes a set of productivity tools which offers an efficient and convenient way of managing model properties, constellation parameters and design constraints.

The Constellation Editor tool makes it easy to visualize any type of constellation design. You can create a static or animated 2D or 3D view of a constellation and examine it interactively by mouse movements. The OpenGL-based visualization environment includes scalable 3D models of satellites, ground stations and a realistic view of the globe, created with ARC Science Simulations Inc.'s "Face of the Earth" data set. Multiple controls allow you to specify desired properties of image components. At any time you can switch between "Land with Ocean Depth" and "Land/Water Mask" textures or display a simplified constellation image. The Constellation Editor allows importing of orbital parameters of satellites from TLE (two-line or three-line element set) files.

- number of potential "ground station-satellite" connections for a given ground station,
- number of potential "satellite-satellite" connections for a given satellite,
- number of potential "satellite-satellite" connections per satellite in constellation,
- total propagation delay of the path for the exchange of information between ground stations,
- length of uplinks, downlinks and intersatellite links,
- intersatellite range rate and relative velocity of objects,
- ground- or satellite-based elevation and azimuth of uplinks, downlinks and intersatellite links,
- satellite's field of view.

The program allows you to determine access periods for any pair of network nodes: "ground station-ground station", "ground station-any satellite", "ground station-specified satellite", "specified satellite-any satellite", "specified satellite-specified satellite".
You can determine visibility intervals when the required number of satellites (the exact number or min/max values can be specified) is available to a given ground station or to a given satellite.

Dynamic output includes the list of time intervals during which access is provided (or not provided), the histogram which shows the distribution of time intervals, and relevant parameters:
- revisit time (maximum, minimum, average and current) which measures the duration of intervals during which access is not provided,
- duration of intervals (maximum, minimum, average and current) during which access is provided,
- total access duration, either in total time, or as a percentage, measured over the entire simulation interval.
- number of accesses/gaps over the entire simulation interval.

Constellation Design Modules
Constellation Design modules implement highly optimized search algorithms capable of producing an efficient constellation design for global or zonal continuous coverage, in a matter of seconds.
The Constellation Design/Circular Orbits module allows you to consider symmetric constellations  (known as "Walker delta" constellations) and "streets of coverage" constellations with polar or inclined orbits. 
The Constellation Design/Advanced Options module generates kinematically regular patterns with circular or elliptical orbits where all orbits have the same altitude, inclination and argument of perigee. In addition, this module allows you to generate constellation designs which ensure that a specified number of satellites will be visible at all times above the region of interest.
Constellation Design modules can help you to minimize the number of satellites required by the constellation if orbital inclination and altitude are specified (see examples). Alternatively, you can minimize the altitude of orbit for a given number of satellites and the orbit inclination.
Other inputs of the design task are:
continuous coverage area - entire Earth or latitude bounds,
constellation design constraints - number of orbital planes and number of satellites per plane (min and max),
access constraints - minimum ground elevation angle, maximum satellite sensor's field-of-view (conical half-angle), maximum ground station to satellite propagation range.

Coverage Analysis Module
The Coverage Analysis module allows you to determine the minimum number of satellites that will be available at all times to each point at given latitudes. Analyzed constellation can include any combination of satellites or groups of satellites with the same orbit altitude and inclination. If the constellation includes several subconstellations, each subconstellation can be analyzed separately. Individual access constraints for any group of satellites can be specified. The module generates the Coverage by Latitude tabular report and displays the results of analyses on a world map, with graphics depicting the various levels of coverage.

The Coverage Analysis module also allows you to undertake statistical analyses of visibility intervals for user-defined geographical regions. You can supply the exact locations of points, specify latitude bounds, or you can use 2D map to define custom regions. The program determines visibility intervals for each point in the coverage grid and creates an interactive report that shows the revisit time (max/min, average), coverage time, number of gaps and total coverage duration (%) measured over the entire simulation interval, etc. In addition, the current release allows you to determine visibility intervals when the specified number of satellites is available to grid points. The results can be grouped by latitude and by region. The report includes a histogram showing the distribution of durations of visibility intervals (or gaps) for a selected set of points.

Constraints Analysis Module
The Constraints Analysis module allows you to determine latitude-dependent values of the minimum ground elevation angle, maximum satellite sensor's field-of-view, and maximum ground station to satellite propagation range, all of which have to be maintained by the generated constellation in order to provide the desired type of continuous coverage (single, double, triple, etc.) at specified latitudes. Results are displayed in both graphic and tabular formats.

Network Topology Tool
The Network Topology tool offers unmatched possibilities for configuring and manipulating the topology of a large satellite network. With this tool you can create a set of connectivity rules by specifying combinations of the following parameters:
- number of intraplane links, which connect a satellite to its nearest neighbors within the same plane,
- relative position of orbits of satellites connected via interplane links (relative plane number),
- number of interplane links, which connect a satellite to its nearest neighbors in co-rotating or counter-rotating planes,
- latitude range within which the subsatellite point is located when intersatellite links of a specified type are active,
- group of satellites (subconstellation) for which the specified set of links is valid.
For any connectivity rule you can specify a time interval during which the rule is valid.

If the analyzed network can not be completely described by these parameters you can continue configuring the satellite network by activating or eliminating potential connections with the Matrix Editor. This interactive tool displays the current connectivity matrix and allows you to manage (activate or eliminate) network connections at various levels: between single satellites, between subconstellations, between satellites grouped in orbital planes, between satellites and ground stations, etc. 
For any group of network connections you can specify one or many time intervals during which the connections are active or inactive.