Perform C/I and C/N Analysis

For visual browsing of ITU space database files, intersystem interference calculation, intersystem frequency overlap analysis and frequency coordination support

Sat-Coord can be used to interrogate and retrieve information from the ITU database files (including the SRS, IFIC and backlog) quickly and accurately. Search criteria can be defined to retrieve just the information you need, and the results can be exported to any text or csv compatible application.

In order to best describe the features that Sat-Coord offers, a few examples of searches which can be performed with the software are shown below, but bear in mind that searches from within Sat-Coord are completely freeform in nature meaning you can start with any search, and perform any search from this.

C/I Interference Analysis

This Excel-based part of Sat-Coord supports the satellite network frequency coordination process by calculating matrices of inter-system interference and margin, for any user-specified pair of satellite networks.

These charts allow identification of interference, and allow real time re-calculations during coordination meetings in order to try to overcome these interference problems.

In the example to the right, and below, the inter-system interference between two fictional networks TEST-SAT A (35°E) and TEST-SAT B (38°E) has been found in the C-Band Uplink.

The first diagram (right) shows the C/I values between the most interfering and most sensitive carriers.

The second diagram (below) shows the C/I margin between the most sensitive and most interfering carriers.

From the diagram areas of negative margin can be found, and worked on during the meeting to try and reduce them as much as possible.

ITU-R Recommendations S.740, S.741, S.483, S.671, S.466, S.735, S.465, S.580 and S.523 are used extensively and embedded in the Sat-Coord C/I analysis software

Sat-Coord can perform an MSMI analysis to find the subset of the most interfering and most sensitive carriers for any user-specified set of data that may then be used in carrier to interference analysis.

Finding the most interfering and most sensitive carriers is an important process in order to reduce the workload during a coordination meeting. Some networks have thousands of combinations of carrier types, powers and gains. In order to ensure that carriers are fully protected, we need to compare our most sensitive carriers against the most interfering carriers of the other network. In the same way, we can calculate the most interference our networks can cause to opposing networks by comparing our most interfering carriers with the most sensitive carriers of the other network.

Sat-Coord finds the most interfering and most sensitive carriers of differing carrier types - narrow band digital, wide band digital, FMTV, FDM, and TT&C - in order to allow maximum flexibility in the coordination meeting environment.

Carrier code, type, powers and gain information is retrieved for each of the user selected networks and the results are output in either text or csv format.

An example of an MSMI output for a fictional network TEST-SAT A is shown below. This process can be repeated for both networks and the data can then be copied and pasted into the C/I Interference Analysis tool to make calculations based on the data.

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