The first worksheet is used to set general parameters related to the networks being analysed. You may click on different parts of this image to find the function of that part.
This initial worksheet should be used to set the names, orbital positions and stationkeeping tolerances of the "wanted" and "interfering" networks, the name of the band being analysed (e.g. "C-band", "Ku-band") and the frequencies of the uplink and downlink and also to set some analysis options.
The network names, etc. and the frequency band data are self explanatory and need no further clarification. Note that entering the data for these items here causes them to be copied automatically into the title blocks of the other worksheets.
The analysis options need a little more explanation:
| Cell D19 | Uplink – Show C/N? | Entering a "Y" in this cell will add a simple C/N calculation to the uplink sheets (for both the wanted and other networks). This is useful in evaluating the viability of carriers, especially for the "other" network, but if the C/I sheets are being prepared to hand over to the other administration then it may be desirable not to include the C/N calculation. In this case, entering "N" in this cell suppresses the C/N calculation from the uplink sheets. | |
| Cell D20 | Uplink – Show Margin? | Entering a "Y" in this cell will cause the uplink analysis sheet to be calculated in terms of margin over protection ratio rather than C/I. Entering "N" in this cell (the default condition) will ensure that absolute C/I rather than margin is calculated. | |
| Cell D21 | Uplink – Show Other? | The normal condition for the C/I sheets is to calculate the C/I into both the "wanted" and "other" networks. However, if the C/I sheets are being prepared to hand over to the other administration then it may be desirable not to include the C/I calculation for the other network (i.e. it is for the other side to say how badly their network is affected). In this case, entering "N" in this cell suppresses the C/I calculation to the "other" network’s carriers, from the uplink sheets. | |
| Cell D22 | Uplink – Elevation Angle | In order to calculate the C/N ratio correctly it is necessary here to define the minimum elevation angle for which the earth-stations in the satellite network will be operated. This value should be entered here (in degrees); the default is a 5° elevation angle, which calculates the worst-case C/N ratio. | |
| Cell D23 | Uplink - Force upper cap on PR | Entering a "Y" in this cell will allow the definition of hard upper caps on the value of Protection Ratio applied to the uplink C/I analysis. Separate caps must be defined for digital, analogue and TV/FM emissions. This parameter is useful in the case where emissions have a high C/N value, leading to unrealistically high Protection Ratios being applied. | |
| Cell D25 | Downlink – Show C/N? | Entering a "Y" in this cell will add a simple C/N calculation to the downlink sheets (for both the wanted and other networks) This is useful in evaluating the viability of carriers, especially for the "other" network, but if the C/I sheets are being prepared to hand over to the other administration then it may be desirable not to include the C/N calculation. In this case, entering "N" in this cell suppresses the C/N calculation from the downlink sheets. | |
| Cell D26 | Downlink – Show Margin? | Entering a "Y" in this cell will cause the downlink analysis sheet to be calculated in terms of margin over protection ratio rather than C/I. Entering "N" in this cell (the default condition) will ensure that absolute C/I rather than margin is calculated. | |
| Cell D27 | Downlink – Show Other? | The normal condition for the C/I sheets is to calculate the C/I into both the "wanted" and "other" networks. However, if the C/I sheets are being prepared to hand over to the other administration then it may be desirable not to include the C/I calculation for the other network (i.e. it is for the other side to say how badly their network is affected). In this case, entering "N" in this cell suppresses the C/I calculation to the "other" network’s carriers, from the downlink sheets. | |
| Cell D28 | Downlink – Elevation Angle | In order to calculate the C/N ratio correctly it is necessary here to define the minimum elevation angle for which the earth-stations in the satellite network will be operated. This value should be entered here (in degrees); the default is a 5° elevation angle, which calculates the worst-case C/N ratio. | |
| Cell D29 | Downlink - Force upper cap on PR | Entering a "Y" in this cell will allow the definition of hard upper caps on the value of Protection Ratio applied to the downlink C/I analysis. Separate caps must be defined for digital, analogue and TV/FM emissions. This parameter is useful in the case where emissions have a high C/N value, leading to unrealistically high Protection Ratios being applied. |