The Satellite signal analysis mode is organized into three sections: Satellite signals, Signal Parameters, and Identification Results.
Satellite Mode Display
Spectrum Settings
The spectrum settings are the same as in the spectrum mode. (See General Setup)
Detection, Identification and Analysis of Satellite Signals
The Satellite Signal Analysis option is both a scanner and signal analysis tool. This option allows the user to perform demodulation analysis on these types of satellite signals:
• DVB-S1
• DVB-S2
• IESS
Demodulation parameters such as data rates, modulation/coding schemes, SNR, MER, EVM, etc can be quickly provided on a satellite signal of interest. A unique feature of the analysis feature is the recording of important signal parameters as a moving average over time. Measurements such as MER and EVM are evaluated for trends. In this way, any developing degradation of the signal can be evaluated before it becomes a major problem.
After a certain frequency is scanned, the satellite signal of interest can be evaluated. In the 'Signal Parameters' window, select the type of signal to be analyzed: DVB-S1, DVB-S2 or IESS. Then enter the center frequency and bandwidth. Currently, SpectraVision limits the bandwidth of signals to be analyzed to a maximum of 20 MHz. Click on 'Start' to start the measurement.
One can add a horizontal threshold for Satellite signals to be captured by holding shift and left-clicking the mouse at the power level desired. Signals which fall below this threshold will not be identified. Remove the horizontal line by holding Shift and clicking the right mouse button. If a horizontal line is not placed, the scan will then identify all active Satellite signals regardless of amplitude.
To create a PDF or CSV file reporting the results of your scan, click on the 'Export' button located at the bottom right of the 'Signal Parameters' window.
Alarms
Located at the bottom of the Signal Parameters window is an Alarm button. The Alarm button will enable an alarm setup to be configured. If an email server is specified, an email alert will be automatically sent to a specified user. Alarms can be set according to the following parameters:
• EVM - alarm set when Error Vector Magnitude falls below a certain user-settable threshold.
• SNR - alarm set when Signal-to-Noise Ratio falls below a certain user-settable threshold.
• MER - alarm set when Modulation Error Ratio falls below a certain user-settable threshold.
The threshold is entered in the 'Alarm Settings' window. If desired, a delay can be entered to avoid alarming when a threshold is violated only for a short time. An 'Alarm Delay' value can be entered by the user. See Figure: Satellite Alarm Settings Window Showing Alarm Parameter Options. The left window displays the Parameter list with SNR highlighted. The right window displays SNR as the Parameter alarm selected.
