The SkyMon Base system offers operators the most useful foreground modes for basic carrier monitoring:
Gives the operator limited control of a manually-selected monitoring device. In this mode, SkyMon allows resource sharing for this monitoring device. Basically, the real-time carrier mode permits defining the most important settings of a monitoring device to be able to visualize the spectrum of the signal received by that device and to store/retrieve the displayed spectra.
Standard carrier measurement parameters
Typical carriers monitored by SkyMon are:
- Digital carriers
- FM-TV signals
- TDMA signals
- VSAT signals
- CW signals
On each type of carrier the system provides accurate measurements of the following parameters:
- Carrier EIRP
- Carrier-center frequency
- Carrier-occupied bandwidth
- Carrier-to-noise C/N and carrier-to-noise density ratio C/No
- -3dB/-10dB bandwidth for digital modulated signals
- Power spectral density
- Spurious signal detection and spurious signal measurement.
Beacon monitoring (EIRP, Frequency, C/N)
From a measurement point of view, a beacon signal is treated in the same way as any other carrier. From a configuration point of view, the operator can choose to use either dedicated entry fields provided within the space-segment configuration or to configure the beacon as an individual carrier (as indicated in the figure below). All SkyMon monitoring features (foreground, background) are applicable, regardless of the way a beacon signal is configured.
Beacon signals are treated in the same way as carrier signals. Therefore the same automated storage, scheduling and report mechanisms are applicable.
Automatic measurement scheduling with steerable antennas
The system allows the assigning of monitoring antennas to traffic pertaining to a particular satellite coverage (beam).
If the dedicated antennas are equipped with a tracking system, SkyMon can automatically point the antenna to the satellite(s) assigned for monitoring.
The presence of spurious signals (unauthorized carriers) is detected by means of a nominal traffic plan configuration, including dedicated masks. This means that the measured spectrum is compared to the expected mask, incremented by an individually configurable threshold (spurious detection threshold).
In case of interfering signals (mask violation), a spurious alarm will be triggered.
Events and alarms
The system distinguishes between alarms and events. Events are declared for out-of-limit measurements, such as exceeding a threshold (measurement events) or system anomalies (non-measurement events), such as malfunction of a device or simple logging tasks. Events may be classified in groups and linked to alarms.