Satellite Communications (SATCOM)
Satellite communication (SATCOM) systems, much like terrestrial systems, are pressured to increase bandwidth to
support modern, triple-play services. SATCOM is challenged as they must provide higher
data rates within a confined, licensed, radio spectrum.
To provide high-reliability services to mission-critical applications, reference frequencies to earth-station
equipment must be accurate, stable and have ultra-low phase noise. A GPS-based time and frequency standard is
the optimal solution.
Complex Digital Modulation Requires Low Phase Noise
The continued quest for maximum spectral efficiency has resulted in new digital modulation
techniques such as QPSK, 8-PSK and 16-PSK. These complex techniques support higher
data rates but are noise sensitive due to the small phase shifts. To ensure sufficient
signal-to-noise ratios, an ultra-low phase noise reference is required.
GPS Time and Frequency Standard
A GPS time and frequency standard locks to the atomic-clock-based, GPS satellite signals to produce a frequency
reference with excellent accuracy and stability. When equipped with a special, oven-controlled-crystal-oscillator
(OCXO), reference frequencies are generated with ultra-low phase noise.
The GPS time and frequency standard provides a common reference to the up-converters, down-converters,
modems, and encryption devices to ensure they operate to earth station frequency specifications.
High Reliability Frequency Reference for Large Earth Stations
Large earth stations support multiple services for a large number of customers and require a higher level of
reliability and redundancy. For a high-reliability frequency reference, redundant GPS time and frequency
standards are combined with a distribution system. The distribution system monitors the status of the
GPS references and automatically switches to the healthy system when a fault is detected. The distribution
system supplies multiple "copies" of the selected frequency reference to earth station equipment to
meet quality of service and availability requirements.
Contact Us for Pricing and More Information
Products for the SATCOM industry are listed to the right.
Other products and options are available. We also provide custom solutions.
For pricing and information contact us between 7 am and 4 pm Pacific Time: