Defense & Military Applications
High stability Low Power Oscillators are required in many different applications for defense:
• Software Defined Radios (SDR)
• Robust radiocommunications
• Positioning, Navigation, and Timing systems
• Inertial navigation
• Robust Time servers
• Critical timing infrastructures
• Radars
• Unmanned Autonomous Vehicles
Software Define Radio
Software-defined radio (SDR) is a radio communication system where components that have been traditionally implemented in hardware (e.g. filters, amplifiers, modulators/demodulators, etc.) are instead implemented by means of software on a personal computer or embedded system.
Software radios have significant utility for the military, which must serve a wide variety of changing radio protocols in real time. In the long term, software-defined radios are expected to become the dominant technology in radio communications.
THE IMPORTANCE OF PHASE NOISE
To maintain the RF communication in harsh environment, SDR Terminals require high stability clocks with very good spectral purity. For an OCXO, spectral purity is usually measured by Phase noise close to the carrier frequency which is critical characteristic. In RF communications systems, phase noise of the local oscillator in a transmitter or receiver can cause the signal spectrum to leak into adjacent channels, causing noise and interferences.
In the time domain, the phase noise will result in jitter. Jitter will change the quality of the digital modulation, resulting in higher bit error rates.
For SDR Terminal requiring high spectral purity and very low power, such as portable radio device (Handheld, Manpack, Vehicular, Airborne), selecting the appropriate low phase noise OCXO is essential to ensure overall system and application performance and reliability in a limited size/weight. EWOS10HP and SGTM10HP have demonstrated their very high results in phase noise with values such as -125dBc/Hz at 10Hz for a High-Performance Low Power OCXO @ 10 MHz (EWOS10HP) and for a power cost limited to 400 mW @ 25°C (to be compared with the 3W power consumption of other market OCXO alternatives).
Optimizing power consumption with EWOS10HP and SGTM10HP enables to reduce the battery capacity: which means a device with a smaller size, lighter, and easier to handle.
GNSS receiver robust to gps spoofing & jamming
Military Vehicles on field shall keep a secure radio link with their base, whatever the external constraint. On field, they can be facing GNSS spoofing and/or jamming. In such GNSS-denied area, they need a communication system resilient to maintain the RF link operational.
THE SGTM™ IN GNSS-DENIED AREAS
Integrating an high stability SGTM10HP as core oscillator for GNSS function gives the possibility to meet impressive holdover performances when vehicle is in GNSS denied Area, with a phase drift limited to ±1.5 µs (typ.) for 8 hours or ±2.5 µs (typ.) for 24h. In such denied area, the PNT system is not clocked anymore an accurate and stable GNSS time. The SGTM module emulates the PPS time as it properly synchronized the embedded EWOS™ OCXO before going in hold-over mode.
SGTM takes over the GNSS time and becomes the master clock, feeding the system with its stable PPS output. The performance of hold-over directly depends on the intrinsic capability of the OCXO to maintain its frequency drift as low as possible after few hours, days or weeks.
In addition, the SGTM10HP Timing module has a power consumption limited to 550mW @ 25°C, which is a great advantage when system is battery powered. Other market alternatives show a power consumption between 3W and 8W.
THE SGTM™ IN GNSS-DENIED AREAS
Integrating an high stability SGTM10HP as core oscillator for GNSS function gives the possibility to meet impressive holdover performances when vehicle is in GNSS denied Area, with a phase drift limited to ±1.5 µs (typ.) for 8 hours or ±2.5 µs (typ.) for 24h. In such denied area, the PNT system is not clocked anymore an accurate and stable GNSS time. The SGTM module emulates the PPS time as it properly synchronized the embedded EWOS™ OCXO before going in hold-over mode.
SGTM takes over the GNSS time and becomes the master clock, feeding the system with its stable PPS output. The performance of hold-over directly depends on the intrinsic capability of the OCXO to maintain its frequency drift as low as possible after few hours, days or weeks.
In addition, the SGTM10HP Timing module has a power consumption limited to 550mW @ 25°C, which is a great advantage when system is battery powered. Other market alternatives show a power consumption between 3W and 8W.
Others LP OCXO Applications
New Space
Industry
Underwater
New Space
Industry
Underwater
New Space
Industry
