Cryogenic LNAs Help Antennas Scan Deep Space
Celestia Callisto is using its cryogenic low-noise amplifiers (LNAs) to reach further into deep space. The cryogenically cooled LNAs, as contracted by OHB Digital Connect, are supporting OHB’s efforts to upgrade the Sardinia Deep Space Antenna (SDSA) and enable it to detect and capture extremely low-level signals from deep space. The SDSA (see image above) is part of Europe’s third-largest scientific radio telescope, Italy’s Sardinia Radio Telescope (SRT), constantly searching for radio signals from deep space.
The cryocooled LNAs provide high gain with extremely low noise figures at X- and K-band frequencies. They're maintained at low noise temperatures and, being equipped with cold heads from Sumitomo Heavy Industries, are designed for continual service without downtime for maintenance. The SRT incorporates a dedicated control center for reliable communication with spacecraft for near-Earth and deep-space missions.
The LNAs, which are installed in the three DSAs operated by the European Space Agency (ESA), increase the antennas' abilities to capture low-level signals due to the boost in receiver signal-to-noise ratio (SNR) provided by the high gain and low noise figures. The cryogenic LNAs are built for as much as 10 years of maintenance-free operation with significant improvement in noise temperature compared to the amplifiers they replace.
Jennifer Bernard, sales manager of Celestia Callisto, explained the company’s position in the deep space search for signals, “As specialists in creating advanced front-end solutions for ground station manufacturers and operators that enhance the performance of radio antennas, we are well placed to deliver the technology required for projects like this where durability, uninterrupted service, and robust operation are prerequisites.”
She added, “Our team is working alongside those from OHB Digital Connect, Telespazio, and the Italian Space Agency (ASI) to provide the solutions they need, based on our specialist knowledge of advanced RF technologies and commitment to excellent customer support.”
