Fortunately, a team of researchers led by Associate Professor Atsushi Shirane of Tokyo Institute of Technology (Tokyo Tech) have reported a novel phased array receiver strategy to reduce the effects of radiation degradation in these satellites. Their findings have been shared and published in the 2023 International Solid-State Circuits Conference. Dr. Shirane explains, “We propose a new phased array receiver strategy which involves on-chip distributed radiation sensors and current-sharing techniques. This helps to drastically reduce the effects of radiation degradation on the radio and power consumption.”
The team of researchers found out that in the conventional design of the phased-array transceiver on small satellites, the signal from the main lobe degraded by 3.1 dB in a year due to ionizing radiation. To solve this the researchers created a phased-array transceiver with on-chip distributed radiation sensors. These sensors can detect the gain variation between the chips of the antenna. This was combined with current-sharing techniques to mitigate the gain variation and thus reduce the impact of non-uniform ionizing radiation on the radio and power consumption. Upon testing this new strategy, the researchers found that it led to less than 10% of the typical gain variation seen in small satellites. The current sharing techniques also brought down the power consumption of the satellite to the lowest reported value. Overall, this strategy was able to reduce the main lobe degradation and bring down gain variation while using a minimal amount of power, solving two major problems faced by existing small satellites.
“Using the distributed on-chip radiation sensors and the current sharing techniques, we were able to drastically reduce the impact of radiation degradation and make the phased-array transceiver more energy efficient. This strategy,” concludes Dr. Shirane, “was found to be comparable to other state-of-the-art technologies at reducing gain variation. Thus, we believe that given its performance and efficiency, our strategy may lead to an even greater number of small satellites in lower Earth orbit, and a more well-connected world.”
We have our fingers crossed for this future!