DSA’s 1,650-dish grid to survey universe 100x faster with real-time GPU data processing

The California Institute of Technology (Caltech) has finalized design plans for the Deep Synoptic Array (DSA), an unprecedented radio observatory that will be the most sensitive radio telescope ever built.
Following a successful final design review funded by Schmidt Sciences, construction is slated to begin in a remote, radio-quiet valley floor located in Spring Valley, Nevada. The massive facility is engineered to survey the celestial sphere 100 times faster than any existing radio telescope, fundamentally altering how astronomers map the universe.
Historically, radio astronomy has faced a compromise between sensitivity and image clarity. Large single-dish telescopes excel at capturing incredibly faint cosmic signals but lack spatial resolution, while traditional multi-dish arrays take sharp photos but take longer to sweep wide areas.
The DSA resolves this layout bottleneck by deploying a sprawling constellation of 1,650 steerable satellite dishes, each measuring roughly 6.1 meters in diameter, distributed across a geometric grid spanning 20 kilometers (~12.5 miles) by 16 kilometers (~10 miles).
The ‘radio camers’ solution
Operating an array of this magnitude creates a staggering logistical obstacle: data volume. Combined, the 1,650 dishes generate raw electronic data equivalent to the entire current internet traffic of the United States.
To prevent a system crash, storing this information conventionally would require a multi-billion-dollar storage facility housing five million hard drives to hold roughly 100 exabytes of data.
To overcome this issue, Caltech researchers developed a specialized “radio camera” architecture. Utilizing an on-site network of graphics processing units (GPUs), the telescope automatically flags, cleans, and synthesizes the incoming streams of radio waves into finished, high-fidelity images in real time.
This pipeline immediately strips away raw data clutter, reducing the long-term storage footprint to just tens of petabytes per year. Furthermore, the electronics are kept highly stable through the use of specialized indium phosphide transistors that achieve exquisite sensitivity while operating at room temperature, eliminating the need for complex cryogenic cooling systems.
Cataloging a billion cosmic objects
The raw speed of the array will drastically reshape the catalog of known space phenomena. Over the last several decades, all global radio telescopes combined have cataloged approximately 20 million unique radio sources.
The DSA is projected to match that entire historical benchmark on its very first day of operational testing. Over its initial five-year all-sky survey window, the facility is expected to discover more than one billion previously unrecorded radio sources.
Led by Principal Investigator Gregg Hallinan, the telescope will provide critical open-source tracking data to help astrophysicists study fast radio bursts (FRBs), track moving pulsars, and observe black hole explosions. Project managers anticipate full construction to be finished with science operations commencing by 2029.
