Above is a picture of a primary / secondary surveillance radar combo (top is secondary, bottom is primary).
What does the ASDE-X radar unit look like in real life?
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$\begingroup$ It isn't one instrument, it is the integration of multiple sources, such as the radar picture you posted, antennas, GPS, and ADS-B signals, so there is no "picture" of an "ASDE-X radar unit". $\endgroup$– Ron BeyerCommented Jun 6, 2018 at 23:41
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This page claims to show the Raetheon ASDE antenna at Boston Logan. However, Saab Sensis appears to be the prime contractor for the ASDE-X system. Boston does have an ASDE-X system, according to the FAA.
According to the above link, Saab provides the "Multi-Sensor Data Processor" that "fuses the surface movement radar, multilateration, ADS-B and terminal radar data into a single track that is correlated with flight plan information." So my guess is that Raetheon provides the radar antenna and Saab does the software integration, alerting, fusing, etc. Since the contract is in the US there may have been a requirement to use a US radar supplier.
As an interesting aside, Saab recently announced a third generation Surface Movement Detection antenna, the SR-3:
