What major component of the SIU contains circuit cards that perform radar control and signal processing?

The major component of the System Integration Unit (SIU) that contains circuit cards responsible for radar control and signal processing is indeed the signal data processor. This component plays a vital role in managing and processing the information received from radar systems. It interprets radar signals, applies necessary algorithms to filter and enhance the data, and ultimately allows for effective tracking and targeting of aerial threats. The signal data processor converts raw radar data into usable information that can be utilized by the air defense system for decision-making and operational control.

The control display unit is primarily responsible for providing operators with visual data and user interface components to interact with the system, not for radar control or signal processing. The data link processor manages communications and data transfer between various components, but it does not handle signal processing directly. The power distribution unit ensures that the system components are supplied with the necessary electrical power but does not engage in data processing or radar control functions.