What computes angle error data and provides corrective data to the antenna beam position control circuits in the AN/TPN-25 Precision Approach Radar (PAR) track video circuits?

The target data computer (TDC) is responsible for computing angle error data and supplying corrective information to the antenna beam position control circuits within the AN/TPN-25 Precision Approach Radar (PAR) track video circuits. This function is crucial because it allows the radar system to accurately track targets by adjusting the direction of the radar beam based on the calculated angle error.

The TDC processes data received from the radar, analyzes the position and movement of targets, and determines how to adjust the antenna to maintain the optimal tracking of these targets. Through its calculations, the TDC effectively ensures that the radar can effectively engage and maintain surveillance on targets, which is essential for precision approach and landing operations in aviation.

Other choices, while related to radar operations, do not perform the same function as the TDC. The digital moving target indicator (MTI) focuses on detecting moving targets and improving target discrimination but does not directly compute angle errors for beam positioning. The AN/UPM-145 Radar Test Set is primarily for testing and maintenance rather than operational tracking functions. Finally, the phased array antenna is a type of antenna that can electronically steer its beam but relies on the TDC's output to determine the necessary adjustments to the antenna's position.