The landing accuracy of the Automatic Carrier Landing System (ACLS) is significantly influenced by the measurement accuracy of the shipborne tracking radar. To address the impact of radar guidance measurement noise on the ACLS error, the characteristics of the flash angle noise and Gaussian range measurement noise were analyzed in detail. A radar simulator incorporating tracking inertia and measurement noise was established and integrated into the ACLS system to construct a three-dimensional landing guidance system. Through simulation, the influence on radar measurement accuracy and rudder surface dynamic changes was verified, and the maximum allowable variance of radar measurement noise for ACLS was determined, laying a certain foundation for engineering research.