Study on Multipath Error Correction Using Squinted Sum Monopulse Method

Abstract

An 3D radar system can detect the distance, azimuth, and altitude of targets. The radar acquires target information using an electronic or mechanically steered narrow antenna pattern. It calculates the target altitude using the detected information. In addition, angular accuracy is improved by applying various methods such as monopulse. The radar angular accuracy is affected by external factors such as multipath effects that are caused by various factors such as the radar installation environment and the flight altitude of the target. Radar systems apply various methods to improve the detection accuracy degradation caused by multipath effects. The squinted sum monopulse method can reduce the detection errors of the radar in a marine environment with a high frequency of multipath effects. The radar utilizes a different monopulse pattern that calculates an angular error with a sum pattern steered upwards of the detection beam. This is a method of minimizing the influence of the multipath received signal incident downward through a difference pattern in which the gain falls sharply below the detection beam. In this study, the effect of the squinted sum monopulse method was verified through simulation, and the effect was confirmed by applying it to an early warning radar installed in a sea environment condition.