RCS Estimation using LSTM at High Frequency

Abstract

RCS measurements are a helpful factor in the design of communication systems, antenna systems, and aircraft, where scattering and reflection of electromagnetic waves are essential. High-frequency RCS measurement time and expenses are relatively high in large objects, such as aircraft and ships. This paper introduces an AI model to solve the above problems and increase the RCS measurement efficiency. Among AI models, Long Short Term Memory (LSTM) has the advantage of solving the long-term dependence problem. Therefore, a method of LSTM and a parallel LSTM model are proposed to increase the accuracy further and reduce time in the model of LSTM. RCS was measured using a computer simulation CST, and low-frequency band data among CST-measured data was learned using Matlab. The RCS of the high-frequency band was estimated using LSTM and the parallel LSTM model. The estimated value of the LSTM model and the value measured by CST were compared with the estimated value of the parallel LSTM model. The high accuracy was confirmed through the results within the error value of the allowable range. In addition, the time was reduced significantly using LSTM and parallel LSTM than with CST.