Analysis of X-band RCS statistical characteristics of ship body in motion state

  Objective  In order to clarify the interference of ship movement on the radar cross section (RCS) measurement statistics of a real ship, the statistical characteristics of ship body X-band RCS under various motion states are analyzed.

  Methods  A dynamic RCS simulation method of a ship body under low sea state motion is established, and a unified model of hydrodynamic simulation and electromagnetic scattering is created on the basis of the DTMB 5415 benchmark surface ship model. The dynamic RCS data of ships detected by X-band radar at a horizontal incident angle are obtained, and the influence boundaries and rules of statistical time, sea state, speed and sea wave direction on the statistical features of RCS are analyzed.

  Results   The results show that the statistical characteristics of the dynamic RCS of a ship body are different from those in a static state. The influence range of the general values of RCS under low sea state, speed and wave angle is within 0.9 dB. The RCS of a ship's characteristic direction is sensitive to changes in the sea wave direction angle, and decreases gradually with the increase of the sea state.

  Conclusions  The results of this study can provide references for better understanding the interference of ship motion on the statistical characteristics of RCS measurement, and support the selection of real ship RCS measurement conditions.