Rotation error analysis on slant 45° dual polarisation radar feature extraction

Abstract

Polarisation is an inner property of electromagnetic wave. It has considerable significance to analyse the polarimetric feature of targets in target recognition and classification applications. Slant 45° dual polarisation measurement is widely used due to its low requirements on system complexity and data rate on the one hand, and good polarisation measure and anti-interference capabilities on the other. However, its performance is seriously affected by rotation angle of the polarisations in transmission and reception. Here, the impact of rotation error of the transmit–receive polarisations on feature extraction is assessed by theoretical derivation at first. The variations with rotation angles of the transmit–receive polarisations are then simulated using standard scatterers and ground targets data. This permits quantification of the resulting rotation error on slant 45° dual polarisation measurement. The impact of the rotation error on H/α and polarimetric similarity features is also quantified in results. Some practical advices on system design, calibration, and feature application are given at last.

Keywords

• feature extraction
• error analysis
• radar polarimetry
• object recognition
• radar interference
• interference suppression
• radar transmitters
• radar receivers
• calibration
• signal classification
• radar signal processing
• slant 45° dual polarisation measurement
• rotation angle
• transmit–receive polarisations
• standard scatterers
• polarimetric similarity features
• rotation error analysis
• slant 45° dual polarisation radar feature extraction
• electromagnetic wave polarisation
• target classification applications
• target recognition applications
• antiinterference capabilities
• calibration