Performance Analysis of Oblique Projection Filtering Based on Polarization Sensitive Array

Abstract

The output SINR (Signal to Interference and Noise Ratio) of oblique projection and orthogonal projection filtering based on polarization sensitive array is investigated. The output SINR formulas of oblique projection and orthogonal projection filtering under both the ideal and array error conditions are derived. Related with the spatial and polarized matching coefficient between signal and interference under ideal condition, the output SINR is the function of the spatial and polarized matching coefficient between signal and interference, the Interference to Noise Ratio (INR), and the perturbation momentum under array error condition. The oblique projection filtering obtains the same output SINR as the orthogonal projection filtering under both conditions, while the output SINR of the maximum SINR principle filtering is the best. Further analysis shows that the oblique projection distorts the spatial and polarized properties of noise filtering while keeps the amplitude and phase properties of output signal which are distorted employing the orthogonal filtering. The simulation results attest the reasonability of the analysis of the paper.

Keywords

• Polarization sensitive array
• Oblique projection filtering
• Orthogonal projection filtering
• Array errors