DefinePK

Abstract

Range resolution enhancement of weather radar will improve
the capability in observation of fine structure and motion of the atmosphere.
Based on range oversampling echo signals, the range resolution of weather radar
can be enhanced by using the MVDR algorithm. However, the MVDR algorithm is
computationally intensive due to the inversion of autocorrelation matrix of
echo signals and moreover, this inversion is not feasible as the autocorrelation
matrix of oversampling echo signals of real weather radar is singular. To solve
this problem, an improved MVDR algorithm based on steepest descent method is
proposed in this study which obtains the optimal weighted coefficient by recursion
and iteration and it can avoid the inversion of autocorrelation matrix. Simulation
results show that the proposed method can realize enhancement of the range resolution
of weather radar and its performance is greatly improved in comparison with
the previous MVDR algorithm.