Improved algorithm for fast frequency estimation with short sequences at low SNR

It is very important to give a fast estimatin of the damage range after the earthquake for the purpose of emergency rescue.

Frequency-shift-domain iterative analysis for frequency estimation of equilong signals;

Chirp Z transform-based high performance frequency estimation;

Approach of frequency estimation based on information fusion among multi-section signals with same length and known frequency-ratio;

The problem of frequency estimate about carrier wave infected by noise can be solved by the method,find the eigenvectors of the signal correlative matrix,then detach the noise subspace and signal subspace,and find the linear correlative based on signal subspace,or the orthogonal carrier based on noise subspace.