Null preprocessing algorithm based DOA estimation for weak signals in presence of strong signals

作者：Li An; Wang Shu^*

来源：Journal of Information and Computational Science, 2011, 8(13): 2685-2691.

• Angular resolution
• Direction estimation
• DOA estimation
• Estimation performance
• Large power
• matrix
• MUSIC algorithms
• Pre-processing algorithms
• Root mean square errors
• Sensor output
• Signal to noise
• Singular values
• Strong signal
• Weak signals

Aim to the estimation of DOAs in presence of strong signals in the practical application, a method based on null preprocessing algorithm for weak signals'; direction estimation is studied, which first constructs a null weighted matrix based on singular value decomposition (SVD) to suppress the strong signals, then estimates the weak signal';s direction based on the preprocessing sensor outputs with MUSIC algorithm. The angular resolution for the DOA estimation of multi-sources with large power difference is improved compared with that of classical MUSIC algorithm. The proposed algorithm possesses the better estimation performance over JJM. Simulation results, furthermore, show that the correct estimation probability of the proposed algorithm is approximately 60%, and root mean square error (RMSE) of DOA estimation is less than 0.5 degree even when signal-to-noise ratio (SNR) is low only 0 dB.

• 出版日期2011
• 单位华中科技大学