Influence of noise on accuracy of dielectric loss factor calculation
XU Zhini · Dianli zidonghua shebei · 2013
To evaluate the influence of noise type and content on the accuracy of dielectric loss factor calculation,the white noise is simulated by a random variable with normal distribution and the impulsive noise by a random variable with Cauchy distribution and limited amplitude,while the quantization noise of analog-digital conversion is programmed. The influence of SNR(Signal-Noise Ratio) and signal length on the error of dielectric loss factor is investigated and the calculation formulas of errors caused by mentioned noises are fitted. Results show that:the error caused by white noise or impulsive noise decreases along with the increase of SNR or signal length while the error caused by quantization noise decreases only along with the increase of digitalizing bits,immune to signal length. The formulas of errors caused by different noises are given.