was converted to 24 bit RGB format image data by way of interpolation filter, we calculate the coefficients of red ,green and blue color based on current background, using these coefficients to .

An interpolation filter based on over sampling theory and the theory of mean evaluation is designed,so as to increase ADC resolution and SNR (Signal Noise Ratio) through software.

And the realization of Nyquist filter, multiphase filter, interpolation filter, multiphase carrier are explained.

Realization of Interpolation Filter Based on DSP and the Analysis of Finite Wordlength Effects;

The interpolation filter is unique in the PL receiver,it directly affects the performance of the PL receiver.

The drawbacks of commonly used Deslauriers-Dubuc interpolation filter are that the redundancy is large and dual-regularity property is not good.

The loop of this method mainly includes interpolator, NCO control, timing error test and loop filter, resample.

The nonlinear and linear error models of initial alignment for strapdown inertial navigation system(SINS) on stationary base were discussed,the principle of nonlinear interpolation filtering approach was analyzed,and the algorithm of nonlinear interpolation filtering for system model with additive noise was introduced,then it is applied to initial alignment for SINS on stationary base.

Computer simulation show that the filter precisions of DD1 correspond to the filter precisions of EKF,and that the filter precisions of DD2 are near even over the filter precisions of UKF.