Two-point sampling optimization method and system for sinusoidal excitation-based frequency response measurement

A two-point sampling optimized system for sinusoidal excitation-based frequency response measurement, wherein the two-point sampling optimized system for sinusoidal excitation-based frequency response measurement comprises:

• an estimation module, configured to estimate the interpolation error of each sub-frequency band divided by existing sampling points according to existing sampling information, wherein the existing sampling information comprises initial sampling points and newly added sampling points obtained by subsequent iterative calculation, Ns points are firstly collected as initial information, and then the iteration begins, and each subsequent sampling point is a global optimal point calculated on the basis of the existing sampling information;
• a selection module, configured to select the sub-frequency band with the largest interpolation error estimated among the sub-frequency bands, specifically:
• selecting the sub-frequency band with the largest interpolation error estimated among the sub-frequency bands specifically is as follows:
• comparing all 2N−4 interpolation errors of gain and phase together, selecting the largest value, and determining the corresponding sub-frequency band [fi,fi+1,fi+2], with the two newly added sampling points located in [fi,fi+1] of the sub-frequency band [fi,fi+1,fi+2] or in [fi,fi+1,fi+2];
• an optimized module, configured to add two new sampling points within the sub-frequency band with the largest interpolation error;
• a sampling module, configured to repeat the process from the estimation module to the optimized module until the quantity of sampling points reaches the preset quantity of total sampling points, a current round of sampling ends;
• and
• a circulation module, configured to add new sampling points and shift to the estimation module until sampling ends.