.  sensors-00-00000-t000_Table 0  ######   Standard deviation of monitoring value.    ---------------------------------------------------------------------------------   Satellite PRN   σ~*M*~ (General SD)\   σ~*M*~ (Proposed SD)\   Error Reduction\                   Unit: m                Unit: m                 Unit: %   --------------- ---------------------- ----------------------- ------------------   0               0.0000                 0.0000                  00.00    0               0.0000                 0.0000                  00.00    0               0.0000                 0.0000                  0    0               0.0000                 0.0000                  00.00    00              0.0000                 0.0000                  0    00              0.0000                 0.0000                  00.00    00              0.0000                 0.0000                  00.00    00              0.0000                 0.0000                  00.00    00              0.0000                 0.0000                  0    00              0.0000                 0.0000                  00.00   ---------------------------------------------------------------------------------  ![(**a**) Monitoring value error of general SD (above); (**b**) monitoring value error of proposed SD (below).](sensors-00-00000-g000){#sensors-00-00000-f000}  According