| 摘要 |
PURPOSE:To always enable the most effective removal of noise, by a method wherein an adaptive digital filter is employed in a tracking radar. CONSTITUTION:A distance observation value R and an antenna azimuthal observation value theta for a target are separately inputted to a position computing filter 4, a speed computing filter 5, and an acceleration computing filter 6, and a position cordinate value, a target speed and a target acceleration speed of the output of each filter are sent to the corresponding adaptive digital LPF7-9. The true position of the target, the speed, and the estimated value of the acceleration speed are obtained at an output of the LPF7-9, respectively. A movement average of data for M pieces of input digital signals is taken by means of a movement average filter 10 in each of the LPF7-9 to output a smoothing signal. An estimated noise signal E, produced due to a difference between the output signal and a signal, which delays 11 an input signal, is sent to a movement mean width automatic tuner 12, and the period of the strongest frequency component is detected to decide a value of a parameter which relates to a mean width, and the noise, having the given frequency of the filter 10, is excluded. |
