The invention discloses a control method of a frequency-selective
electromagnetic radiation monitor and relates to the technical field of
electromagnetic radiation detection. The present invention includes a range selection step and a
noise floor subtraction step. In the range selection step, the main controller acquires the
electromagnetic radiation signal at regular intervals and calculates the maximum strength of the current
signal, compares it with the end value of the
current range gear range, and performs an
upgrade according to the comparison result. The operation of shifting,
downshifting judgment and maintaining the gear position; the
downshifting judgment operation is to determine the duration of the maximum
signal strength less than the minimum value of the
current range gear, and if the duration reaches the configured time, the
downshifting operation will be performed. The invention adopts the mechanism of steep rise and slow fall to automatically adjust the range gear, which can avoid the situation of repeated change of the range gear due to the fluctuation and change of the electromagnetic
radiation signal. The invention can eliminate the influence of
background noise on the measured value, so that the frequency-selective
spectrum analyzer can accurately measure the
electric field intensity of the current environment no matter under any conditions.