M. Masugi et al., ELECTROMAGNETIC ENVIRONMENTAL MEASUREMENT SYSTEM EMPLOYING FREQUENCY LEVEL SELECTIVE PROCESS, Electronics & communications in Japan. Part 1, Communications, 78(5), 1995, pp. 100-111
This paper describes a method of measuring quasistationary electromagn
etic waves, whose level, generation time, radiation points, and rates
of the incidents are not always constant. Those quasi-stationary waves
radiated from the amateur radio, the land mobile station, and so on,
sometimes cause electromagnetic interference (EMI) and are rather diff
icult to detect. The frequency and the electromagnetic field level of
those waves can be detected effectively by frequency domain measuremen
ts using a high-resolution spectrum analyzer. This measurement system
detects EMI waves whose peak level is above a threshold line set in th
e specific frequency range. Measurements were also carried out in urba
n areas to investigate the environment for citizen-band. Results indic
ate that there is a close relationship between the occurrence rates an
d the human activities. This system is useful for detecting the cause
of EMI and establishing countermeasures against electromagnetic waves.