The invention provides a split-type guided
wave radar liquid level meter based on gated
frequency modulation continuous
waves. The liquid level meter comprises an
electronics unit which is disposed outside a container with a to-be-measured liquid level, and is used for generating a transmitting
signal, a
coaxial cable which is connected with the
electronics unit and is used for transmitting the transmitting
signal to a coaxial wave guide rod arranged in a container with the to-be-measured liquid level, and a coaxial wave guide rod which generates echo signals based on the
frequency domain reflection principle and returns the echo signals to the
electronics unit, and then acquires height information of theto-be-measured liquid level. Remote installation of electronics and
radar probes can be realized, electronics are far away from a high-temperature, high-pressure and high-
irradiation container, and the working reliability of equipment is improved; a relatively large
system bandwidth is easy to realize in low-frequency application, the
measurement precision is improved, and meanwhile, the
miniaturization of equipment is facilitated; a gate controlled switch is adopted to control a transmitting channel and a receiving channel, so that relatively high
system transmitting and receiving isolation is realized; and the high-pass filter is adopted to effectively suppress
direct wave signals, and saturation of the intermediate-frequency
amplifier can be prevented.