Patent ID: 11879970
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Measurement (Instruments)
Classification: CPC G  Y | IPC G

Claim 2:
3. A signal processing apparatus comprising:
a signal processor configured to
find a weather parameter based on a reception signal of a reflected wave of a pulsed transmission wave repeatedly transmitted into a space, a Doppler spectrum derived from the reception signal, and a topographic-echo-removed spectrum resulting from removal of a topographic echo from the Doppler spectrum;
find a first weather echo region based on a weather parameter among weather parameters that is different in behavior between a weather echo and the topographic echo;
find a second weather echo region based on a weather parameter among the weather parameters a behavior of which is not dependent on a Doppler velocity;
determine a weather echo region based on the first weather echo region and the second weather echo region;
provide the weather parameter in a range cell corresponding to the weather echo region determined by the signal processor to reconstruct the weather echo region;
find, as the first weather echo region, a first mixed region including a region where at least the weather echo and the topographic echo are together present;
determine, as a second mixed region, a region other than an overlapping region in the first mixed region where the first mixed region and the second weather echo region overlap with each other;
determine, as a common region, a portion in the overlapping region that corresponds to the second weather echo region;
determine, as the weather echo region, a combined region of the second mixed region and the common region; and
substitute a value of the second mixed region with a value resulting from removal of the topographic echo,
wherein among the weather parameters, the signal processor is configured to use at least one of variability in signal strength, variability in spectral width, variability in radar reflective factor difference, and variability in coefficient of correlation between polarized waves.