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

Claim 3:
4. A signal processing apparatus comprising:
a signal processor configured to
find a weather parameter based on a reception signal of a reflected wave of pulsed undulation 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 weather echo region where a Doppler velocity is zero based on the weather parameter among the weather parameters;
determine a weather echo region based on a logical sum of the first weather echo region with the weather echo region where the Doppler velocity is zero;
provide the weather parameter in a range cell corresponding to the weather echo region determined by the signal processor reconstruct the weather echo region; and
cause a display to display at least one of the weather parameter and the reconstructed weather echo region, wherein
the signal processor is further configured to
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 weather echo region where the Doppler velocity is zero overlap with each other,
determine the weather echo region where the Doppler velocity is zero as a common region,
determine a combined region of the second mixed region and the common region as the weather echo region, and
substitute a value of the second mixed region with a value resulting from removal of the topographic echo.