US 11,892,535 B2 · Signal processing apparatus and signal processing method

Abstract

A signal processing apparatus that performs signal processing on a Doppler spectrum derived from a reception signal of a reflected wave of pulsed undulation repeatedly transmitted into a space removes a topographic echo spectrum from the Doppler spectrum and extracts a plurality of candidate points of a target echo spectrum from the Doppler spectrum from which the topographic echo spectrum has been removed. Furthermore, the signal processing apparatus determines positional relation between the candidate points and a plurality of removed points of the topographic echo spectrum removed from the Doppler spectrum and extracts as an interpolation point, a point where the target echo spectrum is missing by removal of the topographic echo spectrum based on positional relation between the candidate points and the removed points in a direction of a frequency axis.

Claims22

Dependent claims

A signal processing apparatus configured to perform signal processing on a Doppler spectrum derived from a reception signal of a reflected wave of pulsed transmission waves repeatedly transmitted into a space, the signal processing apparatus comprising circuitry configured as:

a topographic echo estimator to estimate a topographic echo from the Doppler spectrum;
a candidate point extractor to extract a plurality of adjacent candidate points of a target echo, the target echo being obtained from the Doppler spectrum after removing the estimated topographic echo, a candidate point being a point where electric power is higher than a predetermined noise level;
a determination unit to determine a relation between the positions of candidate points and a plurality of removed points of a spectrum of the topographic echo estimated by the topographic echo estimator and removed from the Doppler spectrum;
an interpolation point extractor to extract as an interpolation point, a point where a spectrum of the target echo is missing by removal of the spectrum of the topographic echo, based on the relation between the positions of the candidate points and the removed points on a frequency axis;
and
a target echo reconstruction unit to reconstruct the spectrum of the target echo at a position of the interpolation point.

3 more elements

A signal processing method of performing signal processing on a Doppler spectrum derived from a reception signal of a reflected wave of pulsed transmission waves repeatedly transmitted into a space and resulting from removal of a topographic echo from a spectrum of a target echo and a spectrum of the topographic echo that are in a shape of an identical distribution function by using the distribution function, the signal processing method comprising:

a candidate point extraction step of extracting a plurality of adjacent candidate points of the spectrum of the target echo from the Doppler spectrum from which the spectrum of the topographic echo has been removed, a candidate point being a point where electric power is higher than a predetermined noise level;
a positional relation determination step of determining a relation between the positions of the candidate points and a plurality of removed points of the spectrum of the topographic echo removed from the Doppler spectrum;
an interpolation point extraction step of extracting as an interpolation point, a point where the spectrum of the target echo is missing by removal of the spectrum of the topographic echo based on the relation between the positions of the candidate points and the removed points on a frequency axis, and
an interpolation point reconstruction step, wherein
in the interpolation point reconstruction step, the spectrum of the target echo at a position of the interpolation point is reconstructed.

2 more elements

Dependencies are inferred from the claim text.

Signal processing apparatus and signal processing method

Life of this patent

Signal processing apparatus and signal processing method

Life of this patent

Abstract

Claims22