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US 10,884,114 B2Granted
Radar device
AssigneeMitsubishi Electric Corporation
InventorsFuyuki Fukushima, Teruyuki Hara, Satoshi Kageme
Life of this patent
Estimating the term…
Abstract
Transmission antennas (2-#1 to 2-#M) transmit radiowaves of frequency bands uncorrelated with each other. Receivers (5-#1 to 5-#L) receives target-reflected waves reflected by a target. Pulse compressors (7-#1 to 7-#L) and transmission DBF units (8-#1 to 8-#L) suppress false peaks generated by the Doppler frequency in the target-reflected waves and combines the target-reflected waves. A reception DBF unit (9) and a target detector (10) detect the target based on the results of the combined signals.
Claims6
A radar device comprising:
- a transmission module configured to concurrently transmit radiowaves of different frequency bands from antennas;
- a reception module configured to receive target-reflected waves transmitted from the transmission module and reflected by a target;
- a synthetic processing module configured to combine the target-reflected waves corresponding to the respective antennas, received by the reception module, in a manner that suppresses false peaks caused by shift to other frequency bands due to the Doppler frequency;
- and
- a detection processing module configured to detect the target using a result of the combining obtained by the synthetic processing module,
- wherein the transmission module includes
- M transmitters configured to generate signals having linear-frequency-modulated waveforms at different frequency bands where M is equal to or larger than 2,
- M transmission antennas configured to transmit the signals generated by the M transmitters as radiowaves, and
- M transmission-side A/D converters configured to convert the analog signals generated by the M transmitters into digital signals, and
- wherein the synthetic processing module includes
- L reception-side A/D converters configured to convert output signals of the reception module into digital signals,
- L pulse compressors configured to perform pulse compressions using output signals of the L reception-side A/D converters and the M transmission-side A/D converters, and using window functions defining notches that suppress the false peaks, and
- L transmission DBF units configured to combine output signals of the L pulse compressors based on the signals having different frequency bands, generated by the M transmitters.
10 more elements
A radar device comprising:
- a transmission module configured to concurrently transmit radiowaves of different frequency bands from antennas;
- a reception module configured to receive target-reflected waves transmitted from the transmission module and reflected by a target;
- a synthetic processing module configured to combine the target-reflected waves corresponding to the respective antennas, received by the reception module, in a manner that suppresses false peaks caused by shift to other frequency bands due to the Doppler frequency;
- and
- a detection processing module configured to detect the target using a result of the combining obtained by the synthetic processing module,
- wherein the transmission module includes
- M transmitters configured to generate signals having linear-frequency-modulated waveforms at different frequency bands where M is equal to or larger than 2,
- M transmission antennas configured to transmit the signals generated by the M transmitters as radiowaves, and
- M transmission-side A/D converters configured to convert the analog signals generated by the M transmitters into digital signals, and
- wherein the synthetic processing module includes
- L reception-side A/D converters configured to convert output signals of the reception module into digital signals,
- L pulse compressors configured to perform pulse compressions using output signals of the L reception-side A/D converters and the M transmission-side A/D converters, and
- L transmission DBF units configured to combine output signals of the L pulse compressors based on the signals having different frequency bands, generated by the M transmitters, wherein each of the L pulse compressors includes:
- M received-signal FFT units configured to perform Fourier transforms on output signals of the reception-side A/D converters to generate received signal spectra;
- M reference-signal FFT units configured to perform Fourier transforms on output signals of the transmission-side A/D converters to generate reference signal spectra;
- M multiplication circuits configured to generate compressed signal spectra from output signals of the M received-signal FFT units and output signals of the M reference-signal FFT units;
- M complex-window-function multiplication circuits configured to multiply window functions defining notches neighboring the false peaks, by output signals of the M multiplication circuits;
- and
- M IFFT units configured to perform inverse Fourier transforms on output signals of the M complex-window-function multiplication circuits.
16 more elements
Dependencies are inferred from the claim text.