Radar apparatus
AssigneeHitachi, Ltd.
InventorsHiroshi Kuroda, Kazuaki Takano, Mitsuru Nakamura
Life of this patent
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Abstract
The invention provides a radar that transmits a radio wave and receives an echo of the radio wave, which is characterized by possessing (1) a reception means that detects a beat signal of the echo and the radio wave, (2) a first frequency analysis means that analyzes the beat signal into frequency components, and detects a peak signal of frequency spectra obtained thereby, and (3) a second frequency analysis means that analyzes the beat signal into frequency components with a frequency resolution different from that of the first frequency analysis means, and detects a peak signal of frequency spectra obtained thereby.
Claims21
A radar that transmits a signal and receives a reflection signal of the signal, comprising:
- a reception means for detecting a beat signal of the reception signal and the transmission signal;
- a first frequency analysis means for analyzing the beat signal into frequency components with a first frequency resolution, and detecting a peak signal of frequency spectra obtained thereby;
- and
- a second frequency analysis means for analyzing the beat signal into frequency components with a second frequency resolution finer than the first frequency resolution, said second frequency analysis means analyzing the peak signal detected with a threshold value based on the peak signal detected by the first frequency analysis means, and detecting a peak signal of frequency spectra obtained thereby.
A program being executed in a radar, the program allowing the radar to execute the processing of:
- detecting a beat signal of a transmission signal from the radar and a reflection signal of the transmission signal from the radar;
- a first frequency analysis that analyzes the beat signal into frequency components with a first frequency resolution, and detects a peak signal of frequency spectra obtained thereby;
- and
- a second frequency analysis that analyzes the beat signal into frequency components with a frequency resolution different from that of the first frequency analysis, said second frequency analysis analyzing the peak signal detected with a threshold value based on the peak signal detected by the first frequency analysis, and detects a peak signal of frequency spectra obtained thereby.
A program being executed in a radar, the program making the radar execute the processing of:
- detecting a beat signal of a transmission signal from the radar and a reflection signal of the transmission signal from the radar;
- a first frequency analysis that analyzes the beat signal into frequency components by a first frequency resolution, and detects a peak signal of frequency spectra obtained thereby;
- and
- a second frequency analysis that analyzes the beat signal into frequency components by a second frequency resolution finer than the first frequency resolution, said second frequency analysis analyzing the peak signal detected with a threshold value based on the peak signal detected by the first frequency analysis, and detects a peak signal of frequency spectra obtained thereby.
Dependencies are inferred from the claim text.