METHOD FOR LFM RADAR ACCURACY IMPROVEMENT WITHOUT INCREASING FFT LENGTH
First Claim
1. A method of determining a frequency of an echo signal obtained by a radar system, comprising:
- receiving the echo signal at a receiver in response to a source signal of the radar system;
multiplying the echo signal by a harmonic component signal to obtain a combined signal; and
performing, on a processor, a Fast Fourier Transform (FFT) on the combined signal to obtain a peak in a frequency space, wherein a central frequency of a frequency bin in the frequency space is shifted with respect to the frequency of the echo signal by the harmonic component signal; and
determining the frequency of the echo signal from the shifted central frequency.
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Abstract
A method and apparatus for determining a frequency of an echo signal obtained by a radar system is disclosed. The echo signal in response to a source signal of the radar system is received at a receiver. A harmonic oscillator generates a harmonic component signal, and a multiplier multiplies the echo signal with the harmonic component signal to obtain a combined signal. A Fast Fourier Transform (FFT) is performed on the combined signal to obtain a peak in a frequency space, wherein a central frequency of a frequency bin in the frequency space is shifted with respect to the frequency of the echo signal by the harmonic component signal. The frequency of the echo signal is determined from the shifted central frequency.
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Citations
16 Claims
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1. A method of determining a frequency of an echo signal obtained by a radar system, comprising:
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receiving the echo signal at a receiver in response to a source signal of the radar system; multiplying the echo signal by a harmonic component signal to obtain a combined signal; and performing, on a processor, a Fast Fourier Transform (FFT) on the combined signal to obtain a peak in a frequency space, wherein a central frequency of a frequency bin in the frequency space is shifted with respect to the frequency of the echo signal by the harmonic component signal; and determining the frequency of the echo signal from the shifted central frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for determining a frequency of an echo signal obtained using radar, comprising:
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a receiver configured to receive the echo signal in response to reflection of a source signal generated by the radar from a target; a harmonic oscillator configured to generate a harmonic component signal; a multiplier for multiplying the echo signal with the harmonic component signal to obtain a combined signal; and a processor configured to; perform a Fast Fourier Transform (FFT) on the combined signal to obtain a peak in a frequency space, wherein a central frequency of a frequency bin in the frequency space is shifted with respect to the frequency of the echo signal, and determine the frequency of the echo signal from the shifted central peak. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification