FMCW radar system for detecting distance, relative velocity and

Details FMCW radar system for detecting distance, relative velocity and FMCW radar system for detecting distance, relative velocity and

1996-12-11

1998-05-12

Sotomayor, John B.

Communications: directive radio wave systems and devices (e.g.,

Return signal controls external device

Radar mounted on and controls land vehicle

342115, 342127, 342196, 342107, 342113, 342133, 342146, G01S 1393, G01S 1360

Patent

active

057512400

ABSTRACT:
Beat signals of respective receiver channels CH1 and CH2, produced by mixing their receiving signals with a transmission signal, are subjected to Fourier transformation to detect the frequency and phase of peak frequency components in both an ascending-section where the frequency of the transmission increases and a descending-section where the frequency of the transmission decreases. Based on peak frequency components derived from the same target, phase differences .DELTA..phi.u(i) and .DELTA..phi.d(j) between receiver channels CH1 and CH2 in the ascending- and descending-sections (steps 210-230). Relative relationship between the transmission signal and the receiving signal is judged based on the signs of the phase differences. Respective peak frequencies fu(i) and fd(j), detected as absolute values of frequency differences between the transmission signal and the receiving signal, are given sings in accordance with the judgement result. Then, the distance D and relative velocity V of the target are calculated (steps 240-260).

REFERENCES:
patent: 4079377 (1978-03-01), Heiden et al.
patent: 4464662 (1984-08-01), Tomasi
patent: 5181037 (1993-01-01), Komatsu
patent: 5270720 (1993-12-01), Stove
patent: 5274380 (1993-12-01), Yatsuka et al.
patent: 5341144 (1994-08-01), Stove
patent: 5563602 (1996-10-01), Stove
patent: 5619208 (1997-04-01), Tamatsu et al.
patent: 5625362 (1997-04-01), Richardson

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