Near obstacle detection system

Details Near obstacle detection system Near obstacle detection system

1988-06-20

1990-02-13

Tarcza, Thomas H.

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

Determining distance

With frequency modulation

342 70, G01S 1334, G01S 1393

Patent

active

049010832

ABSTRACT:
In a radar system, an RF signal is transmitted at a frequency modulated by a sawtooth signal. The transmitted RF signal is mixed with the transmitted signal reflected from an object. The resulting IF signal is analyzed into a Fourier series having a DC coefficient and harmonic frequency coefficients. The range to the object is determined from the harmonic frequency coefficients in multiples of the range resolution determined by the RF bandwidth of the system when the DC coefficient is less than each of the harmonic frequency coefficients. The range to the object is determined to be within 1/2 the range resolution determined by the RF bandwidth when the DC coefficient is greater than each of the harmonic frequency coefficients.

REFERENCES:
patent: 2907023 (1959-09-01), Skinner
patent: 3108273 (1963-10-01), Erst
patent: 3182323 (1965-05-01), Nilssen
patent: 3893114 (1975-07-01), Yamanaka et al.
patent: 4079377 (1978-03-01), Zur Heiden et al.
patent: 4620192 (1986-10-01), Collins
patent: 4737791 (1988-04-01), Jean et al.

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