Distance calculating method and system

Communications: directive radio wave systems and devices (e.g. – Determining distance – With frequency modulation

Reexamination Certificate

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Details

C342S070000, C342S118000, C342S195000, C342S196000

Reexamination Certificate

active

10690843

ABSTRACT:
In a system, a frequency-modulating unit is configured to frequency-modulate a radar wave signal within a predetermined frequency modulation range from bottom to top so that a frequency of the frequency-modulated radar wave changes in time. The rate of frequency change of the radar wave signal in time is set to F0/Tf. The F0 represents a center frequency in the frequency modulation range. The Tf represents the predetermined constant time. A mixing unit is configured to mix the transmitted frequency-modulated radar wave signal and the reflection signal to obtain a beat signal. The beat signal is based on a frequency difference between a frequency of the transmitted radar wave signal and that of the reflection signal. A sweeping unit is configured to sweep the beat signal within the frequency modulation range from one of the bottom and the top to the other thereof to obtain a frequency component of the beat signal. An obtaining unit is configured to obtain the prediction distance based on a relationship between the frequency component of the beat signal and the prediction distance.

REFERENCES:
patent: 5619208 (1997-04-01), Tamatsu et al.
patent: 5625362 (1997-04-01), Richardson
patent: 5920280 (1999-07-01), Okada et al.
patent: 5963509 (1999-10-01), Lindmuller et al.
patent: 6788247 (2004-09-01), Mitsumoto et al.
patent: 8-94749 (1996-04-01), None
patent: 9-90026 (1997-04-01), None
patent: 11-271432 (1999-10-01), None
patent: WO 02/067010 (2002-08-01), None
Notification of reasons for rejection in corresponding Japanese application No. 2002-311386 dated Mar. 13, 2007 (copy and translation enclosed).

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