Radar method and device for the measurement of distance

Details Radar method and device for the measurement of distance Radar method and device for the measurement of distance

1995-03-31

1996-04-02

Eldred, J. Woodrow

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

Determining distance

342124, 340618, 340612, G01S 1308

Patent

active

055044905

ABSTRACT:
Disclosed is a method for the measurement, by means of a radar, of the distance from a useful obstacle that is surrounded by parasitic obstacles but sends back an echo which is more powerful than their echos. This method of measurement can be applied to the measuring of the level of liquid in a vessel. It consists in transmitting a sequence of non-modulated microwave signals whose discrete angular frequencies are evenly distributed in a certain frequency band, demodulating the signals received in return for the transmitted signals, subjecting the received and demodulated signals to a reverse and discrete Fourier transform with a view to a coarse localization of the delay of the echo from the useful obstacle and a high resolution method for the localization of the radiating sources with a view to a more precise localization of the delay of the echo from the useful obstacle, said delay enabling the assessment of the distance from the useful obstacle to the radar. FIG. 5.

REFERENCES:
patent: 4450444 (1984-05-01), Wehner et al.
patent: 5406842 (1995-04-01), Locke
patent: 5420591 (1995-05-01), Annee et al.
L'Onde Electrique, vol. 64, No. 4, Aug. 7, 1984; Paris, France, pp. 28-37; Georges Bienvenu and Laurent Kopp; "Methodes haute resolution pour la localisation de sources rayonnantes".

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