Method and system for determining a modulus of speed of a carrie

Details Method and system for determining a modulus of speed of a carrie Method and system for determining a modulus of speed of a carrie

1997-07-10

1999-02-09

Sotomayor, John B.

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

Synthetic aperture radar

342115, G01S 1390

Patent

active

058700536

ABSTRACT:
A method and system for determining a modulus of a speed of movement of a carrier of radar, including (a) illuminating a same zone on the ground laterally, with radar of the carrier, at times t.sub.1 and t.sub.2 ; (b) measuring respective distances D.sub.1 and D.sub.2 of the carrier to the same zone at the times t.sub.1 and t.sub.2, and Doppler frequency shifts F.sub.d1 and F.sub.d2 of respective echoes returned by the same zone during the times t.sub.1 and t.sub.2 ; and (c) deducing the modulus .vertline.V.sub.h .vertline. of the speed of movement of the carrier based on a relationship ##EQU1## with .lambda. being a wavelength of a radar wave transmitted by the radar. The method and system require neither the locking of the radar to the carrier nor a course drift of the carrier. In this way, precision is improved and it possible to obtain accurate imaging radar modes having images in which distances can be measured with precision. The method and system can use results obtained during radar imaging for calculating the modulus of the speed of movement of the carrier.

REFERENCES:
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patent: 5166688 (1992-11-01), Moreira
patent: 5278757 (1994-01-01), Hoctor et al.
patent: 5469167 (1995-11-01), Polge et al.
patent: 5546087 (1996-08-01), Martin Neira

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