Apparatus for measuring moving emitter elevation and azimuth dir

Communications: directive radio wave systems and devices (e.g. – Radar ew

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342 78, 342113, 342140, 342158, 342417, 342418, 342425, G01S 1306, G01S 1372, G01S 304

Patent

active

057740879

ABSTRACT:
An electrical surveillance measures system for measuring direction of arrival (DOA), i.e., both azimuth and elevation, of a pulsed or continuous wave radar signal from a moving emitter. Either carrier frequency or pulse repetition interval (PARI) Doppler shift are used whereby the ratio of the Doppler shift is measured by a moving observer. The DOA is measured as a unit vector having basis vectors formed from a linearly independent set of observer's velocity vectors. The DOA unit vector has a linear part where the coefficients of the basis vectors are derived directly from the ratios of frequency or PARI measurements taken in three contiguous dwells. The DOA unit vector has a nonlinear part formed from the requirement that the DOA vector have unit magnitude. The unit vector is resolved in the system coordinates in which emitter azimuth and elevation are defined to allow computation of the latter two values.

REFERENCES:
patent: 5343212 (1994-08-01), Rose et al.
patent: 5444451 (1995-08-01), Johnson et al.
patent: 5526001 (1996-06-01), Rose et al.
patent: 5689274 (1997-11-01), Rose

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