A novel sparse array geometry embedding two sizes of spatial invariances is presented for use with a new ESPRIT-based (estimation of signal parameters via rotational invariance techniques) algorithm for aperture extension. The half-wavelength invariance yields unambiguous but high-variance direction cosine estimates to disambiguate low-variance but cyclically ambiguous estimates from the larger invariance. With larger invariance at 60 half-wavelengths, resolution threshold for two closely spaced emitters is reduced by 50 dB and estimation error by 100-fold. Array design formulas are also presented.
|Number of pages||16|
|Journal||IEEE Transactions on Aerospace and Electronic Systems|
|Publication status||Published - 1 Dec 1998|
ASJC Scopus subject areas
- Aerospace Engineering
- Electrical and Electronic Engineering