Abstract:

n an ultrawideband directionfinding (DF) system, the limitation on the volume of an antenna affects the DF accuracy of the system and the capability of solving ambiguity seriously. And the utmost number of target signals, which can be resolved by the array, is limited by the aperture of antenna arrays. Some excellent algorithms, such as spatial smoothing algorithm and estimation of signal parameters via rotational invariance technique (ESPRIT) algorithm, lose even the aperture of antenna arrays. Aiming at these problems, an improved algorithm is proposed on the basis of the traditional algorithm of forthorder cumulants (FOC). The algorithm keeps the capacity of virtual array extending, removes data redundancy of the primary FOC matrix, and reduces the computer time effectively, thus providing necessary conditions for practical application. Both of computer simulation and practical measurement data simulation prove that the improved algorithm can implement virtual array extending speedily and inhibit from Gaussian colored noise to some extent at the same time.