<FONT face=Verdana>For a given number of elements sparse linear array provides a larger aperture. However

it samples the incident signal non-uniformly

so the analytic expression of its peak sidelobes can’t be obtained by traditional FFT method. An analysis of side lobe structure of non-uniform sparse linear array based on lattice theory is presented. First

the array manifold lattice is modeled. Then the relationship between nearest lattice points and the peak sidelobes structure is investigated. Thus the problem of getting the sidelobe peaks becomes the problem of finding the nearest lattice points from the origin in array manifold lattice. This method can find the number and wavenumber vector with respect to peak side lobe whose gain is higher than the given gain precisely. Computer simulation results are presented to show its effectiveness and accuracy.