The Figure of Merit "C" for Comparing Superresolution Direction-Finding Algorithms

In this paper, the parameter C is introduced asa figure of merit for comparing the performances of practicaldirection-finding (DF) algorithms in terms of their superresolutioncapabilities. C takes values between 0 and 1, with highervalues indicating better resolving capability and C = 1 denotesan algorithm with the theoretically ideal resolution performance.Analytical expressions for C can be derived for a numberof DF algorithms. In this paper, three such expressions arederived for MUSIC, ‘optimal’ Beamspace MUSIC and MinimumNorm. It is found that optimal beamspace MUSIC yields thesmallest resolution separation, which can approach the idealwhen incident signals have equal powers.