In ballistic missile defense

the situation of unresolved targets is of great threaten to the tracking

identification and guidance of ground based radars

and some special efforts must be adopted to deal with it

among which the detection of the presence of unresolved targets is the precondition and basis of all the others.In this paper

the range glint is analyzed in theory through the model of sample ratio established

and then its physical essence is also expatiated using echo spectrum aberration.Base on those above

a general likelihood ratio test is developed to detect the presence of unresolved targets

which uses the information of additional range measurement error introduced by range glint.Finally

the Monte Carlo simulation result identifies the validity of the models.