In this paper, a binary joint transform correlator (BJTC) based on an electrically-addressed spatial light modulator is described. The system mainly includes a cathode-ray-tube coupled liquid crystal light vavle (CRT-LCLV), a CCD camera, and a COMPAQ 386 computer. On the base of theoretical analysis, results of computer simulation and initial experiments are presented, and show that the correlator has good discrimination.