This paper discusses the probability of detection enhancement at the fusion area scanned by two radars. The improvement is implemented by three techniques, scan rate modulation, scan-to-scan processing, and applying the probability of detection rules (AND, OR) to make a decision. The simulation results reveal that using AND rules with precalculation of the threshold is better at enhancing the probability of detection and reducing the probability of false alarm. Furthermore, scan-to-scan processing has a considerable influence on reducing false alarms. Moreover, scan rate modulation increases the probability of detection and maintains the probability of false alarm within a permissible limit.