Deep Space Surveillance System Four

# 665

Name	Deep Space Surveillance System Four
Synonyms	D 3S 4;D-4
About	D-4 was the pre-decessor of the D-5 (or D 3S 5). Counter intelligence believed Kilrathi intel knew about it so it wasn't widely used. The D-4 model was the first that could do a doppler analysis of a burst signal and do a probable pinpoint of its origin.