Cesium Beam Frequency Standard for the PLSS Program

Frequency Elec t ronics has deve loped a low noise Cesium Standard to be used under dynamic vibrat ion environments. The PLSS ( P r e c i s i o n L o c a t i o n S t r i k e System), under development for the USAF by Lockheed Missiles and Space Company, r e q u i r e s a p r e c i s i o n and s t a b l e f r e q u e n c y r e f e r e n c e t o p e r f o r m i s s i o n t i m i n g and r ang ing func t ions . The f requency s tandard is l o c a t e d i n a h i g h f l y i n g a i r c r a f t and must o p e r a t e in a hos t i le envi ronment ( tempera ture and a l t i tude ex t remes , h igh shock and v ib ra t ion l eve l s , EMI) whi le main ta in ing f r e q u e n c y s t a b i l i t y o f 7 X Low s i n g l e s ideband phase noise must be main ta ined under condi t ion of random v ib ra t ion . Th i s phase no i se is less than -110 dBc a t 10 Hz, -120 dBc a t 100 Hz and -130 dBc a t 1000 Hz.