10 



OCEAN ELECTRONIC NAVIGATIONAL AIDS 



p^s^T^^"'' ^, «W"A' I'^l 



N4VIGAT0B ABOARD SHIP AT "N" IS WITHIN RANGE OF 

 STATIONS "M" AND "S" AND IS ABOUT TO RECEIVE LORAN 

 SIGNALS 



STEP IZ 



PULSE FROM "MASTER" STATION ARRIVES AT POSITION OF 

 NAVIGATOR "SLAVE" STATION HAS ALREADY RECEIVED 

 "MASTER" PULSE AND IS WAITING FDR PROPER AMOUNT OF 

 TIME TO ELAPSE BEFORE TRANSMITTING TO ASSURE CORRECT 

 SYNCHRONIZATION WITH "MASTER" 



LaSAN TRANSMISSION CYCLE IS BEGUN BY "MASTER" 

 STATION PULSE IS RADIATED IN ALL DIRECTIONS AND 

 TRAVELS TOWARD BOTH "SLAVE" STATION AND NAVIGATOR 



AFTER WAITING FOR THE PROPER AMOUNT OF TIME TO 

 ASSURE CORRECT SYNCHRONIZATION. THE "SLAVE" TRANS - 

 Mrrs ITS PULSE THE NAVIGATOR HAS ALREADY RECEIVED 

 THE PULSE FROM THE "MASTER" STATION. 



STEP sr 



"SLAVE" PULSE ARRIVES AT NAVIGATORS POSITION SINCE 

 NAVIGATOR HAS ALREADY RECEIVED THE SIGNAL FROM T>« 

 "MASTER" STATION, LORAN READING IS TAKEN BY 

 MEASURING THE TIME ELAPSED BETWEEN TME ARRIVAL OF 

 THE MASTER AND SLAVE PULSES AFTEJI BOTH SIGNALS 

 HAVE TRAVELLED THROUGHOUT THEIR EFFECTIVE RANGE 

 THE CYCLE IS REPEATED 



Figure 1-8. — Sequence of operation of Loian transmitting stations. 



