G - Physics – 01 – S
Patent
G - Physics
01
S
G01S 7/03 (2006.01) G01S 7/40 (2006.01) G01S 13/76 (2006.01) G01S 13/87 (2006.01) G01S 13/78 (2006.01)
Patent
CA 2101216
A method is disclosed for correcting measurement errors caused by clock deviations in a secondary radar system. To determine any deviation of the clocks of two ground stations (S1, S2; ... S1, S4) from each other, two interrogation/reply cycles are performed in direct succession in opposite directions over the same transmission path (d1 + d2): - Interrogation by ground station S1, reception of the reply from airborne station BS by ground station S2. - Interrogation by ground station S2, reception of the reply by ground station S1. The two transmission periods differ by twice the deviation of the clocks in the two ground stations S1, S2. The measured deviation is used to correct the measured transit time values and/or to synchronize the clocks. Synchronization of several ground stations with a master station is achieved by successive interrogation/ reply cycles between the master station (S1) and all other stations (S2 - S4).
Hofgen Gunter
Zeitz Rudiger
Alcatel Sel Aktiengesellschaft
Robic
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