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The portable balise programming set is low efficiency,which operation is manual.An onboard Euro-Balise programming device is proposed,which operation is automatic and high efficiency.The magnetic field and inductive voltage are calculated.The results show that the programming circuit in balise is activated by 9 MHz programming signal from transmitting antenna.8-shape programming receiving antenna of balise only works on the programming mode.It adopts special 8-shape designing,so that it is not activated on the normal work mode and does not affect the normal work of balise.The programming transmitting antenna and the programming receiving antenna of ground balise both adopt 8-shape which insures the enough power is supported to the programming circuit.