EP 0470416 B1 19941012 - Track circuit with cross-correlation.
Title (en)
Track circuit with cross-correlation.
Title (de)
Gleisstromkreis mit Kreuzkorrelation.
Title (fr)
Circuit de voie avec corrélation croisée.
Publication
Application
Priority
DE 4025194 A 19900809
Abstract (en)
[origin: EP0470416A2] A track circuit is disclosed, the receiver (E) of which carries out, for the purpose of track-release indication, a cross-correlation between a track voltage tapped off on the track (GL) and a reference voltage which is derived from the transmission signal of the track circuit transmitter (S) or generated separately. The maximum of the cross-correlation is sought by receiver (E) and compared with a predetermined threshold value. An embodiment with purely digital operation uses a track current source as transmitter which is controlled by a completely modulated transmission signal which is read out cyclically from a ROM. A microcomputer serves for calculating the cross-correlation function in the receiver (E) and for evaluating and tracking the maximum. The reference voltage is generated with the aid of a further ROM in the receiver (E) which is programmed in the same way as the transmission-side ROM. <IMAGE>
IPC 1-7
IPC 8 full level
B61L 1/18 (2006.01)
CPC (source: EP)
B61L 1/188 (2013.01)
Designated contracting state (EPC)
AT DE ES
DOCDB simple family (publication)
EP 0470416 A2 19920212; EP 0470416 A3 19930512; EP 0470416 B1 19941012; AT E112735 T1 19941015; DE 4025194 A1 19920213; DE 59103215 D1 19941117; ES 2065584 T3 19950216
DOCDB simple family (application)
EP 91112161 A 19910720; AT 91112161 T 19910720; DE 4025194 A 19900809; DE 59103215 T 19910720; ES 91112161 T 19910720