Say I have a file containing the following data lines:
Timestamp: 00:47:14 SATID 13 VAL1 28 VAL2 227 SIGNAL 37                                     SATID 15 VAL1 22 VAL2 265 SIGNAL 30 SATID 16 VAL1 22 VAL2 265 SIGNAL 30
Timestamp: 00:48:14 SATID 13 VAL1 28 VAL2 227 SIGNAL 37                                     SATID 15 VAL1 22 VAL2 265 SIGNAL NA SATID 16 VAL1 22 VAL2 265 SIGNAL 30
Timestamp: 00:49:14                                     SATID 14 VAL1 22 VAL2 265 SIGNAL 30