An electronic tracked and ranging system is disclosed. Electronic tracked
and ranging system applies interferometer principles to determine ranging
distance from a monitor unit 10 to a tracked unit 12. In particular, the
system transmits a monitor direct sequence spread spectrum (MDSSS) 52
from a monitor unit 10 to a tracked unit 12. Afterwards, tracked unit 12
transmits a tracked direct sequence spread spectrum (TDSSS) 56. Finally,
monitor unit 10 receives TDSSS 56, performs a comparison to a reference
MDSSS 52 locks signals between MDSSS 52 and TDSSS 56 and outputs distance
between monitor unit 10 and tracked unit 12 using several phase
comparisons. Multiple frequencies within MDSSS 52 are phase detected so
as to increase accuracy of monitor unit 10 ranging distance to tracked
unit 12.