Abstract: A system and method for making time error estimations and time corrections for substantially long deployment times are provided. The system has a low power local oscillator, a power source, a processor, a computer-readable storage medium, a phase meter, a counter circuit, a temperature sensor, and a communication port. Time signal measurements and frequency signal measurements are made at a first time and at a second time, and time-dependent or both time and temperature-dependent time error estimations are generated for interval times between the first time and the second time using a dual-linear estimation technique. A corrected time-tag data set having highly accurate time-tags may then be generated from the time-dependent time error estimation or both the time and the temperature-dependent time error estimation.