  In this paper, a software implementation that records Global Positioning
System (GPS) and long-range navigation (Loran) measurement data output from an
integrated GPS/Loran receiver and organizes them based on time is proposed. The
purpose of the developed software is to collect measurements from multiple
Loran transmitter chains for performance analysis of navigation methods using
Loran, and to organize the data based on time to make it easy to use them. In
addition, GPS measurements are also collected and managed as ground truth data
for performance analysis. The implemented software consists of three modules:
recording, classification, and conversion. The recording module records raw
text data streamed from the receiver, and the classification module classifies
the recorded text data according to the message format. The conversion module
parses the classified text data, sorts GPS and Loran measurements based on
timestamp, and outputs them according to the software platform of the user to
analyze the measurements. Each module of the software runs automatically
without user intervention. The functionality of the implemented software was
verified using GPS and Loran measurements collected over 24 h from an actual
integrated GPS/Loran receiver.
