Loosely Coupled and Tightly Coupled

Loosely Coupled (LC)

The loosely coupled (LC) method is a two-stage processing method where an inertial trajectory is processed with updates from a previously computed GNSS trajectory. In most cases, it is suggested to obtain GNSS updates from the combined solution; however, an alternate GNSS file (external trajectory) may be selected.

Figure-25

Tightly Coupled (TC)

The tightly coupled (TC) method processes GNSS and INS data simultaneously. This is typically the preferred method for computing GNSS + inertial datasets. Both the GNSS and IMU advanced settings can be accessed from the TC processing options window.

Figure-26