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