H220 Integrator Guide
Chapter 2 – Board Overview
Page 9 of 28
Tracer™
Most accurate positioning tech-niches such as RTK and Atlas (Hemisphere’s L-band global
correction service) operate by using a correction data stream source.
Positioning methods are limited due to constant connectivity requirements with the correction
source. In most cases, the GNSS engine needs to receive correction data with very low data
interruption to maintain a reasonable position accuracy. For example, certain systems in the
GNSS market only allow as much as 10 to 20 seconds of signal interruption before RTK level
accuracy solution completely stops.
Tracer is a core feature used in Hemisphere GNSS products to sustain positioning in the
absence of corrections. With the use of specialized algorithms, Tracer™ greatly mitigates the
impact of correction loss on the system positioning accuracy.
Tracer is essential in an environment where connectivity over satellite, radio, or internet is
unstable, as it allows most users to operate with negligible loss of accuracy during outage
periods. The length of the outage and associated performance loss varies with the positioning
technique used and the satellite geometry and interference environment.
