Spatial FOG Reference Manual
Page 47 of 144
Version 2.3
03/05/2018
4. If Spatial FOG loses a GNSS fix for any extended period of time during the
calibration, the distance travelled will be reset. The distance travelled can be
checked in the odometer configuration dialogue to ensure that it has passed
1000 metres.
5. Once 1000 metres has been driven, press the read button and check that the
automatic pulse length check box becomes un-ticked and the pulse length value
is read.
10.9
Reversing Detection
Reversing detection is an algorithm that can detect when the vehicle is travelling in
reverse. Knowledge of reverse motion is important when using velocity heading or
odometer input to provide correct results. If Spatial FOG is fitted to a vehicle that does
not reverse or doesn't use velocity heading or odometer, this function should be
disabled. Reversing detection is enabled by default and it can be disabled using the
filter configuration dialogue in Spatial FOG Manager, see section 11.8.2.
10.10 Motion Analysis
Motion analysis is an artificial intelligence algorithm that associates patterns in high
frequency inertial data with the speed of the vehicle. After power on it takes some
time to match patterns with speed before it will become active. Motion analysis only
activates when dead reckoning and is most efective when the vehicle is near
stationary. Motion analysis does not work in all situations and it's primary benefit is in
ground vehicles. When active it can be recognised by 2Hz steps in velocity data.
Motion analysis is disabled by default and can be enabled using the filter configuration
window in Spatial FOG Manager, see section 11.8.2.
10.11 RTK
Spatial FOG's internal GNSS receiver supports RTK GNSS which uses correction data
from a base station to provide significantly higher positional accuracy than standard
GNSS. RTK requires additional infrastructure equipment to receive corrections and is
not practical for all applications. There are three diferent options for receiving RTK
corrections. For applications where Spatial FOG can be connected to a computer that
has access to the internet, network RTK corrections are recommended, see section
10.11.1. For applications that are unable to access the internet we recommend base
station radio modem RTK corrections, see section 10.11.2.
10.11.1
Network RTK Corrections
Spatial FOG Manager has a built in NTRIP client that can connect to a network RTK
service to provide RTK corrections to Spatial FOG. Please see section 11.9.4. This
requires that the computer running Spatial FOG Manager is connected to the internet.
It also requires a valid subscription with a local network RTK service. Typically these
services will ofer a free trial period. Please contact
for assistance in getting set up for network RTK
corrections.
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