It was shown that the self-noise of a molecular-electronic sensor was affecting the azimuth error
, and numerical and experimental simulations of such effect were carried out.
The system needs considerable time with GPS availability for the azimuth error state covariance to converge.
Since the azimuth error angle is only weakly observable, although the position estimate is accurate during GPS availability, the overall navigation accuracy suffers when several outages occur in succession.
The velocity's differences between SINS and odometer in the navigation frame and azimuth error
are regarded as the system's measurement vector.
In New England the difference between true and magnetic north (called magnetic variation or magnetic declination) can be more than 15[degrees], and it translates directly into an azimuth error
in the scope's pointing.
In the present study, given that the perspective compression effect occurs entirely within the elevation dimension, it is tempting to compare the effect of elevation error across GFOVs with the azimuth error
across GFOVs found by McGreevy and Ellis.
Inspired by the concept of principle of similarity using a known landmark point , a novel iterative in-motion fine alignment algorithm for vehicular DR based on SINS/ OD is developed in this paper, where a group of virtual landmark points from the map matching result is used to estimate the azimuth error
of SINS and the scale factor error of OD.
Dependent measures included azimuth error
, elevation error, and the percentage of trials resulting in a front-back confusion.
Watching the north or south drift of a star on the meridian reveals any azimuth error
. A similar drift for a star a few hours off the meridian shows altitude error.
The mean azimuth error
for the perspective display was 7.3 [degrees] (SD = 6.4), whereas the mean azimuth error
using the stereoscopic display was 6.9 [degrees] (SD = 9.2).
The remaining 32 769 target/entry pairings were analyzed on the basis of azimuth error
(angular deviation of the entry from the target), range error (Linear distance of the entry from the center point, or ownship position, as compared with the linear distance of the target from the center point), and total distance error (absolute linear distance from the entry to the target).
Because the technique cannot interrogate the donor radar directly, range and azimuth errors
should be expected.