A: Output Variables

Table 38: List of Output Variables

Variable

Description

Absolute

XYZ coordinates in the Earth Centred Earth Fixed Frame which is a Cartesian frame

ECEF-XYZ

centred at the ellipsoid origin

Ambiguity Drift

Drift on ambiguities over time; low ambiguities indicate stable solution

Antenna Height

Height of the pole or tripod above the station marker

Azimuth (1◊ 2)

Angle between true north and the baseline made from between FROM and TO

stations

Azimuth (2 ◊ 1)

Angle between true north and the baseline made from between TO and FROM

stations

Azimuth StdDev

Estimated error of the computed azimuth.

British-East, North

East and North coordinates in the British State Plane projection

C/A RMS

Root mean square of C/A code signal

Checksum (8-bit)

The absolute value calculated by using XOR, ADD, or NMEA methodology on the 8

data bits of each character in the sentence; decimal and hexadecimal formats may

be selected (user will be prompted for these options after the profile is created)

Combined

Scale factor used by surveyors. It applies the map scale factor combined with the

ellipsoidal height correction, which can be used to scale distances on the ellipsoid to

Scale Factor

the earth’s surface.

Combined

Combines east, north, up position standard deviations into one value. Same value is

Standard Deviation

written by Write Coordinates.

Computed Azimuth

Azimuth from base antenna to remote antenna in GrafMov.

Convergence

Meridian convergence for the current location in the current map projection

Corrected GPS Time

GPS time corrected for receiver clock bias

Course Over Ground

Direction of travel indicated by velocity vector.

Date

Date of the epoch or feature

Description

Description of the station or feature from the STA file

Distance Error (Azimuth)

Error in the computed baseline length in GrafMov.

Double Difference DOP

Double Difference DOP which is approximately equivalent to PDOP2

East, North, Height

Separations between the forward and reverse solution in the east, north, and height

Fwd/Rev Separations

axes

East, North, Height

Root mean square of the separations between the forward and reverse solution in

Fwd/Rev RMS

the east, north, and height axes

East, North, Up

Estimated east, north up position standard deviations in the local level frame

Standard Deviations

East, North, Up Velocities

East, North, Up velocity components in the local level frame

East, North, Up

Estimated east, north up velocity standard deviations in the local level frame

Velocity Standard Deviations

East, North, Up

When a 3-D offset is applied to camera event marks, this field can be used to verify

Offset Applied

that the proper offset is applied. This offset is oriented to local level that is, true-north.

ECEF

Estimated ECEF position covariance matrix; needs extended output in GrafNav

Covariance Matrix

Local Level

Estimated local level position covariance matrix; needs extended output in GrafNav

Covariance Matrix

Local Level Velocity

Estimated local level velocity covariance matrix; needs extended output in GrafNav

Covariance Matrix

Local Level XYZ

Local level left hand side frame where the x axis is pointing east, the y axis is pointing

north and the z axis is pointing up; the frame is centred at the master station

Local Plane XYZ

XYZ axes of a coordinate frame defined by two or more points (see local plane

options)

Local Time/Date

GPS time and date with time-zone offset applied

Longitude

East/West geographic coordinate

Map Scale Factor

Map projection scale computed for a location

Master File Name

Name of Master GPB file

Num Fwd+Rev or Comb Baselines

Number of baselines used in the combined solution.

Num GLONASS satellites

Number of GLONASS satellites

Num GPS satellites

Number of GPS satellites

Number of Satellites

Total number of GPS and GLONASS satellites

Orthometric Height

Height above the geoid (mean sea level height)

PDOP, HDOP, VDOP

Position dilution of precision, horizontal position dilution of precision and vertical

DOP. May be slightly different than values from other sources due to the differential

computation

Pitch Angle

IMU pitch angle (see IMU angle definition)

Project Name

Name of current project. Useful to separate multiple baselines in GrafNav Batch.

P2 RMS

Root mean square of P2 code signal

Quality Number

Quality factor from GrafNav; 1 (best) to 6 (worst)

Relative Azimuth

Azimuth between current and previous feature or epoch.

Relative

Relative height difference between current and previous epochs or features

Height Difference

Relative

Uncorrected horizontal distance on the ellipsoid between the current and previous

Horizontal Distance

epochs. Multiply by Combined Scale Factor to bring to mapping plane and surface

Relative

Free-air distance between neighboring epochs or features. Distance between

Slope Distance

current and previous.

Remarks

Remarks of the station or feature from the STA file

Remote File Name

Name of Remote GPB file

Roll Angle

IMU roll angle (see IMU angle definition)

Roll, Pitch, Heading

The difference between the combined solutions in terms of Roll, Pitch, and Heading.

Separation

Roll, Pitch, Heading StdDev

Estimated attitude accuracy.

Scale Factor

Horizontal distance ratio between the globe and the map distance for the current

point in the current map projection

Selectable Grid

Allows user to enter a north and east value for a user defined grid. Grids can be

modified and added using the Grid Manager (see Tools Menu).

Sequence Number

Allows the user to number epochs in the data with a user defined start and end

sequence number, as well as, an incremental value

Slope Distance

Free air distance between stations