Hemisphere GPS Crescent V100 Series User Manual

Supplemental Sensors Common Commands and Messages
Crescent V100 Series
Quick Reference Guide
(Part Number 875-0185-000 Rev. A1)
A tilt sensor and gyro are integrated in the Crescent V100/
V110. The user can turn either on or off. However, the
system’s performance is optimized with both on.
GYRO AID TILT AID
Purpose Smooth rate of turn:
-Provides alternate
source of heading for
up to 3 minutes
when GPS lock is lost
-Shortens
heading
reacquisition
time
-Smooths rate of
heading
-Reduces startup
and
reacquisition
times for
obtaining
heading
Calibration
Procedure
Will self-calibrate after
several minutes
To manually calibrate:
-After heading is
computed
-$JATT,GYROAID,YES
-Spin Vector for 1
minute at less than
15
o
per second
-Leave unit stationary
for 4 minutes
**It is not necessary
to recalibrate with
standard use because
the gyro selects the
calibration.
Precalibrated
during
manufacture
To recalibrate:
-Ensure Vector is
level
-$JATT,TILTCAL
Differential Commands
$JDIFF Differential mode
$JWAASPRN Configure for specific SBAS PRN numbers
$JGEO Query for current location and satellites
$JASC,D1 Request SBAS diagnostic information
$GPMSK Tune beacon to specific frequency
Serial Port Setting Commands
$JBAUD RS-232C, RS-422 (output) communication rate
NMEA Messages
$GPGGA GPS fix data
$GPGLL Geographic position - lat/long
$GPGSA GNSS DOP and active satellites
$GPGSV GNSS satellites in view
$GPVTG COG and ground speed
$GPZDA Time and date
$GPHDG Provides magnetic deviation and variation for
calculating magnetic or true heading
$GPHDT RTK-derived GPS heading
$GPROT RTK-derived GPS Rate of Turn
$PCSI,1 Beacon status
$PSAT,HPR Heading, pitch/role and time in single message
$GPHDM Magnetic heading (based on RTK-derived GPS and
magnetic declination)
$J4STRING Output GPGGA, GPVTG, GPGSA and GPZDA (1 Hz max)
Heading Parameter
$JATT,TILTAID Enable/disable accelerometer,
pre-calibrated
$JATT,TILTCAL Calibrate accelerometer
$JATT,GYROAID Enable/disable gyro
$JATT,LEVEL Enable/disable level operation
$JATT,HTAU Set/query heading time constant (0.0 to 3600.0 sec)
$JATT,PTAU Set/query pitch time constant (0.0 to 3600.0 sec)
$JATT,HRTAU Set/query heading rate time constant (0.0 to 3600.0 sec)
$JATT,COGTAU Set/query COG time constant (0.0 to 3600.0 sec)
$JATT,SPDTAU Set/query speed time constant (0.0 to 3600.0 sec)
$JATT,HBIAS Set/query heading bias (-180.0° to +180.0°)
$JATT,PBIAS Set/query pitch/roll bias (-15.0° to +15.0°)
$JATT,NEGTILT Enable/disable negative tilt
$JATT,ROLL Configure for roll or pitch
$JATT,NMEAHE Changes the HDT, ROT, HDG and HDM message
headers between GP and HE (or HC)
Crescent V100 - DGPS
Crescent V110 - DGPS + Beacon
www.hemispheregps.com

Hemisphere GPS Crescent V100 Series Specifications

General

Brand	Hemisphere GPS
Model	Crescent V100 Series
Category	Antenna
Language	English