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MR Marine
InView-USB GPS
WATERPROOF
Ultra High Sensitive
USB GPS Receiver
MR
Marine InView-USB is a GPS receiver with USB interfaces and built-in
active antenna for high sensitivity to tracking signal. MR Marine
InView-USB is well suited to system integration and users who use any
kinds Laptop PC. It satisfies a wide variety of applications for car
navigation, personal navigation or touring devices, tracking and marine
navigation purpose. Users can simply plug it into a LaptopPC running
with suitable mapping and routing software for navigation.
Standard Package:
Before you start up, make sure that your package includes the following
items. If any items are missing or damaged, contact your dealer
immediately.
- SiRF Star III-USB GPS Receiver unit
- Suction CUP
- User Manual CD (including User Manual
OVERVIEW:
Fast Acquisition Enhanced Sensitivity 20 Channels “All-In-View” Tracking
GPS Sensor Module.
The receiver continuously tracks all satellites in
view and provides accurate satellite positioning data. The SiRF Star III
is optimized for applications requiring good performance, low cost, and
maximum flexibility; suitable for a wide range of OEM configurations
including handhelds, sensors, asset tracking, PDA-centric personal
navigation system, and vehicle navigation products.
Its 20 parallel channels and 4000 search bins provide
fast satellite signal acquisition and short startup time. Tracking
sensitivity of -159dBm offers good navigation performance even in urban
canyons having limited sky view.
Satellite-based augmentation systems, such as WAAS and EGNOS, are
supported to yield improved accuracy.
FEATURES:
- 20 parallel channel GPS receiver
- 4000 simultaneous time-frequency search bins
- SBAS (WAAS, EGNOS) support
- -159dBm tracking sensitivity
- < 8 second hot start
- < 40 second cold start
RECEIVER OPERATION
Upon power up, after initial self-test has
completed, the HI-204III-USB will begin satellite acquisition and
tracking process. Under normal open-sky condition, position-fix can be
achieved within approximately 35 seconds (within 10 seconds if valid
ephemeris data is already collected from recent use). After receiver
position has been calculated, valid position, velocity and time
information are transmitted through the on board serial interface.
The receiver uses the latest stored position,
satellite data, and current RTC time to achieve rapid GPS signal
acquisition and fast TTFF. If the receiver is transported over a large
distance across the globe, cold-start automatic-locate sequence is
invoked. The first position fix may take up to 50 sec searching the sky
for the GPS signal. The acquisition performance can be improved
significantly if the host initializes the receiver with a rough estimate
of time and user position.
As soon as GPS signal is acquired and tracked, the
SiRF Star III-USB will transmit valid navigation information through its
serial interface. The navigation data contains following information:
- Receiver position in latitude, longitude, and altitude
- Receiver velocity
- Time
- DOP error-magnification factor
- GPS signal tracking status
The SiRF Star III-USB will perform 3D navigation when
four or more satellites are tracked. When three or fewer satellites are
tracked, altitude-hold is enabled using the last computed altitude and
2D navigation mode is entered.
With signal blockage or rising and setting of the
satellites, where a change in satellite constellation used for position
fix occurred, large position error may result. The SiRF Star III-USB
incorporates a proprietary algorithm to compensate the effect of
satellite constellation change, and maintains an accurate smooth
estimate of the receiver position, velocity, and heading. |
