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PDF GNS603 Data sheet ( Hoja de datos )
| Número de pieza | GNS603 | |
| Descripción | GPS receiver | |
| Fabricantes | GNS | |
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GPS receiver
GNS 603
Datasheet V1.0
preliminary specification
1 INTRODUCTION
GNS603 is a small autonomous GPS receiver, based upon the MT3339 single chip, available with a
finely tuned, high-sensitivity patch ceramic antenna.
The navigation performance and accuracy is further improved by using correction data from SBAS
(WAAS, EGNOS, GAGAN, MSAS, QZSS).
The GNS603 provides a extra embedded functionality for connection of an external active GPS
antenna. An automatic antenna switching function and a short circuit protection features a software
antenna status message called “Antenna Advisor”. The “Antenna Advisor” helps to indicate the
different states, including active antenna connection, antenna open circuit detection and antenna
shortage.
First Fixes after just a few seconds are achieved with the help of A-GPS using EPOTM ( Extended
Prediction Orbit) and the EASYTM “self generated orbit prediction” algorithm. EASYTM (Embedded
Assist System) does not require any resources or assist data from the host.
The excellent low power design makes it easy to implement this receiver in power sensitive, battery
supplied applications. The new AlwaysLocateTM power management feature will improve this
behaviour additionally. It adaptively adjusts power consumption depending on the environment and
motion conditions, in order to achive a balance between fix rate, power consumption and position
accuracy.
Very low power requirements (typ 66mW@ 3.3V) and internal voltage regulator makes it easy to
run the receiver with various power supplies and allows direct connection to LiIon batteries.
GNS603 offers the industry’s highest level of navigation sensitivity up to -165dBm1. It has superior
dynamic performance at high velocity and provides effective protection against interference signals
using MTAICTM ( Multi-tone active interference canceller). Up to 12 independent channel
interference continious wave jammers <-80dBm can be eliminated or reduced.
The embedded logger function LOCUS with a 16-hrs on chip memory makes this GPS module a
complete track logger for many applications. With AlwaysLocateTM data logging can be achieved up
to 32-hrs under standard conditions.
In professional timing applications the outstanding high accuracy PPS (pulse per second) hardware
pin is used for synchronization to GPS second. Typical accuracy is 10ns.
1 note: Based on chip specifications
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© GNS-GmbH 2013
V 1.0, May 24th 2013
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1 page  
GPS receiver
GNS 603
Datasheet V1.0
preliminary specification
3.3 AGPS with EPO data
AGPS (assisted GPS) allows to shorten TTFF (TimeToFirstFix) by injecting ephemeris data from an
external source into the module’s memory. With the help of these data, the module does not need
to acquire satellite positions by receiving the data from the satellites.
Depending on time and position information, that is still available in the module memory, the TTFF
can be reduced to just a few seconds.
The GNS AGPS service is based on a short term predicted data service. The predicted data will be
fully processed by the GPS engine. The host must load the data from the web and transfer them
over the UART into the module:
1. Check GNS603 module EPO (Extended Prediction Orbit) data for validity by comparing the
time.
2. Connect to web server through network connection (GPRS, WLAN, LAN,..).
3. Download file. There are just two files, covering all GPS satellites. The first file (MTK7d.EPO)
is for 7 days (53kB), the other is 106Kbytes for 14 days (MTK14d.EPO)
4. “Parse” file, using software example. This is quite easy, there must be added some header
bytes and a checksum and a control counter. GNS offers software support on this.
5. Download to GNS603 receiver. Please refer to the NMEAcommandInterface manual for
details.
If the host has low memory available, there’s no need to save the whole file. The steps 3..5 can be
done frame by frame needing less than 2kBytes of buffer memory.
Code samples and support for several platforms are available from GNS (in preparation).
Thanks to the predicted system, download data stay valid for up to 14 days. Therefore, users can
initiate the download everytime and benefit from using (W)LAN instead of using expensive GSM.
File size will be ~50kBytes for a one week prediction data set.
System
File size for data download
Maximum prediction time
TTFF
TTFF
7
AGPS characteristics
53 kB
14 days
1 sec
15 sec
6hrs predicted data
1 week prediction data
Time and last position available
Last position available
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5 Page 
GPS receiver
GNS 603
Datasheet V1.0
preliminary specification
3.14 Geofencing function
GNS603 has an internal algorithm to determine whether the actual position is within a circular area
around a predefined location point. A proprietary sentence indicates the “inside” or “outside” status.
Need of firmware customization.
3.15 Magnetic variation feature
As the magnetic variation feature is enabled, data output provides informations about the degree of
magnetic variation and the measured magnetic heading. Need of firmware customization.
3.16 Distance calculation feature
This feature allows to request the real “line of sight” distance in relation to a predefined position.
This feature can remove some load from the host processor. Need of firmware customization.
3.17 GPS almanac and ephemeris data
For quick re-acquisition of the GPS after off-times, the GPS engine should have access to almanac
and ephemeris data. This data is permanently stored inside GNS603 module, even if all power
supplies have been removed. When the GPS is powered-up again, the data will be used to allow a
quick re-acquisition, as soon as a coarse time information is available. Time will be available
immediately, when RTC is kept running.
3.18 Real time clock (RTC)
GNS603 has a real time clock with 32,768Hz crystal onboard. As long as VBACKUP is connected to
a power source, the real time clock and the module memory can be kept alive at very low power
consumption of just 7uA. The RTC will track the current time and enable the module to start from
sleep states with very fast time to first Fix (TTFF).
3.19 UART interface
GNS603 core and I/O sections work at 3.3V nominal. Absolute Maximum Ratings should not be
exceeded. Should the GNS603 be interfaced to a host with I/O at higher/lower levels, level shifters
should be used. UART baud rate is 9600baud by default. The baud rate can be modified to higher
rates by a NMEA software command. See document NMEAcommandInterface manual for details.
Parameter
Baud rate
Data length
Stop bit
Parity
GPS UART Default Settings
Value
9600
8 bits
1
None
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© GNS-GmbH 2013
V 1.0, May 24th 2013
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