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GNS702 데이터시트 PDF




GNS에서 제조한 전자 부품 GNS702은 전자 산업 및 응용 분야에서
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부품번호 GNS702 기능
기능 GPS/GLONASS receiver
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GNS702 데이터시트, 핀배열, 회로
GPS/GLONASS receiver
GNS702
Datasheet V1.2
preliminary specification
1 INTRODUCTION
GNS702 is a small autonomous GPS/GLONASS receiver, based upon the MediaTek MT3333 single
chip, available with a finely tuned, high-sensitivity ceramic chip antenna. The receiver supports GPS
and GLONASS simultaneously.
The navigation performance and accuracy is further improved by using correction data from SBAS
(WAAS, EGNOS, GAGAN, MSAS), QZSS.
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 93mW@ 3.3V, tracking for GPS+GLONASS) and internal voltage
regulator makes it easy to run the receiver with various power supplies and allows direct connection
to LiIon batteries.
GNS702 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
© GNS-GmbH 2013
V 1.2, Apr 5th 2013
1




GNS702 pdf, 반도체, 판매, 대치품
GPS/GLONASS receiver
Datasheet V1.2
GNS702
preliminary specification
3 FUNCTIONAL DESCRIPTION
3.1 System description
The GNS702 is a high performance, low power GPS/GLONASS receiver that includes an integrated
RF frontend (SAW Filter + LNA) and a finely tuned 5.2x3.7x0.7mm ceramic chip antenna.
Due to high input sensitivity and integrated low noise amplifier (LNA), it can work at weak
GPS/GLONASS signals.
GNS702 is a complete autonomous GPS/GLONASS receiver, including:
- Full GPS/GLONASS processing, without any host processing requirements
- Standard NMEA message output
- A powerful NMEA command and control interface
- All clock sources integrated
- RF frontend integrates a low noise amplifier (LNA) and a SAW filter
- Rich additional features like geofencing, single sentence output, last position retention,
magnetic variation, distance calculation
- Interface for UART, PPS output pin, Fix Status Indicator pin
3.2 Block diagram
GPS/GLONASS
chip antenna
SAW filter
+Low Noise
Amplifier
VCC 1
VBACKUP 4
5 3D-Fix
6 1PPS
GPS
/GLONASS
chip
9 TX
10 RX
32.768kHz
crystal
16.368MHz
TCXO
GND
3,8,11,12
© GNS-GmbH 2013
V 1.2, Apr 5th 2013
4

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GNS702 전자부품, 판매, 대치품
GPS/GLONASS receiver
GNS702
Datasheet V1.2
preliminary specification
3.5 Logger function
GNS702 provides an autonomous logger function that automatically stores position information in
an internal 128kB flash memory. A complete tracking unit can be realized without any external CPU
or memory.
The parameters for logging are programmable via the NMEA command interface. The following
parameter can be set to optimize logging time:
- logger rate
The commands for logger include:
- start logging
- stop logging
- erase memory
- readout memory
please refer to the GPS/GLONASS_NMEAcommandInterface manual for details.
Logger data rate
Logger data memory
Logger trigger
1/15
Internal Logger Function
1 1/s
128 kBytes
programm
able
Flash memory
Logger can be triggered on
various events
3.6 Active interference cancellation (MTAIC)
Because different wireless technologies like Wi-Fi, GSM/GPRS, 3G/4G, Bluetooth are integrated into
portable systems, the harmonic of RF signals may influence the GPS reception.
The multi-tone active interference canceller can reject external RF interference which come from
other active components on the main board, thus improving the performance of GPS reception.
GNS702 can cancel up to 12 independent continuous wave (CW) channels having signal levels of up
to -80dBm. The functionality is enabled by default and increases power consumption by about 1mA.
3.7 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 GNS702 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)
© GNS-GmbH 2013
V 1.2, Apr 5th 2013
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GPS/GLONASS receiver

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