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Satellite Trackers


Satellite-GSM Hybrid Tracking Unit (Junction Box)

The ST680 (i.e. Junction Box) functions as a continuous remote management device of fixed and mobile assets anywhere across the world. The ST680 communicates with its server via the GSM/GPRS network or using a satellite modem when the GSM/GPRS network is not available.

The ST680 unit stays in active GSM/GPRS communication when it is in range of cellular coverage. Satellite communication with its server is automatically activated whenever the ST680 unit is not in range of GSM/GPRS coverage.

Once an asset (e.g. boat, vessel, vehicle, etc.) is equipped with the ST680 Satellite-GSM hybrid tracking unit, users can monitor and manage the asset using messages and location data provided by the “JunctionBox-Satellite Modem” integrated system covering all terrestrial and aquatic areas (e.g. oceans, lakes, remote mining sites) of the world.

The ST680 dual communication function is shown below.

Figure 1. Communication flow when GSM/GPRS network is available for ST680

Figure 2. Communication flow when GSM/GPRS network is not available for ST680

The ST680 components and satellite modem are shown in the picture below.

Key Features

  • Continuous real-time tracking in areas without cellular coverage
  • Lower communication costs compared to using only satellite transmission
  • An ideal hybrid (Satellite-GSM) tracker for boats (at sea, lakes) and mining / construction sites

Satellite Modem

  • Satellite Modem: to be integrated by Suntech upon request of client
st680 Satellite Modem pic
Receiver Type 56 channel
Galileo* E1B/L1, Compass* ready
Update Rate 10Hz
Accuracy *1) Position 2.5m CEP
Acquisition *2) Cold starts 29s
12s (Assist Autonomous)
Aided start < 1s
Hot start < 1s
Sensitivity *3) Tracking -162dBm
Reacquisition -160dBm
Cold start -148dBm
  • * 1) All SV @ –130 dBm
  • * 2) It depends on aiding data connection speed and latency.
  • * 3) It was demonstrated with a good active antenna.
GSM/GPRS Specifications
Frequency & Sensitivity GSM 850 / 900MHz -104dBm
DCS1800 / PCS1900Mhz -102dBm
GPRS Multi-slot Class 12
Support all 4 coding schemes (CS-1, CS-2, CS-3 and CS-4)
Technical Specifications
Housing Dimensions 202(W) x 106(L) x 67(T) mm
Weight 950g (w/o cables)
Certificates (GSM/GPRS Modem) CE, FCC, RoHS,
Operating Temperature -30 ~ +80℃
Power Supply DC 8V ~ 33V *Main power +/- inversion protection
Electric Protection Protection against ESD and overvoltage
Back-up Battery Rechargeable 11.4V, Ni-ion 7800mAh
Antenna Type Internal GPS antenna, Internal GPRS antenna
Motion detection Built-in 3-axis accelerometer
Data storage 2000 locations for lost coverage scenario
Communications TCP/UDP
Setting mode by USB cable or GPRS or SMS
Firmware upgradable remotely (OTA: Over-The-Air)
Power consumption Active mode 70~80 mA@12V
Typical (3 min. reporting) 40~50 mA @12V
Event Inputs & outputs 1 Input dedicated for ignition, and,
1 Input for general purposes
1 Output, Open drain output of upto 300mA
for siren, vehicle blocking
1x RS232