Secure Class A AIS Transponder

Secure Communication over AIS Network

i-ais-STA AIS Transponder is a Class-A AIS mobile device, which provides secure communication functionality in addition to the standard AIS features.

i-ais-STA has three operating modes:

Active: Standard AIS mode (acts as a standard Class-A Transponder)

Passive: Receive only mode (only listens, without any transmission)

Protected: Secure mode (encrypts transmitted AIS data)


The secure mode of the i-ais-STA is provided with well known AES encryption algorithm.

The key for AES is loaded to the device with a special SW over serial communication channel.

  • Operating modes (Active / Passive / Protected)
  • 8 x RS-422 ports (IEC61162-2 comp.)
  • Robust housing (IP66)
  • Fully compliant with IEC and ITU standards
  • RTCA/DO-160E compatibility
  • Compatible with i-SEA Platform

General Specifications

Operating Temperature Range -15 C to +55 C
Storage Temperature Range -30 C to +70 C
Humidity Up to 93% at 40 C non-condensing
Power Supply Voltage 12 / 24 V DC (max 10V – 30V DC)
Power Consumption 500mA nominal @ 12 V DC
Size 200 mm x 220 mm x 140 mm
Weight < 4.4 kg
Connectors VHF Antenna: N Female
GPS Antenna: TNC Female
Data Connector: MIL-DTL-38999 comp.
Power Connector: MIL-DTL-38999 comp.

Transmitter Specifications

Operating Frequency Range  156.025 – 162.025 MHz (VHF-P frequencies are also supported)
Channel Spacing 25 kHz
Transmitter Output Power 12.5W (41dBm) nominal
1W (30dBm) low power mode
Modulation GMSK

Receiver Specifications

# of Receivers 2 x AIS
1 x AIS & DSC
Operating Frequency Range 156.025 – 162.025 MHz (VHF-P frequencies are also supported)
Channel Spacing 25 kHz
Receiver Sensitivity Better than -107dBm
Co-Channel Rejection Better than 10 dB
Adjacent Channel Selectivity > 70 dB
Spurious Response Rejection > 70 dB
Intermodulation Response Rejection > 86 dB
Blocking or Desensitization > 86 dB
Spurious Radiation (conducted) < -57 dBm


Sensor Input 8 x RS-422 (IEC61162-2 compatible / can be configured as complies with IEC61162-1 as well)
Other Alarm Output

Pre Pulse Output

User Manual
Data Sheet