Micro-Transcoder
Retrofit any GPS system with Assured-PNT
- Embedded NMEA encoding to GPS L1 RF
- Upgrade Legacy GPS systems to INS, SAASM, M-Code, Concurrent GNSS
- Can work as a GPS firewall system to harden against spoofing and jamming
- 0.97 x 0.97 x 0.4 inches small, 0.95W
- Also works as a Low Cost General Purpose GPS Simulator
- Leapsecond and Week Number Roll Over testing of customers' GPS receivers
- 5ns timing, and 1m positioning accuracy typ.
The tiny 1-inch square Micro-Transcoder™ module allows glue-less retrofitting of existing GPS equipment by upgrading the customers’ GPS systems with secure and assured PNT capability. The Micro-Transcoder™ is by a large margin the world’s smallest, full-constellation, stand-alone, real-time 10-channel GPS simulator.
The Micro-Transcoder™ achieves hardening of the customers’ GPS equipment by splicing the unit in-between the existing antenna and the users’ GPS receiver, and taking the output of any secure PNT source such as INS, SAASM, M-code, or concurrent GNSS receiver and encoding (RF modulating) the baseband PNT and UTC timing information into a standard GPS L1 RF signal. This RF signal can then be received by any legacy GPS receiver. The unit can act as a GPS Firewall to identify and block jamming and spoofing attempts, and to provide an alternate PNT source during fully GPS-denied operation.
The unit is based on the popular JLT CLAW GPS Simulator and RSR Transcoder™ technologies, and includes a stand-alone full-constellation 10-channels real-time GPS simulator with integrated high-stability timing reference, as well as an internal GNSS receiver for monitoring the RF output signal for quality and accuracy. The unit will transmit a standard UTC time, position, velocity, and heading GPS L1 RF signal by simply applying 3.3V power to it.
The Micro-Transcoder™ can also be operated as a generic high-performance GPS simulator with built-in GPS Disciplined Oscillator (GPSDO), and is supported by a comprehensive free Windows application program downloadable from the JLT website. The Windows application allows control of all the simulation aspects, creating and storing simulation vector commands, and testing user equipment for leap-second and GPS week rollover event compatibility to identify weaknesses in user equipment. The unit does not require a PC to be connected to it to function. This makes embedded operation as easy as applying power, and connecting the units’ RF output to the antenna input of any GPS receiver.
The Micro-Transcoder™ receives baseband NMEA or SCPI PNT information alongside external 1PPS timing pulses through its two serial and 1PPS ports, and can be directly connected to external GNSS, or INS PNT sources via the serial port. The unit then transcodes these baseband PNT signals into a GPS L1 RF signal with typically less than 100ms latency. UTC 1PPS timing-transfer accuracy is typically better than 5ns. The unit requires only 3.3V to operate, and setup and location information can optionally be stored in internal NV memory.
