Piksi a single-frequency GPS/GNSS receiver. It delivers RTK functionality for centimeter-level relative positioning in a 53x53mm form factor. The Piksi receiver supports a high-performance, onboard Digital Signal Processor (DSP) and a flexible correlation accelerator.

Features
   Centimeter-level relative positioning (RTK)
   10 Hz position/velocity/time solutions for fast updates
   Open-source software and board design (the FPGA firmware is closed source)
   Low power consumption: 500mW typical
   Small form factor:    53x53mm
   USB and dual UART connectivity
   Full-rate raw sample pass-through over USB
   3-bit, 16.368 MS/s L1 front-end supports GPS and SBAS signals