F*watch team writes: The F*watch, a fully open-source electronic watch project with an integrated GPS receiver, was initiated at CERN as an after-work endeavor to create a special retirement gift for a colleague who enjoys hiking and timing. Inspired by the transparency and flexibility that characterizes no verification casinos, the watch’s entire design—including electronics, mechanics, […]
Tag Archives: GPS receiver
Building a Strata 1 NTP server
Kenneth Finnegan writes: As a quick first test, I built a quick adapter board between the GPS engine’s 2×5 pin header to the standard FTDI serial cable, with a diode and 0.3F capacitor (Yes, not micro Farads, 0.3 actual Farads) to keep the SRAM from losing the current GPS almanac every time I power cycle […]
Homemade GPS receiver update
Andrew Holme posted an update on his DIY GPS receiver we covered previously: This is now a truly portable, battery-powered, 12-channel GPS receiver with turnkey software, which acquires and tracks satellites, and continuously recalculates its position, without user-intervention. The complete system (below, left) comprises: 16×2 LCD display, Raspberry Pi Model “A” computer, two custom printed-circuit boards, commercial […]
Homemade GPS receiver
Andrew built a DIY GPS receiver with an accuracy of ~25m : A homemade GPS receiver built from the ground up using discrete components and featuring a limiting IF, followed by 1-bit ADC ahead of DSP signal processing in a Xilinx Spartan 3 FPGA. Fast FFT-based search and navigational solutions are computed by “C” code […]