Homemade GPS receiver

in DIY by DP | 6 comments

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 on a Windows PC

He provided the FPGA Verilog source code, as well as lots of links for anyone interested in this subject.

Via the forum.

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Comments

  1. Tiersten says:

    Wow. This is impressive. It also goes to show how much is packed into those tiny cheap GPS modules you can purchase now.

  2. Joe Desbonnet says:

    Many decades ago (early 1990s) I came across an amazing series of articles in an electronics/ham radio magazine on making your own GPS receiver. This was well before consumer units were on the market. It explained the theory behind the system very well too. I can’t remember what the magazine was. It’s probably still worth reading those articles today. Some quick google searches throws up too much noise. Anyone know that magazine that was? (it may have been an UK/Ireland only publication).

    • Nick says:

      It would have to have been Elektor, Practical Electronics, Practical Wireless or Everyday Electronics, or maybe Wireless World, I think that they were all that was left on the news stands by then, Short Wave Magazine and ETI has long since disappeared, and all the others were too light-weight.

      I’d be inclined to think that it would have had to have been Wireless World or Elektor just because they both ran uncompromisingly large and complex projects in those days ….

    • Andrew says:

      Matjaz Vidmar: “A DIY Receiver for GPS and GLONASS Satellites, Part-1″, pages 35-44/1-94, VHF-Communications.
      Matjaz Vidmar: “A DIY Receiver for GPS and GLONASS Satellites, Part-2″, pages 66-77/2-94, VHF-Communications.
      Matjaz Vidmar: “A DIY Receiver for GPS and GLONASS Satellites, Part-3″, pages 151-165/3-94, VHF-Communications.
      Matjaz Vidmar: “A DIY Receiver for GPS and GLONASS Satellites, Part-3b, Quadrifilar Backfire Helix Antenna”, pages 197-200/4-94, VHF-Communicatoins.
      Matjaz Vidmar: “A DIY Receiver for GPS and GLONASS Satellites, Part-4″, pages 35-51/1-95, VHF-Communications.
      Matjaz Vidmar: “A DIY Receiver for GPS and GLONASS Satellites, Part-5″, pages 78-90/2-95, VHF-Communications.
      Matjaz Vidmar: “A DIY Receiver for GPS and GLONASS Satellites, Part-6″, pages 153-167/3-95, VHF-Communications.

  3. Arthur Benemann says:

    Cool project, awesome documentation !

  4. Joe Desbonnet says:

    Yes, I’m pretty sure that was it… VHF Communications 1994/1995. I remember being blown away by that series of articles. It brought home that stuff that was seemingly only in the domain of big-budget military contractors was achievable by hams/hobbyists with the right amount of perseverance and ingenuity.

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