How to achieve sub-meter accuracy in remote locations?

Discussion in 'GPS Technical Discussion' started by Stalemate, Jun 25, 2019.

  1. Stalemate

    Stalemate

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    Activity: Create 3D reconstructions of geological outcrops. Using imagery from a DJI Phantom 4, and SfM-MVS algorithms. To orientate the SfM-MVS reconstruction I will use ground control points (GCPs). I require sub-meter accuracy to measure these GCPs.

    Areas: Remote, places with no mobile or RTK networks. First project will be in southwest Tibet.

    Question 1: Is a SBAS solution the best way to go (I do not need cm accuracy)?

    Question 2: How can I find out the coverage of SBAS, India has GAGAN, does that cover Tibet? China also has SNAS, but is that functional? Where can I confirm the coverage before I find out in the field that I am not within range? Are there commercial SBAS that I can pay for that cover Tibet?

    Question 3: What receiver do I look for? I believe that the Arrow 200 GNSS and the SXblue II+ GNSS receivers will do what I want? The Bad Elf GNSS Surveyor and Juniper Systems Geode are much cheaper, can they also work in Tibet?

    Question 4: Is there a better (cheaper) solution that I am unaware of?

    Question 5: How can I check if there is a RTK network available before I arrive to the field?

    I appreciate any help.
     
    Stalemate, Jun 25, 2019
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  2. Stalemate

    Nuvi-Nebie Moderator

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    I would say that a dual/multi band receiver like the Arrow 200 (L1+L2) or Arrow Gold (L1+L2+L5) will contribute to sub-metre accuracy much more than the ability to receive an SBAS signal on a single band (L1 only) receiver like the SXblue II+

    Dual band (L1+L5) receivers are also built into some smartphones, see link (Click HERE)
     
    Nuvi-Nebie, Jun 25, 2019
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  3. Stalemate

    Stalemate

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    Thanks for the info, the GPSTest is great, amazing to get dual band in phones. Will have to upgrade my s7.
     
    Stalemate, Jun 26, 2019
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