![]() ![]() Assuming you buy two units, one for a base and one for a rover, this setup will cost just over $200 with shipping. I have had good results with this antenna and would recommend it. It does not come with an antenna but CSG also sells a u-blox antenna for an additional $20. It has a USB interface which means it can easily be connected directly to a computer without any kind of adapter. The best source for a M8T based receiver that I am aware of is from CSG Shop for $75. The current firmware supports the GPS and GLONASS satellite systems and newer firmware should be available soon to also support the Galileo system. Unlike the M8N, it is specifically intended to be used for precision positioning and officially supports output of the raw signals. The NEO-M8T is more capable and more expensive than the NEO-M8N. Assuming you plan to use the RTKLIB open-source software to process the raw GPS signals, then you will want to choose between the M8T and the M8N. I have not worked with version and don't know anything about it. The NEO-M8P uses u-blox's own integerated RTK (real-time kinematics) solution and is significantly more expensive than the other two. ![]() There are three basic versions of the chip, the NEO-M8N, the NEO-M8T, and the NEO-M8P. The NEO-M8 series is the latest generation from Ublox. Also I was able to find examples of other people successfully using them with RTKLIB, including Tomoji Takasu, the author of RTKLIB (see here). I chose the u-blox receivers because they seem to be the most available and lowest cost option out there. There are only a few low cost GPS chips that provide these signals. The first thing you will need to begin your journey into low-cost precision GPS is a receiver that provides access to the raw GPS position signals pseudorange and carrier phase. ![]()
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