I'd like to test GPS Antenna performance, but I don't have access to any expensive RF equipment. What is the best way to evaluate GPS antenna performance by using only standard NMEA sentence type data? The Sirf and U-blox based receivers I am using allows me to enable almost any standard NMEA sentence.
One crude way of testing an antenna is seeing if it actually gets a lock -- however, that's the most basic test. I'd like to evaluate further.
Some ideas that I have:
- Measuring number of satellites it can lock to
- Looking at all the signal strengths of all satellites
- Adding up all signal strengths of all satellites that it can lock to.
- Look at the HDOP and VDOP values -- however, perhaps this is not helpful or meaningful as this only depends on the geometry of the locked satellites.