Why test GNSS receivers for EMC?
Although there is no specific product standard for EMC in GNSS receivers, testing for immunity to electromagnetic interference has to be an essential part of the product development process.
Any receiver designed for low-level signals will inevitably be susceptible to electromagnetic interference. And GNSS receivers inevitably are required to operate reliably in areas where they will be subject to any number of sources of interference. These range from natural phenomena such as solar radio bursts to man-made sources such as broadcast transmitters and electrical noise from all manner of electromechanical machinery and even power lines and the like.
Add to these the specific problems of certain application areas, such as vehicle ignition systems interfering with automotive sat nav or telemetry systems, and the operating environment for a GNSS receiver could scarcely be more hostile.
In addition, with many GNSS receivers integrated into larger pieces of equipment, the scope for electromagnetic interference is even greater. Earth loops, oscillators operating in close proximity to each other and intentional emitters sitting on a common PCB with the receiver add to the potential for problems.
So while EMC testing of GNSS receivers may not be a mandatory requirement, it is an essential part of the quality control process to ensure that the receivers will provide reliable accurate outputs.
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