The problem is that it is impossible to fix an onboard antenna to receive the electromagnetic disturbances due to the vehicle under test only in all frequency ranges. Such antenna would receive a lot of radiated disturbances from another interfering sources like: other vehicles, WiFi, HiFi, GPS, Bluetooth, Television, Radio, Mobile, Satellite, power lines …etc.
Realmente no me he topado con esa necesidad, pero algunas cosas que tal ves podrían intentarse son: Realizar las medidas dentro de una cámara semianecoica de al menos 10 m destinada a ensayos de EMC para vehículos, utilizando algún tipo de banco de pruebas especial que permita colocar el vehículo en sus condiciones normales de funcionamiento, incluyendo el simulacro de su aceleración y utilizar antenas y/o sondas específicos de banda ancha, en los lugares de interés del vehículo que desees monitorear. Tal vez, un análisis en el dominio del tiempo sea mas adecuado, pero realmente no te puedo dar certeza sobre el tema. Suerte!
Thanks Marco for your reply. The problem of using a semi-anechoic chamber provided with a chassis dynamometer is that this type of equipment has its own radiated emissions that will of course interfere with the EMI disturbances due to the vehicle. For more information about this point, I recommend this article: Silva, F.; Aragon, M.; , "Electromagnetic interferences from electric/hybrid vehicles," General Assembly and Scientific Symposium, 2011 XXXth URSI , vol., no., pp.1-4, 13-20 Aug. 2011
Good luck.
To my knowledge the only method for discriminating the car's own emissions would be "synchronizing" the receiver with the source, something perhaps possible with the ignition but hard to imagine being really effective with other more complex sources. Waterfall analysis could help in finding correlations for some amount, but I'm doubtful that in the real world of city streets and motorways one would record only a big mess of RF noises. On the other way round, waterfall analysis could help in discriminating the noise generated by chassis dynamometer etc. in a chamber. Regards
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