Hi everyone,
took my child's P2V+ to our EMC lab to see more closely what is going on with this baby. Beyond the issues with the gimbal control loops and auto-tuning algorithm which are leading to occasional jello, we found very serious issues with the PV2+ electronics, namely EMC issues.
RF radiation from the H.264 encoder, which is based on the TI DaVinci chip with external SDRAM memory placed in very poor shielding enclosure causes strong interference with the GPS reception. This interference is so strong, that in the place where 22 satellites are perfectly usable with excellent clean signal providing fast and precise 3D fix with excellent HDOP, PV2+ hardly gets 5 or in best case 6 satellites. Even worse, as soon as you place reference receiver antenna nearby active PV2+, S/N (signal to noise ratio) drops immediately and tracking of weaker satellites is lost immediately.
Implications of this are much more serious: in the situation of any ionospheric or solar winds disturbances, where properly designed system locks easily to enough satellites to get 3D solution, P2V+ loses the fix completely. Any time, without any warning. The situation is probably even worse with PV2, but this one was not tested.
If you had any flyway crashes or GPS was unable to lock sometimes or any similar GPS related issues, call DJI for responsibility now!
DJI shall face these facts, take the responsibility, completely change their engineering procedures and completely redesign their hobby line products in order to remove all these gross negligence engineering faults. I'm curious how well are their much more expensive pro-level products designed. I'm skeptical.
took my child's P2V+ to our EMC lab to see more closely what is going on with this baby. Beyond the issues with the gimbal control loops and auto-tuning algorithm which are leading to occasional jello, we found very serious issues with the PV2+ electronics, namely EMC issues.
RF radiation from the H.264 encoder, which is based on the TI DaVinci chip with external SDRAM memory placed in very poor shielding enclosure causes strong interference with the GPS reception. This interference is so strong, that in the place where 22 satellites are perfectly usable with excellent clean signal providing fast and precise 3D fix with excellent HDOP, PV2+ hardly gets 5 or in best case 6 satellites. Even worse, as soon as you place reference receiver antenna nearby active PV2+, S/N (signal to noise ratio) drops immediately and tracking of weaker satellites is lost immediately.
Implications of this are much more serious: in the situation of any ionospheric or solar winds disturbances, where properly designed system locks easily to enough satellites to get 3D solution, P2V+ loses the fix completely. Any time, without any warning. The situation is probably even worse with PV2, but this one was not tested.
If you had any flyway crashes or GPS was unable to lock sometimes or any similar GPS related issues, call DJI for responsibility now!
DJI shall face these facts, take the responsibility, completely change their engineering procedures and completely redesign their hobby line products in order to remove all these gross negligence engineering faults. I'm curious how well are their much more expensive pro-level products designed. I'm skeptical.