ULRS can replace one of the 16 servos values by a servo value representing the RSSI. If using a recent flight controller such as Pixhawk, it’s strongly recommended to use the RSSI as servo signal. The RSSI is available either as a PWM signal (can be considered as analog signal when filtered), or as a servo signal. You can use the ULRS range estimator to extrapolate your RSSI at any distance and find out the maximum range. At the limit we could do this measurement at 1m distance and extrapolate but in practice it’s more precise to take a measurement at a larger distance such as 1km. So if we know the RSSI at any distance, we can extrapolate to the value for any distance, and even find the maximum range for given antennas. This isn’t linear with the distance, for every 6 dB difference, the distance is doubled.įor example if we have -50 dBm at 1km, we will haveĪnd when we are at -103 dBm we’re at the maximum distance. It’s also important to understand that the RSSI isn’t a linear value : for example a RSSI of 50% doesn’t mean that we are at half the maximum distance. It’s an important value to monitor during the flight. It’s useful to keep an eye on it, as it allows to know when we approach the maximum distance of the system. The RSSI is the Received Signal Strength Indicator, and is an indication of the signal level.
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