? RSSI signal wireless communication ranging principle

RSSI signal (Received Signal Strength Indication)——The received data signal strength indication, as an optional part in the wireless data transmission layer, is used to determine whether the quality of the transmission link is reliable and whether to increase the strength of broadcast data transmission. RSSI technology is to determine the distance between the signal sending point and the receiving point by the strength of the received data signal. The data obtained by the receiver measurement circuit is the average signal strength indication of the received input, and the positioning calculation is performed according to these corresponding data. technology (this measurement generally excludes antenna gain and transmission system losses). RSSI signal strength How does RSSI make distance measurements? RSSI is a theoretical term for radio frequency signals, Lora Wireless Modules and is generally mainly used for distance measurement between a data sending station and a receiving station. It is a method of measuring the distance according to the received signal energy strength, which requires relatively high parameters of the transmission channel. Ranging theory: According to the influence of the propagation efficiency of radio waves and sound waves in the medium, the transmission power of the signal will be attenuated due to the distance. The distance between the transmitting node and the receiving node can be calculated by the known power of the transmitting node and the receiving node of the existing signal target node, combined with the attenuation model between the signal and the distance. In the process of signal propagation, it may be indirectly affected by the transmission distance and shielding objects, which will affect the accuracy of the measurement to a certain extent. Therefore, if you want to pursue high-precision signals, short distances are a better choice. .