Frequency-hopping spread spectrum (FHSS) is a method of transmitting radio signals by rapidly switching a carrier frequency among many frequency channels, using a pseudorandom sequence known to both transmitter and receiver. This type of spread spectrum technology is typically used to improve the resistance of communications systems to external interference and jamming.
FHSS is used in a variety of wireless communications systems, including cell phones, wireless local area networks (WLANs), and wireless personal area networks (WPANs). In the case of drones, FHSS can be used in the transmitter to improve the reliability and security of the communication link between the drone and its remote control or ground station.
One of the key advantages of FHSS is its ability to resist interference from other radio sources, such as other drones or nearby wireless networks. By rapidly switching frequencies, FHSS can avoid interference from other signals and maintain a stable communication link.
Another advantage of FHSS is its security. Because the pseudorandom sequence used to hop between frequencies is known only to the transmitter and receiver, it is difficult for an unauthorized third party to intercept or jam the signal.
In addition to its resistance to interference and improved security, FHSS can also provide a higher data rate than other spread spectrum techniques, such as direct-sequence spread spectrum (DSSS). This makes it well suited for applications such as video transmission from a drone.
In conclusion, FHSS is a valuable tool for improving the reliability and security of communications systems, especially in the case of drones. By rapidly switching frequencies and using a pseudorandom sequence known only to the transmitter and receiver, FHSS can resist interference and provide a high data rate for video transmission.