Cancellation of interference and harmonics

A method for mitigating interference from an interference signal, the method comprising cancellation circuitry:

• receiving a first signal from a first antenna, the first signal comprising an interference component deriving from the interference signal and a desired component deriving from a desired signal;
• receiving a second signal comprising an interference component deriving from the interference signal and received at one or more of a different antenna or a different frequency to the first signal, wherein the interference component in the second signal is stronger than the interference component in the first signal;
• deriving a cancellation signal from the second signal;
• generating an output signal by subtracting the cancellation signal from the input signal to substantially remove the interference component from the first signal;
• and
• outputting the output signal,
• wherein:
• the interference signal is a pulsed interference signal comprising a series of pulses of interference;
• the method further comprises detecting when a pulse of interference is received;
• and
• the cancellation circuitry subtracts the cancellation signal from the input signal only during each pulse.

A system for mitigating interference from an interference signal, wherein the system comprises cancellation circuitry configured to:

• receive a first signal from a first antenna, the first signal comprising an interference component deriving from the interference signal and a desired component deriving from a desired signal;
• receive a second signal comprising an interference component deriving from the interference signal and received at one or more of a different antenna or a different frequency to the first signal, wherein the interference component in the second signal is stronger than the interference component in the first signal;
• derive a cancellation signal from the second signal;
• generate an output signal by subtracting the cancellation signal from the first signal to substantially remove the interference component from the first signal;
• and
• output the output signal,
• wherein the first signal is obtained via a first antenna element of the first antenna, the second signal is obtained via a first antenna element of a second antenna, wherein each of the first and second antennas comprises a plurality of antenna elements, and wherein the first antenna element of the first antenna has the same polarisation as the first antenna element of the second antenna,
• wherein the cancellation circuitry is further configured to, for each antenna element in the first antenna:
• receive, from the respective antenna element in the first antenna, a corresponding signal comprising an interference component deriving from the interference signal and a desired component deriving from a corresponding desired signal;
• receive, from each antenna element in the second antenna that shares the same polarisation as the respective antenna element of the first antenna, a respective signal comprising an interference component deriving from the interference signal;
• derive a corresponding cancellation signal for the respective antenna of the first antenna based on the respective signal from each antenna element in the second antenna that shares the same polarisation as the respective antenna element of the first antenna;
• generate a corresponding output signal by subtracting the corresponding cancellation signal from the corresponding signal to substantially remove the interference component from the corresponding signal;
• and
• output the corresponding output signal.