A method of detecting motion in components that form part of a structure. The method includes flooding a first component with transmitted radio frequency signals and receiving reflected radio frequency signals from the first component with an antenna. The method further includes generating a first set of intermediate frequency signals based on differences between the transmitted radio frequency signals and the reflected radio frequency signals and measuring the first set of intermediate frequency signals. The method further includes flooding a second component with transmitted radio frequency signals and receiving reflected radio frequency signals from the second component with an antenna. The method further includes generating a second set of intermediate frequency signals based on differences between the transmitted radio frequency signals and the additional reflected radio frequency signals and measuring the second set of intermediate frequency.