Disclosed is a frequency multiplication apparatus including a first frequency multiplier receiving a first signal having a first frequency and outputting a second signal having a second frequency by multiplying the first frequency by ‘n’ (‘n’ being a positive integer), a second frequency multiplier receiving the second signal and outputting a third signal having a third frequency by multiplying the second frequency by ‘m’ (‘m’ being a positive integer), and a coupler connected between an output of the first frequency multiplier and an input of the second frequency multiplier and outputting a part of the second signal.

Disclosed is a frequency multiplication apparatus including a first frequency multiplier receiving a first signal having a first frequency and outputting a second signal having a second frequency by multiplying the first frequency by n (n being a positive integer), a second frequency multiplier receiving the second signal and outputting a third signal having a third frequency by multiplying the second frequency by m (m being a positive integer), and a coupler connected between an output of the first frequency multiplier and an input of the second frequency multiplier and outputting a part of the second signal.

Disclosed is a frequency multiplication apparatus including a first frequency multiplier receiving a first signal having a first frequency and outputting a second signal having a second frequency by multiplying the first frequency by n (n being a positive integer), a second frequency multiplier receiving the second signal and outputting a third signal having a third frequency by multiplying the second frequency by m (m being a positive integer), and a coupler connected between an output of the first frequency multiplier and an input of the second frequency multiplier and outputting a part of the second signal.

A method for timing aperture synthesis arrays comprising the steps of: (a) coupling a plurality of independent crystal oscillators, each of the plurality of independent crystal oscillators having a unique output frequency; (b) digitally synchronizing the plurality of independent crystal oscillators in phase; (c) combining the unique output frequencies; and (d) obtaining a stable digital reference signal for timing at least one remote radio device of the aperture synthesis array.

A method for timing aperture synthesis arrays comprising the steps of: (a) coupling a plurality of independent crystal oscillators, each of the plurality of independent crystal oscillators having a unique output frequency; (b) digitally synchronizing the plurality of independent crystal oscillators in phase; (c) combining the unique output frequencies; and (d) obtaining a stable digital reference signal for timing at least one remote radio device of the aperture synthesis array.

A method for timing aperture synthesis arrays comprising the steps of: (a) coupling a plurality of independent crystal oscillators, each of the plurality of independent crystal oscillators having a unique output frequency; (b) digitally synchronizing the plurality of independent crystal oscillators in phase; (c) combining the unique output frequencies; and (d) obtaining a stable digital reference signal for timing at least one remote radio device of the aperture synthesis array.