Methods, systems, computer-readable media, and apparatuses for locally generating and synchronizing oscillation signals in a phased array system are presented. Multiple sub-array modules are used for collectively transmitting any number of beams on carrier frequencies, wherein each of the sub-array modules includes a transmit antenna, an oscillator configured to generate an oscillation signal, and a control element configured to phase lock the oscillation signal with other oscillation signals used in the system. The control element determines a phase difference measure that represents an average difference in phase between the oscillation signal and other oscillation signals used in the system, generates an average error signal, wherein the average error signal represents the phase difference measure, obtains information regarding oscillator trim signals applied with respect to the other oscillation signals generated in the system, and adjusts a frequency of the oscillation signal using the generated local oscillator trim signal.