From Longman Dictionary of Contemporary Englishlock onto something phrasal verbPMWif a missile or satellite locks onto a target or signal, it finds it and follows it closely → lock→ See Verb table
Examples from the Corpus
lock onto • But the Monster's eyes are locked on to mine.• He either locks on to whatever brand he began with, or he stops purchasing altogether.• It seemed to be locked on to some invisible beam that was projecting from out of June's vagina.• Managing change: Today, however, almost every guru is locked on to the theme of change management.• Often the tab can be locked on to a device at the center of the lid.• Rather, it locks on to the injection only when the injection coincides with the start of the active period.• Starlings, which are active during the day, lock on to melatonin when it coincides with the end of their activity.• This can lock on to a target and stay there. 