time reference scanning beam
Also found in: Acronyms.
time reference scanning beam[′tīm ‚ref·rəns ′skan·iŋ ‚bēm]
A radio or radar beam which is swept to and fro over a sector of space and in such a manner that the interval between reception of successive pulses at an aircraft indicates the aircraft's altitude or azimuth.
A system of ground equipment that generates such beams at microwave frequencies to furnish guidance to aircraft making microwave landings. Abbreviated TRSB.