METRRA signature: Radar cross section measurements. Instruction manual

The acronym METRRA represents 'Metal R-Radiating Radar'. The METRRA signature tests result from a third harmonic system, since the receive frequency is three times that of the transmit frequency. Of particular significance is METRRA's inherent ability to penetrate foliage. Conventional radar systems provide returns from undesired targets such as trees, water, dense foliage, etc., while the METRRA system does not. The METRRA process is responsive only to man made non linear junctions. Non linear junctions, when radiated by high power RF energy, convert the energy to harmonic frequencies and re-radiating radar.