SLIDE 9 BEAMED RF POWER TECHNOLOGY BEAM FORMING ARRAY PATTERNS A CONCEPT DRAWING FOR THE PI LOT-BEAM-STEERED, RETRODIRECTIVE ARRAY CURRENTLY UNDER CONSTRUCTION AT JPL IS SHOWN. BEAM POINTING ACCURACY AND OTHER ARRAY PERFORMANCE CHARACTERISTICS AS A FUNCTION OF VARIOUS PARAMETERS SUCH AS PILOT SIGNAL-TO-NOISE RATIO AND INTERCONNECTING CABLE LENGTHS WILL BE MEASURED. BEAM FORMING PRECISION AND SIDELOBE LEVELS WILL BE DETERMINED ALONG WITH MEASUREMENT OF THE PHASE REFERENCE DISTRIBUTION AND PHASE CONJUGATION PERFORMANCE. EACH SUBARRAY RECEIVER-TRANSMITTER UNIT WILL EMPLOY A 64-SLOT WAVEGUIDE SUBARRAY ANTENNA DIPLEXED TO BOTH RECEIVE THE PILOT SIGNALS AND TO TRANSMIT A LOW POWER SIGNAL REPRESENTING THE POWER BEAM. AN ANECHOIC CHAMBER ANTENNA RANGE IS USED TO MINIMIZE MULTIPATH REFLECTIONS AND TO REDUCE ENVIRONMENTAL PROTECTION COSTS FOR THE EQUIPMENT IN THESE VERIFICATI ON TESTS.
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