Improvement of angle simulation accuracy of RFSS based on diversity

The technology to improve the angle simulation accuracy of the three-unit-array (TUA) radio-frequency-simulation-system (RFSS) is studied. TUA diversity technology is given through using multiple TUAs to simulate a same target simultaneously. Because the amplitude error is independent among different TUAs, the angle error is independent too. And then the electromagnetic wave (EMW) of these TUAs with different energy flow direction error will superpose together, which is called space combining. The EMW of these TUAs should have proper power weight to get best results. Therefore, the algorithm of max-ratio combining need be adopted. The optimal weight is given in this paper for TUA diversity with space combining. As a result, when five TUAs are used to simulate a point target, the variance of the angle error can be decreased to be less than 60%. The more TUAs are used, the more accurate the angle is. It is helpful in the further improvement of the angle simulation accuracy in the TUA RFSS.