harmonic signals may not be simply a line-of-sight phenomenon but may be propagated over large distances by tropospheric interactions. Effects arising from the reradiation of both fundamental and harmonic frequencies (particularly the second which lies close to the 5 GHz R.A. band) should be investigated as they may represent a significant source of rf interference to radio astronomers. The third source of rf interference from the rectenna, the generation of broadband noise by the diodes, may also be a cause for concern. No information appears to be currently available on this subject. The potential sources of rf interference arising from the SPS system are summarised in Fig. 1. It appears that interference from the space segment is fairly well understood, interference arising from the transmission medium is in the process of being studied, and effects arising from the ground system have so far been given little consideration. In order to complete the overall understanding of rf interference associated with SPS, it is necessary that studies be conducted on the performance of the ground segment since this may be a very significant source of interference. Fig. 1. Interference tree for the solar power satellite system.
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