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The growing interest in the area of nano-satellite development has escalated in the recent years. Space agencies and private industries have started developing nano-satellites for more serious missions in the areas of Space Operations, remote sensing and Space Research. The sudden increase in the number of nano-satellite missions has led to a chall...
Contexts in source publication
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... timeline of nano-satellite missions is shown in Figure 1. The nano-satellite missions mainly started off as a university initiative in 1999, using nano-satellites as an educational tool to educate students to develop satellites within a short span of time. ...
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... validate the performance of the LINC with that found in Figure 10 shows the constellation diagrams of 16-QAM and 16-APSK, the blue dots represents the received symbol and red dots represent the expected symbol. Based on this, EVM is calculated. ...
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... output impedance seen by the HEMTs is shown in Figure 11, it can be seen that at even harmonics the impedance is not matched very well. Thus, it is proposed to improve the harmonic matching circuit in the future design and also look at the possibility of implementing Inverse-F design. ...
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... a preliminary study, radiation pattern of two crossed dipoles were simulated (435MHz) for various out-phasing angles. Figure 12 shows the radiation pattern when two crossed dipoles are fed with signals with zero out-phasing angles. Similarly simulations were performed for signals with out-phasing angles up to 90 degrees and it was noticed that the gain varied from 3.4dBi (0 0 out-phasing angle) to 3dBi (90 0 out-phasing angle). ...
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... the modifications done to setup proved to be very reliable compared to the previous ones, it was noticed that the non-linarites caused by the mixer and the driver PA becomes unpredictable when the measurement setup is kept ON for a long time. Thus, one of the recommendations provided to improve the measurement setup is shown in Figure 13. The recommended setup nullifies the additional non-linearity caused by the mixers and the driver PAs and only the performance of the LINC PA can be measured more accurately. ...
Citations
... The outphasing signals S 1 (t) and S 2 (t) are generated using the same setup as in [9] [10]. First, 4000 random 16-QAM symbols are generated in Matlab. ...
