Narrow Results

This paper develops an uncertainty propagation analysis method to analyze transmit/receive (T/R) modules with uncertain parameters, such as variability and tolerances in the physical parameters and geometry produced in the manufacturing processes. The method is a combination of the variance decomposition-based sensitivity analysis and the moment-based arbitrary polynomial chaos (MBaPC). First, the electromagnetic simulation model of a practical T/R module is created. Secondly, based on the model, the sensitivity analysis is carried out to determine the sensitive parameters to the amplitude difference and the phase difference between the input and output electromagnetic signal. Thirdly, their four order statistical moments are calculated using the MBaPC. At last, according to the maximum entropy principle, the statistical moments are used to fit the probability distribution functions of the amplitude difference and the phase difference of the T/R module. The results computed by MBaPC have been validated accurate and efficient compared with Monte Carlo simulation approach.

Antenna phase center offsets (PCO) and phase center variations (PCV) play an important role in high-precision GNSS applications. For the fixed pattern antenna array, the amplitude and phase difference between antennas may cause phase center degrading. In this paper, the effect of amplitude and phase difference on the phase center is studied. The method of computing the PCO and PCV for a given antenna pattern is first described, followed by the calculation of the far-field phase pattern including the amplitude and phase difference for the antenna array. Lastly, the phase center character of a two-element patch antenna array is presented and analyzed as a practical example.