AbstractRay tracing, Finite-Difference Time-Domain, Shooting and Bouncing Ray, and Generalised Ray Expansion are techniques that can model the wave propagation in a specific site. Although, these techniques work well, they exhibit some drawbacks that Iterative Physical Optics (IPO) technique can overcome. IPO can predict the wave propagation, by using the surface current of an object based on Kirchhoff approximation.
In this project, IPO will be used and implemented in a software written in Pascal language, subsequently of a previous embodiment, and an indoor propagation scenario will be simulated. IPO will be combined with FDTD and an analytical method, creating two hybrid methods for predicting the wave propagation. Walls and other objects acting as obstacles inside a building, are discrete into smaller objects such as bricks that show a periodic pattern. This feature will be exploited, and by the usage of the previously mentioned methods, the radiation of a ray inside an object will be calculated. The results will be used from the IPO algorithm to calculate the energy arriving at the receiver propagating through a complex lossy structure.
The drawbacks and the shortages of the previous software will be implemented at first. The simulated results will be compared with measured results, coming from experiments conducted from the University of Bristol. In addition to that, the code will be optimised to increase the performance of the simulator. The results from the simulations show, that both hybrid techniques predict accurately the propagation characteristics. Using the analytical method, the accuracy is increased because a more complex structure is taken into account.
|Date of Award||14 Nov 2014|
|Supervisor||Christopher Railton (Supervisor)|