Most ray tracers treat the problem as a Hamiltonian optics problem given an index of refraction, i.e., the ionosphere in this case. However, Coleman 2011 developed a method for ray tracing that used a direct variation method. The advantage of this method is that the endpoints of the ray remained fixed, while in more standard ray tracer, rays are launched until a link is made between the transmitter and receiver. Development of this method may provide a potentially efficient method for determining the link between a transmitter receiver pair, given a model ionosphere. We present efforts toward implementing the methodology described by Coleman 2011.

JF - HamSCI Workshop 2021 PB - HamSCI CY - Scranton, PA (Virtual) UR - https://hamsci2021-uscranton.ipostersessions.com/?s=3A-71-3B-21-F1-51-7F-5B-44-BE-57-61-1A-79-02-6B ER - TY - Generic T1 - Toward interpretation of HF propagation data obtained by the HamSCI Community - Ray Tracers and Ionospheric Models T2 - HamSCI Workshop 2021 Y1 - 2021 A1 - Stephen R. Kaeppler A1 - Scott Driggers A1 - Andrew Wetzel A1 - Alexander Murtha A1 - Tedi Godfrey AB -Perhaps one of the most pressing questions the Ham Sci community needs to address is how data obtained by the tangerineSDR or other platforms will be interpreted to obtain scientifically useful information. One approach is to produce an appropriate forward model describing the ionosphere and use ray tracers to convert that model into observables that are measured using SDRs. The purpose of this talk is to discuss these issues in general terms, but also to discuss simulation strategies that could be useful for the data collected by a network of radio amateurs. I will also present on the development of an open source python-based 3-D Jones Stephenson Ray tracer and other developments out of my laboratory that are relevant to ray tracing, including implementation using cuda and the development of point-to-point ray tracing.

JF - HamSCI Workshop 2021 PB - HamSCI CY - Scranton, PA (Virtual) ER -