ABSTRACT
Having determined estimates of essential inputs, namely, relative signal strength (RSS), time of arrival (ToA), time difference of arrival (TDoA), direction of arrival (DoA) and frequency difference of arrival (FDoA), we embark on determination of location of transmitter. This is basically a non-linear problem. There are two approaches. In the first approach, the problem is linearized under some permissible assumptions. In the second approach, starting from some initial values, we adaptively update the current values. The adaptive scheme finally converges to the correct estimate, subject to proper selection of the initial values. The selection of the initial values may be based on other available information or determined from other less accurate inputs, such as signal strength or lighthouse effect.
