Development of a quasi time stretch technology for indoor positioning system based on pulse modulated ultra high frequency radio

Data acquisition of high speed signal is a major challenge in developing a high accuracy Indoor Position System (IPS) based on Ultra High Frequency (UHF) Radio. The proposed technology is developed to achieve a high time resolution for Time Difference of Arrival (TDOA) estimation in a hyperbolic position fix IPS. This device works as the interface component embedded in the distributed sensor nodes of the IPS and is dedicated to convert the incoming UHF signal down to low frequency typically less than 1 MHz that enables the use of conventional relative low speed ADC product. The circuit model is simulated in Advance Design System (ADS) environment. Performance of the Wilkinson power combiner is evaluated using High Frequency Structural Simulator (HFSS).