Abstract: Position location processing using a series of processing routines for enhanced position location in a hyperbolic ranging system adapted to more accurately indicate the position of mobile transmitters within the system. These routines incorporate data in an overdetermined system to refine the position estimate and speed up computation time. The processing utilizes all data received and filters out data caused by radio propagation measurement error that contributes to overall position error. It selects the optimum subset of data to process prior to performing time-intensive mathematical operations which results in a substantial reduction in computation time, allowing for many more overall position computations per second. The advantages of the present position location processing include its ability to incorporate all data received to reduce the overall position error. Processing filters that provide for data extraction and position verification enhance the accuracy and reliability of the position estimate.