In this article, we study technical issues involving wide-area surveillance system using multilateration sensors. A satellite clock reference scheme is seen as a better solution for synchronization of widely dispersed sensors. We then described a direct solution approach to derive target positions. Techniques are developed for resolving solution ambiguities, including different sensor combinations and tracking algorithms. It is also proposed that signal strength comparison and other techniques be used to enhance tracking performance and accuracies with Mode A/C data. Finally, some recent flight test results are shown to demonstrate the feasibility of multilateration system for wide-area surveillance.
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