Some design aspects of mobile local positioning systems

New radio technology suit very well to implement mobile positioning systems, because the future signals are wideband and software radio (SDR) defined platforms are used for implementation. If the used communication system is not sufficient for required positioning purposes, the SDR principle allows that the same platform is used or divided by a positioning system. These positioning systems function anywhere where the underlying communication systems have a sufficient coverage for positioning. Alternatively, a sufficient coverage can be guaranteed locally by establishing a positioning network. These local mobile positioning systems serve as a backup to or as a more robust alternative to global navigation satellite systems that are known to be rather vulnerable to interference. In this paper some design aspects of interference immune local mobile positioning systems are considered. The considered topics include a short introduction to the Finnish Software Defined Radio Programme, which covers both communications and positioning systems in the same platform. Topics considered herein include also positioning network design, delay estimation in frequency hopping systems with few samples and interference mitigation techniques both for single antenna and adaptive antenna receivers.