Global positioning system (GPS) software-defined receivers (SDRs) offer many advantages over their hardwarebased counterparts, such as flexibility, modularity, and upgradability. A typical GPS receiver is readily ...

To exploit unknown ambient radio frequency signals of opportunity (SOPs) for positioning and navigation, one must estimate their states along with a set of parameters that characterize the stability of their oscillators. ...

Multiple receivers with a priori knowledge about their own initial states are assumed to be dropped in an unknown environment comprising multiple signals of opportunity (SOPs) transmitters. The receivers draw pseudorange ...

Motion planning for optimal information gathering in an opportunistic navigation (OpNav) environment is considered. An OpNav environment can be thought of as a radio frequency signal landscape within which a receiver ...

A technique is developed for reconstructing a continuous phase time history from the noncontinuous phase bursts of time division multiple access (TDMA) signals. A continuous phase time history facilitates exploitation ...

A strategy is presented for exploiting the frequency stability, transmit location, and timing information of ambient radio-frequency “signals of opportunity” for the purpose of navigating in deep urban and indoor ...

Opportunistic navigation (OpNav) aims to extract positioning and timing information from ambient radio-frequency “signals of opportunity” (SOPs). OpNav radio receivers continuously search for opportune signals from which ...

A receiver with no a priori knowledge about its own states is dropped in an unknown environment comprising multiple signals of opportunity (SOPs) transmitters. Assuming that the receiver could control its maneuvers in ...

The observability and estimability of collaborative opportunistic navigation (COpNav) environments are studied. A COpNav environment can be thought of as a radio frequency signal landscape within which one or more ...