Inspec keywords: Kalman filters; least squares approximations; object detection; distance measurement; target tracking; RSSI

Other keywords: nonlinear distortions; robust Kalman filter; sensor network environments; pseudogradient algorithm; autonomous robot; decentralised target search; hop count; time stamps; sensor nodes; received signal strength; nonlinear least square method; target searching; maximum likelihood topology maps; target detection; target tracking; physical distance measurement

Subjects: Spatial variables measurement; Interpolation and function approximation (numerical analysis); Digital signal processing; Interpolation and function approximation (numerical analysis); Filtering methods in signal processing