Positioning precision improving method based on distributed passive positioning technology

The invention discloses a positioning precision improving method based on a distributed passive positioning technology. According to the method, positioning error correction is realized based on offset circle center estimation; firstly, target position estimation obtained through a two-step positioning method is used as an initial value; then a distance measurement residual error is introduced into fixed offset in a polar coordinate system in a polar radial direction to form an offset circle; and finally, an initial estimation value of a target position is corrected through position vector estimation of the circle center of the offset circle so that more accurate target position estimation is obtained. Compared with a classic distributed passive positioning algorithm, the method provided by the invention has stronger adaptability to sensor layout, has higher precision, has excellent performance under different sensor ranging precision, and has a very good engineering application prospect. 本发明公开了一种基于分布式无源定位技术的