Navigation Deception Signal Detection Based on Antenna Rotation and Azimuth Mutual Angle Contrast

With the wide application of satellite navigation, positioning and timing function in civil infrastructure, the reliable and effective operation of these important facilities strongly depends on the safety of satellite navigation system. The detection on navigation deception signals is one of the important methods to ensure safety, which has become a research hotspot in recent years. Among many methods the detection based on spatial direction information makes full use of the characteristics of electromagnetic wave direction which is difficult to be replicated, and has the features of high detection accuracy and strong ability to distinguish true from false. However, most of the existing methods need to be based on multi-antenna or multi-platform direction finding. In order to solve this problem, the new method is put forward in this paper. Firstly the pattern characteristics of the satellite navigation signal receiving antenna are deeply studied. The intensity of each satellite navigation signal captured is measured by the tilt rotation of a single antenna, and the azimuth angles of actual arrival for satellite navigation signals are obtained by the maximum fitting estimation after the curve smoothing. Then the azimuth angles of the reference signals are calculated by the navigation satellite almanac information downloaded beforehand. Based on the information, the deception jamming signal can be judged effectively by contrasting the actual azimuth mutual angle matrix with the reference one. The validity and accuracy of this method are verified by simulations. It provides a new technical way for the single antenna satellite navigation receiver to detect on navigation deception signals by spatial information.