Research On Detection Methods Of GNSS Spoofing And Kinematic Positioning Accuracy

With the increasing importance of navigation countermeasures,spoofing techniques have moved from the early stage of theoretical research and simulation to the experimental stage.Objective and accurate detection and evaluation of the effectiveness of spoofing equipment,especially its spoofing positioning accuracy,is conducive to mastering the performance level of related equipment and further improving the core performance of the equipment.However,at present,the systematic research on GNSS spoofing at home and abroad is not perfect,especially for the detection method of user dynamic positioning accuracy under the condition of satellite navigation spoofing.For this reason,this paper focuses on the detection of GNSS spoofing and dynamic positioning accuracy,and the main work includes:1.The basic principles of forwarding spoofing and generative spoofing of satellite navigation are introduced,and the main characteristics and effects of the two modes are analyzed.In the two interference modes,the user's pseudo-distance navigation positioning method is the same as that in the non-interference mode,but the signal used is the deception signal,and the dynamic positioning result is the result of deception.2.Aiming at the experimental requirements of dynamic detection of spoofing,a GPS navigation jamming method based on trajectory spoofing is proposed.This method is comprehensive and forwarded deception jamming and the characteristics of emergent deception jamming,first using GPS receiver to obtain target current rough position,and extract the pseudorange,pseudorange rate,timing moment,current ephemeris and signal strength and other important observation,the second will be sent into space and time together with the cheat coordinates observation parameter model,then cheating signal parameters is obtained,generates highly real deception signal and launch.The method was tested by a small and light software radio based miniaturized navigation spoofing platform,and the indoor and outdoor spoofing effects were tested by GPS handheld terminal and uav without the assistance of professional equipment.The experimental results show that this method can effectively deceive the target.3.Under the condition of cooperation,based on the automatic measurement robot,a non-satellite dynamic positioning accuracy detection method and standard are provided for the evaluation of the dynamic positioning accuracy of cooperative target spoofing based on the automatic measurement robot.In order to verify the feasibility of using RTK positioning method to detect the positioning accuracy of automatic measuring robot,and focusing on the data of point alignment problem,analyzes the Lagrange interpolation and linear interpolation method of interpolation effect,runge phenomenon of Lagrange interpolation method is verified and analyzed,the results show that this method can provide deceived cooperation target cm-level positioning accuracy,able to accurately measure the cooperation target trajectory,to cooperation under the condition of dynamic positioning accuracy of GNSS deception jamming provide effective detection means.4.Under the condition of non-cooperative,non-cooperative target cannot carry auxiliary measuring equipment,based on the automatic measurement method can't direct application of robots,but considering the actual application,deception jamming may is mostly carried out for non-cooperative targets,the paper designs the intersection positioning by many sets of laser range finder,cheating for non-cooperative target evaluation provides a deception jamming environment detection method of the satellite technology.First of all,expounds the basic principles of the method for dynamic positioning,analyzes the direct solving method,gradient method,calculation of classic least square method,effect,and put forward the low elevation calculating precision and multiple value problems solution,then,for the method to design the experimental validation of a specific field,and with big xinjiang uav simulation non-cooperative target,experiments have been carried out to verify the method,the results showed that:In a certain range of application,the method in this paper has the plane positioning accuracy of non-cooperative target at the decimeter level and the three-dimensional positioning accuracy at the meter level.After the introduction of redundant observations,the elevation positioning accuracy can be improved to a large extent,thus providing an effective detection method for the dynamic positioning accuracy assessment of non-cooperative target GNSS spoofing.