Research On Inertial Assisted Detection Algorithm For Induced GNSS Deception

With the development of Global Navigation Satellite System(GNSS),the positioning accuracy is getting higher and higher,and its application range is more and more extensive,but at the same time,the deception technology for GNSS satellite signals is becoming more and more mature.The navigation system using satellite/inertial combination can detect most of the deceptive interference to GNSS satellite signals by inertial navigation without interference from external electromagnetic signals,but for the emerging induced deception jamming technology,due to fraud The amount is small,and even the fraudulent interference detection technology based on the integrated navigation system is also facing challenges.Therefore,this paper studies the detection of this kind of deceptive interference mode.The main research contents and innovations are as follows:1)The mechanism,characteristics and technical feasibility of the induced deception jamming signal are analyzed.The inconsistency of motion vector in location spoofing and speed spoofing and the difference between GNSS solution and INS solution result are analyzed,which provides the possibility of detecting spoofing signals.The effects of induced spoofing signals on the pseudorange and pseudorange rate of GNSS are studied by simulation.The theoretical deduction and simulation method is used to study the deceptive interference mode of induced deception with a small correction amount to slowly deviate the carrier position.At the same time,the technical possibility of detecting the induced deception signal based on inertial/single star tight coupling is analyzed.2)In this paper,an inductive deception jamming signal detection method based on inertial/single-chain tightly coupled integrated navigation and inertial/multi-star tightly coupled combined navigation position difference is designed.Through the theory of sequential filtering,the difference between the error correction amount under the real signal and the deception jamming signal is studied.It is analyzed that the difference of the navigation results between the two tight coupling modes in a short time can provide the possibility of detecting the induced fraud signal.Through simulation,it is analyzed that the ability to recognize the forward-induced spoofing signal for a long time is strong,but the detection effect of this method is restricted by the relationship between the receiver and the satellite position,and the identification time is long.3)An inductive spoofing jamming signal detection method based on inertial auxiliary consistency detection is proposed.In view of the position deception and speed deception of the inductive deceptive jamming signal for the moving carrier,it is difficult to achieve the kinematics consistency,and the inertial navigation system can maintain the high precision in a short time,and the deceptive interference will lead to the inconsistency between the GNSS solution information and the INS solution information,so as to realize the discrimination of inductive spoofing interference,The validity of the algorithm is verified by simulation,but it also reflects that the detection effect of the algorithm is restricted by the precision of inertial equipment,and when the precision is low,the algorithm has poor ability to recognize deceptive signals.4)An inductive spoofing detection algorithm based on inertial auxiliary pseudo-distance/pseudo-distance rate estimation is proposed.Aiming at the influence of inductive spoofing signal on pseudo-distance and pseudo-distance rate,and considering that the change of pure inertial navigation position error over time in a short period of time can approximate equivalent to two times function of time,the error relation is used to estimate the pseudo-distance/pseudo-distance rate and establish the time series,and the existence of inductive spoofing signal is judged according The algorithm can still detect the GNSS inductive spoofing signal under the condition that the error accumulation of the pure inertial navigation position of the long time satellite signal is unlocked greatly.Simulation results show that the algorithm is sensitive to inductive spoofing and can identify deceptive signals in a short time,but it also reflects the need for the algorithm to accurately measure the pseudo-distance and pseudo-distance rate of GNSS receivers.5)The experimental platform is built,and the forwarding and generative inductive spoofing jamming processes are realized by transponder and satellite signal Simulator,then the detection effect of each algorithm and the sensitivity to inductive deception are verified,and the advantages and disadvantages of each algorithm are summarized.