| Satellite navigation system can provide high-precision positioning and timing service.Because the Navigation supremacy is directly related to the trend of war balance,Navigation Warfare has become a new form of operation in modern war.In recent years,with the development and practical application of navigation spoofing technology and navigation spoofing system,navigation combat readiness has attracted more and more attention.However,the traditional navigation spoofing system based on ground platform is restricted by deployment location and landform,which is difficult to meet the requirements of long-distance,over the horizon and high mobility deception tasks.The development of space-based navigation spoofing system based on Spaceborne platform will help to solve this problem.Focusing on the idea of realizing navigation spoofing based on LEO spaceborne platform,this paper studies the precise synchronization of spoofing signal and navigation signal,the spatial distribution of spoofing signal effect and the control mode of spoofing signal.The main research contents and results are as follows:(1)The design concept of spaceborne generative navigation spoofing system based on LEO satellite is proposed.The vulnerability of satellite navigation and the limitation of ground-based navigation spoofing system are analyzed.The feasibility of realizing navigation spoofing based on LEO satellite on-board platform is studied from the aspects of platform orbit selection and system design concept.Theoretical analysis and simulation verify the advantages of LEO satellite in obtaining navigation satellite ephemeris in real time,The basic process of navigation deception based on LEO spaceborne platform is discussed.(2)In order to ensure that the deception signal is covertly injected into the target navigation receiver with low power,the precise synchronization between the deception signal and the navigation signal is studied,which is reduced to the estimation of the signal parameters of the deception signal.The parameter estimation methods and processes of visible satellite,pseudo range and carrier Doppler are given respectively,and the compensation methods of spatial transmission delay and Doppler of deceptive signal are discussed.The simulation verification is carried out combined with the measured data of specific scene,which proves the rationality and effectiveness of the estimation method.(3)A method to analyze the effect and spatial distribution of spoofing signal based on the difference of true and false signal parameters is proposed.The influence of the parameter difference between the spoofing signal and the real navigation signal on the receiving and tracking loop is analyzed,and three spoofing signal injection methods are summarized,such as no loss of lock injection,recapture injection after loss of lock and no injection;The spatial characteristic model of the spoofing signal coverage area is established,and the spatial distribution of the phase difference between the spoofing signal and the real navigation signal number and its influence on the spoofing effect are analyzed,which can provide an important basis for the research of spaceborne navigation spoofing strategy and technical warfare methods.(4)Three spoofing modes of position spoofing under the condition of time invariance,time spoofing under the condition of position invariance and time position joint spoofing are proposed,and the control methods of spoofing signal are studied respectively.An indoor real satellite test environment is built,and the experimental verification is carried out for three kinds of spoofing scenarios.The experimental results show that through the reasonable spoofing signal parameter design,the positioning and timing of spoofing targets can be accurately controlled,which is of great significance to enhance the availability and controllability of spaceborne navigation spoofing. |
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