Research On Radio Stealth Technology For Data Link From Missile To Satellite

Data Link plays an important role in the military field,but with the advancement of passive detection technology,the radio frequency(RF)exposure risk of data link is increasing.Therefore,the data link should not only meet the communication performance,but also consider its RF stealth capability.In this paper,the data link form missile to satellite is used as the object to study its RF stealth technology.The main work and contributions of the paper are:(1)This paper details the research and development condition of data link and passive detection systems at home and abroad.(2)This paper studies typical communication anti-jamming techniques,including direct sequence spread spectrum,frequency hopping spread spectrum and transform domain communication techniques and introduces the measurement indicators of RF stealth performance,such as interception distance,interception factor and interception probability.The calculation formula of the detection probability is derived based on the energy detection principle in the additive Gaussian white noise channel,and uses it to evaluate the RF stealth performance of the missile data link.(3)This paper studies and proposes a radio frequency stealth design method for the data link from missile to satellite.First,it analyzes the typical error control coding technology of the satellite data link: Turbo code and LDPC code.Then,it studies data-assisted symbol synchronization and carrier synchronization and the Schmidl algorithm that unifies the two.Finally,based on the satellite link equation,under the premise of adopting the turbo coding method and meeting the symbol and carrier synchronization,the paper studies the effects of modulation mode,transmission rate,antenna gain,carrier frequency,and transmit power on satellite link establishment and radio frequency stealth performance.Simulations show that the RF stealth design method of the satellite data link proposed in this paper can effectively reduce the detection probability of the data link compared with the traditional satellite link design method.(4)This paper studies and proposes the side-lobe RF stealth technology of the satellite data link assisted by noise interference.Under the premise that the radiated power of the data link from missile to satellite is higher than the detection threshold of the enemy airborne interception receiver,the paper first analyzes the performances of the multi-beam amplitude-comparison direction finding system and the interferometer direction-finding system,and it shows that the phase ambiguity of single baseline interferometer is not conducive to the angle sorting of signals by enemy airborne interception receivers.Then the paper studies the direction finding performance of the enemy airborne interception receiver to the satellite data link under the condition of noise interference.And the signal-to-noise ratio obtained by the enemy airborne interception receiver after noise-assisted interference is estimated using a high-order cumulate algorithm.Simulations show that the noise interference assistance method proposed in this paper can effectively reduce the measured direction accuracy of the data link.