Research And Verification Of Key Technologies For Missile-borne Networking Waveform

In order to enable the missile to have the ability to transmit detect data in a wide range,it is necessary to install a communication data link on the missile and carry out the networking of missiles between missiles and ground.The farthest communication distance of the missile is 100 km,the maximum speed of flight is Mach 5,and the maximum acceleration is 12 g.The Doppler frequency offset is up to 11 kHz,and the Doppler rate of change is 666Hz/s.Loading the communication system on the missile needs to solve the problem of Doppler frequency offset and the Doppler frequency change rate caused by the high dynamic characteristics;at the same time,it is necessary to consider the contradiction between the communication distance and the power limitation on the missile in the actual scenario;The thesis mainly designs,develops and implements the waveform of the missile-borne network.The main work of this thesis is as follows:First,a detailed and feasible acquisition scheme is designed for the maximum carrier frequency offset in the actual scenario.The time synchronization correlation peak decreases with the increase of the frequency offset,which leads to the deterioration of the acquisition performance.The method of 3-channel separation for Doppler frequency offset is adopted,and the correlation peak results of the three channels are combined,the adaptive threshold is used for the decision;The simulation results show that the probability of successful capture is greater than 90%;the interpolation of the data by the root raised cosine filter makes the time fine synchronization reach 1/10 chip precision,which satisfies the design index;Second,the early and late sequence method of frequency synchronization mode and channel estimation are jointly designed.Using the channel estimation method of superimposing the pilot sequences,the link performance is deteriorated by 2 dB;but this method can save the power on the bomb,and at the same time,the link can resist ±3kHz frequency offset when there is no frequency synchronization processing;The received data is subjected to coarse frequency synchronization compensation;the simulation results show that the designed link can resist frequency offset of ±13kHz;after the frequency synchronization,two channels are used to separate the data and the pilot.Thus,the influence of channel on the signal is eliminated by equalization;Third,according to the simulation results,the hardware implementation and test verification of the link are completed.After implementing the whole data processing flow and performing board-level verification,simulate the missile-borne test scenario;In the intra-board loopback and wireless desktop scenarios,test key parameters such as time synchronization,frequency synchronization,and capture performance;The time synchronization acquisition performance is about 1 dB worse than the simulation;the bit error rate(BER)test is about 1 dB worse than the simulation performance,and the link implementation and simulation results are basically the same,and the performance requirements are met.The work of the thesis provides shceme support for the data acquisition technology of the missile data link.The research results have been verified by engineering,and have reference significance for the design and implementation of the missile data link waveform.