Research And Relization On Acquisition Technology Of DS/FH Based On The Internet Of Things

In the age of information, all the information is connected to a highly reliablewireless network, forming a highly reliable wireless network. With the development ofour world aerospace project quickly, satellite navigation position system is becomingan important means of civilian and military activity and is exerting a great effect on thedevelopment of our society. One of such things has to be a strong anti-interferenceability and low detectability of highly reliable wireless mobile communication network,even in the face of strong electronic interference can be kept open.The Direct Sequence Spread Spectrum/Frequency Hopping (DS/FH) hybrid spreadspectrum system can meet the current communication system’s requirements, becauseit combines the advantages of DSSS and FHSS. Now, it has been used in aircraft-groundcommunication systems, and also be widely used in the future to high-speed operationof satellites, UAV or other aerospace vehicles and even near–space aircraftcommunication systems or measurement-control systems, as civil context, it also canused in the3G or4G communication system in the future which require high-speeddata transmission. The performance of pseudo-code acquisition is directly related to thenormal operation and the final performance of DS/FH hybrid spread spectrumcommunication system.This thesis has the background of an actual project, and combined with the basistheoretical of spread spectrum communication technology. In this thesis, we study thetechnology of DS/FH spread spectrum communication system on the conditions of highdynamic. Some simulation studies include:1) This thesis gives a brief analysis of the spread spectrum communicationtechnology, analyzing spread spectrum system’s working process and the theory.Meanwhile, it is a research on the theory of PN code generation. 2) By analyzing the common acquisition algorithm, and combining with therequirements of the project, a suitable acquisition strategy which is PMF-FFT(Partial Matched Filters combined with Fast Fourier Transform) has been putforward and chosen. In addition, we annlyzed the basic principles, processes andperformance and the algorithm in different SNR detection probability, meanacquisition time performance simulation and research.3) Based on theoretical design, this thesis first simulates and analysis theperformance of the signal processing algorithms used in the system, then realizesthe communication system on FPGA hardware platform. The simulation andverification results proved the feasibility of the design.4) Finally, the thesis is summarized and prospected.