Ambiguity Analysis For Digital Television Terrestrial Broadcasting Signals And Side Peaks Suppression Algorithms

Digital television terrestrial broadcasting (DTTB) signal has high transmitter power, largecoverage area, wide bandwidth used in target detection as external illuminator. It is an external sourcesignal concerned by radar field in recent years. DTTB signal has two kinds of signal forms:singlecarrier mode and multi-carrier model.They have essencial diffences in the carrier modulationmode, frame head model, and positioning technology and etal. Therefore, it is necessary to analysisand compare the target detection performance between the two carrier mode of DTTB signal.In addition, with the development of science and technology, the target acceleration has already become theimportant factor.This paper studies the ambiguity characteristics and target acceleration side peaksuppression algorithm of two carrier mode DTTB signal. The main research content is divided into thefollowing three parts:First, analysis and compared the advantages and ambiguity problem of the two carrierapplication model of DTTB signal used in radar detection through the monostatic radar ambiguityfunction and bistatic radar ambiguity function. Then infers the side peak of bistatic ambiguity functionappearing position, causes and the relationship with the side peak positions appeared in monostaticradar ambiguity function. The results show that single carrier DTTB signal contains the periodicalframe head, which produce range side peak, caused the range ambiguity problem; Multi-carrier DTTBsignal contains strong regularity of frame head sequence phase, and frame head power is double offrame body’s,which lead to range and doppler side peak, and cause range and velocity ambiguityproblem. Single carrier DTTB signal ambiguity function is better in two kinds of carrier applicationmode. The periodic of frame head and the power difference between frame head and frame bodybecome the main factors of radar detection performance based on DTTB signal.Second, the traditional bistatic radar resolution theory ignored the signal form of difference. As asupplement, the influence of bistatic radar range and velocity resolution what signal form causes hasanalyzed through the simulation, and then quantitative analysis and comparison of resolutionperformance of two DTTB signal form has been done. The simulation results show that the same timelength of DTTB signal, single carrier DTTB signal has longer duration width(effective related time)and more continuous spectrum width(effective related bandwidth), and have better natural rangeresolution and speed resolution. And in the same geometrical configuration and the same time lengthconditions, the range and velocity resolution of single carrier mode of DTTB signal is relatively moreoptimal. Third, propose an algorithm to mitigation the side peaks based on the target acceleration. DTTBsignal has range and velocity ambiguity problem.due to the periodic of frame head and the powerdifference between frame head and frame body.This paper describes target echo characteristics andambiguity characteristics under the influence of, acceleration. and DTTB signal of target echocharacteristics and side peaks suppression performance.is analyzed by the simulation.The results showthat the algorithm can effectively suppress range and doppler side peaks.It has theory and applicationvalue.The work of this paper can provides reference for further research based on DTTB signalexternal source radar parameter estimation and performance analysis and bistatic radar base stationdistribution.