Research On Target Detection Of Multi Pluse Wideband Radar

Compared with the ordinary radar with low resolution,the high range resolution characteristic of the wideband radar makes it excellent for the detection ability of the target.However,the range walk problem will be encountered in the target detection,which will deteriorate the performance of target detection.In the wideband radar target detection,first the Keystone transform is used to correct the range walk,and then Doppler ambiguity compensation is followed.Finally,the two dimensional IAA spectral estimation algorithm is used to replace the two-dimensional FFT algorithm for the coherent accumulation of the target,so that the sidelobe of the spectrum is suppressed and the width of the main lobe is reduced,thus improving the detection performance of the wideband radar target.Since Keystone transform and 2-D IAA spectrum estimation algorithm have corresponding fast algorithm,they can be implemented by real-time processor DSP or FPGA.In this paper,we use TI's multi-core processor TMS320C6678 to complete the algorithm design.The main contents are summarized as follows:1.A wideband radar target detection method based on Keystone transform and 2-D IAA spectrum estimation is studied.Firstly,the wideband radar target echo model is modeled,and the causes and the effects on coherent accumulation in the wideband radar target detection are analyzed.Secondly,the principle of Keystone transform and the implementation of Chirp-Z transform are studied.Finally,the analysis results are verified by simulation.2.A wideband radar target detection method based on 2-D IAA spectrum estimation is studied.Firstthe two-dimensional IAA spectrum estimation is extended on the basis of the one dimensional IAA spectrum estimation algorithm,and the two-dimensional FFT is replaced by the two-dimensional coherent accumulation of the target,and the analysis results are verified by simulation.Secondly,Radars with the same rangeresolution require more pulses to be processed in order to obtain the same migrationat ambiguity velocity.Therefore,in this paper,the fast implementations of IAA for 2-D spectral estimation is further proposed.With the increase of the amount of data,the fast algorithm can reduce the amount of computation in order of magnitude.Finally,the results of the analysis are verified by simulation.3.The program fusion design based on TMS320C6678 multi-core processor is studied.Firstwe studyfour main modules in multi-core DSP TMS320C6678:The first module,first of all,expounds the basic concepts related to EDMA3 controller,EDMA3 transmission type and parameter RAM,Then discusses the transmission mechanism of EDMA3,and lists three examples of EDMA3 data moving,and finallysome suggestions for improving the performance of EDMA3 are given;The second module discusses Cache Cache coherencyproblem;The third module analyzes how to use hardware semaphore for inter nuclear communication;the fourth module briefly introduces the memory management of the C6678,and give some design suggestions for the rational planning and using of memory.Based on the previous four C6678 main modules and the characteristics of the multicore processor C6678,the corresponding multi-core programming ideas are put forward,andmulti-core optimization is carried out from two aspects of data transmission and data operation to achieve real-time processing.Secondly,for the problem of using different addresses for the same code in shared storage encountered by multi-core parallel running,a corresponding solution is proposed..Finally,the program fusion design scheme is given.Finally,a detailed program fusion design is given,and the results are compared by simulation.