| Ship-borne fire control radar is an essential weaponry on naval vessels.The ship-borne fire control radar is designed to detect and track the targets,such as enemy planes,warships and anti-ship missiles.Then the real-time accurate geographic coordinates are provided for the fire control system of naval gun or missile to resolve the target information and guide weapon to effectively strike or destroy the enemy target.With the development of ship-borne weaponry and the escalation of modern naval warfare,the traditional fire control radar with single function can no longer meet the requirement.Therefore the multifunctional fire control radar with synthetic battle capability has become an inevitable trend.Based on the design scheme of ship-borne multi-functional fire control radar signal processor,the design and implementation of information processing software are introduced in this paper.First,low angle of multipath echo model is established,and the scattered signal of the low altitude target in the offing and multipath mathematical model are introduced.The reflection coefficient of sea surface is illustrated from two aspects,i.e.specular reflection and diffuse reflection.Besides,the influence of multipath effect on radar target signal is measured by the pattern propagation factor.In addition,the probability density function(PDF)of target echo power statistics is provided for multipath propagation.Under the condition of fixed false-alarm probability,the required signal noise ratio(SNR)for corresponding secondary detection threshold is obtained by simulation.Based on the fact that multipath effect can influence the tracking of a-b filter for low altitude multipath target,a target tracking method is proposed based on information fusion of multi-frequency echoes.And the relative implementation procedure is provided.Second,the system overview and implementation of the information processing software are introduced.The system overview consists of several main aspects,i.e.,the basic structure of information processing board,the functional partition of different DSP on the board,the internal and external interface design,the communication transmission mechanism inside the board,and the communication transmission mechanism between the board and the front-end signal processor and the back-end center control machine.The ship-borne fire control radar has different work patterns,which can be switched by the data processing program according to the wave control information.The design decision of information processing software includes initialization and the working state.In the working state,the data processing flowchart is analyzed in the reference search pattern and reference track pattern.Besides,the implementation and flowchart of several function processing units are provided,including consolidated data unit,search distance detection unit,track threshold detection unit,and flight path building and filtering unit for single target.Finally,the measured data are collected in radar working state.Based on the analysis of measured data,the performance of radar is verified in three aspects,i.e.,the choice of the secondary detection threshold,the realization of the function of tracking,and the moving target tracking performance.The moving target tracking performance of radar is validated by tracking a moving car.The experiment result shows that information processing software can work stably and the radar can track the moving target. |
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