Study Of Angle Measurement Performance On Distributed Multi-Shipboard HF Surface Wave Radar

Distributed multi-shipboard HF surface wave radar that Composed by multiple certain arrangement of shipboard radar platform is a new system of sea detection system and has the advantages of high maneuverability, flexible configuration of radar system resources, good angle estimation performance, mutual cooperation. Compared to other system of radar platform, it’s more complex systems and signal processing, there are many key technologies that need to be resolved, especially cross platform of coherent signal processing, so the focus of this paper is using the virtual interpolation for the receiving ship array reconstruction and signal reconstruction, specific as follows: firstly, through the array reconstruction the receiver array mapping for the virtual array, and then through the signal reconstruction will each sub array receiving data reconstruction for virtual data. Finally the virtual data using traditional direction of arrival(DOA) estimation algorithm obtain the estimation of the target range.Virtual interpolation transform can be any structure or time varying array reconstruction for the virtual array, the reconstruction will be the receive d data signal to noise ratio attenuation, so the choice of virtual array structure need to consider the signal to noise ratio decays as small as possible, and the corresponding virtual data easily after arithmetic processing, usually the middle times of that of the physical array structure or virtual uniform linear array as the structure of the virtual array. The main factors that affect the virtual array design are interpolation width, virtual array structure and so on, the interpolation width affects the interpolation precision of the real array to the virtual array, and the structure of the virtual array affects the attenuation of the signal to noise ratio. Through the simulation experiment for static array and time varying array reconstruction error analysis, and use based on virtual interpolation of the DOA estimation algorithm for target azimuth resolution, based on virtual interpolation of spatial smoothing MUSIC algorithm give up prewhitening of colored noise, and by increasing the subspace smoothing array data compression substrate noise to reduce influence of colored noise.Based on the derivation of the dynamic geometry relationship of the distributed multiple-shipborne radar system, the distance and the relationship between the launch shipborne, the target and the receiving shipborne are obtained. Studied distributed shipborne radar system of bistatic angle changes and board of the first-order sea clutter spectrum spread effect, second order sea clutter waves and atmospheric noise as the spatial colored noise treatment for movement of the ship, and iterative method is used to build the spatial colored noise model. On the basis of dynamic geometry, the distance and the speed of the system to be satisfied when the target is in the same range of the distributed array is derived from the Doppler unit. Set up different situations of distributed multi shipboard radar received signal model and under the first order sea clutter wave and spatially colored noise interference, in the same range Doppler cell target using interpolation virtual spatial smoothing MUSIC algorithm based on azimuth resolution, and list array resolution results compared obtained in low signal to noise ratio based on Distributed Virtual interpolation of shipborne radar has better DOA estimation performance.