A sea clutter simulation method for distributed mimo sky-wave over-the-horizon radar

Abstract

The invention discloses a method for simulating distributed type MIMO sky wave beyond visual range radar sea clutter, and belongs to the field of radar radio wave propagation. An existing simulating method is mainly suitable for a sky wave beyond visual range radar of a traditional (standard) single base or a double-base ground-wave radar but not suitable for the situation of a distributed type MIMO sky wave beyond visual range radar, and not all physical factors are taken into consideration. The method is suitable for the situation of the distributed type MIMO sky wave beyond visual range radar, the geometrical relationship between the incidence direction and returning scattering direction of receiving and sending channels relative to the sea surface of the observing area is calculated based on digital ray tracing, and the scattering sectional area expression of normalization of double-base one-order and two-order sea clutter of all the receiving and dispatching channels is inferred; after the scattering sectional area expression and the Doppler transfer function of a receiving and dispatching propagation path are convoluted, the sea clutter power spectral density of the receiving end is obtained based on the radar equation; lastly, the random time sequence of sea clutter and noise at the receiving end is obtained according to the power spectral density. According to the simulation method, the factors affecting the distributed type MIMO sky wave beyond visual range radar sea clutter are fully taken into consideration, precision is high, universality is good, and the method has popularization and application value.

Description

1. Technical field [0001] The invention belongs to the field of radar electric wave propagation, and in particular relates to a distributed MIMO sky-wave over-the-horizon radar sea clutter simulation technology. 2. Background technology [0002] The adoption of the distributed MIMO system is one of the important trends in the development of sky-wave over-the-horizon radar. The detection of slow-moving ship targets on the sea surface in strong sea clutter is one of the key points and difficulties in sky-wave over-the-horizon radar detection. Distributed MIMO sky-wave over-the-horizon radar adopts multiple transmitting stations and receiving stations with wide spatial distribution. Multiple transmitting stations simultaneously transmit orthogonal transmitting waveforms, which are reflected by the ionosphere to reach the target. After the target is scattered, part of the scattered signal passes The ionospheric reflection reaches each receiving station, and the receiving statio...

AI Technical Summary

Problems solved by technology

At present, the simulation research on sea clutter of sky-wave over-the-horizon radar is based on (quasi) single-base application background, while for distributed MIMO sky-wave over-the-horizon radar, each transceiver channel can be regarded as a bistatic situation, so the above simulation methods are not applicable

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