Helicopter Target Recognition Method under Radar LPRF Working Condition

Abstract

The invention provides a helicopter target recognition method used under a radar LPRF working condition. The helicopter target recognition method comprises the following steps that a time-frequency two-dimensional distribution diagram of an echo of a radar under the LPRF working condition is constructed, distribution characteristics of a helicopter main rotor echo in the frequency dimension are obtained, a helicopter body echo is removed, a main rotor echo is reserved, training is performed by adopting actually measured main rotor echo data to form a frequency domain template, an Euclidean matching measurement technology is adopted, the frequency domain template and the radar echo time-frequency two-dimensional distribution diagram are matched to form a two-dimensional output matrix, a minimum Euclidean distance region is found in the two-dimensional output matrix to be used as an optimal matching region, the optimal matching region is mapped to the original radar echo time-frequency two-dimensional distribution diagram, and distance and speed information of a helicopter target is obtained. According to the helicopter target recognition method, the recognition probability of the radar on the helicopter target can be effectively improved, the method is particularly suitable for detection and recognition of a radar system on the helicopter target in a complex electromagnetic environment, and the accuracy of detecting and recognizing low-altitude, low-speed and weak-small targets by the current radar can be improved.

Description

technical field [0001] The invention relates to the field of radar target recognition, in particular to a helicopter target recognition method under radar LPRF working conditions. Background technique [0002] Modern radar systems are becoming increasingly sophisticated and complex sensors. The radar's working ability has evolved from the initial detection and tracking of targets to the ability to provide complex microwave images and have the ability to identify targets. The helicopter target is one of the key detection targets of the radar system. [0003] Helicopters are playing an increasingly important role in modern warfare, especially in tasks such as anti-submarine, anti-tank operations, and battlefield reconnaissance. However, the radar reflection cross-section (RCS) of the helicopter is small. When the helicopter is hovering, the echo frequency of the fuselage coincides with the frequency of the main lobe clutter of the sea or ground clutter. It is difficult to de...

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Problems solved by technology

In this mode, the radar speed measurement range will be narrowed, and if the target moves fast, the speed measurement will be blurred

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