Airborne meteorological radar ground clutter suppression method based on double threshold control

Abstract

The invention relates to an airborne meteorological radar ground clutter suppression method based on double threshold control. The airborne meteorological radar ground clutter suppression method comprises the following steps of: 1) reading inertial navigation parameters and a radio altitude value from an airborne navigation equipment; 2) compensating a clutter frequency spectrum center nearby a zero doppler frequency by utilizing prior information to obtain a clutter region and a spectrum width evaluation initial value; 3) calculating an echo power of each distance unit; 4) evaluating a clutter spectrum center and a spectrum width by utilizing a polar coordinate centroid method; 5) setting a control factor according to the echo powers; 6) calculating a spectrum width threshold and an amplitude control threshold by utilizing the control factor; 7) calculating the number of doppler channels (exceeding the thresholds) in the clutter region of each distance unit; and 8) utilizing the number of the ultralimit channels to design a self-adaptive notch filter, so that the aim that an airborne meteorological radar ground clutter can be realized. The airborne meteorological radar ground clutter suppression method is suitable for airborne meteorological radar ground clutter suppression in a wind shear mode and is simple; and with the adoption of the airborne meteorological radar ground clutter suppression method, the clutter suppression effect is good, and influences on target signal albefaction during the clutter suppression and influences of a residual clutter on a wind shear signal can be reduced.

Description

technical field [0001] The invention belongs to the technical field of airborne radar clutter suppression, in particular to a method for airborne weather radar clutter suppression based on double threshold control. Background technique [0002] Low-altitude wind shear is recognized as the most harmful weather phenomenon to flight safety during aircraft take-off and landing. Microburst is a typical low-altitude wind shear phenomenon, which has the characteristics of divergent velocity in the radial direction, and The positive and negative velocity difference reaches 10m / s or more, and the duration does not exceed 10 minutes. At this time, the airflow is like a shearing movement. When an aircraft encounters low-altitude wind shear, it is often because the flying altitude is too low that there is not enough space for adjustment, and serious accidents of aircraft crashes and fatalities occur. Although the currently installed airborne weather radar already has the function of fo...

AI Technical Summary

Problems solved by technology

The existing airborne weather radar ground clutter suppression technology has technical problems such as complex calculation, clutter suppression effect is greatly affected by the reference signal, and clutter residue submerges useless signals.

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