초록 ▼

The present invention relates to a method of eliminating ground echoes for a meteorological radar. The ground echoes being received from a predetermined area by a radar, the radar illuminating, for a predetermined number R of transmission recurrences, the area over a number P of distance cells, the

The present invention relates to a method of eliminating ground echoes for a meteorological radar. The ground echoes being received from a predetermined area by a radar, the radar illuminating, for a predetermined number R of transmission recurrences, the area over a number P of distance cells, the method includes a step for calculating a spatial statistical parameter of the cluttered echoes received by the radar in response to the recurrences over an analysis path for distance cells, and a step to compare the spatial variation level of the spatial statistical parameter along the analysis path, the echoes being considered to be ground echoes when the level of said variation is greater than a predetermined threshold.

대표청구항 ▼

1. Method of eliminating ground echoes received from a predetermined area by a radar, the radar illuminating the predetermined area for a predetermined number R of transmission recurrences and over a predetermined number P of distance cells, wherein the method comprises the steps of: calculating a s

1. Method of eliminating ground echoes received from a predetermined area by a radar, the radar illuminating the predetermined area for a predetermined number R of transmission recurrences and over a predetermined number P of distance cells, wherein the method comprises the steps of: calculating a spatial statistical parameter of cluttered echoes received by the radar in response to recurrences over an analysis path for distance cells; andcomparing a spatial variation level of the spatial statistical parameter along the analysis path, wherein the echoes are determined to be ground echoes when a level of the spatial variation is greater than a predetermined threshold. 2. Method according to claim 1, further comprising the step of calculating the spatial statistical parameter successively over a window centered on a distance cell, wherein the window comprises a sliding window along the analysis path. 3. Method according to claim 2, wherein the temporal average power is calculated over substantially all the distance cells of the sliding window. 4. Method according to claim 2, wherein the spatial statistical quantity is calculated over a sliding window centered on a distance cell of order icd, wherein Q is a number of distance cells in the sliding window. 5. Method according to claim 1, further comprising the steps of: integrating temporally the spatial statistical parameters, successively calculated over substantially all the illuminated area, to produce a signal used in the step of calculating; andcomparing a level of variation of the integrated signal to a predetermined threshold. 6. Method according to claim 5, wherein the step of integrating temporally is calculated over substantially all the R recurrences. 7. Method according to claim 1, wherein the calculated spatial statistical parameter comprises a temporal average of a locally reflected power. 8. Method according to claim 7, wherein the temporal average is an average of received power at a level of a distance cell. 9. Method according to claim 1, wherein the spatial statistical parameter is determined in accordance with the following relationship: Yicd=log⁡(1Q⁢∑i=-Q2Q2⁢Xi+icd)-1Q⁢∑i=-Q2Q2⁢log⁡(Xi+icd)wherein: Yicd is the spatial statistical parameter;Xi+icd is a temporal average power received at a level of a distance cell of order i+icd; andQ is a number of successive distance cells over which the spatial statistical parameter is calculated. 10. Method according to claim 1, wherein the analysis path is situated on a distance axis of the radar. 11. Method according to claim 1, wherein the analysis path comprises a multidimensional path over which the spatial variation level is less than a predetermined value.