초록 ▼

Various embodiments are described herein for a moving target detector that processes input data to perform detection for a current range cell. The moving target detector includes a Doppler filter bank module for processing the input data to provide several Doppler outputs for the current range cell,

Various embodiments are described herein for a moving target detector that processes input data to perform detection for a current range cell. The moving target detector includes a Doppler filter bank module for processing the input data to provide several Doppler outputs for the current range cell, a no-land-clutter path for processing several input data sets related to the several Doppler outputs to provide detection data by performing peak selection on each of the several input data sets and performing detection on the results of the peak selection, a land-clutter path for processing the several input data sets to provide detection data by performing Constant False Alaπn Rate (CFAR) detection on each of the several input data sets and merging the detection results; and a switching logic module for selecting one of the land-clutter path and the no-land-clutter path based on clutter information.

대표청구항 ▼

The invention claimed is: 1. A moving target detector for processing input data to provide detection data, the moving target detector comprising: a Doppler filter bank module for processing the input data to provide plurality of Doppler outputs for a current range cell; a land-clutter path for prov

The invention claimed is: 1. A moving target detector for processing input data to provide detection data, the moving target detector comprising: a Doppler filter bank module for processing the input data to provide plurality of Doppler outputs for a current range cell; a land-clutter path for providing first detection results based on the plurality of Doppler outputs; a no-land-clutter path for providing second detection results based on the plurality of Doppler outputs; a switching logic module for selecting one of the land-clutter path and the no-land-clutter path based on clutter information; and a range line multiplexer for providing the detection data by combining the first and second detection results across a plurality of range cells. 2. The moving target detector of claim 1, wherein the no-land-clutter path comprises: a peak selector for receiving a plurality of input data sets related to the plurality of Doppler outputs and providing a peak output data set by selecting the input data set having the largest power; a video integrator for video integrating the peak output data to provide video integrated data; and a detector for processing the video integrated data to generate the second detection results. 3. The moving target detector of claim 2, wherein the no-land-clutter path further comprises a second time around target suppression module for reducing erroneous detection results in the second detection results. 4. The moving target detector of claim 2, wherein the no-land-clutter path further comprises a weather clutter canceller for reducing weather clutter in the plurality of input data sets prior to processing by the peak selector. 5. The moving target detector of claim 4, wherein the no-land-clutter path further comprises: a weather clutter canceller activate logic module for checking a dynamic weather map for weather clutter and activating the weather clutter canceller when the weather clutter is found; and a weather map module coupled to the weather clutter canceller activate logic module for generating and updating the dynamic weather map. 6. The moving target detector of claim 2, wherein the detector is a cell averaging Constant False Alarm Rate (CFAR) detector configured to employ an early range and late range average with peaks edited threshold, a scaled no-land-clutter dynamic clutter map value for pixel threshold, a digital sensitivity time control map based on minimum cross section threshold, and a geo-censor map threshold. 7. The moving target detector of claim 2, further comprising a transition range value table adapted to store at least one transition range value for each azimuth segment of the radar data. and wherein the clutter information is obtained from the at least one transition range value for each azimuth segment corresponding to the current range cell. 8. The moving target detector of claim 7, wherein the switching logic module is configured to select the no-land-clutter path when the current range cell is at a range greater than a maximum transition range value at a corresponding azimuth segment in the transition range value table. 9. The moving target detector of claim 7, wherein the switching logic module is configured to select the no-land-clutter path when the current range cell is at a range greater than an odd number of transition range values at a corresponding azimuth segment in the transition range value table. 10. The moving target detector of claim 7, wherein the at least one transition range value for one of the azimuth segments is obtained from range values for cells at a corresponding azimuth segment in a clutter map having a clutter level less than a clutter threshold. 11. The moving target detector of claim 10, wherein the clutter map is a dynamic clutter map when anomalous propagation is detected, and a clear day clutter map otherwise. 12. The moving target detector of claim 7, wherein the at least one transition value for one of the azimuth segments is obtained from a maximum of: a first maximum range value for a clear day clutter map cell at a corresponding azimuth segment having a first clutter level larger than a first threshold, a second maximum range value for a dynamic clutter map cell at the corresponding azimuth segment having a clutter level larger than a second threshold plus the first clutter level, and a third maximum range value for a dynamic weather map cell at the corresponding azimuth segment having a clutter level larger than a third threshold. 13. The moving target detector of claim 2, further comprising a clutter map having clutter information stored therein and wherein the switching logic module is configured to select the land-clutter path when clutter level in a cell of the clutter map that corresponds to the current range cell is larger than a clutter threshold and to otherwise select the no-land-clutter path. 14. The moving target detector of claim 13, wherein the clutter map is a dynamic clutter map when anomalous propagation is detected, and a clear day clutter map otherwise. 15. The moving target detector of claim 2, wherein the clutter information comprises a clear day clutter map, a dynamic clutter map and a dynamic weather map, and the switching logic module is configured to perform thresholding on each of the maps, combine the thresholding results and select one of the no-land-clutter path and the land-clutter path based on the combined thresholding result. 16. The moving target detector of claim 15, wherein the switching logic module is configured to select the no-land clutter path when a first clutter level in a clear day clutter map cell corresponding to the current range cell is less than a first threshold, a second clutter level in a dynamic day clutter map cell corresponding to the current range cell is less than a second threshold plus the first clutter level, and a third clutter level in a dynamic weather map cell corresponding to the current range cell is less than a third threshold. 17. The moving target detector of claim 15, wherein the switching logic module is configured to select the no-land clutter path when a first clutter level in a clear day clutter map cell corresponding to the current range cell is less than a first threshold, a second clutter level in a dynamic day clutter map cell corresponding to the current range cell is greater than a second threshold plus the first clutter level, and a third clutter level in a dynamic weather map cell corresponding to the current range cell is greater than a third threshold and less than a fourth threshold. 18. The moving target detector of claim 2, wherein the land-clutter path comprises: a CFAR detection module for processing the plurality of input data sets to provide a plurality of CFAR outputs; a Doppler merge module for processing the plurality of CFAR outputs to select the largest CFAR output; and a binary integrator for providing the first detection results by processing a plurality of selected largest CFAR outputs to indicate a detection when a minimum proportion of the plurality of selected largest CFAR outputs indicate a detected target. 19. The moving target detector of claim 18, wherein the CFAR detection module is configured to employ the greatest of CFAR technique based on an early range with peak edited threshold, a late range average with peak edited threshold, a scaled dynamic clutter map value for pixel threshold, a digital sensitivity time control map based on minimum cross section threshold, and a geo-censor map threshold. 20. The moving target detector of claim 18 further comprising one of a magnitude converter and a power converter for generating the plurality of input data sets based on the plurality of Doppler filter outputs. 21. The moving target detector of claim 2, wherein the Doppler filter bank module comprises a clear Doppler filter bank, and a clutter Doppler filter bank, wherein the clear Doppler filter bank is operational when the current range cell is at a range greater than a maximum transition range value at a corresponding azimuth segment in a transition range value table, otherwise the clutter Doppler filter bank is operational. 22. The moving target detector of claim 1, wherein the no-land-clutter path is configured to process data based on the strongest of the plurality of Doppler outputs prior to performing detection. 23. A method of processing input radar data to provide detection data, the method comprising: processing the input radar data to provide a plurality of Doppler outputs for a current range cell; determining whether there is land clutter for the current range cell based upon clutter information; providing first detection results based upon the plurality of Doppler outputs using a land-clutter path when land clutter is detected for the current range cell; providing second detection results based upon the plurality of Doppler outputs using a no-land-clutter path when land clutter is not detected for the current range cell; and combining the first and second detection results across a plurality of range cells. 24. The method of claim 23, wherein providing the second detection results comprises: processing plurality of input data sets related to the plurality of Doppler outputs to provide peak output data by selecting the input data set having the largest power; video integrating the peak output data to provide video integrated data; and performing detection on the video integrated data for generating the second detection results. 25. The method of claim 24, wherein the method further comprises performing second time around target suppression for reducing erroneous detection results in the second detection results. 26. The method of claim 24, wherein the method further comprises reducing weather clutter in the plurality of input data sets prior to processing to provide the peak output data when weather clutter is detected. 27. The method of claim 24, wherein the detection comprises performing cell averaging Constant False Alarm Rate (CFAR) detection based on an early range and late range average with peaks edited threshold, a scaled no-land-clutter dynamic clutter map value for pixel threshold, a digital sensitivity time control map based on minimum cross section threshold, and a geo-censor map threshold. 28. The method of claim 24, wherein the clutter information is stored in a transition range value table which includes at least one transition range value for each azimuth segment of the radar data. 29. The method of claim 28, wherein the method comprises using the no-land-clutter path when the current range cell is at a range greater than a maximum transition range value at a corresponding azimuth segment in the transition range value table. 30. The method of claim 28, wherein the method comprises using the no-land-clutter path when the current range cell is at a range greater than an odd number of transition range values at a corresponding azimuth segment in the transition range value table. 31. The method of claim 28, wherein the method comprises obtaining the at least one transition range value for one of the azimuth segments from range values for cells at a corresponding azimuth segment in a clutter map having a clutter level less than a clutter threshold. 32. The method of claim 31, wherein the method comprises using a dynamic clutter map for the clutter map when anomalous propagation is detected, and using a clear day clutter map for the clutter map otherwise. 33. The method of claim 28, wherein the at least one transition value for one of the azimuth segments is obtained by selecting a maximum of: a first maximum range value for a clear day clutter map cell at a corresponding azimuth segment having a first clutter level larger than a first threshold, a second maximum range value for a dynamic clutter map cell at the corresponding azimuth segment having a clutter level larger than a second threshold plus the first clutter level, and a third maximum range value for a dynamic weather map cell at the corresponding azimuth segment having a clutter level larger than a third threshold. 34. The method of claim 24 further comprising: comparing a clutter level in a cell corresponding to the current range cell of a clutter map having the clutter information stored therein to a clutter threshold; in response to the clutter level of the current range cell being larger than the clutter threshold, selecting the land-clutter path; and in response to the clutter level of the current range cell being less than or equal to the clutter threshold, selecting the no-land-clutter path. 35. The method of claim 34, wherein the method comprises using a dynamic clutter map for the clutter map when anomalous propagation is detected, and using a clear day clutter map for the clutter map otherwise. 36. The method of claim 24, wherein the clutter information comprises a clear day clutter map, a dynamic clutter map and a dynamic weather map, and the method comprises performing thresholding on each of the maps, combining the thresholding results and using one of the no-land-clutter path and the land-clutter path based on the combined thresholding result. 37. The method of claim 36, wherein the method comprises using the no-land clutter path when a first clutter level in a clear day clutter map cell corresponding to the current range cell is less than a first threshold, a second clutter level in a dynamic day clutter map cell corresponding to the current range cell is less than a second threshold plus the first clutter level, and a third clutter level in a dynamic weather map cell corresponding to the current range cell is less than a third threshold. 38. The method of claim 36, wherein the method comprises using the no-land clutter path when a first clutter level in a clear day clutter map cell corresponding to the current range cell is less than a first threshold, a second clutter level in a dynamic day clutter map cell corresponding to the current range cell is greater than a second threshold plus the first clutter level, and a third clutter level in a dynamic weather map cell corresponding to the current range cell is greater than a third threshold and less than a fourth threshold. 39. The method of claim 24, wherein providing the first detection results comprises: performing CFAR detection on the plurality of input data sets to provide plurality of CFAR outputs; processing the plurality of CFAR outputs to select the largest CFAR output; and providing the first detection results by processing plurality of selected largest CFAR outputs to indicate a detection when a minimum proportion of the plurality of selected largest CFAR outputs indicate a detected target. 40. The method of claim 39, wherein the CFAR detection comprises employing the greatest of CFAR technique based on an early range with peak edited threshold, a late range average with peak edited threshold, a scaled dynamic clutter map value for pixel threshold, a digital sensitivity time control map based on minimum cross section threshold, and a geo-censor map threshold. 41. The method of claim 39, wherein the method further comprises performing one of magnitude conversion and power conversion for generating the plurality of input data sets based on the plurality of Doppler filter outputs. 42. The method of claim 24, wherein the method comprises using one of a clear Doppler filter bank, and a clutter Doppler filter bank to provide the plurality of Doppler outputs, wherein the clear Doppler filter bank is used when the current range cell is at a range greater than a maximum transition range value at a corresponding azimuth segment in a transition range value table, otherwise the clutter Doppler filter bank is used. 43. The method of claim 23, wherein the method comprises processing data based upon the strongest of the plurality of Doppler outputs prior to performing detection when the no-land-clutter path is used. 44. A computer readable medium for processing input radar data to provide detection data, the computer readable medium having program code stored thereon, the program code executable by a processor for implementing a method comprising: processing the input radar data to provide a plurality of Doppler outputs for a current range cell; determining whether there is land clutter for the current range cell based upon clutter information; providing first detection results based upon the plurality of Doppler outputs using a land-clutter path when land clutter is detected for the current range cell; providing second detection results based on the plurality of Doppler outputs using a no-land-clutter path when land clutter is not detected for the current range cell; and combining the first and second detection results across a plurality of range cells. 45. A moving target detector for processing input data to perform detection for a current range cell, the moving target detector comprising: a Doppler filter bank module for processing the input data to provide a plurality of Doppler outputs for the current range cell; a no-land-clutter path for processing plurality of input data sets related to the plurality of Doppler outputs to provide second detection data by performing peak selection on each of the plurality of input data sets and performing detection on the results of the peak selection; a land-clutter path for processing the plurality of input data sets to provide first detection data by performing Constant False Alarm Rate (CFAR) detection on each of the plurality of input data sets and merging the detection results; and a switching logic module for selecting one of the land-clutter path and the no-land-clutter path based on clutter information.