IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0466925
(2009-05-15)
|
등록번호 |
US-8253621
(2012-08-28)
|
발명자
/ 주소 |
|
출원인 / 주소 |
- Lockheed Martin Corporation
|
대리인 / 주소 |
Howard IP Law Group, P.C.
|
인용정보 |
피인용 횟수 :
9 인용 특허 :
4 |
초록
▼
A radar volume in a cued direction is searched with sequential pencil beams. The cued direction is subject to uncertainty in the form of covariance. The covariance defines an ellipse rotated relative to the azimuth axis. Before determining the extent of the acquisition face, the ellipse is projected
A radar volume in a cued direction is searched with sequential pencil beams. The cued direction is subject to uncertainty in the form of covariance. The covariance defines an ellipse rotated relative to the azimuth axis. Before determining the extent of the acquisition face, the ellipse is projected onto a viewplane normal to the radar range axis, and rotated so the principal axes are parallel with the traverse and elevation directions. The acquisition face is then found. The number of beams required to scan the search volume is determined. In one embodiment, the search volume is sent to the radar, and the radar rotates the beams to their correct positions. The beams are then scheduled.
대표청구항
▼
1. A method for searching an angular region of a search volume, said method comprising the steps of: acquiring error information relating to a cue direction;from said error information, determining azimuth and elevation extents of the search volume about the cue direction;determining an angular exte
1. A method for searching an angular region of a search volume, said method comprising the steps of: acquiring error information relating to a cue direction;from said error information, determining azimuth and elevation extents of the search volume about the cue direction;determining an angular extent of each radar beam in azimuth and elevation;from said angular extents in azimuth and elevation for each radar beam, determining a number of beams for covering an acquisition face of said search volume;determining a dwell time for each of the radar beams given a search range;multiplying said number of beams by the dwell time per beam to establish a search time;comparing said search time with a maximum allowable search time;initiating radar scanning over said acquisition face if said search time is less that said maximum allowable search time; andpartitioning said search face into sub-search-faces if said search time is greater than said maximum allowable search time, and for each of said sub-search-faces, initiating radar scanning;wherein said step of determining the azimuth and elevation extents of the search volume about the cue direction includes the step of projecting a covariance onto a viewplane of the radar, which viewplane is normal to a range vector of the radar. 2. A method according to claim 1, wherein said step of initiating radar scanning over said acquisition face includes the step of rotating eigenvectors of the projection of the covariance to align the principal axes of the projection with traverse and elevation axes of the viewplane. 3. A method for searching an angular region of a radar search volume, said method comprising the steps of: acquiring error information relating to a cue direction;from said error information, determining azimuth and elevation extents of the search volume about the cue direction;determining an angular extent of each of a plurality of radar beams in azimuth and elevation;from said angular extents in azimuth and elevation for each beam, determining a number of beams for covering an acquisition face of said search volume;determining a dwell time for each of the beams given a search range;multiplying said number of beams by the dwell time per beam to thereby establish a search time;comparing said search time with a maximum allowable search time;initiating radar scanning over said acquisition face if said search time is less that said maximum allowable search time; andpartitioning said search face into sub-search-faces if said search time is greater than said maximum allowable search time, and for each of said sub-search-faces, initiating radar scanning;wherein said step of determining azimuth and elevation extents of the search volume about the cue direction includes the steps of: projecting a covariance as an ellipse onto a viewplane of the radar; anddetermining rotation angle, and rotating the projected covariance ellipse by the rotation angle, so that eigenvectors are parallel to azimuth and elevation axes of the viewplane. 4. A method according to claim 3, wherein said step of initiating radar scanning over said acquisition face includes the step of rotating each beam position through a negative of said rotation angle prior to scanning. 5. A method for searching an angular region of a radar search volume about a cued direction, said method comprising the steps of: acquiring error information relating to said cued direction;from said error information, determining azimuth and elevation extents of the search volume about the cue direction;determining an angular extent of each of a plurality of radar beams in azimuth and elevation;from said angular extents in azimuth and elevation for each beam, determining number of beams for covering an acquisition face of said search volume;determining a dwell time for each of the beams given a search range;multiplying said number of beams by the dwell time per beam to establish a search time;comparing said search time with a maximum allowable search time;initiating radar scanning over said acquisition face if said search time is less that said maximum allowable search time; andpartitioning said search face into sub-search-faces if said search time is greater than said maximum allowable search time, and for each of said sub-search-faces, initiating radar scanning;wherein said step of determining azimuth and elevation extents of the search volume about the cue direction includes the steps of: a) projecting a covariance onto a viewplane of the radar, where said viewplane is in a plane normal to a radar range vector, to thereby generate a projected covariance; andb) determining a covariance rotation angle and rotating the projected covariance so that principal axes of the projected covariance are aligned with traverse/elevation axes of the viewplane; andwherein said step of initiating radar scanning over said acquisition face if said search time is less than said maximum allowable search time includes the steps of: c) sending the covariance rotation angle to the radar along with acquisition volume parameters; andd) rotating a search beam through a negative of the covariance rotation angle prior to scanning. 6. A method for searching an angular region of a search volume with sequentially applied radar beams, the method comprising: determining extents of the search volume about a cue direction;determining angular extents of each beam;from the angular extents of each beam, determining a number of beams required to cover an acquisition face of the search volume;determining a dwell time for each of the beams;determining a search time using the number of beams and the dwell time for each of the beams;comparing the search time with a maximum allowable search time; andinitiating radar scanning over the acquisition face if the search time is less that the maximum allowable search time. 7. A method according to claim 6, further comprising: partitioning the acquisition face into sub-acquisition-faces if the search time is greater than the maximum allowable search time; andfor each of the sub-acquisition-faces, initiating radar scanning. 8. A method according to claim 6, wherein said search volume encloses a target identified by a cooperating radar. 9. A method according to claim 6, wherein said search time is a product of the number of beams and the dwell time per beam. 10. A method according to claim 6, wherein the step of determining extents of the search volume about the cue direction includes projecting a covariance onto a viewplane of the radar, where said viewplane is in a plane normal to a radar range vector, to generate a projected covariance; and determining a covariance rotation angle and rotating the projected covariance so that principal axes of the projected covariance are aligned with traverse/elevation axes of the viewplane. 11. A method according to claim 6, wherein said step of initiating radar scanning over said acquisition face if said search time is less than said maximum allowable search time includes sending the covariance rotation angle to the radar along with acquisition volume parameters; and rotating a search beam through a negative of the covariance rotation angle prior to scanning. 12. A method according to claim 6, wherein said step of extents of the search volume comprises determining azimuth and elevation extents of the search volume. 13. A system for searching an angular region of a search volume with sequentially applied radar beams, the system comprising: a processor executing instructions for performing the steps of; determining extents of the search volume about a cue direction;determining angular extents of each beam;from the angular extents of each beam, determining a number of beams required to cover an acquisition face of the search volume;determining a dwell time for each of the beams;determining a search time using the number of beams and the dwell time for each of the beams;comparing the search time with a maximum allowable search time; andinitiating radar scanning over the acquisition face with the determined number of beams if the search time is less that the maximum allowable search time. 14. A system according to claim 13, wherein the processor executes instructions for performing the further steps of: partitioning the acquisition face into sub-acquisition-faces if the search time is greater than the maximum allowable search time; andfor each of the sub-acquisition-faces, initiating radar scanning. 15. A system according to claim 13, wherein said search volume encloses a target identified by a cooperating radar. 16. A system according to claim 13, wherein said search time is a product of the number of beams and the dwell time per beam. 17. A system according to claim 13, wherein the step of determining extents of the search volume about the cue direction includes projecting a covariance onto a viewplane of the radar, where said viewplane is in a plane normal to a radar range vector, to generate a projected covariance; and determining a covariance rotation angle and rotating the projected covariance so that principal axes of the projected covariance are aligned with traverse/elevation axes of the viewplane. 18. A system according to claim 13, wherein said step of initiating radar scanning over said acquisition face if said search time is less than said maximum allowable search time includes sending the covariance rotation angle to the radar along with acquisition volume parameters; and rotating a search beam through a negative of the covariance rotation angle prior to scanning. 19. A system according to claim 13, wherein said step of extents of the search volume comprises determining azimuth and elevation extents of the search volume.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.