IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0891002
(2001-06-25)
|
발명자
/ 주소 |
- Burgett, Scott
- Krull, Jay Dee
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
51 인용 특허 :
28 |
초록
▼
A navigation device and a method of calibrating the same are provided. The device includes a barometric pressure sensor and a GPS receiver. A processor calculates barometric and GPS derived altitudes and, based on a difference therebetween, corrects barometer altitude readings that would otherwise i
A navigation device and a method of calibrating the same are provided. The device includes a barometric pressure sensor and a GPS receiver. A processor calculates barometric and GPS derived altitudes and, based on a difference therebetween, corrects barometer altitude readings that would otherwise include drift errors. The processor uses a filter, such as a state feedback loop, to determine correction factors. The state feedback loop is adjustable to operate with different time constants. An error drift model is empirically determined and used to set the time constant. The time constant may be adjusted during operation based on a relation between the barometer correction quantity and an uncertainty in the vertical component of the GPS derived altitude. The method includes updating and recalibrating an atmospheric pressure model used to derive altitudes from the output of the barometric pressure sensor.
대표청구항
▼
A navigation device and a method of calibrating the same are provided. The device includes a barometric pressure sensor and a GPS receiver. A processor calculates barometric and GPS derived altitudes and, based on a difference therebetween, corrects barometer altitude readings that would otherwise i
A navigation device and a method of calibrating the same are provided. The device includes a barometric pressure sensor and a GPS receiver. A processor calculates barometric and GPS derived altitudes and, based on a difference therebetween, corrects barometer altitude readings that would otherwise include drift errors. The processor uses a filter, such as a state feedback loop, to determine correction factors. The state feedback loop is adjustable to operate with different time constants. An error drift model is empirically determined and used to set the time constant. The time constant may be adjusted during operation based on a relation between the barometer correction quantity and an uncertainty in the vertical component of the GPS derived altitude. The method includes updating and recalibrating an atmospheric pressure model used to derive altitudes from the output of the barometric pressure sensor. 3; US-4371746, 19830200, Pepper, 178/018; US-4374381, 19830200, Ng et al., 340/711; US-4379287, 19830400, Tyler et al., 340/365.C; US-4431882, 19840200, Frame, 200/005.A; US-4435616, 19840300, Kley, 178/018; US-4455452, 19840600, Schuyler, 178/018; US-4475235, 19841000, Graham, 382/003; US-4476463, 19841000, Ng et al., 340/712; US-4484038, 19841100, Dorman et al., 200/005.A; US-4523654, 19850600, Quayle et al., 178/019; US-4567470, 19860100, Yoshikawa et al., 340/365.C; US-4595913, 19860600, Aubuchon, 340/365.C; US-4600807, 19860700, Kable; US-4621257, 19861100, Brown, 340/365.P; US-4622437, 19861100, Bloom et al., 178/018; US-4623757, 19861100, Marino, 178/018; US-4639720, 19870100, Rympalski et al., 340/712; US-4649232, 19870300, Nakamura et al., 178/018; US-4649499, 19870300, Sutton et al., 364/518; US-4653086, 19870300, Laube, 379/096; US-4661655, 19870400, Gibson et al., 178/018; US-4675569, 19870600, Bowman et al., 310/328; US-4680429, 19870700, Murdock et al., 178/019; US-4680430, 19870700, Yoshikawa et al., 178/019; US-4684801, 19870800, Carroll et al., 250/221; US-4686332, 19870800, Greanias et al., 178/019; US-4687885, 19870800, Talmage et al., 178/018; US-4694279, 19870900, Meno, 340/347.P; US-4698460, 19871000, Krein et al., 178/019; US-4698461, 19871000, Meadows et al., 178/019; US-4707845, 19871100, Krein et al., 178/019; US-4731508, 19880300, Gibson et al., 178/018; US-4733222, 19880300, Evans, 340/365.C; US-4740781, 19880400, Brown, 340/712; US-4743895, 19880500, Alexander, 340/712; US-4755634, 19880700, Pepper, 178/018; US-4763356, 19880800, Day et al., 379/368; US-4777328, 19881000, Talmage et al., 178/018; US-4797514, 19890100, Talmage et al., 178/018; US-4806709, 19890200, Evans, 178/019; US-4822957, 19890400, Talmage et al., 178/018; US-4825212, 19890400, Adler et al., 340/706; US-4839634, 19890600, More et al., 340/712; US-4853498, 19890800, Meadows et al., 178/019; US-4873400, 19891000, Rapp et al., 178/019; US-4875036, 19891000, Washizuka et al., 340/784; US-4896223, 19900100, Todome, 358/468; US-4910504, 19900300, Eriksson, 340/712; US-4914624, 19900400, Dunthorn, 364/900; US-4922061, 19900500, Meadows et al., 178/019; US-4924222, 19900500, Antikidis et al., 341/033; US-4954823, 19900900, Binstead, 341/026; US-4958148, 19900900, Olson, 340/712; US-5016008, 19910500, Gruaz et al., 341/033; US-5027115, 19910600, Sato et al., 341/013; US-5053757, 19911000, Meadows, 340/712; US-5241308, 19930800, Young; US-5251123, 19931000, Reiffel et al.; US-5386219, 19950100, Greanias et al., 345/174; US-5771039, 19980600, Ditzik, 345/178 ted in the X-axis (horizontal) or the Z-axis (depth into the screen) of the rendered 3D surfaces. The rendered 3D surfaces represent the equation's dependent variable displayed in the Y-axis (vertical) plotted against two of the independent variables (rendered variables) of the equation displayed in the X-axis and the Z-axis. Animation of a surface is in response to modification of higher order independent variables (those variables not rendered in the X-axis and the Z-axis. Modification is accomplished using user interface elements, which modify values of the higher order variables of the super multivariate equation. Modified higher order variables are used to calculate new surface coordinates, which are then rendered to the display device replacing the previous surface and creating the effect of interactive animation. User interface elements are also provided to adjust the position of visible, movable markers on the surfaces. Digital read-outs display the value of the dependent variable and selected independent variables at marked points on the surfaces
※ AI-Helper는 부적절한 답변을 할 수 있습니다.