초록 ▼

A method of determining an altitude of a flying object. A Blanchard altitude of a flying object is computed. A non-Blanchard reference altitude and a trajectory of the flying object are measured and input to a Kalman filter. In the Kalman filter, the non-Blanchard reference altitude and the trajecto

A method of determining an altitude of a flying object. A Blanchard altitude of a flying object is computed. A non-Blanchard reference altitude and a trajectory of the flying object are measured and input to a Kalman filter. In the Kalman filter, the non-Blanchard reference altitude and the trajectory are processed to derive a radius of jet stream curvature. A gradient wind correction factor is then computed as a function of the radius of jet stream curvature. The Blanchard altitude is then corrected in response to the gradient wind correction factor.

대표청구항 ▼

A method of determining an altitude of a flying object. A Blanchard altitude of a flying object is computed. A non-Blanchard reference altitude and a trajectory of the flying object are measured and input to a Kalman filter. In the Kalman filter, the non-Blanchard reference altitude and the trajecto

A method of determining an altitude of a flying object. A Blanchard altitude of a flying object is computed. A non-Blanchard reference altitude and a trajectory of the flying object are measured and input to a Kalman filter. In the Kalman filter, the non-Blanchard reference altitude and the trajectory are processed to derive a radius of jet stream curvature. A gradient wind correction factor is then computed as a function of the radius of jet stream curvature. The Blanchard altitude is then corrected in response to the gradient wind correction factor. a plurality of electrode configurations; determining cross-chamber capture thresholds for the plurality of electrode configurations; and automatically selecting an electrode configuration and stimulation energy level for the primary chamber stimulation based on the respective capture thresholds. 14. The method of claim 13, wherein the step of automatically selecting the electrode configuration comprises selecting an electrode configuration for capturing an atrium with minimal risk of causing capture of a ventricle. 15. The method of claim 13, wherein the step of automatically selecting the electrode configuration comprises selecting an electrode configuration for capturing a ventricle with minimal risk of causing capture of an atrium. 16. The method of claim 13, wherein the step of selecting the electrode configuration comprises selecting an electrode configuration that captures a left ventricle with minimal risk of causing capture of a left atrium. 17. The method of claim 13, wherein the step of selecting the electrode configuration comprises selecting an electrode configuration that captures a left atrium with minimal risk of causing capture of a left ventricle. 18. The method of claim 13, wherein the step of automatically selecting the electrode configuration comprises selecting an electrode configuration that results in a lowest primary capture threshold, and in a cross-capture threshold that exceeds the primary capture threshold by at least a predetermined amount. 19. The method of claim 15, further comprising delivering a ventricular stimulation pulse during a period when the atrium is not physiologically refractory. 20. A cardiac stimulation device capable of avoiding cross-chamber stimulation, comprising: a pulse generator that generates stimulation pulses; a lead system connected to the pulse generator, the lead system comprising: an atrial sense electrode that senses atrial cardiac signals; a ventricular sense electrode that senses ventricular cardiac signals; an atrial stimulation electrode that delivers atrial stimulation pulses to an atrium; and a ventricular stimulation electrode that delivers ventricular stimulation pulses to a ventricle; and a controller, connected to the lead system and pulse generator, that is responsive to signals from the respective sense electrodes to determine a primary chamber capture threshold for a plurality of electrode configurations, and that further determines cross-chamber capture thresholds for the plurality of electrode configurations, and wherein the controller automatically selects an electrode configuration for primary chamber stimulation based on the respective capture thresholds, such that a risk of cross-chamber stimulation is reduced. 21. The cardiac stimulation device of claim 20, wherein the electrode configuration captures an atrium with minimal risk of causing capture of a ventricle. 22. The cardiac stimulation device of claim 20, wherein the electrode configuration captures a ventricle with minimal risk of causing capture of an atrium. 23. The cardiac stimulation device of claim 20, wherein the electrode configuration results in a lowest primary chamber capture threshold, and in a cross-chamber capture threshold that exceeds the primary chamber capture threshold by at least a predetermined amount. 24. The cardiac stimulation device of claim 20, further comprising a memory that is operative to store a result of the respective capture threshold tests associated with each selected electrode configuration. 25. A cardiac stimulation device for selecting a stimulation energy level, comprising: means for determining a primary capture threshold of a primary chamber; means for determining a cross-chamber capture threshold of a second chamber; and means for selecting the stimulation energy level based on the respective capture thresholds. 26. The cardiac stimulation device of claim 25, wherein the means for selecting the stimulation energy selects a st