Abstract: A method that allows a space vehicle to determine navigation information represented by the contents of a state vector. The method includes the steps of intermittently receiving navigation signals, initializing the state vector with an estimate of the navigation information, and generating a predicted state vector that represents the predicted values for the navigation information after a predetermined time increment in the future. The method further determines whether a navigation signal has been received within a predetermined window of time from a navigation beacon. If a navigation signal has been received, the method updates the state vector and the contents of the state vector are propagated forward in time to provide an estimate of the navigation information after a predetermined time increment. In some instances, however, a navigation signal is not received within the predetermined window of time.

Abstract: A relay pilot regulator for use in combination with a main regulator in a gas distribution system, the gas distribution system including an inlet conduit supplying gas at an inlet pressure and an outlet conduit for delivering gas at a reduced outlet pressure, the main regulator including a main valve controlling gas flow from the inlet conduit to the outlet conduit and thereby also controlling the outlet pressure, a main regulator diaphragm mechanically linked to the main valve and a loading chamber the loading pressure in which acts on the main regulator diaphragm wherein the loading pressure positions the main regulator diaphragm and the main valve, the relay pilot regulator providing and controlling the loading pressure in the loading chamber.

Abstract: There is disclosed herein a diaphragm-operated gas regulator in which the diaphragm and valve operating means are protected against being damaged when subjected to excessive force resulting from excessively high pressure in the gas chamber of the regulator due to malfunctioning of the regulator.

Abstract: There is disclosed a gas pressure regulator having valving means comprising an orifice sleeve slidably mounted in a bushing which is located in an aperture in a dividing wall in the regulator casing located between the inlet and outlet means of the regulator, for movement toward and from a stationary upstream valve seat carried by the bushing to regulate the flow of fuel gas from the inlet through the regulator to the outlet thereof. To monitor the flow of gas through the meter the bushing has a valve seat adapted to be engaged by a valve operated by a valve stem to control the pressure of the gas at the outlet of the regulator and to shut off the flow of gas into the diaphragm chamber when the pressure of the gas exceeds a predetermined value and the regulating valve for some cause fails to stop the flow of gas.