Abstract A system for storing and retrieving the outputs of inertial sensors (accelerometers) and of other appropriate quantities such as EM Log Data (velocity reference), time, gimbal angle information and depth gauge data (depth reference aboard a submarine) of an inertial system, in order to be able to continue navigation with reasonable accuracy at some future time after a system failure without the need of external information to reinitialize the solution of the navigation problem. The system comprises an inertial measuring unit (IMU), a navigation computer, a memory unit, and an electronic switching and timing unit. Sensor information from the inertial measuring unit (IMU) is stored temporarily during non-availability of the navigation computer. The sensors of the inertial measuring unit continue to supply information for storage during the time the navigation computer is inoperative without requiring command and/or control information from the computer. The navigation computer processes the sensor information stored during its failure at a rate faster than that of real time data processing until it has processed all of the stored sensor information. The navigation computer goes into its normal processing mode thereafter. Thus accurate navigation is continued without the submarine coming to the surface for resets (reference information).
A ships inertial navigation storage and retrieval system comprising: an inertial measuring unit; a first plurality of buffer registers, said first plurality registers being connected to the output of said inertial measuring unit; a navigation computer, said computer being connected to said inertial measuring unit for transferring inertial information from said inertial measuring unit to said navigation computer via said first plurality of buffer registers and said navigation computer having the capability of different rates of information processing and processing velocity, depth, and position information; a second plurality of buffer registers, said second plurality of registers being connected to said navigation computer for transferring processed navigation information from said navigation computer to said second plurality of buffer registers; a multiplexing unit, said multiplexing unit being connected to said first plurality and to said second plurality of buffer registers; a timing and synchronization unit connected to said multiplexing unit and said first plurality and second plurality of buffer registers, and being interconnected to said navigation computer; a memory unit connected to said multiplexing unit and interconnected to said timing and synchronization unit; a magnetic tape control unit connected to said navigation computer, said memory unit, and said timing and synchronization unit; and a plurality of magnetic tape units connected to said magnetic tape control unit.
Claim 2
Dependent Claim
214 words
A ships inertial navigation storage and retrieval system comprising: an inertial measuring unit; a first plurality of buffer registers, said first plurality registers being connected to the output of said inertial measuring unit; a navigation computer, said computer being connected to said inertial measuring unit for transferring inertial information from said inertial measuring unit to said navigation computer via said first plurality of buffer registers and said navigation computer having the capability of different rates of information processing and processing velocity, depth, and position information; a second plurality of buffer registers, said second plurality of registers being connected to said navigation computer for transferring processed navigation information from said navigation computer to said second plurality of buffer registers; a multiplexing unit, said multiplexing unit being connected to said first plurality and to said second plurality of buffer registers; a timing and synchronization unit connected to said multiplexing unit and said first plurality and second plurality of buffer registers, and being interconnected to said navigation computer; a memory unit connected to said multiplexing unit and interconnected to said timing and synchronization unit; a magnetic tape control unit connected to said navigation computer, said memory unit, and said timing and synchronization unit; and a plurality of magnetic tape units connected to said magnetic tape control unit.
Claim 3
Dependent Claim
20 words
The system of claim 1 wherein said memory unit includes an address unit and a buffer core memory store unit.