A geopositioning system. The geopositioning system includes an accelerometer including three sensing axes, a gyroscope including three sensing axes, and a magnetometer including three sensing axes, and a processing circuit. The processing circuit is configured to calculate a location of the geopositioning system as a latitude, longitude, and altitude with respect to the Earth.

Aspects of the present disclosure relate to generation of a semi-coherent gravitational wave beam and related apparatus, systems, and methods, such as for at least gravitational wave communication. In one or more embodiments, a gravitational wave generator includes a generator frame, and a first rotatable mass mounted to the generator frame. The first rotatable mass is rotatable about a generator axis and rotatable relative to the generator frame to generate one or more gravitational waves. The gravitational wave generator includes one or more wave guide stages that include two or more guide assemblies. The two or more guide assemblies each include a guide frame, and a second rotatable mass mounted to the guide frame. The second rotatable mass is rotatable about a guide axis and rotatable relative to the guide frame to at least partially focus the one or more gravitational waves into one or more collimated beams.

Aspects of the present disclosure relate to methods, systems, and apparatus for wireless gravitational wave communication. In one or more embodiments, a method of wireless gravitational wave communication includes generating one or more gravitational wave signals at a first site. The generating of the one or more gravitational wave signals includes rotating and/or angularly accelerating one or more rotatable masses at a plurality of states. The method includes transmitting the one or more gravitational wave signals to a receiver in a wireless manner, and receiving the one or more gravitational wave signals at a second site using the receiver. The method includes determining (such as by decoding) information from the one or more gravitational wave signals.

Aspects of the present disclosure relate to methods, systems, and apparatus for wireless gravitational wave communication. In one or more embodiments, a method of wireless gravitational wave communication includes generating one or more gravitational wave signals at a first site. The generating of the one or more gravitational wave signals includes rotating and/or angularly accelerating one or more rotatable masses at a plurality of states. The method includes transmitting the one or more gravitational wave signals to a receiver in a wireless manner, and receiving the one or more gravitational wave signals at a second site using the receiver. The method includes determining (such as by decoding) information from the one or more gravitational wave signals.

Various implementations disclosed herein include devices, systems, and methods for pose estimation using one point correspondence, one line correspondence, and a directional measurement. In various implementations, a device includes a non-transitory memory and one or more processors coupled with the non-transitory memory. In some implementations, a method includes obtaining an image corresponding to a physical environment. A first correspondence between a first set of pixels in the image and a spatial point in the physical environment is determined. A second correspondence between a second set of pixels in the image and a spatial line in the physical environment is determined. Pose information is generated as a function of the first correspondence, the second correspondence, and a directional measurement.

Various implementations disclosed herein include devices, systems, and methods for pose estimation using one point correspondence, one line correspondence, and a directional measurement. In various implementations, a device includes a non-transitory memory and one or more processors coupled with the non-transitory memory. In some implementations, a method includes obtaining an image corresponding to a physical environment. A first correspondence between a first set of pixels in the image and a spatial point in the physical environment is determined. A second correspondence between a second set of pixels in the image and a spatial line in the physical environment is determined. Pose information is generated as a function of the first correspondence, the second correspondence, and a directional measurement.

The present invention discloses a method for determining an inverse of gravity correlation time. During data processing on gravity measurement of moving bases, a gravity anomaly is considered as a stationary random process in a time domain, and is described with a second-order Gauss Markov model, a third-order Gauss Markov model or an m.sup.th-order Gauss Markov model, and the inverse of gravity correlation time is an important parameter of the gravity-anomaly model, and according to a gravity sensor root mean square error, a Global Navigation Satellite System (GNSS) height root mean square error, an a priori gravity root mean square, and a gravity filter cutoff frequency during the gravity measurement of the moving bases, an inverse of gravity correlation time of the second-order, third-order or m.sup.th-order Gauss Markov model is determined. According to the method for determining an inverse of gravity correlation time provided in the present invention, a forward and backward Kalman filter during data processing on gravity measurement of moving bases can be adjusted, to obtain a high-precision and high-wavelength-resolution gravity anomaly value.

The present invention discloses a method for determining an inverse of gravity correlation time. During data processing on gravity measurement of moving bases, a gravity anomaly is considered as a stationary random process in a time domain, and is described with a second-order Gauss Markov model, a third-order Gauss Markov model or an m.sup.th-order Gauss Markov model, and the inverse of gravity correlation time is an important parameter of the gravity-anomaly model, and according to a gravity sensor root mean square error, a Global Navigation Satellite System (GNSS) height root mean square error, an a priori gravity root mean square, and a gravity filter cutoff frequency during the gravity measurement of the moving bases, an inverse of gravity correlation time of the second-order, third-order or m.sup.th-order Gauss Markov model is determined. According to the method for determining an inverse of gravity correlation time provided in the present invention, a forward and backward Kalman filter during data processing on gravity measurement of moving bases can be adjusted, to obtain a high-precision and high-wavelength-resolution gravity anomaly value.

Provided herein may be a storage device and a method of operating the same. A storage device for protecting the storage device from physical movement may include a nonvolatile memory device, a sensor unit configured to collect information about physical movement of the storage device, and a memory controller configured to perform a device lock operation of protecting data in the nonvolatile memory device, based on a sensor value acquired from the sensor unit.

Provided herein may be a storage device and a method of operating the same. A storage device for protecting the storage device from physical movement may include a nonvolatile memory device, a sensor unit configured to collect information about physical movement of the storage device, and a memory controller configured to perform a device lock operation of protecting data in the nonvolatile memory device, based on a sensor value acquired from the sensor unit.