An atom interferometer system includes a sensor cell comprising alkali metal atoms. An optical system generates first and second interrogation beams having respective first and second frequencies and a circular polarization. The optical system includes optics that provide the first and second interrogation beams through the sensor cell in a first direction and reflect the first and second interrogation beams back through the sensor cell in a second direction opposite the first direction and in a same circular polarization to drive the alkali metal atoms from a first energy state to a greater energy state during an interrogation stage of sequential measurement cycles. A detection system detects a state distribution of a population of the alkali metal atoms between the first energy state and the second energy state during the interrogation stage based on an optical response.

The invention discloses a preferable short arc orbit determining method based on Gauss solution cluster, and belongs to the astrodynamics field, including: grouping the observation data, using Gauss method to obtain the target state vector at the corresponding time point for each group of data, forming a solution set of preliminary estimation; dividing the solution set of preliminary estimation into a position component vector solution set and a velocity component vector solution set for clustering to obtain a position component vector solution cluster and a velocity component vector solution cluster; based on the position component vector solution cluster and the velocity component vector solution cluster, generating a two-dimensional trajectory solution set; evaluating each of the two-dimensional trajectories by using a trajectory optimal method, calculating the number of root of orbits corresponding to the optimal two-dimensional trajectory, thereby completing determination of initial orbit.

Implementations of various methods and systems to transform navigation routes with two waypoints or a destination waypoint or a series sequence of waypoints into objects which are communities to which user(s) may subscribe, friend, follow or be a member of the community. The present disclosed invention relates to combining the concepts of objected oriented programming and navigation systems and social networking and transportation as a fungible asset class or transportation as an open market.

A method for directly planning a reentry trajectory in a height-velocity profile includes the following steps: S1, extracting an actual working parameter of an aircraft, setting the maximum value {dot over (Q)}.sub.max of a stagnation point heat flux, the maximum value q.sub.max of dynamic pressure, and the maximum value n.sub.max of overload according to the mission requirement, and solving the height-velocity boundary of the reentry trajectory, that is, a lower boundary of the reentry trajectory in the height-velocity profile; S2, solving a reentry trajectory of an initial descent stage according to differential equations of reentry motion, and determining a starting point of a trajectory of a gliding stage according to the trajectory of the initial descent stage; and S3, planning a trajectory in the height-velocity profile satisfying terminal constraints based on the lower boundary in the height-velocity profile, and calculating a corresponding bank angle, to obtain the reentry trajectory.

A star scanner is provided that uses miniaturized high-speed electronics and an ultra-compact freeform optical design. The star scanner reduces instrument volume, reduces power consumption, and reduces costs, relative to existing star scanners. The optics can be used with a credit card-like footprint, electronics sensor board with optimally packed electronics.

A star scanner is provided that uses miniaturized high-speed electronics and an ultra-compact freeform optical design. The star scanner reduces instrument volume, reduces power consumption, and reduces costs, relative to existing star scanners. The optics can be used with a credit card-like footprint, electronics sensor board with optimally packed electronics.

A reconnaissance rover configured for multiple agile and autonomous landings over a small body or moon. The reconnaissance rover comprises a detection unit, a processing unit, a control unit and a drive unit. The detection unit is configured to detect at least an environment in front of the reconnaissance rover, in the direction of a trajectory of the reconnaissance rover over a surface of the small body or moon. The detection unit is further configured to provide environmental data based on the detected environment. The processing unit is configured to update the trajectory based upon the provided environmental data. The control unit interacts with the drive unit to move the reconnaissance rover according to the updated trajectory.

A reconnaissance rover configured for multiple agile and autonomous landings over a small body or moon. The reconnaissance rover comprises a detection unit, a processing unit, a control unit and a drive unit. The detection unit is configured to detect at least an environment in front of the reconnaissance rover, in the direction of a trajectory of the reconnaissance rover over a surface of the small body or moon. The detection unit is further configured to provide environmental data based on the detected environment. The processing unit is configured to update the trajectory based upon the provided environmental data. The control unit interacts with the drive unit to move the reconnaissance rover according to the updated trajectory.

A pulsar-based timing and lateration system includes a detector system. In according with certain embodiments, the detector system includes a plurality of detectors, each one configured for detecting X-ray photons and generating output signals according to the X-ray photons detected, and an electronics unit for receiving and analyzing the output signals from the detectors. The electronics unit includes a processor for analyzing the output signals received from the detectors. A first detector is aimed toward a first pulsar such that the X-ray photons detected at the first detector includes pulsar signals from the first pulsar. The processor includes a memory for storing a library of data related to electromagnetic emissions of known pulsars. The processor isolates the pulsar signals from the first pulsar, and determines position and velocity of the system by comparing the isolated pulsar signals to the library of data.

A pulsar-based timing and lateration system includes a detector system. In according with certain embodiments, the detector system includes a plurality of detectors, each one configured for detecting X-ray photons and generating output signals according to the X-ray photons detected, and an electronics unit for receiving and analyzing the output signals from the detectors. The electronics unit includes a processor for analyzing the output signals received from the detectors. A first detector is aimed toward a first pulsar such that the X-ray photons detected at the first detector includes pulsar signals from the first pulsar. The processor includes a memory for storing a library of data related to electromagnetic emissions of known pulsars. The processor isolates the pulsar signals from the first pulsar, and determines position and velocity of the system by comparing the isolated pulsar signals to the library of data.