A system and method for providing wireless data communication between a wireless communication system in an aircraft and a stationary communication server outside the aircraft are disclosed. The wireless communication system includes a router network connected to a plurality of antennas, wherein the router network is configured to transmit and receive wireless data communication to and from a stationary communication server outside said aircraft through at least one ground base station via said antennas. The router network includes a plurality of connectivity nodes being physically separated and distributed within the aircraft, the connectivity nodes being connected to each other via a bus, and each connectivity node including a control unit, at least one modem, and preferably a plurality of modems, and a connection to at least one of the antennas. Further, each antenna is connected only to one of the connectivity nodes.

The present disclosure relates to a method and a device for monitoring the water volume change, and a computer device and a storage medium. The method includes: acquiring a lake shoreline change sequence, a lake area change sequence, and a combined altimetry water level sequence; obtaining a lake water level sequence based on the combined altimetry water level sequence and the lake shoreline change sequence; calculating a first regressive relationship between the lake water volume and the lake water level based on the lake area change sequence and the lake water level sequence; and obtaining a lake water volume change sequence based on the lake water level sequence and the first regressive relationship between the lake water volume and the lake water level.

Systems and methods for measuring velocity and acceleration with a radar altimeter. In certain embodiments, a method for measuring velocity magnitude of a platform in relation to a surface includes transmitting a radar beam, wherein the radar beam is aimed toward a surface. The method also includes receiving a plurality of reflected signals, wherein the plurality of reflected signals correspond to portions of the transmitted radar beam that are reflected by a plurality of portions of the surface. Further, the method includes applying Doppler filtering to the plurality of signals to form at least one Doppler beam. Also, the method includes identifying range measurements within each Doppler beam in the at least one Doppler beam. The method further includes calculating one or more coefficients of the Taylor expansion of the velocity magnitude based on the range measurements of the at least one Doppler beam.

In one aspect, a system for monitoring field profiles may include a vision-based sensor configured to capture vision data indicative of a profile of a field, with the profile being at least of a crop canopy profile of the field or a soil surface profile of the field. The system may also include a secondary sensor configured to capture secondary data indicative of the profile of the field. Furthermore, a controller of the disclosed system may be configured to receive the vision data from the vision-based sensor and the secondary data from the secondary sensor. Moreover, the controller may be configured to determine a quality parameter associated with the vision data. Additionally, when the quality parameter falls below a minimum threshold, the controller may be configured to determine at least a portion of the profile of the field based on the secondary data.

Apparatus and methods of determining altitude information with a radar receiver with quadrature detection is provided. A method includes generating baseband frames. An oscillator signal is created within each of the baseband frames. A return of the oscillator signal is coupled to a first input of a mixer. Moreover, the oscillator signal is coupled to a second input of the mixer. A phase of the oscillator signal is selectively changed between two or more distinct values. Timing of the change being based at least in part on a baseband frame timing of the generated baseband frames. Samples of an output of the mixer are selectively collected further based at least in part on the baseband frame timing. The collected samples are processed to compute altitude information.

A system having components coupled to an aircraft and components remote from the aircraft processes radar-augmented data, transmits information between aircraft system components and/or remote system components, and dynamically determines locations and states of the aircraft, while the aircraft is in flight. Based on the locations and states of the aircraft, the system generates instructions for flight control of the aircraft toward a flight path appropriate to the locations of the aircraft, and can update flight control instructions as new data is received and processed.

A proximity sensor for a Laser Guided Bomb (LGB) is provided. A proximity sensor for a Laser Guided Bomb (LGB) includes: an electronics package unit (EPU) configured to be connected to a front end of a warhead; and at least one sensor separate from the EPU and configured to be connected to a forward adapter that is connected to the front end of the warhead. The at least one sensor is configured to obtain data that is used to determine a height above ground of the LGB. The EPU is configured to compare the determined height above ground to a predefined value. The EPU is configured to generate a detonation signal for the warhead based on the determined height above ground being equal to or less than the predefined value.

A system to provide navigation solutions for vehicle landing guidance comprises onboard aiding sensors, an IMU, a radar altimeter, a map database, and a navigation system including a navigation filter that outputs estimated kinematic state statistics for the vehicle. An onboard processor inputs horizontal and vertical position statistics from the navigation filter into the map database, and computes an estimated ground/object height, ground/object velocity, ground/object acceleration, and error statistics thereof, based on terrain and object map data. The processer includes a radar altimeter inertial vertical loop (RIVL) filter that determines relative vertical acceleration based on a difference between vehicle vertical acceleration and ground/object vertical acceleration; determines relative vertical velocity based on a difference between vehicle vertical velocity and ground/object vertical velocity; performs consistency checks on the relative vertical acceleration and relative vertical velocity; and outputs estimated vehicle vertical position and vertical velocity statistics for compensation of the navigation filter outputs.

An aerial system and method of operating an aerial system is provided. The aerial system includes a body, a lift mechanism, a processing system, a camera, and a sensor module. The lift mechanism is coupled to the body and configured to controllably provide lift and/or thrust. The processing system is configured to control the lift mechanism to provide flight to the aerial system. The camera is coupled to the body and is configured to obtain images of an environment proximate the aerial system. The sensor module is coupled to the body and includes an emitter and a receiver. The receiver is configured to sense data related to an ambient environment associated with the aerial system. The processing system controls a controllable parameter of the lift mechanism or the emitter as a function of the sensed data.

The present disclosure provides an unmanned aerial vehicle (UAV) control method. The method includes controlling a microwave radar disposed on the UAV to transmit a microwave signal while rotating around a rotating shaft; acquiring a frequency of an intermediate frequency signal based on a frequency of the transmitted signal and a frequency of an echo signal; determining a distance between the UAV and a surrounding obstacle based on the frequency of the intermediate frequency signal; and adjusting a flight path of the UAV based on the distance between the UAV and the surrounding obstacle.