SYSTEM AND METHODS OF DETECTING LOSS OF SIGNAL IN FREE SPACE OPTICAL COMMUNICATIONS

    公开(公告)号:US20240333382A1

    公开(公告)日:2024-10-03

    申请号:US18128671

    申请日:2023-03-30

    IPC分类号: H04B10/079 H04B10/118

    CPC分类号: H04B10/0795 H04B10/118

    摘要: The present application at least describes a system for detecting loss in free space optical communications (FSOCs). The FSOC may include a sensor located downstream of the power supply unit. The FSOC may also include a signal conditioning unit (SCU) located downstream of the sensor. The FSOC may also include a comparator located downstream of the SCU. The comparator may be configured to receive the first signal from the SCU and determine an indication of signal loss based upon the first signal being below a predetermined threshold. The FSOC may further include a photodiode located downstream of the sensor. The photodiode may be configured to receive power from the power supply, receive an optical signal from a source, and output a second signal based on the optical signal.

    Systems and methods for predicting ionospheric electron content

    公开(公告)号:US11914047B2

    公开(公告)日:2024-02-27

    申请号:US17120414

    申请日:2020-12-14

    发明人: Isaac P. Moorman

    IPC分类号: G01S19/07 G06N3/08 G06N20/00

    CPC分类号: G01S19/072 G06N3/08 G06N20/00

    摘要: A system may be configured to predict total electron content (TEC) in an ionosphere. Some embodiments may: provide a machine learning (ML) model; obtain a dataset; input the dataset into the ML model; predict, for a predetermined number of days, the TEC using the ML model; and observe a performance improvement over the obtained dataset based on the prediction, the prediction being made for a region having a number of ground transmitters satisfying a sparseness criterion.

    POINT AHEAD OFFSET ANGLE FOR FREE SPACE OPTICAL NODES

    公开(公告)号:US20230006739A1

    公开(公告)日:2023-01-05

    申请号:US17944280

    申请日:2022-09-14

    IPC分类号: H04B10/118 H04B10/112

    摘要: A free space optical (FSO) communication node communicates via an FSO link with a remote FSO communication node that moves relative to the FSO node. The FSO node may be highly directional, and transmit (Tx) and receive (Rx) beams of the FSO node may share optical paths (at least in part). Instead of directing a Tx beam along a point ahead angle relative to a Rx beam (which may result in undesirable Rx coupling losses), the Tx beam is directed based on the point ahead angle and a point ahead offset angle. The point ahead offset angle modifies the point ahead angle to reduce Rx coupling losses while keeping Tx pointing losses at least low enough to maintain the FSO link. In some cases, due to the point ahead offset angle, the Tx direction minimizes a sum of the Rx coupling losses and the Tx pointing losses.

    METHODS AND SYSTEMS FOR DETECTING AND PASSIVELY MONITORING COMMUNICATIONS OF AN UNMANNED AERIAL VEHICLE

    公开(公告)号:US20220317275A1

    公开(公告)日:2022-10-06

    申请号:US17836011

    申请日:2022-06-09

    摘要: The present application at least describes a non-transitory computer readable medium including program instructions that when executed by a processor effectuate a set of actions. The program instructions include causing a scan of a radio frequency spectrum to detect one or more radio signals transmitted within a pre-defined area. The program instructions also include causing a capture of a radio signal of interest from the one or more radio signals. The program instructions also include demodulating the radio signal of interest to determine coded sensor data carried thereon. The program instruction further include decoding the coded sensor data to determine a characteristic of the sensor data. The program instruction further include generating an alert based on the characteristic of the sensor data.