Abstract: A reception device includes a ball lens, a first light receiver including a first annular body surrounding a periphery of the ball lens, and light receiving units including first light receiving elements disposed on an inner peripheral side surface of the first annular body, and a second light receiver including a second annular body surrounding an outer periphery of the first annular body and second light receiving elements disposed on an outer peripheral side surface of the second annular body. The first light receiving elements are disposed on the inner peripheral side surface of the first annular body with the light receiving part facing the ball lens. The second light receiving elements are disposed on the outer peripheral side surface of the second annular body with the light receiving part facing in a direction opposite to the ball lens.

Abstract: A communication apparatus including a transmitter that transmits modulated light modulated by a modulation part of a spatial light modulator as a first spatial light signal, a receiver that receives a second spatial light signal transmitted from a communication target, a detector that detects a physical quantity related to oscillation of the own apparatus, and a communication control unit that acquires the physical quantity detected by the detector and information on oscillation of the communication target included in the second spatial light signal, analyzes a state of the oscillation of the communication target using the information on the oscillation of the communication target and the physical quantity, and sets a transmission condition of the first spatial light signal in the transmitter according to the analyzed state of the oscillation of the communication target.

Abstract: A free-space optical communication control system includes at least one processor. The at least one processor carries out: a first detection process of detecting a change in a connection relationship between a first free-space optical communication apparatus and a second free-space optical communication apparatus adjacent to the first free-space optical communication apparatus; a second detection process of detecting a transition of work stages in accordance with the change in the connection relationship detected and plan information indicating a connection relationship between the first free-space optical communication apparatus and the second free-space optical communication apparatus in each of the work stages; and a connection control process of controlling, according to the transition of the work stages detected, which connection destination is connected to the first free-space optical communication apparatus.

Abstract: A flying body identification system according to the present example embodiment includes: a flying body; a communication terminal configured to obtain an airframe ID of the flying body; and a control system configured to control an operation of the flying body. The control system is also configured to: manage the airframe ID and a plurality of pieces of information regarding the flying body indicated by the airframe ID so as to be associated with each other; select, in a case where an inquiry message containing the airframe ID and an authority level assigned to the communication terminal is received from the communication terminal, information to be transmitted to the communication terminal among the plurality of pieces of information regarding the flying body associated with the airframe ID in accordance with the authority level of the communication terminal; and transmit the selected information to the communication terminal.

Abstract: A light-receiving device that includes a condenser lens that condenses a spatial optical signal, a beam control element that emits an optical signal derived from the spatial optical signal condensed by the condenser lens toward a predetermined region, and a light-receiving element that is disposed with a light-receiving portion facing the predetermined region and receives the optical signal.

Abstract: A terminal control system causes a wireless terminal to perform a switching process of switching a connection destination of the wireless terminal in accordance with the wireless terminal being located at such a position as to be capable of establishing connection both with a wireless base station and with a free-space optical communication apparatus, acquires weather information regarding an area in which the wireless terminal is located, and causes, in accordance with the weather information, the wireless terminal to stop the switching process of switching the connection destination of the wireless terminal from the wireless base station to the free-space optical communication apparatus.

Abstract: A free space optical communication device includes: a plurality of light transmitting/receiving sections; and at least one processor configured to execute: a communication control process of controlling communication which is to be carried out via the plurality of light transmitting/receiving sections, in the communication control process, the at least one processor causing two or more light transmitting/receiving sections of the plurality of light transmitting/receiving sections to transmit same pieces of information in parallel according to respective different communication schemes.

Abstract: A management system for managing an upper free-space optical communication apparatus and a lower free-space optical communication apparatus that carry out free-space optical communication in an up-and-down direction is provided, the management system including at least one processor, the at least one processor carrying out: an acquisition process of acquiring a first index that indicates a quality of a first upward light signal received by the upper free-space optical communication apparatus; and a determination process of determining a possibility of contamination of a light sending and receiving window of the lower free-space optical communication apparatus in accordance with the first index, the lower free-space optical communication apparatus being configured to send and receive a light signal of the free-space optical communication through the light sending and receiving window.

Abstract: A communication system (1) includes a plurality of communication apparatuses (10) and a control apparatus (20), the plurality of communication apparatuses (10) each including: a communication means that is configured to be capable of transmitting and receiving directional communication media; a specification means that specifies at least one connection destination candidate by carrying out scanning with use of the communication means; and a connection establishment means that establishes connection with the at least one connection destination candidate specified by the specification means, and the control apparatus (20) including a control means that controls a meshed network composed of the plurality of communication apparatuses (10) connecting to each other.

Abstract: A communication system (1) includes a plurality of communication apparatuses (10) and a control apparatus (20), the control apparatus (20) including a control unit (21), the control unit (21) including: a management unit (22) that manages the number of established connections for each of the plurality of communication apparatuses (10); and an instruction unit (23) that instructs, in a case where at least one connection included in the established connections has been broken, the at least one communication apparatus (10) involved in the at least one broken connection to reestablish the at least one broken connection.

Abstract: A communication control system includes at least one processor executing: a main communication process of carrying out communication with one or more targets through an optical fiber line; a specifying process of specifying, from among the one or more targets, a free-space optical communication target based on communication statuses in the main communication process; a sub communication process of carrying out communication with the free-space optical communication target via a free-space optical communication apparatus(es); and a selecting process of selecting, according to at least one of (i) a capacity of the communication with the free-space optical communication target in the main communication process, (ii) the communication statuses of the free-space optical communication apparatuses, and (iii) processing capacities of the free-space optical communication apparatuses, a path for free-space optical communication with the free-space optical communication target in the sub communication process.

Abstract: A communication system (1) according to an example aspect of the present invention includes a plurality of communication apparatuses (10) and a control apparatus (20), the control apparatus (20) including a control unit (21), the control unit (21) including: an acquisition unit (22) that acquires related information related to the communication apparatuses (10) and reference information; and an accumulation unit (23) that calculates correlation between the related information and the reference information, and accumulates correlation information indicative of the calculated correlation.

Abstract: A free space optical communication device includes: a plurality of light transmitting/receiving sections; and at least one processor configured to execute: a communication control process of controlling communication which is to be carried out via the plurality of light transmitting/receiving sections, in the communication control process, the at least one processor (a) determining a required communication capacity for the communication and (b) controlling, on the basis of the required communication capacity, the number of light transmitting/receiving sections to be used for the communication.

Abstract: A free-space optical communication control system includes at least one processor. The at least one processor carries out: an interruption estimation process of estimating an interruption of free-space optical communication over a free-space optical communication network in accordance with movement route information that indicates a movement route of a mobile object movable within a communication area of the free-space optical communication network; and a path change process of changing a free-space optical communication path in accordance with an estimation result of the interruption estimation process.

Abstract: A communication system (1) includes a plurality of communication apparatuses (10) and a control apparatus (20), the control apparatus (20) including a control unit (21), the control unit (21) including a management unit (21a) that manages, for each of the plurality of communication apparatuses (10), the number of connections that are capable of being established, and the number of established connections.

Abstract: An air traffic control system (31) according to the present disclosure includes a communication unit (4) configured to receive, from a communication terminal (40), an image including a flying object (2) captured by the communication terminal (40) and position information about the communication terminal (40), an estimation unit (8) configured to estimate a position of the flying object (2) using background information and the position information included in the image, and an identification unit (5) configured to identify the flying object (2) using the estimated position of the flying object (2). The communication unit (4) transmits information about the identified flying object (2) to the communication terminal (40).

Abstract: A flying object according to example embodiments includes an airframe ID control unit configured to hold an airframe ID of the flying object changed according to a predetermined change pattern, and a communication unit configured to transmit the airframe ID. An air traffic control system according to the example embodiments includes a communication unit configured to acquire a first airframe ID and position information transmitted from a flying object, and an identification unit configured to identify the flying object using the first airframe ID. When the communication unit acquires a second airframe ID different from the first airframe ID after acquiring the first airframe ID, the identification unit determines whether or not the second airframe ID indicates the flying object based on a change between the position information at the time of acquiring the first airframe ID and the position information at the time of acquiring the second airframe ID.

Abstract: A communication apparatus (10) includes: at least one communication means (11) that is configured to be capable of transmitting and receiving directional communication media; a specification means (12) that specifies at least one connection destination candidate by scanning with use of the at least one communication means; and a connection establishment means (13) that establishes connection with the at least one connection destination candidate specified by the specification means.

Abstract: Please delete the Abstract of the Disclosure, and replace it with the following: A light-receiving device that includes a substrate which transmits light in the wavelength band of a spatial light signal to be received, an optical antenna which is disposed on a first surface of the substrate, which receives the spatial light signal, which optically guides signal light derived from the spatial light signal along the in-plane direction of the substrate toward an emission end, and which outputs the signal light from the emission end toward the substrate, and a light-receiving element which is disposed such that a light-receiving surface faces a second surface of the substrate opposite from the first surface, and which receives, at the light-receiving surface, the signal light output from the optical antenna.

Abstract: A communication system (1) includes a plurality of communication apparatuses (10) and a control apparatus (20), the control apparatus (20) including a control unit (21) including: a related information acquisition unit (22) that acquires related information related to the communication apparatuses; a connection request acquisition unit (23) that acquires a connection request from a new terminal; a determination unit (24) that determines a communication apparatus which is to be connected to the new terminal; and an instruction unit (25) that instructs the determined communication apparatus to carry out scanning with respect to the new terminal.