WO-2026094230-A1 - SENSING SYSTEM, TRANSMISSION DEVICE, PROGRAM, AND SENSING METHOD

Abstract

A transmission device comprises: an optical signal generation unit that generates an optical signal; an amplitude-phase designation unit that splits the optical signal generated by the optical signal generation unit into a plurality of optical signals, and specifies the amplitude and the phase of each of the plurality of optical signals resulting from the splitting; a plurality of signal conversion units that convert the plurality of optical signals, for which the amplitude and the phase have been specified by the amplitude-phase designation unit, into a plurality of electrical signals; and a plurality of transmission antennas that wirelessly transmit the plurality of electrical signals into which the plurality of signal conversion units have made the conversion.

Inventors

• SUZUOKI KOSUKE
• HIRAGA KEN
• ITO HONOKA
• KUDO RIICHI
• OTA SHOKI

Assignees

• ＮＴＴ株式会社

Dates

Publication Date

20260507

Application Date

20241031

Claims (4)

1. A sensing system comprising a transmitting device and a receiving device, The transmitting device is An optical signal generation unit that generates optical signals, The optical signal generated by the optical signal generation unit is split into multiple optical signals, and the amplitude phase specification unit specifies the amplitude phase of each of the multiple branched optical signals. The amplitude-phase specification unit comprises a plurality of signal conversion units that convert the plurality of optical signals with specified amplitude-phase into a plurality of electrical signals, Multiple transmitting antennas that wirelessly transmit the multiple electrical signals converted by the multiple signal conversion units, Equipped with, The receiving device is, Multiple receiving antennas for wirelessly receiving the multiple electrical signals transmitted from the multiple transmitting antennas, A sensing information acquisition unit that acquires information about an object to be sensed based on the plurality of electrical signals received by the plurality of receiving antennas, A sensing system equipped with [a specific feature].
2. An optical signal generation unit that generates optical signals, The optical signal generated by the optical signal generation unit is split into multiple optical signals, and the amplitude phase specification unit specifies the amplitude phase of each of the multiple branched optical signals. The amplitude-phase specification unit comprises a plurality of signal conversion units that convert the plurality of optical signals with specified amplitude-phase into a plurality of electrical signals, Multiple transmitting antennas that wirelessly transmit the multiple electrical signals converted by the multiple signal conversion units, A transmitting device equipped with the following features.
3. To the computer of the transmitting device, The process of generating optical signals, The optical signal generated in the optical signal generation process is divided into a plurality of optical signals, and the amplitude phase specification process is used to specify the amplitude phase of each of the plurality of branched optical signals. The amplitude-phase specification process includes a signal conversion process that converts the plurality of optical signals with specified amplitude-phases into a plurality of electrical signals, A wireless transmission process in which the multiple electrical signals converted in the signal conversion process are wirelessly transmitted from multiple transmitting antennas, A program that executes the command.
4. A sensing method using a transmitting device and a receiving device, The aforementioned transmitting device performs an optical signal generation process that generates an optical signal, The transmitting device divides the optical signal generated in the optical signal generation process into a plurality of optical signals, and performs an amplitude phase specification process to specify the amplitude phase of each of the plurality of divided optical signals. The transmitting device includes a signal conversion process in which, in the amplitude-phase specification process, the plurality of optical signals with specified amplitudes and phases are converted into a plurality of electrical signals, The transmitting device performs a wireless transmission process in which it wirelessly transmits the multiple electrical signals converted in the signal conversion process from multiple transmitting antennas, The receiving device performs a wireless reception process in which it wirelessly receives the multiple electrical signals transmitted from the multiple transmitting antennas using multiple receiving antennas, The receiving device performs a sensing information acquisition process in which it acquires information about a sensing target based on the plurality of electrical signals received during the wireless reception process, A sensing method having

Description

Sensing system, transmitting device, program, and sensing method This invention relates to a sensing system, a transmitting device, a program, and a sensing method. Conventionally, a sensing system is known that obtains information about an object to be sensed by transmitting a wireless signal from a transmitting device to the object to be sensed, receiving the wireless signal that has passed through the object with a receiving device, and analyzing the received signal (Non-Patent Document 1). The resolution of conventional sensing systems is proportional to the aperture area of the transmitting antenna and the frequency used. Therefore, by arranging multiple transmitting antennas to virtually expand the antenna area, and by using radio waves in the higher frequency band, high-resolution sensing systems are achieved. In conventional sensing systems, a transmitting device adds weights to multiple wireless signals and transmits them from its transmitting antenna. The receiving device then converts the weight information attached to the wireless signals into channel information to perform sensing of the target object. This is a schematic block diagram showing the configuration of a sensing system according to the first embodiment of the present invention.This figure shows an example of an optical signal output from the weighting unit to the photomixer.This figure shows an example of an optical signal output from the weighting unit to the photomixer.This figure shows an example of an optical signal output from the weighting unit to the photomixer.This figure shows an example of an optical signal output from the weighting unit to the photomixer.This is a flowchart showing the first process performed by the sensing system according to the first embodiment of the present invention.This is a flowchart showing a second process performed in a sensing system according to the first embodiment of the present invention.This is a sequence diagram showing the processing performed by the sensing system according to the first embodiment of the present invention.This is a schematic block diagram showing the configuration of a sensing system according to a second embodiment of the present invention.This is a schematic block diagram showing the configuration of a sensing system according to a third embodiment of the present invention.This is a schematic block diagram showing the configuration of a sensing system according to a fourth embodiment of the present invention. The first to fourth embodiments of the present invention will be described below with reference to the drawings. First, the first embodiment of the present invention will be described. [First Embodiment] First, a first embodiment of the present invention will be described. Figure 1 is a schematic block diagram showing the configuration of a sensing system 1000a according to a first embodiment of the present invention. The sensing system 1000a includes a transmitting device 100a and a receiving device 200a. In the first embodiment, a sensing object 300a is placed between the transmitting device 100a and the receiving device 200a. At least a portion of the wireless signal transmitted from the transmitting device 100a passes through the sensing object 300a and is received by the receiving device 200a. The transmitting device 100a comprises an optical signal generation unit 10a, a weighting unit 11a (also referred to as an amplitude phase specification unit), photomixers 12a-1, 12a-2, ..., 12a-M (where M is an integer of 2 or more), and transmitting antennas 13a-1, 13a-2, ..., 13a-M. The optical signal generation unit 10a generates an optical signal to be transmitted from the transmitting device 100a to the receiving device 200a and outputs it to the weighting unit 11a. The weighting unit 11a splits the single optical signal generated by the optical signal generation unit 10a into M optical signals. The weighting unit 11a then assigns weights to the M branched optical signals by controlling them to have identical or different amplitude phases, and outputs the M weighted optical signals to the photomixers 12a-1, 12a-2, ..., 12a-M. Weighting can be performed using any means, such as differences in path length, phase shifters, matrix circuits, or temperature response. Figures 2A and 2B show an example of an optical signal output from the weighting unit 11a to the photomixer 12a-1. As shown in Figure 2A, the weighting unit 11a outputs a predetermined carrier wave A1 and an optical signal A2 existing at a frequency f1 away from the carrier wave A1 to the photomixer 12a-1. The photomixer 12a-1 converts the optical signal into an electrical signal through intensity modulation, etc., generating an electrical signal with a frequency corresponding to the frequency difference between optical signals A1 and A2, and a phase condition corresponding to the phase difference. For example, Figure 2B shows an example where the electrical signal generated from optical signals A1 and A2