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公开(公告)号：US10917173B2
公开(公告)日：2021-02-09
申请号：US16579914
申请日：2019-09-24
Applicant: Massachusetts Institute of Technology
Inventor： Ryan Wallace Kingsbury , Kathleen Michelle Riesing , Kerri Cahoy , Tam Nguyen Thuc Nguyen , David O. Caplan
IPC: H04B10/00 , H04B10/118 , H04B7/185
Abstract: Communication bottlenecks, particularly in the downlink direction, are a common problem for many CubeSat developers. As described herein, a CubeSat module for a CubeSat comprises an optical transmitter to transmit data to a remote terminal, a receiver to acquire an optical beacon from a remote terminal, and a fine-pointing module operably and directly coupleable to a coarse-pointing module of the CubeSat. The fine-pointing module is configured to point the optical transmitter toward the remote terminal with an accuracy range that overlaps with an accuracy range of the coarse-pointing module of the CubeSat so as to establish a communications link between the CubeSat and the remote terminal over a low-Earth-orbit (LEO) distance.
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公开(公告)号：US10826609B2
公开(公告)日：2020-11-03
申请号：US16447648
申请日：2019-06-20
Applicant: Massachusetts Institute of Technology
Inventor： Kerri Cahoy , Christian Haughwout , James Clark , Paula do Vale Pereira
Abstract: A beam steering system for a free-space laser communication system in a satellite includes a laser that emits a laser beam, a liquid lens assembly with at least one liquid lens to change the direction of the laser beam, and an amplifying optic to amplify the change in direction of the laser beam. The beam steering system may be used to steer a laser beam transmitted to another satellite or received from another satellite. In one example, a satellite may include two beam steering systems, disposed at opposing ends of a frame, where each steering system is configured to cover a hemisphere such that together, the steering systems can transmit and/or receive a laser beam over a 4π steradian sphere. The beam steering system may include a transmit feedback system and a reception system to monitor the direction and signal of the transmitted beam and the received beam, respectively.
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Patent Agency Ranking
公开(公告)号：US20240262538A1
公开(公告)日：2024-08-08
申请号：US18558021
申请日：2022-05-03
Applicant: Kerri Cahoy , Christian Haughwout , Paul Serra , Ruonan HAN , Anantha CHANDRAKASAN , Massachusetts Institute of Technology
Inventor： Kerri Cahoy , Christian Haughwout , Paul Serra , Ruonan HAN , Anantha CHANDRAKASAN
Abstract: Femto-satellites are very small satellites that can be deployed in constellations from a larger mothership satellite for distributed measurement. They are too small to accommodate the GNSS receivers that many satellites use for navigation, but they can be located with an electromagnetic beam from the mothership satellite. The mothership satellite scans this beam across a constellation of femto-satellites. When the beam scans across a particular femto-satellite, the femto-satellite transmits an acknowledgement to the mothership satellite, e.g., by retroreflecting the beam or via a separate radio link. The beam can be modulated with commands for the femto-satellite, such as to make a measurement or transmit previously acquired data, as well with commands for determining the femto-satellite's location, such as a time stamp or beam pointing information. The femto-satellite can determine its location from the information modulated onto the beam or transmit the time stamp to the mothership satellite for localization.
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公开(公告)号：US11296787B2
公开(公告)日：2022-04-05
申请号：US17187726
申请日：2021-02-26
Applicant: Massachusetts Institute of Technology
Inventor： Kerri Cahoy , Paul Serra , Ondrej Cierny
Abstract: A monostatic, beaconless fiber transceiver for free-space optical links infers fine tracking information using receiver optoelectronics and an injected pointing dither (nutation). A MEMS steering mirror fine-points the beams and injects the nutation. While this may disturb fiber coupling and transmit beam pointing, link loss becomes negligible for sufficient SNR. The SNR for links without point-ahead correction is about 35 dB to keep dither loss below 0.1 dB and RMS spatial tracking noise below a tenth of the beam divergence. Since the pointing and tracking bandwidth is much smaller than the receiver communication bandwidth, this SNR is achievable with appropriate filtering. For point-ahead correction, a single-mode fiber transceiver can reach up to about 1 beamwidth of correction, while a few-mode fiber transceiver can reach up to about 1.75 beamwidths due to improved coupling sensitivity at higher point-ahead offsets. Using a double-clad fiber with a secondary detector further reduces the incurred coupling loss.
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公开(公告)号：US20250074629A1
公开(公告)日：2025-03-06
申请号：US18951856
申请日：2024-11-19
Applicant: Massachusetts Institute of Technology
Inventor： Kerri Cahoy , Christian Haughwout , Paul Serra , Ruonan HAN , Anantha CHANDRAKASAN
Abstract: Femto-satellites are very small satellites that can be deployed in constellations from a larger mothership satellite for distributed measurement. They are too small to accommodate the GNSS receivers that many satellites use for navigation, but they can be located with an electromagnetic beam from the mothership satellite. The mothership satellite scans this beam across a constellation of femto-satellites. When the beam scans across a particular femto-satellite, the femto-satellite transmits an acknowledgement to the mothership satellite, e.g., by retroreflecting the beam or via a separate radio link. The beam can be modulated with commands for the femto-satellite, such as to make a measurement or transmit previously acquired data, as well with commands for determining the femto-satellite's location, such as a time stamp or beam pointing information. The femto-satellite can determine its location from the information modulated onto the beam or transmit the time stamp to the mothership satellite for localization.
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公开(公告)号：US12179942B2
公开(公告)日：2024-12-31
申请号：US18558021
申请日：2022-05-03
Applicant: Massachusetts Institute of Technology
Inventor： Kerri Cahoy , Christian Haughwout , Paul Serra , Ruonan Han , Anantha Chandrakasan
Abstract: Femto-satellites are very small satellites that can be deployed in constellations from a larger mothership satellite for distributed measurement. They are too small to accommodate the GNSS receivers that many satellites use for navigation, but they can be located with an electromagnetic beam from the mothership satellite. The mothership satellite scans this beam across a constellation of femto-satellites. When the beam scans across a particular femto-satellite, the femto-satellite transmits an acknowledgement to the mothership satellite, e.g., by retroreflecting the beam or via a separate radio link. The beam can be modulated with commands for the femto-satellite, such as to make a measurement or transmit previously acquired data, as well with commands for determining the femto-satellite's location, such as a time stamp or beam pointing information. The femto-satellite can determine its location from the information modulated onto the beam or transmit the time stamp to the mothership satellite for localization.
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公开(公告)号：US20200021361A1
公开(公告)日：2020-01-16
申请号：US16579914
申请日：2019-09-24
Applicant: Massachusetts Institute of Technology
Inventor： Ryan Wallace KINGSBURY , Kathleen Michelle RIESING , Kerri Cahoy , Tam Nguyen Thuc NGUYEN , David O. CAPLAN
IPC: H04B10/118
Abstract: Communication bottlenecks, particularly in the downlink direction, are a common problem for many CubeSat developers. As described herein, a CubeSat module for a CubeSat comprises an optical transmitter to transmit data to a remote terminal, a receiver to acquire an optical beacon from a remote terminal, and a fine-pointing module operably and directly coupleable to a coarse-pointing module of the CubeSat. The fine-pointing module is configured to point the optical transmitter toward the remote terminal with an accuracy range that overlaps with an accuracy range of the coarse-pointing module of the CubeSat so as to establish a communications link between the CubeSat and the remote terminal over a low-Earth-orbit (LEO) distance.
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