3 results about "Satellite transmitter" patented technology

This invention discloses a method for establishing satellite-to-ground QKD links in a low-Earth orbit quantum satellite network, belonging to the field of quantum communication technology. The invention includes: maintaining satellite-to-ground QKD links established in the previous time window with a real-time key generation rate higher than a threshold within the current time window; screening candidate satellite-to-ground QKD links based on visibility information, achievable key generation rate, and the number of idle QKD transceivers; determining and establishing the optimal satellite-to-ground QKD link based on a comparison of the number of idle quantum satellite transmitters with the number of candidate links, combined with the number of quantum satellites visible to each ground station within the current time window and the achievable key quantity of each candidate satellite-to-ground QKD link. This invention, by comprehensively considering link quality, equipment resource constraints, the number of quantum satellites visible to each ground station, and the achievable key quantity of each link, achieves dynamic and intelligent establishment of satellite-to-ground QKD links, effectively improving key production efficiency and key distribution balance, while reducing system overhead caused by frequent link switching.

The present invention discloses a two-way radio, typically a marine VHF radio, integrating a satellite distress alert transmitter, sharing much of the radio hardware with the satellite transmitter, while enabling good functionality of both, for search and rescue of people in distress.

This application relates to the field of satellite optical communication and remote sensing data transmission technology, and discloses a satellite non-domain remote sensing data backhaul method based on single-photon detection. This method generates a two-dimensional spatially encoded signal light field and an orthogonally polarized point-source reference pilot light field based on binary data at the satellite transmitter. These two fields are spatiotemporally combined and transmitted to a scattering channel. At the ground receiver, the light field is separated according to polarization state, and photons are collected using a single-photon array. An asymmetric time window is set based on the time statistics of the reference light field to filter the photon-generated signal and the reference speckle image. The channel point spread function is estimated using the reference speckle, and a deconvolution operation is performed on the signal speckle in the frequency domain to reconstruct the spatial pattern. The data is then demodulated by correlation matching with a standard basis pattern. This invention effectively suppresses diffuse noise and eliminates channel ambiguity through orthogonal pilot co-path transmission and time-domain gating, achieving highly robust data backhaul under strong scattering environments.