15 results about "Satellite transmitter" patented technology

Timing adjustments or frequency offsets that at least partially compensate for Doppler shift (e.g., due to distance of a satellite transmitter or relative speed of a terrestrial receiver) of a signal, physical channel, or resource during wireless transmission are configured. The characteristics compensated comprise one of resource element (RE) mapping, channel state information reference signal (CSI-RS) configuration, bandwidth part (BWP) configuration, or control resource set (CORESET) configuration. Information indicating the multiple configurations is transmitted from a base station (BS) to at least one user equipment (UE). The timing adjustments or frequency offsets are specifically configured for one UE, a group of UEs, or the UEs served by a single serving cell. Joint transmission from multiple cells / TRPs / spotbeams may involve partial / full subcarrier alignment.

The invention discloses a system and method for satellite communication. Aspects of wireless communications are described including a radio frequency (RF) amplifier chip configured for transmitting or receiving data, the chip including a first substrate including a first material and a second substrate including a second material different from the first material. The first substrate and the second substrate may be lattice matched such that an interfacial region between the first substrate and the second substrate exhibits an sp3 carbon peak at about 1332 cm <-1 >, having a full width at half maximum of no greater than 5.0 cm <-1 >, as measured by Raman spectroscopy. In some aspects, the first substrate and the second substrate allow the chip to transmit or receive data at a transmission rate of at least 500 megabits per second and a frequency of at least 8 GHz. In some aspects, the RF amplifier chip is part of a satellite transmitter.

Satellite Transmitter and Communication System The present invention relates to a radio unit for a satellite communication system arranged for transmitting a waveform which bears data symbols on at least one carrier. The waveform is a non-slotted signal of at least 30 seconds. The radio unit is arranged for ramping up or down the power of the waveform to be transmitted according to a predefined power profile from a start power value to a target power value via at least one intermediate power value by adjusting at least one digital or analog variable gain setting. The radio unit comprises computation means to calculate the at least one digital or analog variable gain for the at least one intermediate power value to implement the predefined power profile to ramp up or down said power of the signal to be transmitted from the start power value towards the target power value. The predefined power profile is set by at least a parameter indicative of the adjustment speed of said at least one intermediate power value. The radio unit is part of a transmitter, which can be a single-carrier or multicarrier transmitter.

This invention discloses a RIS-assisted secure satellite-to-ground communication method under interference, belonging to the field of secure satellite-to-ground communication. The invention is used in a RIS-assisted secure satellite-to-ground communication system, including a satellite transmitter, a RIS, a UAV, a receiver, and multiple EVEs. The UAV is used to transmit harmful interference signals. With maximizing the secure rate as the objective, and constrained by satellite transmit power constraint CR1 and RIS constant modulus constraint CR2, a secure communication system optimization problem is constructed. By using maximizing the secure rate as the optimization objective, secure communication is ensured even with the worst-case receiver. The satellite transmit power constraint CR1 ensures effective transmission by the signal transmitter, and the RIS constant modulus constraint CR2 ensures signal reflection. The RIS constant modulus constraint CR2 and the objective function are deconvexized, and the deconvexized secure communication system optimization problem is jointly optimized to obtain the maximized secure rate, ensuring reliable and secure communication of the multi-user secure communication system even under noise uncertainty.

The present invention discloses a self-floating offshore drone, which includes a fuselage and wings. The wings are arranged on both sides of the fuselage, and vertical takeoff and landing arms are provided on both wings. The fuselage is made of carbon composite PVC foam material; the wings are made of Kevlar composite PVC foam material; the vertical takeoff and landing arms are made of 3K carbon fiber material; through material and airframe aerodynamic design, it is ensured that it can float on the water surface after falling into the water. It also discloses a water rescue system for triggering alarm, floating modeling analysis and command rescue operation of the drone falling into the water. The system includes a drone, a Beidou satellite transmitter, an AIS base station, a command terminal and multiple AIS ship terminals. The command terminal arranges ships for salvage nearby through modeling calculation and analysis according to the Beidou positioning information of the drone and the AIS identification information of the AIS ship terminals. The invention facilitates the search and rescue and salvage of the drone falling into the water, reduces the salvage cost, and the search and rescue process is safe and reliable.

In a non-geostationary orbit (NGSO) satellite mobile communication system, a communication device receives a synchronization signal block (SSB), which is subjected to partial pre-compensation, from an NGSO satellite transmitter through a downlink (DL) beam, and then transmits the received synchronization signal block (SSB) to the NGSO satellite transmitter through the downlink (DL) beam. And realizing cell synchronization with the NGSO satellite transmitter by using the SSB subjected to partial pre-compensation. A center frequency of a primary synchronization signal and a center frequency of a secondary synchronization signal within the partially pre-compensated SSB are pre-offset by the NGSO satellite transmitter by an integer number of subcarriers relative to a center frequency of the partially pre-compensated SSB to achieve a correlation with movement of the NGSO satellite transmitter relative to the coverage on the earth of the DL beam According to the method, partial pre-compensation of Doppler shift (DS) is carried out. Even if Doppler frequency offset is large due to high mobility of an NGSO satellite, cell synchronization can be simplified.

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 application relates to a pseudo-satellite ephemeris parameter design method based on Kalman filtering. The method comprises the following steps: a pseudo-satellite transmitter acquires a real-time position of the pseudo-satellite, a pre-set cruise standard route, and a standard cruise speed and a standard position of the pseudo-satellite on the cruise standard route, calculates a difference value between the real-time position at a signal transmission moment and the standard position, obtains a first difference value, performs Kalman filtering on the first difference value, fits to obtain ephemeris parameters, and broadcasts the ephemeris parameters to a user receiver through a pseudo-satellite signal; the user receiver receives the pseudo-satellite signal, obtains Kalman gain according to a maneuvering frequency of a pseudo-satellite motion model, obtains a second difference value according to the Kalman gain and the first difference value, and obtains a predicted position of the pseudo-satellite at a signal receiving moment according to the second difference value, the standard position and the standard cruise speed. The method can accurately represent the real-time position of the pseudo-satellite in the case that there is a difference between the real-time position of the pseudo-satellite and the standard cruise route.

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.

The present disclosure relates to a satellite deployer (100) made of a high performance polymer (HPP), said deployer (100) comprising an outer structure (102), a lid (104), and at least one access panel (106), wherein at least one satellite (108) is configured within the outer structure (102), said at least one satellite (108) being operatively coupled with an ejector plate (110) to enable said at least one satellite (108) to be launched from said deployer (100). The satellite deployer of the present disclosure has lighter weight, cost effective and a long shelf life.

The application relates to a pseudo-satellite ephemeris parameter design method based on a motion model. The method comprises the following steps: a pseudo-satellite transmitter acquires real-time position, real-time cruise speed, real-time cruise acceleration, a cruise standard route, a standard cruise speed and a standard position of the pseudo-satellite on the cruise standard route, calculates a difference value between the real-time position at a signal transmission moment and the standard position, obtains a first difference value, fits ephemeris parameters according to a history speed and acceleration of the pseudo-satellite in real-time cruise before the signal transmission moment, and broadcasts the ephemeris parameters to a user receiver through a pseudo-satellite signal; the user receiver receives the pseudo-satellite signal, obtains a second difference value according to the first difference value, a difference speed and a difference acceleration; and a predicted position of the pseudo-satellite at a signal receiving moment is obtained according to the second difference value, the standard position and the standard cruise speed. The method can calculate the position of the pseudo-satellite while fully considering the motion of the pseudo-satellite.

The invention discloses a satellite-ground downlink covert communication system and a satellite-ground downlink covert communication method combining beamforming and cooperative interference, which belong to the technical field of wireless communication, and are characterized in that the satellite-ground downlink covert communication is realized through the construction of a covert communication model based on the beamforming and cooperative interference technology in a satellite-ground downlink communication scene, the concealment calculation and the concealment rate calculation. The satellite-ground downlink covert communication system can obtain a covert rate greater than zero, and is composed of a multi-antenna satellite transmitter, a multi-antenna cooperation ground jammer, a single-antenna ground receiver and a single-antenna ground monitor. Transmitter-receiver transmission is performed by means of hidden beam forming, jammer-listener interference is performed by means of null-space beam forming, a hidden communication system can be efficiently supported in a satellite-ground system by means of the scheme of combining beam forming and cooperative interference, and a good effect is achieved.

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.

The application discloses a large-scale constellation network low-overhead space vector segmentation routing method, and mainly solves the problems of high routing overhead and reduced network performance in the prior art, and the scheme is as follows: inter-satellite and cross-layer links of different constellations are respectively established; the earth surface is divided into regions, and the satellite constellations are grouped according to the regions; in the same group, a medium-orbit satellite is taken as a controller of a low-orbit satellite, and is responsible for routing control and management of the low-orbit satellite; the low-orbit satellite checks the inter-satellite link with a neighbor satellite and the queue length of the inter-satellite transmitter of the low-orbit satellite; the medium-orbit satellite receives the link fault feedback information and the queue information report of the low-orbit satellite in the management range of the medium-orbit satellite, obtains regional topological state information, and calculates three routing tables of a single-layer region, an inter-region and a multi-layer inter-layer; the low-orbit satellite utilizes the three routing tables to perform different on-satellite routing forwarding according to the position relationship of a source satellite and a destination satellite. The application reduces routing overhead, improves network performance, and can be used for a large-scale constellation network.

Aspects of wireless communication are described, including a radiofrequency (RF) amplifier chip, configured for transmitting or receiving data, comprising a first substrate comprising a first material and a second substrate comprising a second material that is different from the first material. The first substrate and the second substrate may be lattice-matched such that an interface region between the first substrate and the second substrate exhibits an sp3 carbon peak at about 1332 cm·1 having a full width half maximum of no more than 5.0 cm·1 as measured by Raman spectroscopy. In some aspects, the first substrate and said second substrate permit said chip to transmit or receive data at a transfer rate of at least 500 megabits per second and a frequency of at least 8 GHz. In some aspects, the RF amplifier chip is part of a satellite transmitter.