초록 ▼

In the method of multiple-station communication for low-orbit satellite systems, according to which service information modulated pseudirandom synchronization signals are emitted from a satellite transponder over the entire band of the transmission spectrum, information packets are received. from us

In the method of multiple-station communication for low-orbit satellite systems, according to which service information modulated pseudirandom synchronization signals are emitted from a satellite transponder over the entire band of the transmission spectrum, information packets are received. from user stations, mismatches by frequency and delay are measured, and the mismatches and information portions of the packets are memorized, they are reswitched and reemitted with spatial, frequency- and time-division multiplexing; all the user stations receive the synchronization signals and the information packets assigned to them, with the transmitters being autotuned by frequency and delay with multibase information encoding; there are provided high-orbit satellite transponders for integration with the low-orbit satellite transponders; search of signals and initial synchronization of channels owing to linear discrete scanning of the clock-frequency signals of the user station transmitters with compensation for the Doppler shift by the clock frequency, evaluations of the instants of correlation convolutions of the relayed signals with reference signals in two points by each user, calculation of the number of the scanning steps between the convolutions and evaluation of the delay introduced into the emitted signal.

대표청구항 ▼

[ I claim:] [1.] A method of multiple-station communication for low-orbit satellite systems, comprising the steps of transmitting by user stations synchronization signals and information-modulated signals, reswitching the information-modulated signals aboard a satellite transponder, and emitting the

[ I claim:] [1.] A method of multiple-station communication for low-orbit satellite systems, comprising the steps of transmitting by user stations synchronization signals and information-modulated signals, reswitching the information-modulated signals aboard a satellite transponder, and emitting thereof at different frequencies by spaced apart beams with the use of phase-shift keying, emitting by the transponder its own synchronization signal, receiving the synchronization signal from the satellite transponder by the user stations and the information-modulated signals meant therefor, characterized in that the method further comprises the steps of generating and emitting, at the satellite transponder, a wideband pseudorandom synchronization signal with phase-shift keying over the entire width of the transmission spectrum from the satellite transponder and over the entire service area divided into cells with the power density gradually increasing from the area center to the edges thereof, modulating said wideband pseudorandom synchronization signal with service information intended for control of the communications system, rejecting synchronization signal spectrum sections coincident, at the time of emission, with the spectrum of the signals emitted by the satellite transponder and carrying information, with the emitted power of the synchronization signal being constant, checking at the satellite transponder the location of all the user stations with respect to the spatial cells formed by the beams of an on-board antenna of the satellite transponder, receiving information packets from the user stations and storing the information portion thereof, determining from packet preambule the carrier-frequency and code-delay mismatches against standards disposed at the satellite transponder, with subsequent storage thereof, retrieving from a memory, shaping and emitting groups of information packets within preset time intervals, said information packets being meant to be transmitted into different spatial cells with preambles including mismatches for each user station, all the user stations performing reception of the synchronization signal from the satellite transponder and separation of service information with simultaneous rejection of the synchronization signal spectrum portion coincident with the spectrum of the signals carrying information from the spatial cell in which the particular user station is located, performing compensation for the Doppler shift in auto tune transmitters by the carrier and clock frequencies using the synchronization signal received from the satellite transponder, performing autotuning of the own transmitters by the carrier frequency and code delay using the mismatch values separated from said preamble, sending a query to the satellite transponder on the necessity of communication with other user stations by emitting, by the auto tuned transmitters, several cycles of a pseudorandom radio signal with the code assigned for the call of the satellite transponder with a delay individually preset for each of the user stations, identifying at the satellite transponder the number of the calling user station and the spatial cell in which it is disposed by the received call signal and its delay, and reporting by means of the calling party code the time interval allocated thereto and the internal code for two-way communication with the satellite transponder, the number of the called party identified at the satellite transponder with its coordinates and the spatial location cell being reported to the satellite transponder from the calling party within the time interval allocated thereto by modulating the internal code, and with the called user station being disengaged, a call arrives from the satellite transponder with the use of its subscriber's code, said call presetting at the same time the time interval and internal code for the two-way communication with the satellite transponder, performing the initial synchronization of the auto tune transmitter from the called user station after receiving a call from the satellite transponder, and reporting to the satellite transponder within the assigned time interval on readiness for communication by modulating the assigned internal code and thereafter separating at the satellite transponder and reporting to the two user stations the time. intervals and the numbers of the internal codes to establish two-way communication, the time intervals being allocated proceeding from the condition of convenience of routing the packets taking into consideration the cells of location of the user stations, establishing thereafter the internal codes in the transmitter and receiver at each user station, providing information shaping in a digital form and the time compression thereof, performing multibase encoding of the information by the allocated internal code and emitting of a signal within the assigned time interval with a preamble including several cycles of the internal code with a fixed delay, or several cycles of the code allocated to a group of user stations, and performing at the user stations separation of the packets intended therefor, demodulation, decompression and separation of information transmitted to the user stations.