摘要:
A system for providing mobile interactive satellite services includes a satellite operable to communicate with mobile units, a terrestrial base transceiver station operable to communicate with mobile units, and a ground station in communication with the satellite and the terrestrial base transceiver station to provide mobile interactive satellite services. The mobile interactive satellite services include a multicast component and an interactive component such that the ground station provides both the multicast component and the interactive component using the satellite, with the terrestrial base transceiver station used to provide an ancillary terrestrial component. A device for communicating with a mobile interactive satellite service system includes an antenna, a transceiver coupled to the antenna and operable to communicate with a mobile interactive satellite service system, a user input device, an output device, a processor unit, and a network interface. The processor unit is coupled to the user input device, the output device, and the transceiver such that the processor is operable to output received information from the transceiver using the output device, to receive interactive information from the user input device, and to transmit data based on the received interactive information using the transceiver. The network interface is coupled to the processor such that the processor is operable to side load information.
摘要:
A transceiver (10) for transmitting and receiving satellite RF signals is provided. The transceiver (10) includes RF front-end receiver circuitry (20) capable of receiving FM radio broadcast RF signals and converting the FM radio broadcast RF signals to an intermediate frequency. The RF front-end receiver circuitry (20) is configured to receive RF signals at greater than 108 MHz and convert the RF signals to an intermediate frequency. The transceiver (10) also includes signal processing circuitry (40) including at least one DSP core (42) for demodulating intermediate frequency signals provided by the front-end circuitry (20) and for modulating data to be transmitted into baseband modulated data signals, and at least one audio output (46). The transceiver (10) further includes RF transmitter circuitry (30) configured to convert the baseband modulated data signals provided by the at least one DSP core (42) into modulated transmit signals having a frequency greater than 108 MHz for transmission and transmit the modulated transmit signals.
摘要:
A method for deep paging in a communication system employing orthogonal channelizing codes, such as Walsh sequences, of predetermined length m , that does not require a high powered paging channel. The method includes the steps of generating a paging channel message which is combined with a Walsh sequence having a length greater than or equal to 2 m , and transmitting the paging channel message at a data rate of less than 480 bits per second (bps). By transmitting the paging channel message at a low data rate and integrating collected energy over a period longer by a factor on the order of 1000, the message is able to penetrate buildings and other structures or high attenuation environments, thereby allowing one to successfully page a user terminal that is inside such a structure or area. Preferably, the paging channel message is formed using an auxiliary Walsh sequence on the order of 65536 chips in length, and the data rate is less than 10 bps.
摘要:
A paging network having at least one paging transmitter and receiver site (Base 1) for transmitting paging messages and for receiving acknowledgments, the paging network, comprising: a timing control unit for timing said paging transmissions and for activating receive processing channels; a plurality of directive antennas (80) coupled to associated receive signal processing means for receiving signals from respective antennas and converting said signals to corresponding complex numerical samples at times determined by said timing control unit; a memory for storing said complex numerical samples; and processing means (81) for processing said complex numerical samples from respective antenna elements (80) in a plurality of ways corresponding to different possible directions and times of arrival of said acknowledgments from a plurality of said pagers in order to improve detection of said acknowledgments.
摘要:
Die vorliegende Erfindung schlägt ein Verfahrung zur verbesserten Erfassung und Verarbeitung von verkehrstelematischen Daten, insbesondere zur Erfassung von Verkehrsprofilen auf Straßen und Autobahnen zwecks Iststandsanalyse und daraus resultierender Verkehrsprognose und Verkehrslenkung vor, wobei die Datenerfassung vorzugsweise durch satellitengestützte Erfassungssysteme erfolgt. Dabei entfällt insbesondere die Installation der erdgebundenen Verkehrssensoren samt der mit Installation und Wartung einhergehenden Probleme. Das vorgeschlagene Verfahren erlaubt im Gegensatz zur erdgebundenen Sensorlösungen zusätzlich die bedarfsgerechte dynamische Konfiguration der geografischen Einsatzgebiete.
摘要:
A satellite-based, world-wide cellular messaging system transmits paging messages to pagers via multiple beams. A message unit monitors multiple beams, recording the visit information for each beam, and ultimately determines the optimum beam to monitor for messages. The message unit, which conserves battery resources by entering into a sleep mode, synchronizes quickly to its message block when it awakes.
摘要:
An apparatus for providing a call interception capability includes a master call intercept (60, 62) database storing records of subscribers of a global mobile satellite communications system (50, 52) targeted for call interception by law enforcement agencies. The apparatus also has a visitor location register storing records of subscribers currently registered within a serviceable vicinity of a gateway earth station associated with said visitor location register. The apparatus further includes a target database storing records of registered subscribers targeted for call interception, and an intercept coordinator communicating with the master call intercept database and the visitor location register. The intercept coordinator stores in the target database a record of a targeted subscriber, when the visitor location register includes a corresponding record of the targeted subscriber. The intercept coordinator optionally removes a record of a targeted subscriber from the target database, when the visitor location register does not include a record of the targeted subscriber.
摘要:
In a satellite communication system, a method of unobtrusively intercepting a communication call includes establishing a first connection (132) to originate from a first satellite subscriber (101) (SU) and terminate at a first node (161) at a first transcoder (160), establishing a second connection (134) to originate from a second node (172) at a second transcoder (170) and terminate at a second SU (101), switching the first connection (132) to originate from the first SU (101) and terminate at a third node (171) at the second transcoder (170), passing a first information carried by the first connection (132) at the third node (171) to the second connection (134) at the second node (172). The first information without substantial delay or processing is transmitted by the second connection (134) to be received by the second SU (110). The first information may be decoded in a decoder portion of the second transcoder (170) to produce a first decoded information (142). The first decoded information (142), accordingly, may unobtrusively be monitored.
摘要:
A location reporting satellite paging communication system comprising space satellites (2), ground stations (4), and call receivers (8) adapted to resolve a global position from signals transmitted from satellites (2) and earth based communication means (4). The call receiver (8) or callee in possession of the call receiver updates the paging network with a global position as requested by the paging network (6). A caller paging a subscriber or callee (8) in possession of the call receiver may request the global location of the callee. The paging network (6) could divulge or block such information from a caller depending on the requirements of the subscriber.
摘要:
In a messaging system, message traffic is transmitted on one or more traffic channels (T1, T2 ) and the allocation of groups (S1, S2 ) of receivers to the traffic channels (T1, T2 ) is controlled by information transmitted on a bulletin board channel (BB). A predetermined number of frames before a change in the traffic channel allocation, a countdown value is transmitted in the relevant traffic channel (T1) and the countdown value is decremented in each subsequent frame. Before the countdown value reaches zero, the groups of receivers (S1, S2) retune to the bulletin board channel, receive their new channel allocations and retune to the traffic channel indicated for their group. The frame timings of the different traffic channels (T1, T2 ) are staggered to reduce the peak power required to transmit message bursts in these channels.