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公开(公告)号：US10819419B2
公开(公告)日：2020-10-27
申请号：US16518363
申请日：2019-07-22
摘要： A system and method for timing synchronization of satellite switching instants with gateway switching instants is described. The method includes: generating satellite switching instants according to a Beam Hopping Time Plan (BHTP); generating gateway switching instants according to the BHTP; transmitting a channel addressed to a plurality of beams hopped according to the BHTP based on the gateway switching instants, wherein each of the plurality of beams includes a signal including timing markers and a guard period at an end of the signal for the respective beam; receiving a synchronization information, without a loopback beam, for one of the plurality of beams; determining an adjustment period and an adjusted symbol rate for the generating of the gateway switching instants, based on the synchronization information, for a transmission of the channel such that at least a portion of the guard period in a respective signal for a respective beam aligns with one of the satellite switching instants; and adjusting a timing and a symbol rate of the transmission according to the adjustment period and the adjusted symbol rate, respectively.
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公开(公告)号：US10694479B2
公开(公告)日：2020-06-23
申请号：US15914058
申请日：2018-03-07
申请人： Murali Regunathan , Yezdi Antia , Neal David Becker , Stanley Kay , Uday R. Bhaskar , Seokho Kim
发明人： Murali Regunathan , Yezdi Antia , Neal David Becker , Stanley Kay , Uday R. Bhaskar , Seokho Kim
摘要： A system and method for timing synchronization with a modified DVB-S2X waveform for a forward beam hopping satellite is described. The method includes: transmitting a channel including a plurality of beams per a Beam Hopping Time Plan (BHTP), wherein each beam includes a discontinuous signal including a superframe including timing markers and a Beam Hopping Forward Synchronization Pattern (BHFSP); receiving a synchronization information, without a loopback beam, for one of the plurality of beams; determining an adjustment period and an adjusted symbol rate for generation of terrestrial switching instants, based on the synchronization information, for a transmission of the plurality of beams such that at least a portion of a respective BHFSP of one of the beams aligns with one of satellite switching instants; and adjusting a timing and symbol rate of the transmission according to the adjustment period and the adjusted symbol rate, respectively.
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公开(公告)号：US10361772B2
公开(公告)日：2019-07-23
申请号：US15914021
申请日：2018-03-07
摘要： A system and method for timing synchronization of satellite switching instants with gateway switching instants is described. The method includes: generating satellite switching instants according to a Beam Hopping Time Plan (BHTP); generating gateway switching instants according to the BHTP; transmitting a channel addressed to a plurality of beams hopped according to the BHTP based on the gateway switching instants, wherein each of the plurality of beams includes a signal including timing markers and a guard period at an end of the signal for the respective beam; receiving a synchronization information, without a loopback beam, for one of the plurality of beams; determining an adjustment period and an adjusted symbol rate for the generating of the gateway switching instants, based on the synchronization information, for a transmission of the channel such that at least a portion of the guard period in a respective signal for a respective beam aligns with one of the satellite switching instants; and adjusting a timing and a symbol rate of the transmission according to the adjustment period and the adjusted symbol rate, respectively.
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公开(公告)号：US07012937B2
公开(公告)日：2006-03-14
申请号：US09768728
申请日：2001-01-24
申请人： Bassel Beidas , Olga Ritterbush , Stanley Kay , Yezdi Antia , Bala Subramaniam
发明人： Bassel Beidas , Olga Ritterbush , Stanley Kay , Yezdi Antia , Bala Subramaniam
IPC分类号： H04J3/06
CPC分类号： H04J3/0611 , H04B7/2125 , H04J3/0605 , H04L7/0004 , H04L7/043 , H04L7/10
摘要： A method and system for tracking a time division multiplexed synchronization signal in a satellite communication system is provided. The signal is provided as a series of frames with beacon signals time division multiplexed into at least one time slot of each frame. The beacon signal in each frame comprises a unique word sequence, which is the same in each frame, and a portion of a PN sequence. The entire PN sequence is distributed into a plurality of frames forming a superframe. Frequency variations of the incoming signal are tracked at the satellite terminal by correlating the PN sequence of the incoming signal against early and late locally generated versions of the PN sequence in a discriminate circuit. The output of the discriminate is provided to a delay locked loop circuit of at least third order. The output of the loop is used to adjust the frequency of the VCO, which clocks the A/D converter operating on the incoming signal. The product of the PN sequence of the incoming signal and an on-time locally generated version of the PN sequence is provided to an FFT circuit. The satellite terminal determines if it is locked onto the incoming signal based on the output of the FFT. If the satellite terminal is not locked, the terminal returns to an acquisition mode.
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公开(公告)号：US07042854B2
公开(公告)日：2006-05-09
申请号：US09768726
申请日：2001-01-24
申请人： Bassel Beidas , Olga Ritterbush , Stanley Kay , Yezdi Antia , Bala Subramaniam
发明人： Bassel Beidas , Olga Ritterbush , Stanley Kay , Yezdi Antia , Bala Subramaniam
IPC分类号： H04B7/212
CPC分类号： H04J3/0611 , H04B7/2125 , H04L7/0004
摘要： A method and system for acquiring a time division multiplexed synchronization signal in a satellite communication system is provided. The signal is provided as a series of frames with beacon signals time division multiplexed into at least one time slot of each frame. The beacon signal in each frame comprises a unique word sequence, which is the same in each frame, and a portion of a PN sequence. The entire PN sequence is distributed into a plurality of frames forming a superframe. Initially, the power level of the incoming signal is determined by locating the maximum power received in half time slot intervals. Next a series of frames are correlated against the expected unique word, each at one of a plurality of possible frequencies. The frequency generating the maximum correlation with the unique word is selected. The frequency is fine tuned by comparing the actual arrival time of the unique word in each frame with the estimated arrival time based on the current frequency, and adjusting the frequency accordingly. Also, the start of the superframe is located by correlating the PN sequence portion of each beacon signal against a known PN sequence until a match is found. Once the frequency offset is reduced below a threshold value, and the start of the PN sequence of the incoming signal is located, acquisition is completed.
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公开(公告)号：US11632167B2
公开(公告)日：2023-04-18
申请号：US17691280
申请日：2022-03-10
申请人： Stanley Kay , Udaya Bhaskar , Neal David Becker
发明人： Stanley Kay , Udaya Bhaskar , Neal David Becker
摘要： A system and method for scheduling a variable stayout distance when beam hopping, the method including providing an illumination area of a satellite and candidate beam centers disposed in the illumination area; measuring a respective scan angle from an antenna boresight to a respective beam center of the candidate beam centers; and determining a reuse factor k for each of the candidate beam centers, based on a proportion of the respective scan angle to a maximum scan angle. Each candidate beam center may be processed sequentially. Prior to adding each candidate beam center to a current beam center set, checking whether a candidate beam center meets the stayout distance criteria from all beam centers already in the beam center set.
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公开(公告)号：US11309958B2
公开(公告)日：2022-04-19
申请号：US16729870
申请日：2019-12-30
申请人： Stanley Kay , Udaya Bhaskar , Neal David Becker
发明人： Stanley Kay , Udaya Bhaskar , Neal David Becker
摘要： A system and method for scheduling a variable stayout distance when beam hopping, the method including providing an illumination area of a satellite and candidate beam centers disposed in the illumination area; measuring a respective scan angle from an antenna boresight to a respective beam center of the candidate beam centers; and determining a reuse factor k for each of the candidate beam centers, based on a proportion of the respective scan angle to a maximum scan angle. Each candidate beam center may be processed sequentially. Prior to adding each candidate beam center to a current beam center set, checking whether a candidate beam center meets the stayout distance criteria from all beam centers already in the beam center set.
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公开(公告)号：US11206570B2
公开(公告)日：2021-12-21
申请号：US16880762
申请日：2020-05-21
申请人： Udaya Bhaskar , Stanley Kay , Neal David Becker
发明人： Udaya Bhaskar , Stanley Kay , Neal David Becker
摘要： A system and method for beamforming beams including: matching weights T to a distribution of resources for each of the beams based on a traffic variation for each of the beams; calculating, with a signal processor for each of the beams based on the weights T, a power scalar β and a weighted minimum mean squared error (WMMSE) matrix WWMSE; and transmitting/receiving the beams based on the power scalar β and the WMMSE matrix WWMSE, where the power scalar β satisfies a total power constraint of an antenna subsystem.
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公开(公告)号：US08559357B2
公开(公告)日：2013-10-15
申请号：US13086628
申请日：2011-04-14
申请人： David A. Roos , Adrian Morris , Stanley Kay , Pradman Kaul
发明人： David A. Roos , Adrian Morris , Stanley Kay , Pradman Kaul
IPC分类号： H04B7/185
CPC分类号： H04B7/18523 , H04B7/18528 , H04B7/18578 , H04B7/2041
摘要： A triple use satellite system includes a VSAT population including a VSAT, and a satellite including a broadcast beam for a broadcast service and spot beams for a broadband service, where each of the spot beams provides broadband service to VSATs in separate coverage areas in a geographic region and the broadcast beam provides a broadcast service to the VSAT population in the geographic region.
摘要翻译： 三重使用的卫星系统包括包括VSAT的VSAT群和包括用于广播服务的广播波束的卫星和用于宽带服务的点波束，其中每个点波束在地理上分开的覆盖区域中向VSAT提供宽带服务 区域，并且广播波束向地理区域中的VSAT群体提供广播服务。
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公开(公告)号：US20110255463A1
公开(公告)日：2011-10-20
申请号：US13086628
申请日：2011-04-14
申请人： David A. Roos , Adrian Morris , Stanley Kay , Pradman Kaul
发明人： David A. Roos , Adrian Morris , Stanley Kay , Pradman Kaul
IPC分类号： H04W84/06
CPC分类号： H04B7/18523 , H04B7/18528 , H04B7/18578 , H04B7/2041
摘要： A triple use satellite system includes a VSAT population including a VSAT, and a satellite including a broadcast beam for a broadcast service and spot beams for a broadband service, where each of the spot beams provides broadband service to VSATs in separate coverage areas in a geographic region and the broadcast beam provides a broadcast service to the VSAT population in the geographic region.
摘要翻译： 三重使用的卫星系统包括包括VSAT的VSAT群和包括用于广播服务的广播波束的卫星和用于宽带服务的点波束，其中每个点波束在地理上分开的覆盖区域中向VSAT提供宽带服务 区域，并且广播波束向地理区域中的VSAT群体提供广播服务。
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