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公开(公告)号：US10555185B2
公开(公告)日：2020-02-04
申请号：US16054062
申请日：2018-08-03
IPC分类号： H01Q1/00 , H01Q21/00 , H04W16/28 , H01Q1/12 , H01Q3/26 , H01Q21/06 , H04B7/08 , H04B7/185 , H01Q1/28 , H01Q3/34 , H01Q21/22 , H04W16/26
摘要： A receive planar phased array antenna on a communications platform is used to estimate a pointing error of the antenna and to orient the antenna boresight towards the transmitter. A method for orienting the communications antenna includes: segmenting a receive phase array antenna into N sub-arrays with M-antenna elements in each sub-array; receiving, a known signal, by each of the M-antenna elements of at least four (4) of the N-sub-arrays; scanning in a direction of the known signal by applying a beam weight associated with each of the M elements in each of the at least 4-sub-arrays to obtain M-weighted signals for each of the at least 4-sub-arrays; combining the M-weighted signals for each of the at least 4-sub-arrays into signals A, B, C and D, respectively; generating an azimuth difference signal per a weighted sum of (A+B) and (C+D) and an elevation difference signal per a weighted sum of (A+C) and (B+D); computing the weights of the azimuth difference signal, such that the azimuth difference signals is driven to a zero signal; and computing the weights of the elevation difference signal, such that the elevation difference signal is driven to a zero signal.
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公开(公告)号：US20180359647A1
公开(公告)日：2018-12-13
申请号：US16054062
申请日：2018-08-03
IPC分类号： H04W16/28 , H04B7/185 , H01Q1/28 , H01Q21/06 , H01Q21/00 , H01Q3/26 , H01Q1/12 , H01Q3/34 , H01Q21/22 , H04W16/26 , H04B7/08
摘要： A system and method for orienting a communications antenna are disclosed. The method includes: segmenting a receive phase array antenna into N sub-arrays with M-antenna elements in each sub-array; receiving, a known signal, by each of the M-antenna elements of at least four (4) of the N-sub-arrays; scanning in a direction of the known signal by applying a beam weight associated with each of the M elements in each of the at least 4-sub-arrays to obtain M-weighted signals for each of the at least 4-sub-arrays; combining the M-weighted signals for each of the at least 4-sub-arrays into signals A, B, C and D, respectively; generating an azimuth difference signal per a weighted sum of (A+B) and (C+D) and an elevation difference signal per a weighted sum of (A+C) and (B+D); computing the weights of the azimuth difference signal, such that the azimuth difference signals is driven to a zero signal; and computing the weights of the elevation difference signal, such that the elevation difference signal is driven to a zero signal. N is greater than or equal to four (4) and M is greater than or equal to one (1).
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公开(公告)号：US10051487B2
公开(公告)日：2018-08-14
申请号：US15469855
申请日：2017-03-27
CPC分类号： H04W16/28 , H01Q1/1257 , H01Q1/288 , H01Q3/26 , H01Q3/2605 , H01Q3/34 , H01Q21/0087 , H01Q21/06 , H01Q21/065 , H01Q21/22 , H04B7/0842 , H04B7/18504 , H04B7/18506 , H04B7/18515 , H04B7/18517 , H04B7/18519 , H04B7/18523 , H04B7/18532 , H04W16/26
摘要： A receive planar phased array antenna on a communications platform is used to estimate a pointing error of the antenna and to orient the antenna boresight towards the transmitter. A method for orienting the communications antenna includes: segmenting a receive phase array antenna into N sub-arrays with M-antenna elements in each sub-array; receiving, a known signal, by each of the M-antenna elements of at least four (4) of the N-sub-arrays; scanning in a direction of the known signal by applying a beam weight associated with each of the M elements in each of the at least 4-sub-arrays to obtain M-weighted signals for each of the at least 4-sub-arrays; combining the M-weighted signals for each of the at least 4-sub-arrays into signals A, B, C and D, respectively; generating an azimuth difference signal per a weighted sum of (A+B) and (C+D) and an elevation difference signal per a weighted sum of (A+C) and (B+D); computing the weights of the azimuth difference signal, such that the azimuth difference signals is driven to a zero signal; and computing the weights of the elevation difference signal, such that the elevation difference signal is driven to a zero signal.
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公开(公告)号：US11757505B2
公开(公告)日：2023-09-12
申请号：US17451876
申请日：2021-10-22
IPC分类号： H04L12/40 , H04B7/06 , H04B7/0408 , H04B7/0426 , H04B7/204
CPC分类号： H04B7/0617 , H04B7/043 , H04B7/0408 , H04B7/2041
摘要： A system and method for beamforming includes providing an antenna including feeds, a coverage area including service areas and data streams for each of the service areas; selecting a cluster of M feeds from the feeds; computing, with a GBBF processor (ground based beam former), M×N weights; generating M feed excitations by distributing the N data streams per the M×N weights; switching an array to transfer a respective one of the M feed excitations to a respective one of the M feeds; and beamforming, with the M feeds of the antenna, N beams. In the method, the N beams are each focused on a respective service area of each of the N data streams, the M×N weights improve the transmitting into the respective service area of each of the N data streams, and at least one of the N beams includes a portion of a plurality of the M feed excitations.
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公开(公告)号：US20220182107A1
公开(公告)日：2022-06-09
申请号：US17451876
申请日：2021-10-22
IPC分类号： H04B7/0426 , H04B7/204 , H04B7/0408 , H04B7/06
摘要： A system and method for beamforming includes providing an antenna including feeds, a coverage area including service areas and data streams for each of the service areas; selecting a cluster of M feeds from the feeds; computing, with a GBBF processor (ground based beam former), M×N weights; generating M feed excitations by distributing the N data streams per the M×N weights; switching an array to transfer a respective one of the M feed excitations to a respective one of the M feeds; and beamforming, with the M feeds of the antenna, N beams. In the method, the N beams are each focused on a respective service area of each of the N data streams, the M×N weights improve the transmitting into the respective service area of each of the N data streams, and at least one of the N beams includes a portion of a plurality of the M feed excitations.
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公开(公告)号：US11184071B1
公开(公告)日：2021-11-23
申请号：US17247224
申请日：2020-12-04
IPC分类号： H04B7/06
摘要： A system and method for beamforming includes providing an antenna including feeds, a coverage area including service areas and data streams for each of the service areas; scheduling N data streams of the data streams, selecting a cluster of M feeds from the feeds; computing, with a GBBF processor (ground based beam former), M×N weights; generating M feed excitations by distributing the N data streams per the M×N weights; switching an array to transfer a respective one of the M feed excitations to a respective one of the M feeds; and beamforming, with the M feeds of the antenna, N beams. In the method, the N beams are each focused on a respective service area of each of the N data streams, the M×N weights improve the transmitting into the respective service area of each of the N data streams, and at least one of the N beams includes a portion of a plurality of the M feed excitations.
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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：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：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：US10819479B2
公开(公告)日：2020-10-27
申请号：US16290262
申请日：2019-03-01
申请人： Neal David Becker
发明人： Neal David Becker
摘要： A User Equipment and method for transmitting a random-access radio frequency (RF) signal by applying Asynchronous Coded Multiple Access (ACMA) in a communication system employing Orthogonal Frequency Division Multiplexing (OFDM) is described. The method including: encoding an information stream as OFDM symbols using a low rate Forward Error Correction (FEC) coding suitable for Successive Interference Cancellation (SIC) to form a payload; generating a burst, including symbols, by performing an inverse fast Fourier transform on a unique word (UW) multiplexed with the payload; and synchronizing a transmission of each of the symbols of the burst with consecutive symbol-start instants. The UW includes a plurality of Zadoff-Chu (ZC) like sequences disposed in a subset of consecutive symbol-start instants of the burst. A receiver detects burst arrival by searching for consecutive ZC-like sequences. Channel state estimation can be performed by using the UW with additional ZC-like sequences in the burst.
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