CN104215936B - A kind of eight unit T/R basic modules of S frequency range multi-beam transmission duplex - Google Patents
A kind of eight unit T/R basic modules of S frequency range multi-beam transmission duplex Download PDFInfo
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- CN104215936B CN104215936B CN201410413146.9A CN201410413146A CN104215936B CN 104215936 B CN104215936 B CN 104215936B CN 201410413146 A CN201410413146 A CN 201410413146A CN 104215936 B CN104215936 B CN 104215936B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
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Abstract
The present invention relates to eight unit T/R basic modules of a kind of S frequency range multi-beam transmission duplex, it is adaptable to large-scale multi-beam Connectors for Active Phased Array Radar, particularly S frequency range unified carrier TT & C communication system, belong to microwave and millimeter wave communication technique field.This module working frequency range is 2.0～2.3GHz, and module includes eight road T/R assemblies, two one point of eight power splitters, four combiners and digital control unit.The present invention works in S frequency range, owing to the present invention uses dual pathways height suppression duplexer to suppress to launch leakage signal, so for transmission duplex system, launch working frequency range and reception working frequency range sideband is only spaced 80MHz, and when wherein launching beam output is up to+30dBm (1W), still can avoid launching signal and receiving branch pre-amplifier is caused obstruction.
Description
Technical field
The present invention relates to eight unit T/R basic modules of a kind of S frequency range multi-beam transmission duplex, it is adaptable to big
Type multi-beam Connectors for Active Phased Array Radar, particularly S frequency range unified carrier TT & C communication system, belong to microwave milli
Metric wave communication technique field.
Background technology
In a Connectors for Active Phased Array Radar, the quantity of T/R assembly tens at least, the most thousands of,
Its existing transmission channel, has again reception passage, possesses the functional circuit such as phase shift, wave beam control, therefore, T/R
Assembly is one of core component of Connectors for Active Phased Array Radar, and its performance, reliability, development cost are by direct shadow
Ring the success or failure to system.
For meeting Sidelobe requirement, T/R assembly must adapt to the antenna unit interval requirement less than 0.5 λ, with
Time be the transmission path shortening T/R assembly and antenna element, reduce feeder loss, improve power amplifier
The G/T value of service efficiency and antenna, need realize in the area of 69mm × 180mm 4 groups receive passages,
1 group of transmission channel and a large amount of power line, the arrangement of control line, it can be seen that realize T/R component miniaturization, mould
Massing and batch productization are the key technologies that phased array antenna must break through.
But this frequency range T/R assembly is largely determined by the working system of transmission duplex, miniaturization, low noise at present
Sound, low-power consumption become the difficult point of S frequency range T/R module development.
Document " A Full-Duplex, Multi-Channel Transmit/Receive Module for an S-Band
Satellite Communications Phased Array”Phased Array Systems and
Technologh(ARRAY),2010 IEEE International Symposium on pp.202-210,12-15Oct
The single T/R assembly of dual pathways transmission duplex is proposed, owing to its duplexer uses dielectric filter in 2010
Realize, this circuit reduce the use of cavity body filter, be conducive to reducing T/R assembly volume, but it is inserted
Damage relatively big (1.2dB), it is more difficult to realizing the high out-of-side rejection of cavity body filter, radar receiving sensitivity is the highest.Its
Phase shifter uses microstrip line to realize with single-pole double-throw switch (SPDT), meets minimum 22.5 °, the demand of 4 displacement phases only,
Directly affect the beam scanning precision of active phase array antenna.Receive simultaneously, launch and only form the dual pathways, only
Multi-beam can be realized, it is impossible to meet multiple target tracking simultaneously and require (4～6) by molecule battle array.
Summary of the invention
The invention aims to overcome S frequency range transmission duplex system active phased array T/R assembly volume big,
Receiving sensitivity is low, the technical barrier of transmitting-receiving multi-beam, it is provided that Unit eight of S frequency range multi-beam transmission duplex
T/R component standard module, this T/R assembly can be penetrated as the standard configuration of large-scale active phase array antenna, module
Frequently interface is SMP interface, joins radio frequency connector for novel microminiature is blind, has that use frequency is high, connects
Quickly, vibration resistance is strong, allow there are the features such as certain amount of mismatch on axially and radially, and low frequency interface is J30J
Interface, compact conformation, repeatability are strong so that phased-array radar group battle array is more flexible, and reduces into
This, the scope of application is wider.
It is an object of the invention to be achieved through the following technical solutions.
A kind of eight unit T/R basic modules of the S frequency range miniaturization multi-beam transmission duplex of the present invention, this mould
Block working frequency range is 2.0～2.3GHz, module include eight road T/R assemblies, two one point of eight power splitters, four
Combiner and digital control unit；Wherein, each T/R assembly includes numerical-control attenuator S1, numerical-control attenuator
S2, numerical-control attenuator S3, numerical-control attenuator S4, numerical-control attenuator S5, low-noise amplifier A1, low noise
Acoustic amplifier A2, low-noise amplifier A3, low-noise amplifier A4, power amplifier A5, power amplification
Device A6, the dual pathways height suppression duplexer N1, the dual pathways height suppression duplexer N2, switch N3, switch N4,
Switch N7, switch N8, switch N9, switch N10, one-to-two power splitter N11, one point of four power splitter N5,
One point of four power splitter N6, bonder D1, bonder D2, digital phase shifter D3, digital phase shifter D4,
Digital phase shifter D5, digital phase shifter D6；
When modular assembly is launched, launching beam delivers to eight road T/R assemblies of correspondence respectively through one point of eight power splitter,
After entering T/R component internal, launching beam first passes around numerical-control attenuator S1, according to digital control unit
Beam-control code enters power amplifier A6, power amplifier A5 after completing the decay to launching beam, completes to send out
The power amplification of ejected wave bundle, the launching beam after power amplification carries out left-right rotary by switch N3 to launching beam
To selection, when launching beam is dextrorotation, enters dual pathways height suppression duplexer N1, complete launching beam
Filtering after, enter bonder D1, finally launch through dextrorotation antenna；When launching beam is left-handed,
Enter dual pathways height suppression duplexer N2, after completing the filtering to launching beam, enter bonder D2,
Launch through left-handed antenna eventually；
When modular assembly receives, receiving wave beam and simultaneously enter T/R assembly by left-right rotary antenna, dextrorotation receives
Wave beam enters bonder D1, and completes to receive dextrorotation the filter of wave beam by dual pathways height suppression duplexer N1
After ripple, enter low-noise amplifier A1, low-noise amplifier A2, complete dextrorotation is received the signal of wave beam
Amplifying, the dextrorotation after amplification receives wave beam and sends into one point of four power splitter N5, dextrorotation receives wave beam and is divided into four tunnels
Dextrorotation receives wave beam；Left-handed reception wave beam enters bonder D1, and suppresses duplexer N2 by dual pathways height
After completing the filtering to left-handed reception wave beam, enter low-noise amplifier A3, low-noise amplifier A4, complete
The signal of paired left-handed reception wave beam amplifies, and the dextrorotation after amplification receives wave beam and sends into one point of four power splitter N6,
Left-handed reception wave beam is divided into the four left-handed reception in tunnel wave beams, four tunnel dextrorotation receive wave beam divides four tunnels to be sent respectively to
Switch N7, switch N8, switch N9, switch N10；Four tunnel left-handed reception wave beams divide four tunnels to be sent respectively to
Switch N7, switch N8, switch N9, switch N10；Switch N7, switch N8, switch N9, switch
N10 receives wave beam and the left-handed reception in four tunnels wave beam to four tunnel dextrorotation respectively according to the beam-control code of digital control unit
Select；
Reception wave beam after switch N7 will select is sent to numerical-control attenuator S2, receives wave beam and declines through numerical control
After subtracting the decay of device S2, it is sent to digital phase shifter D3, the digital phase shifter D3 wave beam to receiving and carries out
It is sent to combiner after phase shift, after the wave beam received is carried out closing road by combiner, is finally completed reception wave beam
Signal processing；
Reception wave beam after switch N8 will select is sent to numerical-control attenuator S3, receives wave beam and declines through numerical control
After subtracting the decay of device S3, it is sent to digital phase shifter D4, the digital phase shifter D4 wave beam to receiving and carries out
It is sent to combiner after phase shift, after the wave beam received is carried out closing road by combiner, is finally completed reception wave beam
Signal processing；
Reception wave beam after switch N9 will select is sent to numerical-control attenuator S4, receives wave beam and declines through numerical control
After subtracting the decay of device S4, it is sent to digital phase shifter D5, the digital phase shifter D5 wave beam to receiving and carries out
It is sent to combiner after phase shift, after the wave beam received is carried out closing road by combiner, is finally completed reception wave beam
Signal processing；
Reception wave beam after switch N10 will select is sent to numerical-control attenuator S5, receives wave beam and declines through numerical control
After subtracting the decay of device S5, it is sent to digital phase shifter D6, the digital phase shifter D6 wave beam to receiving and carries out
It is sent to combiner after phase shift, after the wave beam received is carried out closing road by combiner, is finally completed reception wave beam
Signal processing；
During modular assembly calibration, calibration wave beam delivers to eight road T/R groups of correspondence respectively by one point of eight power splitter
Part, after entering T/R component internal, sends into switch N4, and switch N4 is according to the beam-control code of digital control unit
Selecting calibration wave beam, the calibration wave beam after gating is divided into two-way by one-to-two power splitter N11 and calibrates
Wave beam, is simultaneously fed into bonder D1 and bonder D2, and that sends into bonder D1 calibrates wave beam for dextrorotation, send
Enter bonder D2 for left-handed calibration wave beam, the signal of dextrorotation calibration wave beam flows to receive wave beam one with dextrorotation
Cause；The signal of left-handed calibration wave beam flows to consistent with left-handed reception wave beam.
Above-mentioned T/R assembly, one point of eight power splitter, the working frequency range of combiner all select S frequency range device,
Preferably 2.0～2.3GHz frequency range in device.
Above-mentioned digital phase shifter used for 6 bit digital phase shifters, and numerical-control attenuator uses 5 digit digital attenuators.
Beneficial effect
(1) present invention works in S frequency range, owing to the present invention uses dual pathways height suppression duplexer to suppress to send out
Penetrate leakage signal, so for transmission duplex system, launch working frequency range and receive working frequency range sideband only between
Every 80MHz, and when wherein launching beam output is up to+30dBm (1W), still can avoid launching letter
Number receiving branch pre-amplifier is caused obstruction.
Receiving simultaneously and use the design of two-way low-noise amplifier, in working frequency range, noise coefficient is less than 0.6dB,
In the duplexer band of dual pathways height suppression simultaneously, Insertion Loss is only 0.8dB, and Out-of-band rejection is up to the basic mould of 70dB, T/R
The reception noise coefficient of block is less than 1.6dB, substantially increases receiving sensitivity.
(2) present invention is by using dual pathways height suppression duplexer to solve a difficult problem for transmitting-receiving high-isolation, sends out
Penetrate power reach 1W output time, received signal to noise ratio without deteriorate, transmitting-receiving suppression can reach more than 70dB.
(3) present invention uses 6 bit digital phase shifters, 5 attenuators to complete beam scanning function, minimum shifting
Phase precision is 5.625 °, and minimal attenuation precision is 0.25dB, substantially increases beam-pointing accuracy.
(4) present invention uses 4 road individual reception link design, carries out left and right by double-pole four-throw switching network
Rotary-cut is changed, and can form 4 separate road left-right rotaries arbitrarily selects multi-beam to full battle array simultaneously, compensate for molecule
Battle array realizes multi-beam demand so that system is more flexible.
(5) present invention uses multi-layer RF link to connect up and down, digital signal is isolated with radio frequency link, structure
The measures such as integrated design, have captured the guardian techniques such as multichannel, miniaturization, electromagnetic interference.
(6) present invention uses integration, Miniaturization Design, and debugging amount is little, can effectively reduce the development time,
Can on a large scale, production line balance, for high-volume, high reliability product payment provide powerful guarantee, as
Standard module makes phased array antenna design more flexible.
Accompanying drawing explanation
Fig. 1 is the composition schematic diagram of the eight unit T/R basic modules of the present invention；
Fig. 2 is the composition schematic diagram of the T/R assembly of the present invention.
Detailed description of the invention
With specific embodiment, the present invention is done further detailed description below in conjunction with the accompanying drawings.
Embodiment
A kind of eight unit T/R basic modules of S frequency range miniaturization multi-beam transmission duplex, this module work frequency
Section is 2.0～2.3GHz, as it is shown in figure 1, module include eight road T/R assemblies, two one point of eight power splitters,
Four combiners and digital control unit；Wherein, as in figure 2 it is shown, each T/R assembly includes numerical control attenuation
Device S1, numerical-control attenuator S2, numerical-control attenuator S3, numerical-control attenuator S4, numerical-control attenuator S5, low noise
Acoustic amplifier A1, low-noise amplifier A2, low-noise amplifier A3, low-noise amplifier A4, power are put
Big device A5, power amplifier A6, dual pathways height suppression duplexer N1, dual pathways height suppression duplexer N2,
Switch N3, switch N4, switch N7, switch N8, switch N9, switch N10, one-to-two power splitter N11,
One point of four power splitter N5, one point of four power splitter N6, bonder D1, bonder D2, digital phase shifter D3,
Digital phase shifter D4, digital phase shifter D5, digital phase shifter D6；
When modular assembly is launched, launching beam delivers to eight road T/R assemblies of correspondence respectively through one point of eight power splitter,
After entering T/R component internal, launching beam first passes around numerical-control attenuator S1, according to digital control unit
Beam-control code enters power amplifier A6, power amplifier A5 after completing the decay to launching beam, completes to send out
The power amplification of ejected wave bundle, the launching beam after power amplification carries out left-right rotary by switch N3 to launching beam
To selection, when launching beam is dextrorotation, enters dual pathways height suppression duplexer N1, complete launching beam
Filtering after, enter bonder D1, finally launch through dextrorotation antenna；When launching beam is left-handed,
Enter dual pathways height suppression duplexer N2, after completing the filtering to launching beam, enter bonder D2,
Launch through left-handed antenna eventually；
When modular assembly receives, receiving wave beam and simultaneously enter T/R assembly by left-right rotary antenna, dextrorotation receives
Wave beam enters bonder D1, and completes to receive dextrorotation the filter of wave beam by dual pathways height suppression duplexer N1
After ripple, enter low-noise amplifier A1, low-noise amplifier A2, complete dextrorotation is received the signal of wave beam
Amplifying, the dextrorotation after amplification receives wave beam and sends into one point of four power splitter N5, dextrorotation receives wave beam and is divided into four tunnels
Dextrorotation receives wave beam；Left-handed reception wave beam enters bonder D1, and suppresses duplexer N2 by dual pathways height
After completing the filtering to left-handed reception wave beam, enter low-noise amplifier A3, low-noise amplifier A4, complete
The signal of paired left-handed reception wave beam amplifies, and the dextrorotation after amplification receives wave beam and sends into one point of four power splitter N6,
Left-handed reception wave beam is divided into the four left-handed reception in tunnel wave beams, four tunnel dextrorotation receive wave beam divides four tunnels to be sent respectively to
Switch N7, switch N8, switch N9, switch N10；Four tunnel left-handed reception wave beams divide four tunnels to be sent respectively to
Switch N7, switch N8, switch N9, switch N10；Switch N7, switch N8, switch N9, switch
N10 receives wave beam and the left-handed reception in four tunnels wave beam to four tunnel dextrorotation respectively according to the beam-control code of digital control unit
Select；
Reception wave beam 1 after switch N7 will select is sent to numerical-control attenuator S2, receives wave beam 1 through number
After the decay of controlling attenuation device S2, it is sent to digital phase shifter D3, the digital phase shifter D3 wave beam to receiving
1 carry out phase shift after be sent to combiner 1, the wave beam received is carried out closing behind road by combiner 1, is finally completed
Receive the signal processing of wave beam 1；
Reception wave beam 2 after switch N8 will select is sent to numerical-control attenuator S3, receives wave beam 2 through number
After the decay of controlling attenuation device S3, it is sent to digital phase shifter D4, the digital phase shifter D4 wave beam to receiving
It is sent to combiner 2 after carrying out phase shift, after the wave beam received is carried out closing road by combiner 2, is finally completed and connects
Receive the signal processing of wave beam 2；
Reception wave beam 3 after switch N9 will select is sent to numerical-control attenuator S4, receives wave beam 3 through number
After the decay of controlling attenuation device S4, it is sent to digital phase shifter D5, the digital phase shifter D5 wave beam to receiving
It is sent to combiner 3 after carrying out phase shift, after the wave beam received is carried out closing road by combiner 3, is finally completed and connects
Receive the signal processing of wave beam 3；
Reception wave beam 4 after switch N10 will select is sent to numerical-control attenuator S5, receives wave beam 4 through number
After the decay of controlling attenuation device S5, it is sent to digital phase shifter D6, the digital phase shifter D6 wave beam to receiving
It is sent to combiner 4 after carrying out phase shift, after the wave beam received is carried out closing road by combiner 4, is finally completed and connects
Receive the signal processing of wave beam 4；
During modular assembly calibration, calibration wave beam delivers to eight road T/R groups of correspondence respectively by one point of eight power splitter
Part, after entering T/R component internal, sends into switch N4, and switch N4 is according to the beam-control code of digital control unit
Selecting calibration wave beam, the calibration wave beam after gating is divided into two-way by one-to-two power splitter N11 and calibrates
Wave beam, is simultaneously fed into bonder D1 and bonder D2, and that sends into bonder D1 calibrates wave beam for dextrorotation, send
Enter bonder D2 for left-handed calibration wave beam, the signal of dextrorotation calibration wave beam flows to receive wave beam one with dextrorotation
Cause；The signal of left-handed calibration wave beam flows to consistent with left-handed reception wave beam.
Above-mentioned T/R assembly, one point of eight power splitter, the working frequency range of combiner all select S frequency range device,
Preferably 2.0～2.3GHz frequency range in device.
Above-mentioned digital phase shifter used for 6 bit digital phase shifters, and numerical-control attenuator uses 5 digit digital attenuators.
In the present invention, unspecified part belongs to general knowledge as well known to those skilled in the art.
Claims (5)
1. eight unit T/R basic modules of a S frequency range multi-beam transmission duplex, it is characterised in that: this mould
Block includes eight road T/R assemblies, two one point of eight power splitters, four combiners and digital control unit；Wherein,
Each T/R assembly includes numerical-control attenuator S1, numerical-control attenuator S2, numerical-control attenuator S3, numerical control attenuation
Device S4, numerical-control attenuator S5, low-noise amplifier A1, low-noise amplifier A2, low-noise amplifier
A3, low-noise amplifier A4, power amplifier A5, power amplifier A6, dual pathways height suppression duplexer
N1, dual pathways height suppression duplexer N2, switch N3, switch N4, switch N7, switch N8, switch
N9, switch N10, one-to-two power splitter N11, one point of four power splitter N5, one point of four power splitter N6, coupling
Clutch D1, bonder D2, digital phase shifter D3, digital phase shifter D4, digital phase shifter D5, numerical control
Phase shifter D6；
When module is launched, launching beam delivers to eight road T/R assemblies of correspondence respectively through one point of eight power splitter, enters
After entering T/R component internal, launching beam first passes around numerical-control attenuator S1, according to the ripple of digital control unit
Control code enters power amplifier A6, power amplifier A5 after completing the decay to launching beam, completes to launch
The power amplification of wave beam, the launching beam after power amplification carries out left and right rotation direction by switch N3 to launching beam
Select, when launching beam is dextrorotation, enters dual pathways height suppression duplexer N1, complete launching beam
After filtering, enter bonder D1, finally launch through dextrorotation antenna；When launching beam is left-handed, enter
Enter dual pathways height suppression duplexer N2, after completing the filtering to launching beam, enter bonder D2, finally
Launch through left-handed antenna；
When module receives, receiving wave beam and simultaneously enter T/R assembly by left-right rotary antenna, dextrorotation receives wave beam
Enter bonder D1, and by the dual pathways height suppression duplexer N1 complete to dextrorotation reception wave beam filtering after,
Entering low-noise amplifier A1, low-noise amplifier A2, the signal completing to receive dextrorotation wave beam amplifies,
Dextrorotation after amplification receives wave beam and sends into one point of four power splitter N5, dextrorotation receives wave beam and is divided into four tunnel dextrorotation to connect
Receive wave beam；Left-handed reception wave beam enters bonder D2, and it is right to suppress duplexer N2 to complete by dual pathways height
After the filtering of left-handed reception wave beam, enter low-noise amplifier A3, low-noise amplifier A4, complete a left side
Spinning and receive the signal amplification of wave beam, the left-handed reception wave beam after amplification sends into one point of four power splitter N6, by left-handed
Receive wave beam and be divided into the four left-handed reception in tunnel wave beams, four tunnel dextrorotation receive wave beams divide four tunnels be sent respectively to switch N7,
Switch N8, switch N9, switch N10；Four tunnel left-handed reception wave beams divide four tunnels be sent respectively to switch N7,
Switch N8, switch N9, switch N10；Switch N7, switch N8, switch N9, switch N10 are according to number
The beam-control code of word control unit respectively four tunnel dextrorotation is received wave beam and four tunnels left-handed reception wave beam selects；
Reception wave beam after switch N7 will select is sent to numerical-control attenuator S2, receives wave beam and declines through numerical control
After subtracting the decay of device S2, it is sent to digital phase shifter D3, the digital phase shifter D3 wave beam to receiving and carries out
It is sent to combiner after phase shift, after the wave beam received is carried out closing road by combiner, is finally completed reception wave beam
Signal processing；
Reception wave beam after switch N8 will select is sent to numerical-control attenuator S3, receives wave beam and declines through numerical control
After subtracting the decay of device S3, it is sent to digital phase shifter D4, the digital phase shifter D4 wave beam to receiving and carries out
It is sent to combiner after phase shift, after the wave beam received is carried out closing road by combiner, is finally completed reception wave beam
Signal processing；
Reception wave beam after switch N9 will select is sent to numerical-control attenuator S4, receives wave beam and declines through numerical control
After subtracting the decay of device S4, it is sent to digital phase shifter D5, the digital phase shifter D5 wave beam to receiving and carries out
It is sent to combiner after phase shift, after the wave beam received is carried out closing road by combiner, is finally completed reception wave beam
Signal processing；
Reception wave beam after switch N10 will select is sent to numerical-control attenuator S5, receives wave beam and declines through numerical control
After subtracting the decay of device S5, it is sent to digital phase shifter D6, the digital phase shifter D6 wave beam to receiving and carries out
It is sent to combiner after phase shift, after the wave beam received is carried out closing road by combiner, is finally completed reception wave beam
Signal processing；
During modular calibration, calibration wave beam delivers to eight road T/R assemblies of correspondence respectively by one point of eight power splitter,
After entering T/R component internal, send into switch N4, the switch N4 beam-control code according to digital control unit to school
Quasi wave Shu Jinhang selects, and the calibration wave beam after gating is divided into two-way calibration wave beam by one-to-two power splitter N11,
Being simultaneously fed into bonder D1 and bonder D2, that sends into bonder D1 calibrates wave beam for dextrorotation, sends into coupling
Device D2 for left-handed calibration wave beam, the signal of the calibration wave beam of dextrorotation afterwards flows to consistent with dextrorotation reception wave beam；
The signal of left-handed calibration wave beam flows to consistent with left-handed reception wave beam.
The eight basic moulds of unit T/R of a kind of S frequency range multi-beam transmission duplex the most according to claim 1
Block, it is characterised in that: T/R assembly, one point of eight power splitter, the working frequency range of combiner all select S frequency range
Device.
The eight basic moulds of unit T/R of a kind of S frequency range multi-beam transmission duplex the most according to claim 2
Block, it is characterised in that: T/R assembly, one point of eight power splitter, the working frequency range of combiner are all selected
Device in 2.0～2.3GHz frequency ranges.
The eight basic moulds of unit T/R of a kind of S frequency range multi-beam transmission duplex the most according to claim 1
Block, it is characterised in that: digital phase shifter used for 6 bit digital phase shifters.
The eight basic moulds of unit T/R of a kind of S frequency range multi-beam transmission duplex the most according to claim 1
Block, it is characterised in that: numerical-control attenuator uses 5 digit digital attenuators.
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| US20240322431A1 (en) * | 2021-02-24 | 2024-09-26 | Bluehalo, Llc | System and method for a digitally beamformed phased array feed |
| US12278433B2 (en) * | 2021-02-24 | 2025-04-15 | Bluehalo, Llc | System and method for a digitally beamformed phased array feed |
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