mastr –multi application smallsattri-band radar
TRANSCRIPT
IIP-16
MASTR – Multi Application Smallsat Tri-band Radar
P.I. Mauricio Sanchez-Barbetty – JPLCo-Is:
Simone Tanelli, Gregory Sadowy, JPLDavid Miller, Gary Ayers, Tonda McLeaod, Nuvotronics
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MotivationMASTR-IIP16
GPM – Dual-frequency Precipitation Radar – NICT/JAXAKu/Ka, Scanning, Precipitation
Ku-band RADAR
Ka-band RADAR
RAIN Cube – JPL/NASA InvestKa-band, 6U Cubesat
EarthCARE – Cloud Profiling Radar CPR – W-BandNICT/JAXA
Clouds and Precipitation• Addressed separately by active instruments so far (i.e., TRMM,
GPM & RainCube at Ku and Ka band, vs CloudSat and EarthCARE at W-band).
• Three-frequency single aperture radar enables holistic view of the cloud-precipitation process
• e.g., J. Leinonen, et al. 2014, ACE decadal survey mission concept (Ka-/ W-band), Cloud and Precipitation Processes Mission (CaPPM) concept. (Ku-, Ka-, W-band) responses to Decadal Survey 2017.
• Technology maturity over the last decade enables scanning at W-band as well as tri-band integration
ReflectArray ACE radar
ES DS 2007: ACE Mission Concept Radar
Ka/W, Doppler, Scanning (Ka)
ACERAD
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What is MASTRMASTR-IIP16
MASTR is tri-band (Ku-, Ka-, W-band) scalable phased array radar. Designed to work as a Cloud and Precipitation Radar,
an Altimeter, or a Scatterometer (in a Spinning platform). A modular, scalable architecture enables technology maturation via an airborne demonstration AirMASTR. A compact profile allows multiple
implementations depending of mission requirements, power, and budget available (ranging from SmallSats to large platforms). Space MASTR Concept
Courtesy of Nuvotronics Inc.
AirMASTR – Instrument Model
ALAF(Active Linear Array Feed)
Reflector30cm x 50cm
Scanning Array Tiles –SAT SBIR DATA RIGHTS: Contract Number: NNX15CP18C.
Ku-Band
Ku-Band
W-Band
AirMASTR – Active Linear Array Feed -ALAFs
Ka-band
W-band
Ku-band
3
• All modules assembled• Easy Assembly: Precision alignment and wirebonding blocks• Ease of Test and Rework- Isolation frames, lids and re-connectable antenna
Ka-Band Ku-Band
Ka and Ku Scanning Array Tiles
SBIR DATA RIGHTS: Contract Number: NNX15CP18C.
Description Ku-Band Ka-Band
Frequency 13.6GHz 35.75GHz
Tx elements 4
Rx elements 4
Tx power per element (peak)
+36.7dBm +43dBm
Tx duty cycle 10%
Rx noise figure 4dB 4.5dB
Size 64 x 44 x 175 mm
23.6 x 16 x 54 mm
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Ka and Ku ARRIN Board
➢ Up to 16 SPI buses in parallel for control and programming of Tx/Rx channels
➢ Charged storage capacitor banks for transmitter pulsed DC power
➢ Differential power delivery mitigates external noise pickup
➢ Voltage rail sensing reduces voltage drop effects for power delivery
➢ OVLO/UVLO and power sequencing protects ARIN and SAT circuits
KuKa
• Pulse into Ku HPA• Pulse shows 2uS
leading edge delay with no trailing edge RF turn off prior to trigger off condition.
• Detected RF shows rapid turn off at trailing edge
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Ku Active Linear Array Feed
05
10152025
1 2 3 4 5 6 7 8 9 10 11 12
Gai
n, d
B
Array Cell No.
Ku Rx Gains
Spec RxV RxH
Mean = 19.21 dB Variance = 1.11 dB
Ku ALAF
PCB/SMT technology, 3-way COTS combiners, SMA cables
result in reduced cost and low loss
RxV-pol steering
RxH-pol steering
Tx at boresightThis document has been reviewed and determined not to contain export controlled technical data. 6
0
2
4
6
8
10
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31
Gai
n, d
B
Array Cell No.
Ka Rx: Gains
Spec RxV RxH
Mean = 8.30 dB Variance = 0.49 dB
• High uniformity and low loss using PolyStrata® technology
with MMIC/wirebonds
• PolyStrata® 8-way combiners and 0.086 coax cables result
in low RF signal loss
25 dB return loss
30 dB isolation
0.6 dB insertion loss
Ka ALAF
Ka Active Linear Array Feed
PolyStrata® combiner
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Status and Future WorkMASTR-IIP16
• Estimated first flight: June 2021.• Ku-band Active Linear Array Feed has been characterized.• Ka-band Active Linear Array Feed characterization in
progress.• W-band Active Linear Array Feed integration in progress.• Instrument integration scheduled for Feb-2021.
W-Band Scanning Array Tile TestW-Band ALAF (Active Linear Array Feed)
Development
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Antenna Reflector Scaling and Feed Displacement
Along Track Radiation Pattern of Airborne Concept (50cm)
In both cases the W-band feed is at the focal point of the reflector, the Ka-band displace 2cm in one direction and the Ku-band displaced 4cm in the opposite direction.
Along Track Radiation Pattern of Spaceborne Concept (5m)
Along track pattern at 13.4GHz vs feed location
Side view of feed geometry
Along track pattern at 35.7GHz vs feed location
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Estimated ALAF Temperature Map
• Temperature rise estimates based on thermal load estimates determined by IC efficiency, location and operation modes.
• Isothermal boundary condition in coolant tube = 293.6K
• Peak temperature rise of all metal structures is 17.5°C
Component Peak dT above Coolant (°C)
Ku SAT 17.5W SAT 16.4Ka SAT 13.7
Cold Plate 1.4Waveguide Combiner 3.9
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AirMASTR• MASTR-IIP16
• Active Linear Array Feeds closely spaced at the focal point of a parabolic-rectangular reflector.
• Feed closely spaced, yet each band is independent of the others.
• Configuration shown has 3 Ku-band Scanning Array Tiles - SATs, 8 Ka-band SATs, and 8 W-band SATs.
Digital Sub System (DSS)
10MHz/100MHz
REF
REF
DAC1
ADC1
ADC2
REF
REF
REF
Ka-Band Frequency Converter
Ku-Band Frequency Converter
IQin1
IQout1
IQout2
DAC2
ADC3
ADC4
IQin1
IQout1
IQout2
DAC3
ADC5
ADC6
TX
RXH
RXV
Ku-Band ALAF19cm
SAT4x2
SAT4x2
SAT4x2
Ka-Band ALAF
19.1cm
SAT 4x2
SAT 4x2
SAT 4x2
SAT 4x2
SAT 4x2
SAT 4x2
SAT 4x2
SAT 4x2
TX
RXH
RXV
W-Band Frequency Converter
IQin1
IQout1
IQout2
W-Band ALAF16cm
SAT 8x2
SAT 8x2
SAT 8x2
SAT 8x2
SAT 8x2
SAT 8x2
SAT 8x2
SAT 8x2
TX
RXH
RXV
PTC(Power and Temperature Control)
REF
Control Telemetry
FREQUENCY CONVERTERS
REF
REF
ACTIVE LINEAR ARRAY FEEDS
REF
CALPROBE
CALPROBE
CALPROBE
CONTROL
POWER
CONTROL
POWER
CONTROL
POWER
Active Linear Array Feeds
Reflector
AirMASTR - ACTIVE LINEAR ARRAY FEEDS
Ka-band
W-band