Author Topic: Commercial SAR Constellations  (Read 42764 times)

Online gongora

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Commercial SAR Constellations
« on: 01/27/2019 12:41 am »
These things keep popping up.  In addition to ICEye and Capella, I've noticed:

Umbra: This one will be really interesting if they come anywhere close to their goals.  They are claiming a breakthrough in SAR performance (quarter meter resolution).
FCC permits for testing from aircraft:    0440-EX-ST-2017 2024-EX-ST-2018

XpressSAR
https://www.nesdis.noaa.gov/CRSRA/files/xpresssar.pdf
XPRESSSAR, INC. SELECTS IAI'S TECSAR TECHNOLOGY FOR ITS HIGH-RESOLUTION X-BAND SATELLITE CONSTELLATION

R2Space 0011-EX-CN-2019

NovaSAR-1 (demo sat from SSTL/Airbus, funded by UK)
UrtheCast - OptiSAR
Ursa Space Systems - Analyze data from others

https://www.nanalyze.com/2018/06/space-radar-satellites-tracking-earth/
http://syntheticapertureradar.com/new-space-disruption-iceye-umbra-lab-and-capella-space/

Predasar
Synspective
Trident Space
iQPS
Spacety
« Last Edit: 03/25/2021 02:10 pm by gongora »

Offline Nertea

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Re: Commercial SAR Constellations
« Reply #1 on: 04/04/2019 04:00 am »
Oxford Space Systems released their new payload. Its pretty cool but it does not really fit into "new space" my back of the napkin says it will be 3x the cost of Capella or Iceye with the same performance. A little disappointing but cool design. 

https://www.bbc.com/news/science-environment-47787598

Attached:

Oxford Space Systems SAR
Development of a novel X-band Cassegrain deployable antenna for microsatellite platforms
By, Dr. Yoshiro OGI and Mike Lawton

Offline Nertea

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Re: Commercial SAR Constellations
« Reply #2 on: 04/05/2019 05:15 am »
I was really sad to hear about the M.M.A. Design LLC v. Capella Space Corporation lawsuit.

Capella is getting sued by MMA for allegedly stealing MMA's antenna. The lawsuit seems really nasty as far as I can tell. Excerpts from the "PLAINTIFF M.M.A. DESIGN LLC'S RESPONSE IN OPPOSITION TO DEFENDANT CAPELLA SPACE CORPORATION'S MOTION TO DISMISS CLAIMS 1-4 AND 6 OF THE COMPLAINT" below:

"At the direction of Harvey, MMA's CTO and chief technical engineer, MMA proceeded to develop confidential and proprietary flight system requirements for a deployable, high gain reflectarray antenna (or "DaHGR") for Capella ("the Requirements")....

Within weeks, Capella officially broke off its relationship with MMA and immediately hired Harvey to spearhead the exact projects he had been designing for Capella through MMA.... Together Harvey and Capella designed and built the deployable solutions for Capella...

(Harvey telling Payam Banazadeh: "We will need to recreate the IP that I did at MMA in the last few years. The good thing is I know the map now and was exploring before to get the objective."). Due to its use of MMA's trade secrets and proprietary information, Capella obtained a technically complex high gain deployable thin membrane reflectarray antenna far faster and at much lower cost than it otherwise could have done and was able to secure significant funding from external sources it otherwise could not have obtained."

Sources:

https://www.pacermonitor.com/public/case/26213037/MMA_Design_LLC_v_Capella_Space_Corporation_et_al
https://www.courtlistener.com/docket/14628151/mma-design-llc-v-capella-space-corporation/
https://www.law360.com/cases/5bef105001283b268b5824ed
https://unicourt.com/case/pc-db1-mma-design-llc-v-capella-space-corporation-et-al-901728

Online gongora

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Re: Commercial SAR Constellations
« Reply #3 on: 07/08/2019 03:13 am »
Quote
Tyvak - 1012 Remote Sensing License: NOAA Public Summary

System Description:
On August 8, 2018, the Commercial Remote Sensing Regulatory Affairs office of the National
Oceanic and Atmospheric Administration, an agency of the Department of Commerce, granted a
license to Tyvak Nano-Satellite Systems Inc., a subsidiary of Terran Orbital Corporation, to
operate a private, space-based, remote sensing system named Tyvak-1012. Tyvak-1012 is
planned for launch into a ~500 km, circular, mid inclination (~ 45.8° inclination) during the 2019
period. Tyvak-1012 is a Synthetic Aperture Radar (SAR) imaging at a resolution less than 1 m.

Quote
Tyvak - 1022 Remote Sensing License: NOAA Public Summary

System Description:
On February 12, 2019, the Commercial Remote Sensing Regulatory Affairs office of the National
Oceanic and Atmospheric Administration, an agency of the Department of Commerce, granted a
license to Tyvak Nano-Satellite Systems Inc., a subsidiary of Terran Orbital Corporation, to
operate a private, space-based, remote sensing system named Tyvak-1022. Tyvak-1022 is planned
for launch into a 97.7° during the 2020 period. Tyvak-1022 is a Synthetic Aperture Radar (SAR)
imaging at a maximum resolution of 1.25 meters.

This was a DoD test sat that already launched on a recent Rocket Lab flight:
Quote
Public Summary
YK-2018-L1

Licensee:
The licensee is York Space Systems LLC, which is located at 1449 7th Street, Suite 425, Denver, Colorado
80204, USA. Telephone: (720) 253-0464. URL: www.YorkSpaceSystems.com.

General System Description:
The licensed system is a synthetic aperture radar (“SAR”) remote sensing satellite system that will orbit
the Earth in a low earth orbit (“LEO”) at a nominal altitude of 500km and with an inclination of 40˚. The
Harbinger satellite will be capable of obtaining SAR images with a 3m resolution (GSD) and a 50km
swath width. The SAR will operate in the X-Band, TT&C also will be communicated in the S-Band and
data downlink will be in the X-Band.

Offline Steven Pietrobon

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Re: Commercial SAR Constellations
« Reply #4 on: 07/09/2019 06:40 am »
This was a DoD test sat that already launched on a recent Rocket Lab flight:

The inclinations don't match. 40° for Harbinger, 45.8° for Tyvak-1012 and 97.7° for Tyvak-1022.
« Last Edit: 07/09/2019 06:42 am by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Online gongora

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Re: Commercial SAR Constellations
« Reply #5 on: 07/09/2019 01:08 pm »
This was a DoD test sat that already launched on a recent Rocket Lab flight:

The inclinations don't match. 40° for Harbinger, 45.8° for Tyvak-1012 and 97.7° for Tyvak-1022.

Harbinger was launched already, the others are future launches.

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Re: Commercial SAR Constellations
« Reply #6 on: 07/26/2019 10:13 pm »
I missed this story from last year:
[Space News, August 2018] Trident Space’s challenge: Standing out from the crowd of SAR satellite startups
Quote
One would-be player in this sector is Trident Space Inc. of Fairfax, Virginia. It plans to launch its first SAR smallsat in 2021, followed by six more satellites in 2023, and 12 each year thereafter, eventually building a 48-satellite constellation in low Earth orbit.
...
Trident Space is designing the satellites, including the bus structure, payload and electrical power system. ... “We expect to make a final decision on our manufacturing partner this year as we prepare to start the first flight unit for launch in 2020.”
...
Karangelen predicts Trident Space satellites operating in inclined orbits will have higher revisit rates than satellites in sun-synchronous orbits and will be capable of imaging through an eclipse. SAR smallsats will collect images from one-meter to 0.3-meter resolution.
...
 Trident Space recently completed an internal preliminary design review for its SAR smallsats. It concluded that the best option is a 300-kilogram satellite that is compatible with the growing lineup of commercial dedicated and ride-share launch options.



And here is another.
[Space News, July 2019] Japanese SAR startup Synspective reaches $100 million in funding
Quote
Tokyo-based remote sensing company Synspective said July 26 that it had successfully reached $100 million in funding since forming 17 months ago. 

Synspective is planning a constellation of around 25 small, synthetic aperture radar satellites for global coverage of the Earth.
...
Synspective’s first satellite, a 150-kilogram demonstrator, is slated to launch on an Arianespace Vega rocket in 2020, according to the startup.

Offline Tywin

Re: Commercial SAR Constellations
« Reply #7 on: 08/06/2019 09:22 pm »
100 million for this Japanese startup is a lot of money...

It's me o every year the summon of money of the VCs for the SpaceNews is bigger?
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Offline Asteroza

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Re: Commercial SAR Constellations
« Reply #8 on: 08/07/2019 12:04 am »
100 million for this Japanese startup is a lot of money...

It's me o every year the summon of money of the VCs for the SpaceNews is bigger?

Especially since japanese startups are traditionally fantastically underfunded at the angel/VC level compared to their american counterparts. The reverse is when the PE/bank managed funds suddenly pile in though. Everybody is chasing unicorns in this industry right now though, now that you have 2 rich guys effectively enabling the space industry to mature as a logistics system rather than bespoke transportation.

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Re: Commercial SAR Constellations
« Reply #9 on: 08/20/2019 08:54 pm »
Trident Space is doing some airborne testing. WK2XKY

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Re: Commercial SAR Constellations
« Reply #10 on: 10/02/2019 03:13 am »
Umbra intends to launch two test sats in 2020, haven't given launch details yet.
0831-EX-CN-2019

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Re: Commercial SAR Constellations
« Reply #11 on: 10/08/2019 05:35 pm »
https://twitter.com/pbdes/status/1181618858005848065
Quote
Peter B. de Selding @pbdes

@NoosphereGlobal @maxpolyakov's EOS Data Analytics wants to expand into X-/S-band SAR satellite constellation, says has developed prototype for 25-cm w/ in-house deployable reflector part of 50kg payload 150kg sat. Financing/partnerships not disclosed.

https://www.prnewswire.com/news-releases/eos-to-create-its-own-radar-microsatellite-constellation-eos-sar-300934082.html
« Last Edit: 10/09/2019 12:00 am by gongora »

Offline Nertea

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Re: Commercial SAR Constellations
« Reply #12 on: 10/23/2019 10:15 pm »
More info on Umbra Lab (Finally)

 If you actually do the math on http://umbralab.com their power aperture (10 square meter antenna, 60% efficacy, 500w in 50kg total mass.) is incredible - there is nothing else like it.

https://spacenews.com/umbra-opens-up/

Just look at the size of the gold mesh antenna (below).

« Last Edit: 10/23/2019 10:20 pm by Nertea »

Offline Nertea

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Re: Commercial SAR Constellations
« Reply #13 on: 11/07/2019 06:32 pm »
SAR Journal added EOS SAR to their SAR Missions page, EOS SAR's first satellite offers about the same power aperture as Capella Space with a plan to improve their satellites significantly by 2024. I did not realize the same Will Woods (co-founder of Capella Space) is associated with EOS SAR which means he is bringing all his Capella knowledge and relationships to EOS SAR.

SAR startups are turning into a Soap Opera.

http://syntheticapertureradar.com/sar-satellite-missions/

Offline Tywin

Re: Commercial SAR Constellations
« Reply #14 on: 11/07/2019 07:32 pm »
New raised of funding for this SAR companies...

Quote
SAN FRANCISCO — Ursa Space Systems, a geospatial analytics company specializing in applications for synthetic aperture radar (SAR) data, raised $15 million in a Series B funding round led by Razor’s Edge Ventures.


https://spacenews.com/ursa-raises-15-million-in-series-b-funding-round/
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Re: Commercial SAR Constellations
« Reply #15 on: 12/17/2019 04:49 am »
[Space News] Capella Space to launch seven radar satellites in 2020 as it prepares for commercial operations
Quote
WASHINGTON — Space-based radar imagery provider Capella Space will launch seven satellites and start commercial operations in 2020, the company announced Dec. 16.
...
The first satellite, to be named Sequoia, will launch from Cape Canaveral in March into a polar sun-synchronous orbit on a SpaceX rocket. The next three satellites are booked on an Indian Polar Satellite Launch Vehicle flight scheduled for June to a polar sun-synchronous orbit. These would be the first batch of a constellation to be named Whitney.

The next batch of three are being booked to go up late 2020. “We hope to finalize booking in the next few months,” said Banazadeh.

Online gongora

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Re: Commercial SAR Constellations
« Reply #16 on: 01/22/2020 03:19 am »
Capella Space Unveils Advanced Satellite Design to Deliver High Resolution On-Demand Earth Observation Data
Quote
...
A 3.5 meter deployed mesh-based reflector antenna combined with a high power RADAR enable key performance improvements including quality advances.
...
The new satellite design cemented major deals with multiple divisions of the U.S. government, including a contract with the United States Air Force and National Reconnaissance Office (NRO). The technological enhancements will be embedded in Capella's next six commercial satellites, named the "Whitney" constellation, starting with the launch of Sequoia slated for March of 2020. The Sequoia satellite is currently completing system level tests and will arrive at the launch site in early March.

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Re: Commercial SAR Constellations
« Reply #17 on: 02/05/2020 03:44 am »
Capella testing their electronics from an aircraft: "This STA covers testing of an experimental radar in an aircraft test. The radar is for a satellite system, but a short airborne test is needed to test the custom electronics. The spacecraft radar operation is covered by a separate FCC filing (0066-EX-CN-2018)."  The dates are March-August.
0203-EX-ST-2020
« Last Edit: 02/05/2020 03:44 am by gongora »

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Re: Commercial SAR Constellations
« Reply #18 on: 03/03/2020 05:12 pm »
https://twitter.com/pbdes/status/1234896609588207617
Quote
The latest commercial SAR radar startup is @predasar, which just raised $25M seed round led by @Rokk3rFuel. Proceeds to buy 1st 2 sats from @TyvakNanoSat, and just named USAF Maj. Gen. Roger W. Teague, former commander, 4th Space Ops Squadron @SpaceForceDoD, as CEO.

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Re: Commercial SAR Constellations
« Reply #19 on: 03/10/2020 03:21 pm »
https://twitter.com/spacereportr/status/1237042410942758913
Quote
Three retired USAF generals, Gen. William Shelton, Lt. Gen. Richard Newton and Maj. Gen. Douglas Raaberg, joined board for @predasar, radar satellite company that raised $25 million in seed round.

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Offline Nertea

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Re: Commercial SAR Constellations
« Reply #21 on: 06/06/2020 06:36 pm »
Why is OptiSAR excluded from the SARJournals satellite comparison page? There is a lot of information about ICEYE, Capella, and Umbra Labs but not a lot about the new larger satellites.

« Last Edit: 06/06/2020 06:39 pm by Nertea »

Offline TrevorMonty

Re: Commercial SAR Constellations
« Reply #22 on: 06/06/2020 08:13 pm »
The only information I could find on Planet's SAR constellation is call SWIFT from FCC license in april 2018. Unlike most of smallsat SAR competitors they are no longer a startup but well established space company with good revenue stream and most importantly customer base for SAR data.

Offline Nertea

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Re: Commercial SAR Constellations
« Reply #23 on: 06/06/2020 08:50 pm »
I heard the planet SAR constellation was dead

Offline Hog

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Re: Commercial SAR Constellations
« Reply #24 on: 06/07/2020 12:53 pm »
Just to confirm, does SAR in this thread is an acronym for Search And Rescue?
Paul

Offline su27k

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Re: Commercial SAR Constellations
« Reply #25 on: 06/07/2020 01:09 pm »
Just to confirm, does SAR in this thread is an acronym for Search And Rescue?

No, it's "Synthetic Aperture Radar"

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Re: Commercial SAR Constellations
« Reply #26 on: 07/20/2020 02:15 am »
iQPS from Japan.  First satellite launched in 2019, second satellite launching on the SpaceX SSO-1 flight (brokered by Spaceflight Inc.).

https://i-qps.net/
https://i-qps.net/news/316
Quote
The second iQPS small SAR satellite “IZANAMI” to launch on Spaceflight’s SXRS-3 rideshare mission no earlier than December 2020

iQPS Inc., led by its CEO Shunsuke Onishi, with the mission to “expand the possibilities in space and make our earth a better place,” announces the launch of the second small SAR satellite called IZANAMI, which is developed with the space cluster of more than 20 local companies in Northern part of Kyushu.

Under a rideshare launch contract with Spaceflight Inc., the leading satellite rideshare and mission management provider, IZANAMI is scheduled to launch from a SpaceX Falcon 9 no earlier than December 2020. The mission, called SXRS-3 by Spaceflight, is a fully dedicated rideshare mission. Additional information about IZANAMI and its launch will be provided as it becomes available.

iQPS Inc. is aiming to establish a near real-time data provision service by 2025 with 36-satellite constellation which can observe almost any point in the world in approximately 10 minutes, and conduct fixed-point observations at particular areas once every 10 minutes. The first satellite IZANAGI and the second IZANAMI have a mission as the prototype to demonstrate various experimental devices and technology in space for the future iQPS constellation.

“In December 2019, iQPS successfully launched IZANAGI from Satish Dawn Space Centre and established contact with ground stations on the following day.” says Shunsuke Onishi, CEO of iQPS Inc. “The continuous healthy operation of IZANAGI is providing us an accumulation of knowledge to improve IZANAMI and to develop the following satellites faster and with more confidence. And now we, with all iQPS members including the Northern Kyushu space cluster, are excited for the upcoming launch of our 2nd satellite. We look forward to our launch with Spaceflight aboard the Falcon 9.”

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Re: Commercial SAR Constellations
« Reply #27 on: 10/04/2020 01:53 am »
Umbra intro video, shows their folding antenna:

Online gongora

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Re: Commercial SAR Constellations
« Reply #28 on: 10/04/2020 01:55 am »
Article on iQPS, their second satellite is on the SpaceX rideshare in December.
https://spacenews.com/iqps-constellation-plan/

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Re: Commercial SAR Constellations
« Reply #31 on: 01/20/2021 12:43 am »
Capella filed an FCC application for two satellites, Capella-5 & 6, to launch NET April on a SpaceX rideshare to 53 degrees, 550-600km circular orbit.
https://fcc.report/IBFS/SAT-LOA-20210119-00012

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Re: Commercial SAR Constellations
« Reply #32 on: 03/24/2021 12:55 pm »
[Press Release] Japanese Satellite Company Synspective Signs Launch Agreement
with Germany’s Exolaunch to Launch the Second SAR Satellite “StriX-β” on Soyuz-2


Following the successful image acquisition of the first satellite “StriX-α,” the second satellite is scheduled to be launched in late 2021

Tokyo, Japan and Berlin, Germany – March 23, 2021 – Synspective Inc., a SAR satellite data and analytic solution provider, announced a Launch Agreement with the German launch services provider, Exolaunch, to launch the second demonstration satellite “StriX-β” on a Soyuz-2  launch vehicle from Vostochny Cosmodrome in Russia in late 2021.     

StriX-β is the second demonstration satellite following Strix-α. It is aimed to demonstrate “InSAR (Interferometric SAR)” technology in orbit, a special SAR analytics technique to detect millimeter-level displacements on the ground surface.

Under the agreement, Exolaunch will provide launch, mission management, and integration services for the Strix-β satellite that will be delivered to a Synspective’s custom orbit. The Strix-β is the second satellite of a 30 SAR satellite constellation that Synspective plans to build by the late 2020s.

Dr. Motoyuki Arai, founder and CEO of Synspective, said, “We are very pleased to entrust the launch of StriX-β, our second small SAR satellite, to Exolaunch, which has an extensive track record. Synspective has already begun operating its first satellite, as well as providing solution services. We are now entering a phase of business expansion. StriX-β is a crucial satellite to demonstrate InSAR technology and to deepen satellite-operation know-how, which are strengths in our business expansion. We will accomplish this mission and steadily achieve results to enhance global efficiency and resilience.”

Jeanne Medvedeva, VP of Launch Services at Exolaunch, said, “We are delighted to welcome Synspective as our customer and to launch StriX-β with Soyuz-2 known for its outstanding reliability. Synspective is a company with an ambitious mission to revolutionise an Earth Observation market by introducing new SAR technologies and solutions. Exolaunch’s commitment to working with global conscientious companies is the perfect complement to Synspective’s mission of advancing the world through data-driven decisions that have a lasting positive impact. We are proud of being both flexible and authentic, capable of providing on demand launches to requested custom orbits tailored to Synspective’s constellation  needs.”

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Re: Commercial SAR Constellations
« Reply #33 on: 03/25/2021 02:08 pm »

Online gongora

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Re: Commercial SAR Constellations
« Reply #34 on: 04/24/2021 03:58 am »
R2 Space rebranded as Orbital Effects last year.  They were bought in March.

Quote
As described in the transfer of control application, Meta, a Delaware limited liability company, acquired an indirect 61.75% equity interest in R2 Space, Inc. (“R2 Space”) on March 25, 2021.  In connection with this transaction, R2 Space was converted from an S-corporation to a limited liability company and became a wholly-owned subsidiary of R2 Space Holdco, Inc. (“R2 Holdco”).  Meta holds its interest in R2 Space through 100% ownership of Meta Aerospace Holdings 3 LLC, which holds 61.75% of the membership shares of R2 Space.  The remaining shares of R2 Space are held by R2 Holdco, which is in turn held equally by the original 50% co-owners of R2 Space, Reuben Sorensen and Ryan Farris.  Based on their interest in R2 Holdco, each continues to hold 19.125% of R2 Space.   

Meta is controlled by Defense Services Investment Partners II, L.P. (“DSIP II”), a Delaware limited partnership, which holds 77.22% of Meta.  The remaining 22.78% of Meta is held by DSIP Co-Invest A, L.P. (“DSIP A”).  Both DSIP II and DSIP A are ultimately managed and controlled by Oaktree Capital I, L.P. (“OCI”), also a Delaware limited partnership.  OCI is an indirect subsidiary of Oaktree Capital Group, LLC (“Oaktree Capital”), a well-established U.S.-based investment management company headquartered in Los Angeles.  The majority equity interest in Oaktree Capital is held by Brookfield Asset Management, Inc., a Canadian corporation based in Toronto, which holds a 61.8% economic interest.  Voting control of Oaktree Capital, however, remains with the upstream ownership chain ultimately controlled by Oaktree Capital Group Holdings GP, LLC.

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Re: Commercial SAR Constellations
« Reply #35 on: 07/15/2021 01:11 am »
https://twitter.com/umbraspace/status/1415477184383291394
Quote
Our antenna successfully deployed in space.

Offline su27k

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Re: Commercial SAR Constellations
« Reply #36 on: 03/29/2022 02:46 am »
https://twitter.com/jeff_foust/status/1508616144726503424

Quote
Japanese SAR company Synspective has raised $100 million in a Series B round, brining its total raised to date to $200 million. It will use the new funding for building more satellites, data products and global expansion.

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Online gongora

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Offline su27k

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Re: Commercial SAR Constellations
« Reply #39 on: 02/16/2023 04:02 am »
Maxar signs agreement with Umbra for direct access to radar imaging satellites

Quote from: SpaceNews
Maxar has signed a contract with satellite imagery startup Umbra to get dedicated access to the company’s radar imaging constellation, the companies announced Feb. 14.

The partnership will allow Maxar to directly task Umbra’s satellites and integrate synthetic aperture radar (SAR) data into its portfolio of Earth intelligence products and services, Tony Frazier, head of Maxar’s public sector Earth intelligence, told SpaceNews.



https://twitter.com/mouthofmorrison/status/1625479471779180551

Quote
Big day. One of the biggest of my career. Some thoughts in the thread below...



Everybody knows Maxar, but what a lot of people don’t realize is that they are one of the leading experts on SAR in the world (their Ypsilanti office is descended from Willow Run Laboratories/ERIM, the group that more or less invented SAR).



In the preview of the article above that you can see some of our data for the first time ever (exciting in its own right). That’s only a 50cm image, not even close to the highest resolution we are capable of. Even still…looks great next to an optical image. More to come.



The combination of our very high resolution SAR with Maxar’s VHR optical and the fact Maxar customers will be able to acquire them together through existing products is a big deal. Our data goes together like peanut butter and jelly - each enhances the other.



Not to mention Maxar has one of the biggest analytics and professional services branches in the game, which means they’ll be able to offer combined “multi-source” products that use our data under the hood to power seemingly magical user experiences.



Maxar knows some things about us that the rest of the world will find out about soon (mainly what kind of data we are capable of producing and how much of it). They decided to bet big on it. I can’t wait to see what we can do together starting this year.



As for the rest of the market…you may notice some things on our new website. A new brand! Sample data coming soon! Pricing! An explainer of our licensing approach! Hang tight - gonna be a fun few months. https://umbra.space

Offline Tywin

Re: Commercial SAR Constellations
« Reply #40 on: 03/09/2024 01:09 am »
Wow we don't have a thread of this amazing SAR company...

https://twitter.com/mouthofmorrison/status/1765773937135222987

https://umbra.space/
The knowledge is power...Everything is connected...
The Turtle continues at a steady pace ...

Online gongora

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Re: Commercial SAR Constellations
« Reply #41 on: 03/09/2024 01:22 am »
We do have a thread for SAR constellations, although it's been neglected lately.
https://forum.nasaspaceflight.com/index.php?topic=47296.0

[Threads merged.]
« Last Edit: 03/11/2024 12:28 am by zubenelgenubi »

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