Tag Archives: Phoenix project

The Quiet Revolution in Space

Orbits around earth. Black dots indicate geostationary orbit (GEO) Blue color indicates low earth orbit (LEO). Image from wikipedia

National security critically depends on space, and the Defense Advanced Research Projects Agency (DARPA)is focused today on creating the capabilities needed to help make that environment a real-time operational domain, DARPA Director Dr. Arati Prabhakar…

“The questions we ask ourselves at DARPA about the space domain … is what would it take to make the space domain robust for everything that we need militarily and for intelligence, and what would it take to make space a real-time operational domain, which it’s not at all today,” the director said, noting that many other nation-states now are active in orbit and space is a domain where conflict is becoming a real possibility.

Through a national security lens, she added, nothing needed from an intelligence or military perspective can be done effectively without access to space. Something as simple as navigation completely depends on GPS in nearly every part of the world and in every operating regime.

In an era of declining budgets and adversaries’ evolving capabilities, quick, affordable and routine access to space is increasingly critical for national and economic security. Today’s satellite launch systems require scheduling years in advance for a limited inventory of available slots and launches often cost hundreds of millions of dollars each. The Defense Advanced Research Projects Agency created its Experimental Spaceplane, or XS-1, program to help overcome these challenges and reduce the time to get capabilities to space. DARPA artist-concept graphics  “Because of the demands on launch, from the day you know you have to put an asset on orbit to the time you can plan on a launch today is still unacceptably long,” Prabhakar said.

Commercial capabilities will help, she added, “but if in a time of war we imagine if we could go to space not in a month or next week but tomorrow, think about how that would completely change the calculus for an adversary that’s thinking about [using an antisatellite] weapon to take out one of our satellites

”With that ambition in mind, DARPA is now starting Phase 2 of its Experimental Spaceplane, or XS-1.“It’s a reusable first stage that’s designed to be able to put 3,000 or 5,000 pounds into low earth orbit … at a very low cost point — a few million dollars — but very significantly the objective on the DARPA program is by the end of the program to fly that spacecraft 10 times in 10 days,” Prabhakar said, “something that’s inconceivable with any of the spacecraft we have today.”

A second piece of the puzzle is what can be done in orbit, she added, referring to low earth orbit, or LEO, an orbit around Earth whose altitude is between 99 and 1,200 miles.

“We’re doing some amazing work with geo[synchronous]-robotics and rethinking [geostationary Earth orbit]-architectures once you have an asset that would allow you to extend the life or do inspection or simple repairs at GEO, which is something you can’t do today.  GEO [geostationary orbit]is a stable region of space 22,370 miles from Earth.  And because GEO is a stable environment for machines — but hostile for people because of high radiation levels — DARPA thinks the key technology there is space robotics.  DARPA’s Phoenix program seeks to enable GEO robotics servicing and asset life extension while developing new satellite architectures to reduce the cost of space-based systems.

The program’s goal is to develop and demonstrate technologies that make it possible to inspect and robotically service cooperative space systems in GEO and to validate new satellite assembly architectures. Phoenix has validated the concept that new satellites could be built on orbit by physically aggregating “satlets” in space, according to DARPA.

Satlets are small independent modules that can attach together to create a new low-cost, modular satellite architecture, DARPA says. Satlets incorporate essential satellite functionality — power supplies, movement controls, sensors and others — and share data, power and thermal management capabilities. DARPA now is working to validate the technical concept of satlets in LEO [Low earth orbit an orbit around Earth whose altitude is between 99 and 1,200 miles.]

Excerpts from  Cheryl Pellerin Director: DARPA Space Projects Critical to Shifting Trajectories , US DOD News, Nov. 22, 2016


How to Unambiguously Identify Zooming Satellites

U.S. military observers can have trouble identifying satellites whizzing overheard in Earth’s crowded space lanes. A new Pentagon effort aims to find the unique visual signatures of individual satellites for quick identification, regardless of whether such satellites belong to friend or foe. The Defense Advanced Research Projects Agency hopes such signatures — remotely seen from ground or space sensors — could even help identify different satellites made by the same manufacturer. But it’s not easy. Satellites’ orbits may often change between overhead passes, and it’s getting more difficult to spot individual satellites in a space becoming more crowded with vehicles, satellites and pieces of leftover space junk.

The DARPA solicitation for an innovative solution from small business, issued April 27, noted, “Some objects are frequently lost, and sometimes serendipitously reacquired without recognition of its previous catalog existence, unless manpower-intensive analysis intervenes.”Any effort to reliably track “active payloads and tumbling objects” and the like would focus on finding each satellite’s physical or “operational” signatures (perhaps signals or movements unique to a certain satellite). Timeliness and speed would be crucial for helping military observers quickly identify satellites that had gone missing and possibly reappeared.

The technology needed here likely would involve some sort of software algorithms that can do automated identification based on satellite signatures. Once such software is created, DARPA envisions passing the testing along to the Joint Space Operations Center, the U.S. military’s center for coordinating space forces and directing space power to support global operations.  DARPA’s focus on satellites also includes the recently launched “SeeMe” effort to deploy dozens of cheap satellites that can provide overhead battlefield surveillance for the U.S. military. The Pentagon afency also has the ongoing “Phoenix” project to try to cannibalize dead satellites and use the parts for new “Frankenstein” satellites.

Military wants to know: Whose satellites are those?, MSNBC.com, May, 3, 2012

See also http://www.dodsbir.net/sitis/display_topic.asp?Bookmark=42609