19 août 2020 | International, Aérospatial, C4ISR
WASHINGTON — The U.S. Space Force hopes its prototype low-Earth orbit weather satellites will entice commercial businesses and allied nations to partner up on the project, reducing the cost of delivering critical weather data to the war fighter.
The U.S. Air Force has been trying to replace the aging Defense Meteorological Satellite Program for years, ever since Congress opted to can it in 2015. Two capabilities in particular have proven a challenge for replacement: cloud characterization and theater weather imagery.
But now the Space Force thinks it has the answer. By leveraging the increasingly popular low-Earth orbit architecture demonstrated by SpaceX's Starlink constellation and other experiments, the military believes it can lower the cost of individual satellites, increase the resiliency of the systems and attract new partnerships.
In a recent interview with SpaceNews, Space and Missile Systems Center Portfolio Architect Col. Russell Teehan explained the thinking behind the new approach. The Air Force previously struggled to attract partners due to the sheer cost of the systems, he said. After all, when a single satellite costs more than $700 million, it's difficult to find someone to share the load. That price point forced the Air Force to build exquisite systems, comprised of just a handful of satellites operating in higher orbits. As the Pentagon has come to understand with its other exquisite systems, in wartime this leaves the military's space-based capabilities dependent on just a few satellites that are difficult to defend.
A proliferation low-Earth orbit, or P-LEO, constellation may solve both of those problems. Smaller LEO satellites can deliver the same capabilities at a fraction of the cost per satellite, while the sheer number of targets in the constellation means that the loss of a single satellite isn't crippling.
“The goal is in doing that, that ideally the commercial and allied sector would increase their desire to partner on those activities,” Treehan said. “[T]he activities in the past were generally $700 million-plus individual systems, which forced us into architectures that were [made up of less than five satellites] that were significantly vulnerable if we were in a time of conflict.”
The Space Force is targeting satellites in the $30-50 million range, Treehan added.
The Space Force has issued a trio of prototype contracts this summer for new space-based sensors that can collect cloud characterization and theater weather imagery from low Earth orbit. Raytheon Technologies, General Atomics and Astra are leading separate prototyping efforts after receiving contracts from the Space Enterprise Consortium.
The Space Force is asking for $131 million to continue these efforts in fiscal 2021.
The decision to settle on LEO for this critical weather data follows years of disarray as the Pentagon has worked to find a replacement for the Defense Meteorological Satellite Program, or DMSP. For decades, the military has relied almost entirely on that program for weather data. The first satellite was launched in the 1960s, with the constellation being replenished with updated generations of weather satellites over the years. Today, there are just four DMSP satellites in operation.
But no satellite is built to last forever, and there are no new DMSP satellites coming. As those satellites reach the end of their service life, they leave the two vital gaps of cloud characterization and theater weather imagery.
Foreseeing this problem, Congress in 2015 directed the Air Force to launch a new weather satellite program to replace DMSP. The Air Force began working on a new constellation to launch in 2024, but there was a problem: a four-year gap between the projected end of DMSP's service life in 2020 and the launch of the new satellites.
To fill that gap, the Air Force collaborated with NASA on ORS-8, a satellite to be launched just before DMSP expired. While a contract was awarded to Sierra Nevada Corp. to build that gap-filling satellite, it was protested, rescinded and ultimately canceled by the Air Force after the service determined DMSP's end-of-life date would extend beyond 2024.
In 2019, the Air Force proposed a new solution: a free-flying space vehicle that would operate in low Earth orbit. The Pentagon asked for $101 million to begin the effort in fiscal 2020, with plans to launch it in 2024.
But that plan didn't last the year.
In September, the Air Force told Congress it wanted to scrap the free-flying space vehicle in favor of a new approach. Based on a space-based environmental monitoring capability assessment and strategy review completed in April 2019, the Air Force found it best to switch to an LEO architecture for scalability and increased resilience. Though skeptical, Congress ultimately swapped the funding for the free-flyer space vehicle to the new program.
“Across the board in our weather strategies ... we're looking at multilayers of an architecture, how to most cost-effectively move forward in capability. They can be incrementally delivered over time. So that becomes a mix of large satellites that do missions and smaller satellites that we can launch in order to grow capability over time,” Col. Dennis Bythewood, program executive officer for space development at the Air Force's Space and Missile Systems Center, said in September 2019. “We're finding much more capable sensors being delivered in small packages that we think we can grow mission sets over time. Those are the types of things that we are looking at within our strategy.”
11 avril 2024 | International, Aérospatial
Canadian Forces drone installation to be built in Ottawa – National Defence says exact location will remain secret
28 avril 2020 | International, Aérospatial, Naval, Terrestre, C4ISR
By: Aaron Mehta WASHINGTON — Global defense spending hit $1.917 trillion in 2019, a 3.6 percent increase over previous year figures and the largest increase in one year since 2010, according to the annual report by the Stockholm International Peace Research Institute. The United States remains the world's largest defense spender in 2019, with its $732 billion representing 38 percent of global military spending, SIPRI has reported. That was followed by China ($261 billion, at 14 percent of global total), India ($71.1 billion, at 3.7 percent), Russia ($65.1 billion, at 3.4 percent) and Saudi Arabia ($61.9 billion, at 3.2 percent). All told, the top five nations accounted for 62 percent of overall military spending. “Global military expenditure was 7.2 percent higher in 2019 than it was in 2010, showing a trend that military spending growth has accelerated in recent years,” SIPRI's Nan Tian said in a statement. “This is the highest level of spending since the 2008 global financial crisis and probably represents a peak in expenditure.” Large year-over-year increases were seen in China (5.1 percent), India (6.8 percent), Russia (4.5 percent), Germany (10 percent) and South Korea (7.5 percent). Regionally, military spending increased in Europe by 5 percent, Asia and Oceania by 4.8 percent, the Americas by 4.7 percent, and Africa by 1.5 percent. Combined military spending by the 29 NATO member states was $1.035 trillion in 2019. SIPRI is widely considered to be the authority on military expenditures and exports, having gathered such data for decades. Other key developments, as noted by the researchers: Together, the top 15 countries spent $1.553 trillion, 81 percent of global military spending. All but three countries in the top 15 had higher military expenditures in 2019 than in 2010, the exceptions being the U.S. (15 percent drop), the U.K. (15 percent drop) and Italy (11 percent drop.) Total military expenditures of the 11 countries in the Middle East for which data is available decreased by 7.5 percent to $147 billion, driven in part by an estimated 16 percent drop from Saudi Arabia. That overall percentage also decreased in 2018. SIPRI was unable to calculate totals from Qatar, Syria, the United Arab Emirates and Yemen. Military spending in South America was relatively unchanged from the previous year, coming in at $52.8 billion. Fifty-one percent of that spending, $26.9 billion, came from Brazil. Combined military expenditures from Africa grew by 1.5 percent to an estimated $41.2 billion in 2019, the first time that region saw a spending increase in five years. That includes plus-ups in Burkina Faso (22 percent), Cameroon (1.4 percent), Mali (3.6 percent), the Central African Republic (8.7 percent), the Democratic Republic of the Congo (16 percent) and Uganda (52 percent). Of the 149 countries SIPRI studied, 10 allocated 4 percent or more of their gross domestic product to the military, which the group defines as the “military burden.” Thirteen countries had a military burden of 3 to 3.9 percent of GDP; 24 had a military burden of 2 to 2.9 percent; 65 had a military burden of 1 to 1.9 percent; and 34 allocated less than 1 percent of their GDP to the military. Three countries had no military expenditures in 2019: Costa Rica, Iceland and Panama. https://www.defensenews.com/global/2020/04/27/global-defense-spending-sees-biggest-spike-in-a-decade/
10 mars 2023 | International, Autre défense
The course allows soldiers from any MOS to learn 3D design and printing skills.