Mitsubishi Electric Receives JAXA Subsidy to Advance Full Digital Payload Technology for Next-Generation Communication Satellites
Mitsubishi Electric Corporation has been awarded a subsidy under the Japan Aerospace Exploration Agency’s (JAXA) Space Strategy Fund to support the development of an internationally competitive full digital payload for future communication satellites. The initiative is part of JAXA’s “Development and Demonstration of Technologies for Internationally Competitive Communications Payloads” program, financed through the second phase of the Space Strategy Fund.
The Mitsubishi funding represents a significant milestone in Japan’s efforts to strengthen its position in the rapidly evolving global satellite communications market. Mitsubishi Electric had previously been selected as the representative organization for the project and will now proceed with the development of advanced payload technologies designed to deliver greater communication flexibility, enhanced security, and improved operational capabilities for next-generation geostationary satellites.
Addressing Emerging Demands in Satellite Communications
The satellite communications industry is undergoing a profound transformation as governments, businesses, and consumers increasingly seek adaptable and resilient connectivity solutions. Traditional communication satellites have historically relied on hardware-based systems that offer limited opportunities for modification once the spacecraft is launched into orbit. However, changing market conditions, evolving customer requirements, and increasing data traffic have created demand for satellites capable of adapting their capabilities throughout their operational lifetimes.
Modern satellite operators require systems that can dynamically adjust coverage areas, optimize capacity allocation, and respond to fluctuations in demand across different regions and time periods. This need has become particularly important as communication services expand to support broadband connectivity, disaster response, remote operations, mobility applications, and secure government communications.
Geostationary communication satellites remain an essential component of global communications infrastructure because of their ability to provide extensive regional and continental coverage, support broadcasting services, and maintain operations during emergencies or natural disasters. These satellites can deliver stable connectivity across wide geographical areas and play a vital role in ensuring communication continuity when terrestrial networks become unavailable.
Digital communications payloads have emerged as a key technology for enabling satellites to become more flexible and responsive. Through the use of sophisticated digital signal processing technologies and software-defined architectures, these payloads allow operators to adjust satellite functions after launch, thereby maximizing efficiency and extending mission value.
At present, much of the advanced digital payload technology deployed worldwide is developed and manufactured primarily in Europe and the United States. By investing in domestic capabilities, Japan aims to enhance its technological independence while improving the competitiveness of its satellite industry in international markets.
Building on Experience from Engineering Test Satellite-9
Mitsubishi Electric plans to leverage the expertise and technical knowledge accumulated during the development of the Engineering Test Satellite-9 (ETS-9), a project commissioned by JAXA, to advance its new full digital payload initiative.
The Mitsubishi company intends to create a payload architecture capable of combining communication flexibility with robust security features. This next-generation payload is expected to support a broad range of applications and provide operators with the ability to adapt satellite services according to evolving customer requirements.
One of the key objectives is to enable satellites to modify operational parameters while already in orbit. Instead of relying exclusively on fixed hardware configurations determined before launch, future satellites equipped with full digital payloads will be able to update functions through software enhancements and reconfiguration processes.
This capability is expected to significantly improve the efficiency and longevity of communication satellites by allowing them to evolve alongside technological advances and market changes throughout their service lives.
Expanding Coverage with Direct Radiating Array Antennas
A major component of Mitsubishi Electric’s proposed full digital payload architecture is the integration of a Direct Radiating Array (DRA) antenna.
Unlike conventional satellite antennas that depend on reflector systems, DRA antennas consist of multiple antenna elements arranged in a two-dimensional configuration. By transmitting radio waves directly from these elements, the antenna can achieve extensive coverage and potentially address the entire visible portion of Earth from geostationary orbit.
The Mitsubishi use of a DRA antenna offers several advantages, including increased flexibility in beam design and improved adaptability for changing communication requirements. Because all antenna elements participate in beam formation, operators can generate communication beams with customized shapes and coverage patterns.
This capability is particularly valuable for serving regions experiencing temporary increases in demand, supporting emergency communication services, or reallocating resources to areas affected by natural disasters or major events.
However, DRA technology also presents engineering challenges. Increasing the number of antenna elements can enhance beam-forming performance, but it may also lead to larger antenna structures and higher power consumption. Mitsubishi Electric’s development efforts aim to overcome these challenges through optimized system design and advanced semiconductor technologies.
Flexible Communications through Digital Beam Forming
Another important technology underpinning the project is Digital Beam Forming (DBF).
Digital beam forming uses advanced signal processing techniques to control the characteristics of radio signals transmitted and received by multiple antenna elements. By adjusting excitation coefficients digitally, communication beams can be steered toward specific locations or reshaped according to operational requirements.
This capability provides satellite operators with unprecedented flexibility in managing communication resources.
Traditional satellite systems generally have fixed coverage footprints established during the design stage. Once launched, changing these coverage areas can be difficult or impossible. Digital beam forming, by contrast, allows satellites to modify beam configurations dynamically and respond to shifting patterns of user demand.
For example, communication capacity can be redirected to regions experiencing increased traffic volumes during peak hours. Coverage can also be expanded or concentrated depending on the needs of commercial customers, government agencies, or emergency response organizations.
Such adaptability enhances the overall utilization efficiency of satellite assets and helps operators maximize the value generated by each spacecraft.
As global connectivity requirements continue to grow, DBF technology is expected to become a central feature of future satellite communication systems.
Digital Payload Processors Enable In-Orbit Reconfiguration
At the Mitsubishi heart of Mitsubishi Electric’s vision for a full digital payload lies the Digital Payload Processor (DPP).
The DPP functions as a highly sophisticated digital signal processing platform responsible for handling communication signals onboard the satellite. It enables many communication control functions that were traditionally implemented through dedicated hardware to instead be executed through software.
This transition from hardware-defined architectures to software-defined systems offers several significant benefits.
First, communication parameters can be adjusted after launch without requiring physical modifications to the satellite. Operators can introduce new features, optimize performance, and implement service enhancements throughout the spacecraft’s operational life.
Second, software-based architectures allow satellites to support multiple communication scenarios and evolving standards more efficiently.
Third, function updates become easier to implement, helping satellites remain technologically relevant even as communication requirements change over time.
By enabling in-orbit reconfiguration, digital payload processors contribute to longer mission lifetimes, improved cost effectiveness, and greater operational flexibility.
This approach aligns with broader trends across the space industry, where software-defined technologies are increasingly viewed as essential for maintaining competitiveness in a rapidly changing environment.
Advancing Secure Satellite Communications
Security is another critical focus area for Mitsubishi Electric’s full digital payload initiative.
As satellite communications become increasingly integrated into government, defense, commercial, and critical infrastructure applications, the need for secure and resilient communication channels continues to grow.
The Mitsubishi company aims to incorporate technologies capable of concealing communication content and protecting transmitted signals against jamming attempts.
These features are intended to enable highly secure and stable communication services that remain resistant to interception, detection, or interference by unauthorized third parties.
Historically, implementing such advanced security capabilities within satellite payloads has been challenging because they require extremely complex processing and substantial computational resources.
Encryption, signal masking, anti-jamming techniques, and sophisticated waveform processing often involve large amounts of data handling and intensive calculations, making it difficult to deploy these functions efficiently within space-based systems.
Mitsubishi Electric plans to address these challenges by utilizing high-performance application-specific integrated circuits (ASICs).
ASICs are semiconductor devices designed specifically for targeted applications. Unlike general-purpose processors, they are optimized for particular tasks, enabling higher performance and improved efficiency.
Through the use of custom-designed ASICs, Mitsubishi Electric seeks to develop payload systems that are compact, energy efficient, and capable of delivering advanced processing capabilities while meeting the strict size, weight, and power constraints associated with geostationary satellites.
The result could be a new generation of communication satellites offering enhanced security alongside greater operational flexibility.
Collaboration with SKY Perfect JSAT
The project will also benefit from collaboration with SKY Perfect JSAT Corporation, one of Asia’s leading satellite communication operators.
As a participating organization, SKY Perfect JSAT will contribute valuable market insights and operational expertise to the technology development process.
The company plans to investigate potential communication satellite applications expected to emerge during the 2030s and evaluate future requirements for satellite functionality, performance, and service capabilities.
This assessment will include examining evolving customer expectations, anticipated connectivity demands, and emerging use cases across commercial, governmental, and industrial sectors.
By integrating these findings into the design process, Mitsubishi Electric aims to ensure that its full digital payload technology aligns closely with future market needs.
Such collaboration between satellite manufacturers and operators is increasingly important because it helps bridge the gap between technological innovation and practical deployment requirements.
Understanding customer priorities early in the development process can contribute to more effective system designs and improve the commercial viability of new satellite technologies.
Strengthening Japan’s Space Capabilities
The Space Strategy Fund represents an important component of Japan’s broader effort to enhance national competitiveness in the space sector.
Established through collaboration among the Cabinet Office, the Ministry of Internal Affairs and Communications, the Ministry of Education, Culture, Sports, Science and Technology, and the Ministry of Economy, Trade and Industry, the fund supports advanced research, technology demonstration initiatives, and commercialization activities undertaken by private companies and universities.
Through programs such as the development of internationally competitive communications payloads, the fund seeks to accelerate innovation and foster the growth of domestic space capabilities.
For Japan, developing indigenous digital payload technologies carries strategic significance beyond commercial opportunities.
Maintaining domestic expertise in satellite communications contributes to technological sovereignty, strengthens supply chain resilience, and supports national security objectives.
By reducing dependence on overseas technologies, Japan can improve its ability to sustain independent satellite systems while also creating opportunities for international partnerships and exports.
Vision for the Future
Akira Funakoshi, Senior Manager of the Satellite Full Digital Payload Engineering Section within Mitsubishi Electric’s Satellite Electrical Components Department at the Kamakura Works, emphasized the importance of the project for the company and Japan’s broader space ambitions.
According to Funakoshi, Mitsubishi Electric is honored to have been selected as the representative organization for the Space Strategy Fund initiative and to receive financial support for the project.
He noted that the company intends to build upon decades of satellite development expertise to create a full digital payload capable of adjusting its functions flexibly after launch through digital signal processing technologies.
The ultimate objective is to contribute to internationally competitive satellite services and systems while supporting the long-term autonomy and sustainability of Japan’s satellite infrastructure.
As demand for adaptable, secure, and high-capacity communication systems continues to rise worldwide, the successful development of a Japanese full digital payload could position Mitsubishi Electric as a significant player in the global satellite communications industry.
By combining advanced signal processing, digital beam forming, software-defined architectures, and enhanced security technologies, the initiative has the potential to reshape the future of communication satellites and strengthen Japan’s presence in the international space market.
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