As a core component of national information infrastructure, satellite navigation system (GNSS) has deeply penetrated into multiple key fields such as national defense and military industry, aerospace, intelligent transportation, and the Internet of Things. Its positioning accuracy, reliability, and anti-interference ability directly determine the safety and effectiveness of downstream applications. With the comprehensive networking of the world's four major navigation systems, accelerated deployment of low orbit satellite constellations, and the large-scale landing of emerging applications such as autonomous driving and drones, satellite navigation equipment is facing increasingly complex operating environments. Traditional single axis and low dynamic simulation testing can no longer meet the stringent performance verification requirements, and multi axis simulation testing technology is experiencing explosive growth, becoming the core support for promoting the high-quality development of the satellite navigation industry.

1、 Industry background: Satellite navigation upgrade drives testing technology iteration

At present, the global satellite navigation industry is in a critical stage of transformation from "system construction" to "service enhancement" and "scenario adaptation", and the dual changes are jointly driving the upgrade of testing requirements. On the one hand, the navigation system itself continues to iterate, with Beidou-3 GPS、 Galileo and other systems have gradually introduced new frequency points and new modulation methods, and "multi-mode and multi frequency" has become the standard configuration of terminals. At the same time, the navigation enhancement load carried by the low orbit satellite Internet constellations (such as Starlink, China's "State Grid" program) has promoted the development of "high-altitude and low orbit coordination, navigation and tele integration", which has greatly increased the complexity of navigation signals. On the other hand, downstream application scenarios are constantly expanding, from traditional car navigation and mobile positioning to high-end scenarios such as L3/L4 level autonomous driving, hypersonic aircraft, high-precision surveying, and unmanned aerial vehicle inspection. These scenarios pose unprecedented requirements for the dynamic performance, anti-interference ability, and multi-sensor fusion accuracy of navigation devices.

Traditional satellite navigation testing mainly relies on single axis static simulation, which can only verify the positioning performance of the equipment in a single direction and stable state. It cannot simulate the multi-dimensional attitude changes (such as pitch, roll, yaw) and complex motion trajectories of the carrier in actual operation, resulting in significant deviations between the test results and real operating scenarios, making it difficult to detect potential hazards of the equipment in dynamic environments. In this context, multi axis simulation testing technology that can simulate multidimensional motion states and reproduce complex scenes has become the key to breaking the testing bottleneck and ensuring the performance of navigation devices. Its market demand is showing a sustained and rapid growth trend.

In terms of market size, the global GNSS simulator market has exceeded 210 million US dollars by 2025 and is expected to reach 527 million US dollars by 2035, with an average annual compound growth rate of 9.61%. Among them, multi axis simulation related products, as a high-end segment, have a significantly higher growth rate than the industry average; The performance of the Chinese market is more prominent, with a market size of approximately 1.85 billion yuan for GPS signal simulators by 2025, and an average annual compound growth rate of around 12.3% from 2025 to 2030. The growth in demand for multi axis simulation has become one of the core driving forces.

2、 The core driving factors for the growth of demand for multi axis simulation

The explosion of demand for multi axis simulation (mainly three-axis simulation, which can achieve synchronous simulation in pitch, roll, and yaw directions, and some high-end products can be extended to multi axis linkage) is not the result of a single factor, but the inevitable result of multiple forces such as technological iteration, scene upgrading, policy guidance, and market competition.

（1） High end application scenario expansion, forcing testing accuracy upgrade

As the core battlefield for multi axis simulation requirements in the fields of national defense, military industry, and aerospace, their rigid demands continue to be released. In the context of modern information warfare, missile borne, shipborne, and airborne navigation systems need to maintain stable positioning in high-speed, highly maneuverable, and strong interference environments. Multi axis simulation can accurately reproduce the complex attitude changes and dynamic trajectories of aircraft, verifying the performance stability of navigation equipment under extreme conditions. Therefore, the procurement volume of military grade multi axis simulators continues to grow, with a year-on-year increase of 34.6% in domestic military grade simulator procurement in 2023, among which the proportion of multi axis high dynamic aircraft models has significantly increased. In the aerospace field, the Commercial Aircraft Corporation of China (COMAC) C919, the new generation of carrier rockets, and low orbit satellite constellation projects all extensively use high-precision three-axis simulation turntables for satellite payload testing and aircraft navigation system verification. The unit price of high-end models generally exceeds 2 million yuan, and demand continues to rise.

In the civilian field, the large-scale development of autonomous driving and drones has become an important growth pole for the demand for multi axis simulation. The penetration rate of L2 level and above autonomous vehicles has reached 38%, and is expected to exceed 70% by 2030. These vehicles rely on the tight coupling fusion positioning of GNSS and IMU (Inertial Measurement Unit). Multi axis simulation can synchronously provide GNSS signals and three-axis acceleration and direction angle information, accurately verifying the reliability of the fusion algorithm and the positioning accuracy of vehicles in dynamic scenarios such as turning, bumps, and rapid acceleration. Currently, more than 80% of the autonomous driving testing platforms of mainstream domestic car companies are equipped with multi axis related simulation equipment that supports high-precision positioning simulation. In the field of unmanned aerial vehicles, high-precision three-axis simulation turntables have become the core equipment for flight control/inertial navigation system testing, which can simulate the attitude changes of unmanned aerial vehicles during flight and provide reliable support for their comprehensive performance evaluation.

（2） Integrated development of navigation technology to enhance testing complexity

Currently, satellite navigation is evolving from single signal positioning to multi-sensor fusion positioning using GNSS+IMU+visual SLAM+LiDAR. This fusion mode can compensate for the shortcomings of single navigation methods and improve the reliability of positioning in complex environments, but it also significantly increases the difficulty of testing. Multi axis simulation testing can achieve synchronous simulation of navigation signals, inertial measurement, and attitude changes, perfectly matching the testing requirements of multi-sensor fusion positioning. It can simultaneously verify the performance of multiple links such as GNSS signal reception, IMU data acquisition, and fusion algorithm processing, becoming an essential testing method in the development and production process of fusion navigation equipment.

In addition, the popularization of anti-interference and anti deception technologies has also driven the growth of demand for multi axis simulation. With the increasingly complex electromagnetic environment, navigation devices are facing increasing interference risks. Multi axis simulation can simulate complex scenarios such as strong interference, signal deception, multipath effects, etc., to verify the device's anti-interference ability and signal discrimination ability. This demand is particularly prominent in the fields of national defense and communication - for example, 5G base station timing relies on GNSS signals, and the stability of the base station clock module in weak signal and interference environments needs to be verified through multi axis simulation, requiring simulation equipment to have 10ns level time synchronization accuracy testing capability. Meanwhile, the application of Software Defined Radio (SDR) technology in the navigation field enables multi axis simulators to flexibly configure signal systems through software, adapt to testing requirements of different constellations and frequencies, and further enhance their application value.

（3） Policy guidance and localization substitution to stimulate market vitality

Major countries around the world have listed the satellite navigation industry as a strategic emerging industry and introduced multiple policies to promote its technological upgrading and independent controllability. The 14th Five Year Plan and 2035 Vision Outline of China clearly propose to build a global, safe and reliable aerospace information network, with a focus on supporting the localization of satellite navigation core technology research and testing equipment, providing sufficient policy support and financial support for the multi axis simulation industry. Under policy guidance, domestic research institutes and enterprises have increased their R&D investment in multi axis simulation technology, gradually breaking the monopoly of foreign manufacturers (such as Spirent and Keysight) in the high-end market, promoting the performance improvement and cost reduction of domestic multi axis simulators, and further stimulating market demand.

From the perspective of localization progress, more than 20 domestic enterprises have the ability to simulate multiple systems and frequencies with high dynamic capabilities. Some high-end products have a dynamic range of ± 10g acceleration and ± 1000 °/s angular velocity, which can meet extreme testing needs such as hypersonic aircraft. They have strong competitiveness in the mid to low end market, and the process of domestic substitution continues to accelerate, driving the growth of procurement demand for multi axis simulation equipment. At the same time, countries along the "the Belt and Road" have accelerated the construction of satellite navigation infrastructure, and the demand for economic and modular multi axis simulators has increased, providing domestic enterprises with a broad overseas market space.

（4） Testing efficiency and cost optimization, improving the cost-effectiveness of multi axis simulation

Compared to outdoor vehicle and flight testing, multi axis simulation testing has significant advantages such as strong controllability, high testing efficiency, and low cost. Outdoor testing is limited by factors such as weather, location, and regulations, resulting in long testing cycles, high costs, and difficulty in reproducing extreme scenarios; Multi axis simulation can accurately reproduce various complex scenarios in laboratory environments, quickly complete equipment performance verification, fault diagnosis, and iterative optimization, greatly shorten the development cycle, and reduce testing costs. For example, an autonomous driving test vehicle needs to perform hundreds of hours of GNSS signal simulation testing on average during the development cycle. Multi axis simulation equipment can improve the efficiency of this process by more than 30% and reduce outdoor testing costs by more than 50%.

In addition, the intelligent and modular upgrade of multi axis simulation equipment further enhances its cost-effectiveness. Modern multi axis simulators adopt a software defined architecture, supporting multi instance simulation, API external control, and custom signal import. One device can achieve the functions of multiple traditional simulators, while also having real-time closed-loop simulation capabilities with a latency as low as 5ms, which can meet large-scale and efficient testing needs and become an important choice for enterprises to reduce costs and increase efficiency.

3、 Core application scenarios and development status of multi axis simulation technology

At present, multi axis simulation technology has been widely applied in various fields such as national defense and military industry, aerospace, intelligent transportation, high-precision surveying and mapping, forming a diversified application pattern. At the same time, the technical level is continuously iterating and upgrading, developing towards high precision, high dynamics, intelligence, and integration.

（1） Core application scenarios

1.   In the field of national defense and military industry: mainly used for performance testing of missile borne, shipborne, and airborne navigation systems, simulating the attitude changes of weapons and equipment in high-speed maneuvering and complex electromagnetic environments, verifying the positioning accuracy, anti-interference ability, and reliability of navigation equipment, and ensuring its stable operation in battlefield environments; Simultaneously used for testing individual navigation equipment and military drones to enhance their combat capabilities.

2.   In the field of aerospace, it is applied to satellite in orbit simulation, rocket launch navigation verification, civil aviation onboard equipment airworthiness certification, and testing of low orbit satellite constellations. Through multi axis simulation, it reproduces the flight attitude and orbit changes of the aircraft, verifies the collaborative ability of the navigation system with other payloads, and ensures the smooth implementation of aerospace missions.

3.   In the field of intelligent transportation, we focus on the fusion positioning testing of autonomous vehicles, simulate the posture changes of vehicles in urban canyons, high-speed driving, and complex road conditions, verify the positioning accuracy and stability of GNSS/IMU tightly coupled systems, and use them for performance testing of in vehicle navigation terminals to enhance the user experience of products; In addition, it is also used for testing the navigation system of intelligent rail transit to ensure the safety of train operation.

4.   Other fields: In the field of high-precision surveying, it is used for testing the positioning accuracy of surveying instruments, simulating the attitude changes of surveying equipment in complex terrain, and improving the accuracy of surveying data; In the field of IoT and wearable devices, it is used for performance testing of small navigation terminals to meet the testing requirements of low power consumption and small size; In the field of scientific research and education, it is used for teaching and research and development of satellite navigation technology, providing support for technological innovation.

（2） Current Status of Technological Development

Currently, multi axis simulation technology has formed a relatively mature industrial system, with continuous breakthroughs in core technologies and continuous improvement in product performance. In terms of accuracy, the attitude accuracy of high-end multi axis simulators has reached the level of arcseconds, which can accurately reproduce the small attitude changes of the carrier and meet the testing requirements of high-precision navigation equipment; In terms of dynamic performance, some products have an angular velocity range of ± 1000 °/s and an acceleration range of ± 10g, which can simulate extreme dynamic scenarios such as hypersonic aircraft; In terms of synchronization, the synchronous output of GNSS signals, inertial measurement data, and attitude data has been achieved with a synchronization accuracy of microseconds, which is suitable for the needs of multi-sensor fusion testing.

Meanwhile, multi axis simulation technology is upgrading towards intelligence and integration. In terms of intelligence, combining artificial intelligence and big data technology, automatic generation of testing scenarios, automatic analysis and fault diagnosis of testing data can be achieved to improve testing efficiency; In terms of integration, multi axis simulation is integrated with RF interference simulation, environmental simulation (high and low temperature, humidity) and other functions to form a full scenario and full process testing solution, meeting the comprehensive testing needs of complex navigation equipment. For example, the Dexter Safran GNSS simulator can synchronously provide GNSS signals, IMU data and RTK testing capabilities, and can complete multi-dimensional testing without additional equipment, achieving the integration and simplification of the testing system.

However, at the same time, there are also some shortcomings in the industry: firstly, high-end core components (such as high-performance FPGAs, high stability crystal oscillators, RF chips) still rely partially on imports, which poses a risk of being "stuck"; Secondly, there is still a gap between domestic enterprises and foreign manufacturers in algorithm optimization and scene modeling capabilities for high-end multi axis simulation equipment; Thirdly, the testing standards are not yet unified, and there are significant differences in testing requirements among different fields and enterprises, resulting in insufficient universality of multi axis simulation equipment and increased testing costs for enterprises.

4、 Industry Challenges and Future Development Trends

（1） Main challenges

1.   High technical threshold: Multi axis simulation involves multiple fields such as mechanical design, electronic control, navigation simulation, software algorithms, etc., with high technical complexity and high requirements for enterprise R&D and integration capabilities. Most domestic enterprises still focus on the mid to low end market, and high-end product R&D is difficult to meet the high-end testing needs of national defense, aerospace and other fields; At the same time, further breakthroughs are needed in modeling techniques for anti-interference and high dynamic scenarios, and the authenticity and accuracy of testing need to be improved.

2.   Core components rely on imports: High performance FPGAs, RF chips, high stability crystal oscillators and other core components are the key to multi axis simulation equipment. Currently, the performance of related components in China still lags behind the advanced level abroad. Some high-end components rely on imports, which not only increases product costs but also poses supply chain security risks, restricting the high-end development of domestic multi axis simulation equipment.

3.   Inconsistent testing standards: Currently, there is no unified multi axis simulation testing standard worldwide, and there are significant differences in testing indicators and methods in different application fields, resulting in insufficient compatibility and universality of multi axis simulation equipment. Enterprises need to customize development according to the needs of different customers, which increases research and development costs and cycles, and is not conducive to the large-scale development of the industry; Meanwhile, the incomplete testing and certification system has affected the market recognition of domestic equipment.

4.   Market competition is intensifying: With the increasing demand for multi axis simulation, domestic and foreign enterprises are increasing their investment, and market competition is becoming increasingly fierce. Foreign manufacturers dominate the high-end market with their technological and brand advantages; The number of domestic enterprises is rapidly increasing, and the competition in the mid to low end market is intensifying. Some enterprises are seizing the market through low price competition, resulting in a decrease in the overall profit margin of the industry, which is not conducive to technology research and development investment and industrial upgrading.

（2） Future Development Trends

1.   High precision, high dynamics, and high integration have become the core directions: With the continuous improvement of downstream applications' requirements for navigation device performance, multi axis simulation devices will further enhance attitude accuracy, dynamic performance, and synchronization accuracy, while developing towards miniaturization and integration, achieving multifunctional integration and meeting the testing needs of different scenarios; For example, integrating multi axis simulation with RF interference simulation, environmental simulation, data acquisition and other functions to form an integrated testing platform, improving testing efficiency and convenience, while reducing device size and adapting to portable testing needs.

2.   Accelerated localization substitution and continuous breakthroughs in core technologies: Driven by policy support and market demand, domestic enterprises will increase their research and development investment in key technologies such as core components, algorithm optimization, and scene modeling, gradually breaking through foreign technology monopolies and enhancing the performance and competitiveness of domestic multi axis simulation equipment; At the same time, we will strengthen industry university research cooperation, promote the transformation of technological achievements, accelerate the localization process of core components such as chip level atomic clocks and domestic FPGAs, ensure supply chain security, and promote the penetration of domestic equipment into the high-end market. It is expected that in the next 5-10 years, the market share of domestic high-end multi axis simulators will significantly increase to over 50%.

3.   Deepening of intelligent and digital transformation: Combining technologies such as artificial intelligence, big data, and cloud computing, multi axis simulation equipment will achieve intelligent upgrades, capable of automatically generating test scenarios, optimizing test plans, analyzing test data, and improving testing efficiency and accuracy; At the same time, digital twin technology will be widely applied in multi axis simulation testing, constructing virtual testing scenarios, realizing the synergy between virtual testing and physical testing, further shortening the research and development cycle, and reducing testing costs; In addition, the construction of cloud testing platforms will become a trend, achieving remote and large-scale multi axis simulation testing to meet the batch testing needs of enterprises.

4.   Gradually unifying testing standards and promoting standardized development in the industry: With the continuous maturity of the industry, the development and unification of multi axis simulation testing standards will be gradually promoted both domestically and internationally, clarifying testing indicators, testing methods, and certification processes for different application fields, enhancing the universality and compatibility of equipment, and promoting the large-scale and standardized development of the industry; At the same time, industry associations will play a bridging role, promote technological exchanges and cooperation between enterprises, standardize market competition order, enhance the overall quality and competitiveness of the industry, and promote the coordinated development of multi axis simulation industry and satellite navigation downstream application industry.

5.   The application scenarios continue to expand, and market demand is further released: With the continuous popularization of satellite navigation technology, the application scenarios of multi axis simulation will be further expanded. In addition to traditional defense, aerospace, and intelligent transportation fields, it will also penetrate into more fields such as precision agriculture, disaster monitoring, ocean shipping, wearable devices, etc; At the same time, the development of new technologies such as low orbit satellite navigation and integrated communication, navigation, and remote sensing will give rise to new testing needs, driving the continuous growth of the multi axis simulation market. It is expected that by 2030, the scale of China's multi axis simulation related market will exceed 1.5 billion yuan, becoming the core growth pole in the field of satellite navigation testing.

V. Conclusion

The upgrade of satellite navigation testing is an important guarantee for promoting the high-quality development of the satellite navigation industry, and multi axis simulation, as the core of high-end testing technology, its demand growth is the result of the combined effects of technological iteration, scenario upgrading, policy guidance, and market competition. Currently, multi axis simulation technology has entered a period of rapid development, with increasingly widespread applications in fields such as national defense, aerospace, and intelligent transportation. It has become a key support for breaking the bottleneck of navigation device testing and improving product performance.

Although the industry still faces challenges such as high technological barriers, dependence on imported core components, and inconsistent testing standards, with the acceleration of domestic substitution, continuous breakthroughs in core technologies, and deepening of intelligent and digital transformation, the multi axis simulation industry will usher in a broader development space. In the future, multi axis simulation technology will continue to upgrade towards high precision, high integration, and intelligence, deeply integrating with downstream applications of satellite navigation. This will not only promote the improvement of satellite navigation equipment performance, but also provide strong support for the independent, controllable, and high-quality development of China's aerospace information industry, helping China occupy a more advantageous position in the global satellite navigation field.