As a core component of national information infrastructure, Global Navigation Satellite System (GNSS) have deeply penetrated multiple key fields such as national defense, aerospace, intelligent transportation, and the Internet of Things. Their positioning accuracy, reliability, and anti-interference capabilities directly determine the security and effectiveness of downstream applications. With the full-scale networking of the four major global navigation systems, the accelerated deployment of low-Earth orbit satellite constellations, and the large-scale implementation of emerging applications such as autonomous driving and drones, the operating environment faced by satellite navigation equipment is becoming increasingly complex. Traditional single-axis, low-dynamic simulation testing can no longer meet the stringent performance verification requirements, leading to an explosive growth in multi-axis simulation testing technology, which has become a core support for promoting the high-quality development of the satellite navigation industry.

I. Core Drivers of Growth in Multi-Axis Simulation Demand

The surge in demand for multi-axis simulation (primarily three-axis simulation, capable of simultaneous simulation in pitch, roll, and yaw directions, with some high-end products extending to multi-axis linkage) is not the result of a single factor, but rather an inevitable outcome driven by multiple forces, including technological iteration, scenario upgrades, policy guidance, and market competition.

(i) The expansion of high-end application scenarios is forcing an upgrade in testing accuracy.

The defense, military, and aerospace sectors, as core areas for multi-axis simulation needs, continue to see a surge in demand. In the context of modern information warfare, missile-borne, shipborne, and airborne navigation systems must maintain stable positioning under high-speed, high-maneuverability, and highly jammed 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. In the aerospace field, high-precision three-axis simulation turntables are extensively used in COMAC's C919, new-generation launch vehicles, and low-Earth orbit satellite constellation projects for satellite payload testing and aircraft navigation system verification.

In the civilian sector, the large-scale development of autonomous driving and drones has become a significant growth driver for the demand for multi-axis simulation. Level 2 and above autonomous vehicles rely on tightly coupled fusion positioning of GNSS and IMU (Inertial Measurement Unit ). Multi-axis simulation can simultaneously provide GNSS signals and three-axis acceleration and heading angle information, accurately verifying the reliability of the fusion algorithm and the positioning accuracy of the vehicle in dynamic scenarios such as turning, bumps, and rapid acceleration. In the drone field, high-precision three-axis simulation turntables have become core equipment for flight control/inertial navigation system testing, simulating the attitude changes of drones during flight and providing reliable support for their comprehensive performance evaluation.

(ii) The integrated development of navigation technologies increases the complexity of testing.

Currently, satellite navigation is evolving from single-signal positioning to multi-sensor fusion positioning using GNSS, IMU, visual SLAM, and LiDAR. This fusion model can compensate for the shortcomings of single navigation methods and improve positioning reliability in complex environments, but it also significantly increases the testing difficulty. 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 aspects such as GNSS signal reception, IMU data acquisition, and fusion algorithm processing, becoming an essential testing method in the research and development and production of fusion navigation equipment.

Furthermore, the widespread adoption of anti-interference and anti-spoofing technologies has also driven the growth in demand for multi-axis simulation. As the electromagnetic environment becomes increasingly complex, navigation devices face ever-increasing interference risks. Multi-axis simulation can simulate complex scenarios such as strong interference, signal spoofing, and multipath effects, verifying the device's anti-interference capabilities and signal discrimination capabilities.

(iii) Optimize testing efficiency and cost to improve the cost-effectiveness of multi-axis simulation

Compared to outdoor vehicle and flight testing, multi-axis simulation testing offers significant advantages such as high controllability, high testing efficiency, and low cost. Outdoor testing is limited by factors such as weather, venue, and regulations, resulting in long testing cycles, high costs, and difficulty in reproducing extreme scenarios. In contrast, multi-axis simulation can accurately reproduce various complex scenarios in a laboratory environment, enabling rapid performance verification, fault diagnosis, and iterative optimization of equipment, significantly shortening the R&D cycle and reducing testing costs.

Furthermore, the intelligent and modular upgrades of multi-axis simulation equipment have further improved 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 perform the functions of multiple traditional simulators, while also possessing real-time closed-loop simulation capabilities with latency as low as 5ms. This meets the needs of large-scale, high-efficiency testing, making it an important choice for enterprises to reduce costs and increase efficiency.

II . Core Application Scenarios and Current Development Status of Multi-Axis Simulation Technology

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

(i) Core Application Scenarios

1. 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 under 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; it is also used for testing individual soldier navigation equipment and military drones to improve the combat capabilities of equipment.

2. Aerospace field: It is used for satellite on-orbit simulation, rocket launch navigation verification, airworthiness certification of civil aviation airborne equipment, and testing of low-Earth orbit satellite constellations. Through multi-axis simulation, it reproduces the flight attitude and orbital changes of the aircraft, verifies the collaborative working capability of the navigation system with other payloads, and ensures the smooth implementation of aerospace missions.

3. Intelligent Transportation: Focusing on the fusion positioning test of autonomous vehicles, simulating the attitude changes of vehicles in urban canyons, high-speed driving, and complex road conditions, verifying the positioning accuracy and stability of the tightly coupled GNSS/IMU system, and also used for the performance testing of in-vehicle navigation terminals to improve the user experience of the products; in addition, it is also used for the testing of navigation systems for intelligent rail transit to ensure the safety of train operation.

4. Other fields: In the field of high-precision surveying and mapping, it is used for positioning accuracy testing of surveying instruments, simulating the attitude changes of surveying equipment in complex terrain, and improving the accuracy of surveying data; in the fields of Internet of Things 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 fields of scientific research and education, it is used for teaching and research and development of satellite navigation technology, providing support for technological innovation. 

(ii) Current Status of Technological Development

Currently, multi-axis simulation technology has formed a relatively mature industrial system, with continuous breakthroughs in core technologies and sustained improvement in product performance. In terms of accuracy, the attitude accuracy of high-end multi-axis simulators has reached the arcsecond level, enabling precise reproduction of minute attitude changes of the carrier and meeting the testing requirements of high-precision navigation equipment. In terms of dynamic performance, some products can achieve an angular rate range of ±1000°/s and an acceleration range of ±10g, simulating extreme dynamic scenarios such as hypersonic aircraft. In terms of synchronization, synchronous output of GNSS signals, inertial measurement data, and attitude data has been achieved, with synchronization accuracy reaching the microsecond level, adapting to the needs of multi-sensor fusion testing.