In traditional Global Navigation Satellite System (GNSS) receiver testing, R&D and test engineers typically establish a “closed-loop” conductive connection between the simulator and the receiver using high-frequency RF cables. This traditional conductive testing method has proven highly effective in verifying performance metrics such as receiver sensitivity, satellite acquisition speed, and basic positioning algorithms, and remains one of the most widely used and mainstream standard testing methods in the global navigation and positioning industry today.

However, when dealing with Controlled Reception Pattern Antenna (CRPA) arrays that require spatial filtering to eliminate external interference sources, or in operating conditions where the installation environment—such as reflections from the aircraft fuselage surface, physical distortion of the antenna radome, conventional direct cable connection solutions prove inadequate and are fundamentally incapable of accurately reproducing the true, complex spatial physical field environment. How can we utilize anechoic chamber technology—commonly known in the industry as “starry sky” multi-antenna radiation testing—in a controlled laboratory setting to to precisely reconstruct the three-dimensional spatial geometry and phase relationships between satellite signals and interference sources, and to perform real-time closed-loop verification of the physical coupling and phase characteristics among antenna elements, has become a new core challenge in the field of high-precision navigation testing. In particular, with the rapid rise of the low-altitude economy (such as unmanned aerial vehicles (UAVs) and electric vertical takeoff and landing (eVTOL) aircraft) in Hong Kong and Southeast Asia in recent years, the industry has placed significant emphasis on physical field simulation technologies for such extreme environments.

In addition to providing standard GNSS simulator solutions, Hongke has collaborated closely with leading global partners to launch a brand-new, high-precision test system designed for simulating real-world GNSS environments and precise phase angles— Skydel Anechoic Simulation SystemThe