Precision RF testing for satellite hardware
Conducting RF testing on flight hardware presents distinct challenges inherent to the space industry. The process necessitates measurements with antennas attached to the complete satellite, leading to larger and more complex measurement systems compared to those used in other applications. Additionally, these antennas are typically fragile and sensitive to gravitational forces. Therefore, minimizing or ideally avoiding any movement of the antennas during testing is crucial for two primary reasons:
Firstly, it mitigates the risk of damage to the antennas; secondly, it allows for deployment in relation to a fixed gravity vector. Potential deformations of the antenna can be anticipated or corrected under such conditions, enabling characterization of the antennas in a stable and predictable state.
Planar near-field test systems offer an optimal solution for testing these antenna types, as they allow the test equipment to be operated and maintained in near-perfect isolation from the flight hardware under evaluation. NSI-MI's range of Vertical and Horizontal Planar Near-Field Systems can be tailored to fit various size specifications, frequency ranges, and measurement requirements essential for characterizing satellites along with their integrated antennas and communication payloads.
Beyond merely measuring antenna patterns on flight hardware antennas, several system-level parameters must also be evaluated. These parameters include:
Saturating Flux Density (SFD)
Gain-Over-Noise-Temperature (G/T)
Complex Channel Response (Gain-Frequency Response [G(f)] and Group Delay [GD])
Traditionally, these system-level parameters for full-sized satellites have been measured using Compact Antenna Test Range (CATR) systems. However, integrating contemporary satellite systems into a CATR presents significant challenges due to their increasing size and complexity. To address this issue, NSI-MI has developed the Active Antenna Test Suite (AATS). The AATS facilitates the direct measurement of key system metrics within near-field systems, thereby eliminating the need to transfer satellites between facilities and enabling stationary characterization. Key features of the AATS hardware and software kit include:
System-level uplink characterization support (G/T, SFD)
System-level downlink characterization support (EIRP)
Options available for frequency-translating AUT support Customizable User Interface Complete automation of measurement processes and processing of system-level metrics
For more information on AATS, visit Active Antenna Test Suite
