Satellite Antenna Testing Satellite Antenna Testing

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:

Equivalent Isotropic Radiated Power (EIRP)
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:

Full end-to-end characterization of complex channel responses
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

The applications illustrated below serve as examples of flight hardware evaluated using NSI-MI Satellite Test Systems. Each instance includes a hyperlink directing to the particular type of test system utilized.
Iridium NEXT

Iridium NEXT

Iridium NEXT

Tested with Spherical Near-Field System

Read more
Galileo IOV

Europe Galileo Satellite

Europe Galileo Satellite

Tested with 6.7 x 6.7 m (22 x 22 ft) Horizontal Planar Near-Field System

Read more
Haiyang Maritime Satellite

HaiYang-2 Maritime Satellite

HaiYang-2 Maritime Satellite

Tested with 3.6 x 3.6 m (12 x 12 ft) Vertical Planar Near-Field System

Read more
Fengyun

Fengyun Satellite

Fengyun Satellite

Tested with 2.4 x 2.4 m (8 x 8 ft) Vertical Planar Near-Field System

Read more
Dawn solar panel

Globalstar I

Globalstar I

Tested with 6.7 x 6.7 m (22 x 22 ft) Horizontal Planar Near-Field System

Read more
Soyuz

Globalstar II

Globalstar II

Tested with 6.7 x 6.7 m (22 x 22 ft) Horizontal Planar Near-Field System

Read more
Iridium Satellite

Iridium

Iridium

Tested with 0.9 x 0.9 m (3 x 3 ft) Vertical Planar Near-Field System

Read more
Radarsat

Radarsat I

Radarsat I

Tested with 18 x 5 m (59 x 16 ft) Vertical Planar Near-Field System

Read more
RADARSAT

Radarsat II

Radarsat II

Tested with 18 x 5 m (59 x 16 ft) Vertical Planar Near-Field System

Read more
Intelsat

Intelsat 30

Intelsat 30

Tested with 12.2 x 6.7 m (40 x 22 ft) Horizontal Planar Near-Field System

Read more
Atlas IIAS with Intelsat

Intelsat 31

Intelsat 31

Tested with 6.7 x 6.7 m (22 x 22 ft) Horizontal Planar Near-Field System

Read more
Echostar

Echostar 3

Echostar 3

Tested with 14.0 x 7.9 m (46 x 26 ft) Horizontal Planar Near-Field System

Read more
Moonmir

Astrolink

Astrolink

Tested with 12.2 x 9.1 m (40 x 30 ft) Horizontal Planar Near-Field System

Read more
Inmarsat-3

Inmarsat

Inmarsat

Tested with Spherical Near-Field System

Read more
Swas

SWAS

SWAS

Tested with 0.9 x 0.9 m (3 x 3 ft) Vertical Planar Near-Field System

Read more
UARS

Microwave Limb Sounder (MLS)

Microwave Limb Sounder (MLS)

Tested with 2.4 x 2.4 m (8 x 8 ft) Vertical Planar Near-Field System

Read more
GPM

GPM Spacecraft

GPM Spacecraft

Tested with 3.6 x 2.7 m (12 x 9 ft) Vertical Planar Near-Field System 

Read more
Tracking and Data Relay

TDRSS

TDRSS

Tested with 6.7 x 6.7 m (22 x 22 ft) and 12.2 x 6.7 m (40 x 22 ft) Horizontal Planar Near-Field System

Read more
Mars Science Laboratory

Mars Science Laboratory (MSL)

Mars Science Laboratory (MSL)

Tested with 3 m (9.8 ft) Spherical Roll over Azimuth Near-Field System

Read more
Alphasat

Alphasat

Alphasat

Tested with 2 m (6.6 ft) Spherical Roll over Azimuth Near-Field System

Read more