The VerQuin NISAR/SAR/LiDAR Corner Reflector

Full Assembly
Ground Control Funderpins

The VerQuin corner reflector is the most durable and geodetically stable radar reflector on the market. Its reinforced custom design with braced monumentation, enables survey grade (≤ ±2cm orthometric height) positioning for calibration and validation of active aerial (LiDAR) and space-based (satellite) radar (SAR) platforms to ground-based positioning measurements.  Strategically designed, machined and mounted survey pins (Funderpins – patent pending), which create individual subnetworks of survey points within  each reflector or as a network of reflectors, allow the user to incorporate a variety of direct and indirect measurement techniques such as static or real-time GNSS (Global Navigation Satellite Systems), EDM (Electronic Distance Measurement, i.e. total station), offsets,  and least-squares adjustments.

Figure 1: Full Assembly

Pulling from both geodesy and traditional style survey science, the Funderpins are positioned at the vertices of the trihedral reflector for monitoring orientation (pitch, roll, yaw), deformation, and elevation change within any desired spatial reference frame.

Figure 2: Ground Control and Funderpins

Additional stability and control of pitch, roll, and yaw, are achieved by the leveling and azimuthal control system.  For continuous epoch-by-epoch measurements, position time-series development, and remote monitoring, a cGNSS antenna mount (patent pending) mated to the spine allows for individual use or can be tied directly into the machined offsets of each reflector’s respective subnetwork of survey points, to perform least squares adjustments of any reference point(s) of the reflector.

Figure 3: cGNSS mount

Combining the science of surveying and geodesy, this is the most robustly applicable radar reflector on the market, fitting any desired spatial or temporal resolution, while providing the most geodetically accurate method of tying space-based radar measurements to a topographic surface within any spatial reference system. Solutions, Products and techniques are custom to area of deployment.

Figure 4: SAR and NISAR corner reflectors

Benefits of deploying networks of VerQuin reflectors

  • Improved accuracy and precision of repeat ground-based survey measurements
  • Improved accuracy and precision of aerial and space-based measurements
  • Improved accuracy and precision of interferograms and time-series analyses
  • Improved accuracy and precision of 3-D surficial motion measurements
  • Long-term decadal scale active aerial and space-based Cal/Val +GPS +survey control
  • Real-time cGNSS monitoring