AOA Benchmark Summer 1998 saw the introduction of the next generation of AOA GPS receivers. In its ongoing role to evaluate new GPS products, UNAVCO obtained an AOA Benchmark receiver from JPL and began evaluating its performance as compared to... Read More

The Iridium satellite communication system uses the 1616-1626.5 MHz band to uplink with orbiting communication satellites. UNAVCO Inc. uses iridium communication links to download GPS data from remote GPS stations located at high latitudes. The L1... Read More

While differencing the L2 and L2C carrier phase measurements made with a Javad Sigma receiver, we have observed a banding pattern; the difference between each band is ~0.001116499 cycles. Multiplying the phase by the L2 wavelength we found that 0... Read More

  While differencing the L2 and L2C carrier phase measurements made with a Lecia GR10 receiver, we have observed a banding pattern; the difference between each band is ~0.002047434 cycles. Using the L2 wavelength we found that 0.002047434 cycles... Read More

While differencing the L2-Y and L2C carrier phase measurements made with a Septentrio PolaRx3e receiver, we have not been able to resolve a banding pattern in the differences or estimate the digitizing resolution of the PolaRx3e. This analysis was... Read More

While differencing the L2 and L2C carrier phase measurements made with a Topcon NET-G3A receiver, we have observed a banding pattern; the difference between each band is ~0.002047434 cycles. Multiplying 0.002047434 cycles with the L2 wavelength we... Read More

Digitizing resolution of the Trimble NetR8 receiver While differencing the L2 and L2C carrier phase measurements made with a NetR8 receiver, we have observed a banding pattern; the difference between each band is ~0.0009765625 (1/1024) cycles. This... Read More

Digitizing Resolution of the Trimble NetR9 Reciever While differencing the L2 and L2C carrier phase measurements made with a NetR9 receiver, we have observed a banding pattern; the difference between each band is ~0.0009765625 (1/1024) cycles. This... Read More

While differencing the L2 and L2C carrier phase measurements made with a NetRS receiver, we have observed a banding pattern; the difference between each band is ~0.0039 (1/256) cycles. This banding demonstrates that the digitizing resolution of the... Read More

This article provides a summary of UNAVCO's comparison of the current state-of-the art hardware from 5 major manufacturers. It will include comparisons of receiver data quality in the following areas: double difference phase residual RMS; qualitative... Read More