Q1.] What are the true OEMV signal measurement results, and what are the testing conditions under which these measurements are made?
A1.] We measure the double difference PSR (pseudorange) and ADR (carrier phase) RMS, with a zero baseline in a low multipath environment.
Here's a quick list of our measured results (FW 3.200) vs the specifications we publish (all values are RMS):
- L1 C/A Code (Published Specification is < 6cm)
Actual Measured Result = 2.6 cm
- L2 P(Y) Code (Published Specification is < 25cm)
Actual Measured Result = 9.7 cm
- L1 Carrier (Published Specification is < 0.75mm)
Actual Measured Result = 0.386 mm
- L2 Carrier (Published Specification is < 2mm)
Actual Measured Result = 0.858 mm
So the actual results in FW 3.200 are better than our published specifications.
Q2.] Why is the measurement precision of L2 P code (25 cm) greater than L1 C/A code (6 cm)?
A2.] L2 is noisier because of the (proprietary) semi-codeless tracking technique we use. Because we cannot directly track the encrypted military P(Y) code, our semicodeless tracking technique experiences a loss in signal power, and therefore an increase in measurement noise as a result.