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That, if you think tax avoidance is immoral, is rather like appointing an adulterer to advise the government on how to strengthen the family.This reflects a wider ambiguity about Labour's attitude to business.
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Since an appropriate selection enables the correct resolution of primary wide-lane ambiguities, the selection of the threshold for SNR is the key to group wide-lane ambiguity, and we use the data from Novatel receiver as an example to discuss how to confirm the SNR threshold in this paper.
The SDBR wide-lane ambiguity is directly fixed by rounding with SDBR Hatch Melbourne Wübbena combination; the SDBR narrow-lane ambiguity is directly fixed with LAMBDA method.
Meanwhile, the original MW series for GEO satellite show obvious fluctuations, which also leads to wide-lane ambiguity hard to be fixed.
However, due to the code bias of BDS observations, the float wide-lane ambiguity derived from MW observations may be far away from the expected value and lead to incorrect ambiguity resolution.
Gao et al. (2015, 2015) quoted the partial wide-lane ambiguity resolution strategy to GPS + BDS LC RTK positioning and GPS+ GLONASS + BDS LC RTK positioning and validated with real observations.
Nonetheless, implementing this model is technically subject to how rapidly we can fix wide-lane ambiguities, stabilize narrow-lane UPD estimates, and achieve the first ambiguity-fixed solution.
First, the double-difference wide-lane ambiguities resolved by the Melbourne-Wubbena (MW) method are divided into two categories based on signal-to-noise ratio (SNR).
We find that at least 10 min of observations are required for most receiver types to reliably fix about 90% of wide-lane ambiguities corresponding to high elevations, and over 20 min to fix about 90% of those corresponding to low elevations.
The key step of this method is to form extra-wide-lane (EWL) ambiguity with TF BDS and GPS carrier-phase to reduce the ambiguity search space.
Under the strong scintillation (S4 > 0.6) conditions, it is found that the time series of wide-land (WL) ambiguity NWL and ROGF vary significantly and their range can reach more than 50 cycles and 0.1 m/s, respectively.
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