Quality Inspection Flashcards
7 cards from real CST practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Quality Inspection flashcards as text
A GNSS receiver reports a PDOP of 9. What does this indicate?
Answer: Poor satellite geometry and weaker position quality
High PDOP means the satellites are poorly spread across the sky, which degrades position precision.
Before collecting RTK data on a project, what quality control step should the technician perform?
Answer: Occupy a known control point and compare the observed coordinates to published values
A check shot on known control verifies the base setup, datum, and calibration before work begins.
For centimeter-level RTK work, which solution type should the data collector show before storing a point?
Answer: Fixed
A fixed solution means integer ambiguities are resolved, which is needed for centimeter accuracy.
Which practice best reduces GNSS multipath error?
Answer: Setting up away from buildings, vehicles, and other reflective surfaces
Multipath comes from signals reflecting off nearby surfaces before reaching the antenna.
Why are repeat GNSS observations on a control point often scheduled several hours apart?
Answer: To get a different satellite geometry so the observations are independent
A different constellation configuration exposes errors that would repeat if the same geometry were used again.
What is a common quality check for a static GNSS antenna height?
Answer: Measuring before and after the session, in both feet and meters
Measuring in two units and at both ends of the session catches reading blunders and setup settling.
What is a typical elevation mask angle used to exclude low satellites in survey-grade GNSS work?
Answer: 10° to 15°
Low satellites have longer atmospheric paths and more multipath, so they are usually masked out below about 10–15°.