delay.md

Delay: measurement systems delay

delay.rs exposes several structures

• Delay : a generic delay value, always specified in nanoseconds
• SystemDelay : used by Cggtts to describe the measurement systems delay.

SystemDelay object

+--------+               +---------- system ---------+ +++++++++++
+        +      cable    +------+                      + counter +
+  ANT   + ------------> + RCVR + -------------------> + DUT     +
+--------+               +------+                      +         +
                            ^                          +         +
 +++++++ -------------------| ref_dly                  +         +
 + REF + --------------------------------------------> + REF     +
 +++++++                                               +++++++++++

SystemDelay represents the summation of all delays:

• RF/cable delay
• Reference delay
• System or internal delay, that are carrier dependent

System or internal delays are calibrated against a specific GNSS constellation.