ndop_results Structure

Used for both the NDOP and FCAST products. The change rate is always zero in NDOP products. The Signal Quality Index (SQI) is unused in FCAST products. The SQI is a function of the variance of the calculated velocity normalized such that random vectors at half the Nyquist velocity would produce an SQI of zero.

$S Q I = 1 − [ V a r i a n c e E a s t + V a r i a n c e ⁢ N o r t h 2 ] / V n o r m$

Source: product.h

Byte	Size	Contents
0	UINT2	Velocity East in cm/second (DB_VEL2 format)
2	UINT2	Velocity North in cm/second
4	UINT2	Change rate in db/min (DB_CDBZ2 format)
6	UINT1	Signal Quality Index * 256
7	5	<spare>