Docstring in monostatic Doppler is wrong

[JuergHuber]

The monostatic Doppler docstring says velocity directions are lon/lat/alt (supposedly implying x=lon, y=lat, z=alt):

openburst/openburst/functions/geofunctions.py

Lines 284 to 291 in b1e9e23

	def monostatic_doppler(
	freq, rad_lat, rad_lon, rad_alt, tgt_lat, tgt_lon, tgt_alt, tgt_vx, tgt_vy, tgt_vz
	):
	"""computes Doppler shift in Hz from target motion as seen at ground stationary radar
	freq given in MHz, alts given in masl.
	returns None if tgt V == 0. tgt_V is given as m/s along the lon/lat/z axis
	see Class Target definition
	"""

However, the code shows it is actually x=lat, y=lon, z=alt because gx is the north-component and gy is the east-component:

openburst/openburst/functions/geofunctions.py

Lines 301 to 302 in b1e9e23

	gx = xy_dist * math.cos(az) # [m]
	gy = xy_dist * math.sin(az) # [m]

I suggest to define coordinate systems and conventions in the documentation.