Updates from Johns notes
20170311
BGTL ramp survey
1509 vehicle data on
1510 moving
1624 still
1719 data off
usual base station, 00k3 and 3vsa with 3vyu running at low rate
3vyd is the vehicle
vehicle antenna: Ashtech 701945-01 rev E
Antenna height measurements for the vehicle:
-mag mount choke-ring antenna was placed on the roof of a GC 6-pack truck
-Antenna height measurements were made to the very top of the antenna housing, w
ith the vehicle loaded as for the survey
-measured height between top of antenna housing and top of chokerings: 3.9 cm
-heights measured on hangar floor surface, smooth and relatively flat
-heights measured with "South" total station, with retro prisms/mounts on the
choke-ring antenna and on the floor adjacent to each tire
-prism mounted on choke-ring: offset from prism center to top of antenna
housing: 143 mm
-prism on floor: offset from prism center to floor surface: 168 mm
-pre-survey measurements: 0.481 m antenna prism height from pax side
-1.448 m floor prism, pax rear
-1.445 m floor prism, pax front
0.505 m antenna prism height from drivers side
-1.428 floor prism, drivers rear
-1.419 floor prism, drivers front
-post-survey measurements: 0.478 m antenna prism height from pax side
-1.450 m floor prism, pax rear
-1.444 m floor prism, pax front
0.507 m antenna prism height from drivers side
-1.424 floor prism, drivers rear
-1.416 floor prism, drivers front
-pre-survey delta-ht: 1.929/1.926 m pax/1.933/1.924 m drivers
1.928 m average all four tires
-post-survey delta-ht: 1.928/1.922 m pax/1.931/1.923 m drivers
1.926 m average all four tires
-overall average delta-ht: 1.927 m (prism to prism)
-overall delta-ht1: 1.952 m (floor to top of antenna housing)
-overall delta-ht2: 1.812 m (floor to bottom of preamp)
-overall LCPC height: 1.858 m (floor to LC phase center)
Kyles notes
Ramp survey 3-11-2017 Thule
Used toyota Hilux with ashtech choke ring on truck with mag base
Measured height using South total station. Choke ring prism mount on top of choke ring and prism + tribrach + wooden board placed on ground for each tire
Kyle was in truck for choke ring prism measurement both sides.
3VYD glonass sigma Javad was used as the rover. Standard base station was the base
1 hour post cal done after the survey parked on ramp
ATS=above total station
BTS=below total station
Pre survey:
Passenger side choke ring measurement = .481m ATS
Passenger side rear tire = -1.448m BTS
Passenger side front tire = -1.445m BTS
Drivers side choke ring measurement = .505m ATS
Driver side rear tire = -1.428 BTS
Driver side front tire = -1.419 BTS
Average height of tire prism (-1.448+ -1.445 + -1.428 + -1.419) / 4 = -1.435m BTS
Average height of choke ring prism (.481 + .505) / 2 = .493m ATS
Total distance separation between prisms = 1.435 + .493 = 1.928m
Post Survey:
Passenger side choke ring measurement = .478m ATS
Passenger side rear tire = -1.450m BTS
Passenger side front tire = -1.444m BTS
Drivers side choke ring measurement = .507m ATS
Driver side rear tire = -1.424 BTS
Driver side front tire = -1.416 BTS
Average height of tire prism (-1.450+ -1.444 + -1.424 + -1.416) / 4 = -1.4335 ->> rounded to 1.434m BTS
Average height of choke ring prism (.478 + .507) / 2 = .4925 -->> rounded to .493m ATS
Total distance separation between prisms = 1.434 + .493 = 1.927m
Shows the truck lowered by 1mm during survey
Items we need to solve:
Choke ring prism height -> choke ring phase center = ??
Tire prism height + tribrach + board -> floor = ??