This GNSS computation project was processed by LEICA Geo Office 8.3

Typical Processing Parameters
-----------------------------
Cut-off angle                : 15^
Ephemeris type (GPS)         : Precise
Ephemeris type (GLONASS)     : Broadcast
Solution type                : Phase Fixed: All Fix
GNSS type                    : GPS
Frequency                    : Iono Free (L3)
Fix ambiguities up to        : 80km
Min. time for float solution : 05'00"
Sampling rate                : 5 Sec
Tropospheric model           : Hopfield
Ionospheric  model           : Computed
Use stochastic modelling     : Yes
Min. dist. stochastic model  : 1km
Ionospheric activity         : Automatic

Rover Station Information
-------------------------
Receiver Type        : ATX1230
Receiver S/N         : 304496
Antenna Type         : LEIATX1230GG    NONE
Antenna Height       : 1.75400
Horizontal Offset    : +0.0000m
Vertical offset      : +0.0000m
Phase Center Offsets :
    Vertical (L1,L2) : +0.1106m, +0.1049m
    East     (L1,L2) : +0.0025m, -0.0005m
    North    (L1,L2)   +0.0004m, +0.0001m



Computation Accuracy Standard and Checking Criteria
---------------------------------------------------

Computation Standard = 10mm + 3ppm

Accuracy Standard (S in mm) = [ 10^2 + (3*L)^2 ]^0.5
                  Maximum S = 30mm (whichever the less)
                    where L = length of baseline in km

Allowable of Checking Control Origin:
      Abs[dLat(obs) - dLat(comp)] < 2*S
      Abs[dLon(obs) - dLon(comp)] < 2*S

Allowable Discrepancy of Repeated Baseline:
      Spread of dLat < 2*2^0.5*S
      Spread of dLon < 2*2^0.5*S
      Spread of dHt  < 2*2^0.5*S*3             ...... See Note 1

Allowable Residuals of Least Squares Network Adjustment:
      Abs[dLat(obs) - dLat(comp)] < 2*S
      Abs[dLon(obs) - dLon(comp)] < 2*S
      Abs[ dHt(obs) - dHt(comp) ] < 2*S*3      ...... See Note 1

Observation Session:
      Minimum 2 sessions
      Minimum 15 minutes per session
      Time Lapse >= 30 minutes on the same or different day
      GDOP <= 5

Reference Station Connection:
      At least 3 independent GPS baselines
      At least 2 reference stations


Note 1: The checking of vertical component is for geodetic survey only.



User Selected Options
---------------------
Computation Accuracy              = 10mm + 3ppm
Maximum Standard Error            = 30mm
Land Boundary Survey Standard     = True
Check Origin                      = True
Reference Station                 = HKOH,HKST,HKSC
Minimum No. of Reference Station  = 2
Minimum No. of Session            = 2
Minimum Session Duration          = 15 minutes
Minimum Interval                  = 30 minutes
Minimum No. of Baseline           = 3
Elevation Mask                    = 15
Maximum GDOP                      = 5
Reject Large GDOP                 = True
Epoch Rate                        = 5 seconds
Divide Observation file for every = N.A.



Two Step Transformation: 2_Step_(21_2_2005)
-------------------------------------------
Ellipsoid A: WGS 1984
 - Semi Major Axis: 6378137.00000
 - Flattening 1/f : 298.25722356300

Ellipsoid B: International (Hayford)
 - Semi Major Axis: 6378388.00000
 - Flattening 1/f : 297.00000000000

Projection : HK1980

Step One: Pre-Transformation - 7P
 - Shift dx    :  162.61900
 - Shift dy    :  276.96100
 - Shift dz    :  161.76300
 - Rotate Rx   :  0.067741"
 - Rotate Ry   : -2.243649"
 - Rotate Rz   : -1.158827"
 - Scale Factor:  1.094239

Step Two:
 - Shift dx    : -0.00015
 - Shift dy    : -0.00002
 - Rotate Rz   :  0.000002"
 - Scale Factor:  0.00733723
