NAVSYNC CW25 User Manual - page 24
CW25 Software User Manual
Page
24 of 50
Rev 03
Date: 06/16/08
Copyright ©2007 NavSync Ltd.All Rights Reserved
Specifications subject to change without notice.
Software Configuration and version: channels x taps x FFT points, Software version and date
Time tag information: UTC time in hhmmss.sss format, Software time tag (seconds since switch on), Week number, time of
week, Fix time (number of seconds with 3D fix), No fix time (number of seconds without 3D fix, Clock bias in metres, Clock
drift in metres.
Geod: Latitude, Longitude, Ellipsoidal altitude, Mean sea level altitude
Local: Local grid E,N,U (from initial position), Ground speed, Vertical velocity, Track
Acc: GPS Fix, Fix OK flag, Differential flag, Estimated horizontal accuracy (m), Estimated vertical accuracy (m), Estimated
position accuracy (m), Estimated time accuracy (m), Estimated speed accuracy (m/s), Estimated frequency accuracy (m/s),
HDOP, VDOP, PDOP
Ext T: External input data e.g. from network assistance
Altitude Position Aiding (APA): APA required flag, APA used flag, Measurement, Variance, Residual, Residual quality
Sigs: Instantaneous pseudorange residuals, Accumulated pseudorange residuals, Pseudorange edit count, Instantaneous
doppler residuals, Accumulated doppler residuals, Doppler edit count, Instantaneous delta-range residuals, Accumulated
delta-range residuals, Delta-range edit count.
Reset: Kalman reset flag, Last reset type, Number of solutions since last Kalman reset, Total number of resets, Number of
solutions since last Kalman Q boost, Week number set flag, Time set flag, Sufficient position flag, Skip check flag, Time to
first fix, Time to first fix – ION definition
Satellite Information: Satellite ID, Tracking status (not described), Measurement status, Signal strength (C/No), Mean signal
strength, Lock counter, IODE, Elevation angle, Satellite used in solution flag, Pseudorange residuals, Pseudorange re-
siduals OK flag, Pseudorange residuals edit flag, Doppler residuals, Doppler residuals OK flag, Doppler residuals edit
flag, Delta-range residuals, Delta-range residuals OK flag, Delta-range residuals edit flag
EEPROM Read & EEPROM Write: Non volatile data usage. The characters shown indicate what data has been read or is
written to the EEPROM. a =almanac, e= ephemeris, B=Both (almanac and ephemeris), T=Time, P=Position, H=Height
8.2.2.2 RF & AGC data ($52)
DSP_RF_AGC
1
1
18
0
AGC & Offset Mode, Current Value
0
0
95339
130237 94423
0
0
AGC_counters
0.0
0.0
29.7
40.6
29.5
0.0
0.0
AGC_counters (%)
0.2
DC
offset
(%)
AGC: AGC & Offset Mode 1=Auto, 0=Off, Current value of AGC (0-32)
AGC counters: Shows a table of 7 columns, each column indicates the number of times each level has been encountered
in the last integration period. The columns indicate levels –3, -2, -1, 0, +1, +2, +3. For the example shown above only
three levels are being used so all counts are either –1, 0 or +1.
AGC Counters %: Shows the AGC counters as a percentage. For a 3 level system the optimum AGC setting should have
approximately 27%in +1 and –1 and 46% in 0, this represent a Gaussian distribution.
DC Offset: Shows the amount of imbalance in the measured signal. Ideally the DC offset should be zero, but will show a
slight DC offset of up to a few percent due to the adjustment resolution in the RF front end.