CW25 Software User Manual Page 26 of 50 Rev 03 Date: 06/16/08Copyright ©2007 NavSync Ltd.All Rights Reserved Specifications subject to change without notice.8.3.2 PRTH, DYNA: RECEIVER DYNAMICSPurposeThis message Sets, Queries and Responds to the receiver host dynamics and hence the maximum receiver trackingdynamics expected.The degree of filtering performed by the navigation and timing Kalman filter is dependant on the selected receiver platform.Query Format$PRTHQ,DYNA[*checksum]Set Format$PRTHS,DYNA,platform[*checksum]Response / Acknowledge Format$PRTHR,DYNA,platform*Explanation of Parametersplatform receiver platform (integer, range 0 – 10)0 = Fixed base station, Timing and Frequency modes etc1 = Stationary, but unknown position2 = Man pack / walking3 = Automotive / Land Vehicle4 = Marine5 = Airborne, Low dynamics (<1g) — Limit of CW256 = Airborne, Medium dynamics <2g)7 = Airborne, High dynamics (<4g)8 = Airborne, Very High dynamics (<8g)9 = Drone, Missile dynamics (<16g)10 = Pure least squares mode (ie semi-infinite dynamics assumed)Default for CW25-NAV is 3, maximum is 5. Default for CW25-TIM is 1 and changes to 0 after 10 minute locationsurvey completed, maximum is 5.8.3.3 PRTH, ITIM: INITIALISE TIME AND DATEPurposeThis message Sets, Queries and Responds to the user initialised time and date. Two input options are available, oneallowing a calendar date and GMT time to be input and the other a GPS week number and seconds of week.The input date is acted upon regardless and is primarily used to set the GPS week inside the receiver. The time inputwill not be used if is set to zero, or if the receiver is currently tracking any satellites and therefore already has a goodsub-millisecond knowledge of time.If the time input is not used then the Response message returns the values used or assumed instead of those input.The time RMS accuracy is used to decide how much importance to put on the input values and should be set with care.Query Format$PRTHQ,ITIM[*checksum]Set FormatUsing a GMT time format$PRTHS,ITIM,timeRMS,GMT,day,month,year,[hours],[minutes],[seconds] [*checksum]Using a GPS time format$PRTHS,ITIM,timeRMS,GPS,gps_week,[gps_time][*checksum]Response / Acknowledge Format$PRTHR,ITIM,timeRMS,GMT,day,month,year,hours,minutes,seconds,GPS, gps_week,gps_time*Explanation of Parameterstime RMS RMS accuracy of the input time-tag (seconds)(floating point, range 0 – 999999.0).day day of month (integer, range 1 – 31).month month of year (integer, range 1 – 12).year 4 digit year (integer, range 1980 – 2047).hours hours of day (integer, range 0 – 23).minutes minutes of hour (integer, range 0 – 59).seconds seconds of minute (floating point, range 0 – 59.999).gps_week GPS week number, including pre GPS roll-over weeks, eg 1037 (integer, range 0 – 32768)gps_TOW GPS Time of Week in seconds (floating point, range 0.0 –604800.0).
