Enhanced LORAN Receiver (ELR) Kirk Montgomery – Symmetricom/Advanced Timing Solutions 2007 Convention and Technical Symposium - ILA-36 Orlando, Florida.

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Presentation transcript:

Enhanced LORAN Receiver (ELR) Kirk Montgomery – Symmetricom/Advanced Timing Solutions 2007 Convention and Technical Symposium - ILA-36 Orlando, Florida

2 Beta User Group  8 Units completed Sep  Identified a Beta User Group USNOEd Powers NISTMike Lombardi VOLPEJim Carroll STANFORDSherman Lo / Di Qiu CG AcademyCapt Hartnett/Greg Johnson Ohio U? PIGBen Peterson SymmetricomKirk Montgomery  Beta User’s Manual

3 Current Features  E-Field & H-Field Antennas  E-Field – 8 Chains –User selectable DC Voltage levels.  H-Field – 4 Chains –Beam forming –Heading – Antenna –Azimuth – Strongest Signal –Bearing – LDC Station  User selects  Chains  LDC Station  Modes  Timing (Stationary)  Navigation  User I/O  Keyboard/Monitor  Ethernet  Internal Rb  Steered  Uses LDC to recover time  Outputs  1PPS  10Mhz  Tracking Data  Demodulated LDC Messages  NTP  IRIG  Inputs  1PPS  10Mhz  Reference Station (Timing)

4 Block Diagram

5 Hardware Loran Interface Board Single Board Computer DSP Power Supply Main Board Rubidium Analog Board

6 Time/Frequency Recovery  Raw (decimated) measurements from the Loran Data into the filter were stable.  No Corrections  Simply a measure of the Loran Time of Arrival from 8290-X (Gillette WY)  Output from the filter was very stable over the period after the internal clock was locked down  Standard Deviation was ~13nSec over the entire period  The TIC measurement was the difference between the receiver and UTC (Symm)  Note the RCVR “thought” it was holding the internal clock at UTC  It appears that after the clock stabilized, the rcvr did hold to within ~25nSec of UTC.

7 Time/Frequency Recovery

8 Rubidium Performance  Open Loop  Measured Rb performance against the received signal  3 Cesium the Transmitting Stations vs Internal Rb  Drift ~1.468uSec per day (9610-M)  Gillette was ~1.443uSec per day (-20nsec LPA)  Short term stability ~20nSec

9 System Testing  Tracking performance  SZC  ECD measurements  Signal Strength  Cross Rate Interference  E-Field & H-Field Antennas  Looking at the phasing on the H-Field  Orienting the antenna to the NORTH (Stationary) –Rotated the antenna from 0 to 359 degrees in 45 degree steps –Tracked very well

10 Next Steps  Optimize receiver gain  Provide Raw Data (I & Q) over Ethernet  User Interface  Web Interface  Front Panel Interface  Differential Reference Station  Loran Data Channel  Generating & forwarding corrections  Decoding the broadcasted corrections  Closing the loop (integrity)  1PPS Calibration  Tracking Status  Alarms  JAMFEST 2007 (5-9 Nov 2007)