Communications Research Laboratory (CRL) has developed a GPS codeless receiver called GTR-2 for measuring total electron content (TEC) along the line of sight to the GPS satellite by using the cross correlation amplitude of the received P-code signals carried by Ll(1575.42MHz) and 12 (1227.6MHz). This equipment has the performance of uncertainty in the measurement of TEC of about 2 x 10(16) electrons/m(2) when a 10 dBi gain antenna was used. ...
The Radio Research Laboratory (RRL) has been making the international time comparison since 1984 by using a GPS (Global Positioning System) time-transfer receiver which was developed by RRL (GTR-I). Time comparisons are made on a routine base between RRL and US/European organizations by the common-view method to contribute data of the atomic clocks and the primary frequency standard of URL to the TAI. The time-transfer results between RRL and other ...
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