DTIC ADA522577: Precise Measurement Method for Ionospheric pdf

DTIC ADA522577: Precise Measurement Method for Ionospheric

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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. To increase the measurement performance, CRL is planning an upper version of GTR-2 called GTR-3 which uses the phase information of the continuous signals obtained by making a cross correlation or multiplication of the received L1 and L2 P-code signals. BY using the difference of these measured phase values, we can estimate the ionospheric delay with the ambiguities of the periods of L1 + L2 and L1 -L2 signals. As the periods of these signals are about 3 ns and 0.3 ns respectively, then this method has the possibility of TEC measurement with the uncertainty of 1 or 2 times of 10(15) electrons/m(2) of TEC.

Additionally to the precise measurement of TEC, this method has the ability of the precise measurement of the pseudo-range between the GPS satellite and the receiver for the precise positioning

• Creator/s: Defense Technical Information Center
• Date: 12/1/1990
• Year: 1990
• Book Topics/Themes: DTIC Archive, , COMMUNICATIONS RESEARCH LAB IBARAKI (JAPAN) KASHIWA SPACE RESEARCH CENTER, *IONOSPHERE, *MEASUREMENT, *GLOBAL POSITIONING SYSTEM, UNCERTAINTY, CROSS CORRELATION, JAPAN, ELECTRONS, POSITION FINDING, SIGNALS, AMPLITUDE, PRECISION, GAIN, ANTENNAS, ARTIFICIAL SATELLITES, DELAY, COMMUNICATION AND RADIO SYSTEMS, LABORATORIES, VALUE, POSITION(LOCATION), RESEARCH FACILITIES

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