Method for implementing precise nanosecond time synchronization by virtue of global positioning system
A technology of precise time synchronization and global positioning system, which is applied in the direction of satellite radio beacon positioning system, radio wave measurement system, measurement device, etc., to achieve the effect of precise synchronization
Inactive Publication Date: 2013-01-23
INST OF ELECTRONICS CHINESE ACAD OF SCI
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But the 1PPS timing of the general receiver is only tens of nanoseconds
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[0022] A method for nanosecond-level precise time synchronization using a global positioning system according to the present invention specifically includes:
[0023] Step 1: Each receiver receives the original observation data (pseudorange and carrier phase) at the sampling time, and at the same time, the receiver performs single-point positioning by itself to obtain the clock difference value dT of the receiver, and the receiver uses the clock difference to correct the output of 1PPS At the pulse moment, a 1PPS pulse is sent at the same time.
[0024] Step 2: Through the data link, the raw data of the two receivers are jointly calculated for the baseline, and the relative clock difference rdT between the two receivers can be calculated. The calculation principle is similar to the phase difference and will not be described in detail. The rdT accuracy of the general calculation can reach 1-2 nanoseconds.
[0025] Step 3: According to the respective clock differences dT1 and d...
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The invention discloses a method for implementing precise nanosecond time synchronization by virtue of a global positioning system, and relates to the satellite positioning technology. The method comprises steps as follows: processing based on the difference of original data (pseudorange and carrier phase) received by receivers of two global positioning systems (GPS) on real time, so as to obtain the error value in relative time synchronization of the receivers; and then modifying the relative time of each receiver for sending a pulse per second (1PPS) based on the error value in time synchronization, thus obtaining the synchronization error of 1 to 2 nanoseconds after modifying the 1PPS time signals sent by the two GPS receivers. According to the method disclosed by the invention, the internal relations among the relative precise time error of the receiver obtained by virtue of relative positioning, the 1PPS signal time and the internal time of the GPS receivers are ingeniously utilized, so that the relative nanosecond time synchronization can be achieved by utilizing the 1PPS signals of the GPS receivers, and the works of time-difference positioning and precise nanosecond time service are convenient to carry out.
Description
technical field [0001] The invention relates to the field of satellite positioning technology and precise time synchronization, and relates to a method for using a global positioning system to perform nanosecond-level precise time synchronization. Background technique [0002] The accuracy of the internal clock of the GPS receiver is effective, and generally only reaches the millisecond level. However, by using more than 4 satellite pseudo-range measurements for real-time calculation (that is, single-point positioning), the distance between the receiver clock and the satellite clock at each sampling time can be obtained. The difference (that is, the receiver clock difference dT), so that the receiver's clock can be corrected, so the GPS receiver has the function of timing and 1PPS output. However, since the single-point positioning accuracy is generally only 8-10 meters, and the time accuracy (that is, the receiver clock difference) is about 50-70 nanoseconds, the high preci...
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Inventor 尤红建付琨
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI