A time comparison measuring device and method
A time comparison and measurement device technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as accuracy, poor real-time performance, residual errors, and complex technical difficulties, so as to reduce asymmetric errors and optimize symmetry , the effect of improving adaptability
Active Publication Date: 2019-07-26
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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Problems solved by technology
[0003] The error of the two-way time comparison method mainly comes from the asymmetry of the two-way comparison link caused by various reasons, resulting in the inconsistency of the transmission delay of the two-way link, and the residual error in the differential cancellation process
In order to make up for the asymmetry of the link, the error that can be modeled in the link is usually corrected by data processing; the asymmetry of the two-way comparison link is reduced by adjusting the time-frequency reference, for example, by adjusting the atomic frequency standard The frequency makes the second pulses of the two time comparison nodes closer, thereby reducing the asymmetry of the two-way comparison link, but the technical difficulty of this method is more complicated, the adjustment accuracy and real-time performance are poor, and it is difficult to adapt to complex movements node condition
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[0030] Combine below Figure 1 to Figure 3 To describe in detail the embodiments of the present invention:
[0031] figure 1 It is a system structure block diagram of a time comparison measuring device using an embodiment of the present invention.
[0032] figure 1 Among them, 101 is a complete time comparison measuring device, 102 and 103 are two identical time comparison devices A and B, and 104 is time comparison data processing;
[0033] The first and second time comparison measurement devices 102, 103 can generate and receive time comparison measurement signals with reference to the time-frequency reference signals A and B;
[0034] The time comparison data processing 104 can perform differential processing on the time comparison measurement results generated by the first and second time comparison measurement devices 102, 103, and deduct the transmission time delay, reception time delay and others of the two time comparison measurement devices Errors caused by the si...
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The invention discloses a time comparison measurement device and method, which can adjust the transmission delay according to the time difference data in the two-way time comparison, thereby reducing the asymmetry of the time comparison link and improving the performance of the time comparison. Before the measurement starts, calibrate the transmission delay and reception delay of the time comparison measurement device; perform time comparison, and obtain the time difference data between nodes through time comparison data processing; adjust the transmission delay according to the time difference data, and the time ratio Keep the asymmetry of the link within a certain range; time comparison When the asymmetry of the link is kept within a certain range, perform time comparison to obtain the time difference result.
Description
technical field [0001] The invention relates to two-way time comparison, in particular to a time comparison measurement device and method based on adjustable transmission delay. Background technique [0002] High-precision time comparison has important application value in the fields of time measurement, satellite navigation, communication radar and aerospace measurement and control. As a high-precision time comparison method, the two-way time comparison method has been widely used. Two-way time synchronization The basic principle of the method is to send and receive time comparison signals between two nodes. The two-way transmission link is very close, and its transmission delay has a strong correlation, which can eliminate most of the errors by differential pairing, so as to achieve high-precision time Comparison. [0003] The error of the two-way time comparison method mainly comes from the asymmetry of the two-way comparison link due to various reasons, resulting in the...
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IPC IPC(8): G01S7/40
CPCG01S7/40
Inventor 魏海涛刘轶龙叶红军甘兴利罗显志树玉泉
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP