Frequency ratio bidirectional transmission-based distributed system frequency synchronization method
A distributed system, frequency synchronization technology, applied in the direction of synchronization device, radio wave measurement system, radio wave reflection/re-radiation, etc. precision, etc.
Active Publication Date: 2020-09-22
BEIJING INSTITUTE OF TECHNOLOGYGY
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However, the above two methods ignore the difference between the actual sampling rate and the apparent sampling rate caused by the frequency deviation of the crystal oscillator, and also ignore the Doppler frequency difference between the two stations caused by the frequency deviation of the two stations, resulting in deviations in frequency synchronization. imprecise
It can be seen that there is currently a lack of a distributed system deviation-free frequency synchronization method
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[0048] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.
[0049] Taking the dual-station configuration distributed system as an example, a method for frequency synchronization of a distributed system based on frequency ratio two-way transmission provided by the present invention is described in detail, as shown in figure 1 As shown, the method includes the following steps:
[0050] S1: Randomly select one substation as the reference substation, and another substation as the synchronous substation, and the reference substation and the synchronous substation transmit and receive synchronization signals with each other, such as figure 2 shown;
[0051] S2: After the reference sub-station demodulates and derives the synchronizat...
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The invention provides a frequency ratio bidirectional transmission-based distributed system frequency synchronization method, which comprises the following steps of: in order to realize inter-stationfrequency synchronization, oppositely transmitting a synchronization signal between a reference sub-station and a synchronization sub-station to establish a synchronization link; then, obtaining theinter-station frequency ratio by measuring the instantaneous frequency of the bidirectional synchronization signal, and finally, adjusting the working frequency of the synchronization substation in real time by taking the frequency of the reference substation as the reference, so that the frequency synchronization of the distributed system is realized; or, eliminating the influence of frequency deviation by adopting the time delay and the phase difference of the synchronization signal to obtain the same effect as the non-deviation frequency of the distributed system, and indirectly realizing the frequency synchronization of the distributed system; and therefore, the method is suitable for distributed system frequency synchronization of various platforms and application scenes, and is particularly suitable for the fields of distributed radars and the like.
Description
technical field [0001] The invention belongs to the technical field of radar imaging, and in particular relates to a distributed system frequency synchronization method based on frequency ratio two-way transmission. Background technique [0002] Distributed system refers to a system composed of multiple sub-stations that are separated from each other, and uses independent crystal oscillators to provide local clocks and frequencies. Distributed systems are widely used in wireless communication, radar detection, navigation and other fields. For example, in the field of radar, distributed radar can realize all-day and all-weather detection and imaging of areas of interest or targets, and is widely used in fields such as terrain exploration and battlefield reconnaissance. Compared with single-base radar, distributed radar with dual and multi-base configuration can effectively improve radar detection capability, reliability, and flexibility, and realize multi-angle, multi-baseli...
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Login to View More IPC IPC(8): G01S13/00G01S13/89H04W56/00
CPCG01S13/003G01S13/89H04W56/0015H04W56/0035
Inventor 曾涛王岩丁泽刚李凌豪
Owner BEIJING INSTITUTE OF TECHNOLOGYGY