Synchronous Acquisition System for Large Space Channels with High Time Accuracy

Abstract

The invention discloses a high-time-accuracy large-spatial-channel synchronous acquisition system. The high-time-accuracy large-spatial-channel synchronous acquisition system comprises a signal acquisition unit and a plurality of communication nodes, wherein the signal acquisition unit is respectively connected with the communication nodes; the signal acquisition unit comprises a first FPGA module, a signal acquisition module and a signal processing unit, and the first FPGA module is respectively connected with the signal acquisition module and the signal processing unit; the first FPGA module comprises a data packing unit and a clock receiving and processing unit; the communication node comprises a second FPGA module, the second FPGA module comprises a UTC restoring unit, a PPS restoring unit, a DDMTD reference signal restoring unit and a precise time delay adjusting unit; and the UTC restoring unit is connected with the data packing unit, and the PPS restoring unit, the DDMTD reference signal restoring unit and the precise time delay adjusting unit are connected with the clock receiving and processing unit. By adopting the high-time-accuracy large-spatial-channel synchronous acquisition system, the channel measurement accuracy can be improved, and the time synchronous accuracy of the channel measurement is increased from 100ns to a sub-ns scale.

Description

technical field

[0001] The invention belongs to the technical field of communication, and relates to a time synchronization system, in particular to a high time precision large space channel synchronous acquisition system. Background technique

[0002] In order to improve communication quality, technicians have never stopped studying the spatial transmission model of the channel. In research, space and time are two sensitive parameters. When researching a fixed site or a static or slow-moving target, the spatial information is definite, and the temporal information is insensitive. In this case, the time information usually depends on GPS timing, and the synchronous reference clock and trigger signal are transmitted through coaxial cable or optical fiber.

[0003] However, for fast-moving transmitters, it is very important to resolve signals in time and space. Taking in-vehicle communication as an example, two vehicles traveling in opposite directions at a speed of 120Km / h...

Images