Delay Adjustment Method under RF Sampling of Multi-channel Broadband Received Signals

Abstract

The invention provides a method for adjusting the time delays of multiple broadband receiving signals. The method may solve a problem of time alignment of broadband signal baseband waveforms under to a large time-delay condition. The method is implemented by a technical scheme comprising: decomposing a time delay difference into a coarse grade and a fine grade and performing coarse-fine time delay difference adjustment on a baseband signal subjected to digital down-conversion and an AD sampling signal subjected to analog-to-digital conversion; sending a radiofrequency input signal and a radiofrequency sampling clock which are subjected to analog-to-digital conversion to a serial-parallel conversion ISerdes module to be converted into D parallel low-speed digital signals; obtaining 3*D pieces of data and D pieces of parallel data of a signal sequence by means of the delay of a fine time delay adjusting module; converting the data in to a digital signal by means of multiphase filtering summation of a multiphase down-conversion filtering extraction module; outputting a signal subjected to time delay adjustment of a first antenna, a second antenna, or an array element, decomposing the signal by a time delay decomposing module into the number of time delay periods controlling two coarse time delay adjusting modules and two fine time delay adjusting modules, adjusting the time delay difference of the broadband signals received by a compensation antenna or array element, and aligning the baseband waveforms of the multiple broadband receiving signals in a time domain.

Description

technical field [0001] The invention relates to a method for adjusting time delay of multi-channel broadband receiving signals under radio frequency sampling in a phased array digital multi-beam forming and deep space antenna array system. Background technique [0002] In a common phased array digital multi-beamforming system, the antenna elements receive signals emitted by satellites or aircraft as narrow-band signals; the number of antenna elements used in the system for receiving beamforming is small, and the spatial scale of the entire array distribution is also large. Smaller, the difference in the delay of the received signal to each array element is not large. In this case, the normalized delay difference (the delay difference divided by the baseband symbol period) is small, so the baseband waveform difference in each narrowband signal caused by the delay difference can be ignored, and the difference in the received signal of each array element is mainly reflected in...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a simple structure, low resource consumption, saving circuit operation power consumption, and no need to use the precious FPGA. Multiplier resources can solve the problem of high-precision time alignment of broadband signal baseband waveforms under large delay conditions, and a high-precision and wide-range delay adjustment method based on radio frequency sampling

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