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Method for maintaining phase equalization of multichannel receiver by ultra high frequency (UHF) flow measuring radar

A multi-channel, phase technology, applied to the shaping network, radio wave measurement system, instrument and other directions in the transmitter/receiver, can solve the problem of phase inconsistency, achieve the effect of simple debugging, simple algorithm, and improve the phase consistency

Inactive Publication Date: 2013-05-22
SHANGHAI GUOYUE INFORMATION SCI & TECH +1
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Problems solved by technology

[0005] The purpose of the present invention is to propose a digital intermediate frequency phase compensation method for the situation that the phases of the channels of the existing radar digital intermediate frequency receiver are inconsistent

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  • Method for maintaining phase equalization of multichannel receiver by ultra high frequency (UHF) flow measuring radar
  • Method for maintaining phase equalization of multichannel receiver by ultra high frequency (UHF) flow measuring radar
  • Method for maintaining phase equalization of multichannel receiver by ultra high frequency (UHF) flow measuring radar

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Embodiment Construction

[0010] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0011] The accompanying drawing is a block diagram of a digital intermediate frequency phase compensation method of the present invention. As shown in the embodiment of the figure, the method includes:

[0012] After the signal passes through the antenna, the RF calibration signal is obtained, and then through the series-fed waveguide coupler, N channels are obtained through N channels to obtain N-channel IF signals, N-channel IF signals enter the digital IF receiver, and N-channel digital signals are obtained after N-channel A / D sampling , the digital signal is digitally down-converted and orthogonalized in the FPGA. The specific implementation is obtained by quadrature multiplication with the local NCO. The two orthogonal signals are I and Q. These two signals include the down-conversion The phase difference information between the input signal and t...

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Abstract

The invention relates to a digital intermediate-frequency receiver of an ultra high frequency (UHF) river flow rate measuring radar and discloses a digital intermediate-frequency or video phase compensation method. The method for maintaining phase equalization of multichannel receiver by a UHF flow measuring radar includes that a plurality of receiving channels are needed by the UHF flow measuring radar, and an intermediate-frequency signal in each receiving channel has good phase equalization. Phase equalization can be respectively adjusted by simulating automatic gain control (AGC); however, adjustment of phase equalization in the front and the middle of radio frequency and mixing by simulating a circuit is difficult. Phase compensation can be finished through the intermediate-frequency signal when digital downconversion happens, and video signal phases of all ways after downconversion are maintained in consistency. A closed-loop control manner is utilized so that phrase compensation can be finished in a self-adapting mode, and real-time adjustment of consistency of phases of all ways can be achieved. Even the radar is in operation, detection and rectification can be performed in a short time. The method for maintaining phase equalization of multichannel receiver by the UHF flow measuring radar solves the problem that phase inconsistency of signals received by the flow measuring radar affects subsequent signal processing and data processing, and errors of a radar measuring system are reduced. Loop self-adaptation control of the whole process is utilized, phase differences among the channels are compensated, and an intelligent effect is achieved.

Description

technical field [0001] The invention relates to a multi-channel digital intermediate frequency receiver for UHF current measuring radar, especially for occasions where phase consistency of multi-channel received signals is required. Background technique [0002] As we all know, in order to achieve angle resolution for UHF flow measurement radar, the radar receiver usually needs to receive several signals. Taking three receiving channels as an example, the phases of the three channels must be consistent. The radar signal is transmitted through electromagnetic waves, reaches the radar antenna, feeds the antenna, and reaches the digital IF receiver before mixing. It is difficult to keep the phases of the three channels consistent, and it is difficult to adjust the phase compensation at the analog front end. The phase compensation can be completed through digital down-conversion, so that the phases of the three video outputs can be consistent. [0003] At present, in order to ...

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Application Information

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IPC IPC(8): H04B1/16H04L25/03G01S7/285
Inventor 孔凡志谢洪磊陆文斌王少刚
Owner SHANGHAI GUOYUE INFORMATION SCI & TECH
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