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Amplitude-comparison angle measurement method capable of eliminating interchannel phase error

A phase error and amplitude angle measurement technology, applied in the field of amplitude angle measurement, can solve the problems of FPGA logic lack of versatility, difficult antenna, etc., to reduce software calculation workload, high accuracy, improve operating efficiency and measurement The effect of angular flexibility

Active Publication Date: 2019-08-02
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The phase error between channels is usually introduced by the different attenuation and delay of the feeder and the device, and it is difficult to completely eliminate it from the antenna production process
[0004] Existing methods for eliminating inter-channel errors include eliminating from the analog side and eliminating from the digital side. Among them, the method of eliminating errors from the analog side is often aimed at the corresponding antenna, and will no longer be applicable after the antenna is replaced; eliminating from the digital side is It refers to adding phase compensation to the initial digital signal through FPGA (Field Programmable Gate Array) on the digital side. However, due to the uncertainty of the phase error between channels due to different antennas, it will lead to the addition of phase compensation. FPGA logic lacks versatility

Method used

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  • Amplitude-comparison angle measurement method capable of eliminating interchannel phase error
  • Amplitude-comparison angle measurement method capable of eliminating interchannel phase error
  • Amplitude-comparison angle measurement method capable of eliminating interchannel phase error

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Embodiment 1

[0061] See figure 1 , figure 1 It is a schematic flowchart of a method for measuring amplitude and angle that can eliminate inter-channel phase errors provided by an embodiment of the present invention. The ratio-amplitude angle measurement method includes:

[0062] S1: Obtain the echo signal reflected by the transmitted signal on the moving target;

[0063] S2: Obtain a sum channel signal and a difference channel signal of the echo signal;

[0064] S3: Perform phase correction on the difference channel signal relative to the sum channel signal to obtain a corrected difference channel signal;

[0065] S4: Obtain the angle value of the moving target according to the ratio of the corrected difference channel signal to the sum channel signal.

[0066] There are many array elements on the front of the sum-and-difference radar antenna, which perform the task of sending or receiving signals at different times. When the antenna sends a signal, all the array elements are used to ...

Embodiment 2

[0111] On the basis of the above embodiments, this embodiment describes in detail the process of obtaining the angle measurement S-curve by simulation. Generally, the analysis of the angle measurement algorithm can be completed by using the two characteristics that electromagnetic waves can propagate in a straight line in a homogeneous medium and that the radar antenna takes the main lobe direction as the radiation direction. The exact expression of the antenna direction function will be very complicated, so some simple functions are usually used instead in the theoretical verification and theoretical description, among which, the sinc function model, the cosine function model and the Gaussian function model are commonly used antenna direction Graph mathematical models.

[0112] In this embodiment, the sinc function model is used as an example to construct an angle-measuring S-curve for angle-measuring angles using the sum-and-difference direction-finding antenna ratio-amplitu...

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Abstract

The invention discloses an amplitude-comparison angle measurement method capable of eliminating interchannel phase error. The amplitude-comparison angle measurement method comprises the following steps: obtaining and transmitting echo signals reflected on a moving object; obtaining the sum channel signals and difference channel signals of the echo signals; carrying out phase correction on the difference channel signals relative to the sum channel signals to obtain difference channel signals after correction; and obtaining the angle value of the moving target according to the specific value ofthe difference channel signals after correction and the sum channel signals. According to the amplitude-comparison angle measurement method disclosed by the invention, the elimination for interchannelphase error is carried out after the moving target is detected, so that the angle measurement accuracy is higher, and the algorithm operation efficiency and angle measurement flexibility are improved.

Description

technical field [0001] The invention belongs to the field of radar, and in particular relates to a method for measuring angles by comparing amplitudes and eliminating phase errors between channels. Background technique [0002] The angle measurement method is a method that uses the amplitude of the echo signal received by the antenna to measure the angle of the moving target. The change of the amplitude is determined by the antenna pattern and the antenna scanning method. There are many array elements on the front of the sum-difference radar antenna used in the ratio angle measurement method, and the tasks of sending or receiving signals are performed at different time periods. When the antenna sends a signal, all the array elements are used to send the signal together, and when the signal is received, the signals of these array elements are recombined, and the sum channel signal, the azimuth difference channel signal and the pitch difference channel signal are generated on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/68G01S7/41
CPCG01S7/418G01S13/68
Inventor 郭亮王冬杰李亚超全英汇李良超孙光才邢孟道
Owner XIDIAN UNIV
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