CN-122017764-A - T/R assembly calibration control method

CN122017764ACN 122017764 ACN122017764 ACN 122017764ACN-122017764-A

Abstract

The application relates to the technical field of radar systems, in particular to a T/R component calibration control method, which comprises the steps of sending a calibration signal to a T/R array, enabling each T/R component in the T/R array to generate component state parameters based on the calibration signal, carrying out space correlation analysis on the component state parameters of each T/R component based on the physical layout relation of the T/R array, determining the effective state parameters of each T/R component, and updating the calibration parameters of each T/R component according to the effective state parameters of each T/R component. The application can effectively distinguish the real change of the performance of the T/R component from the environmental interference, and ensure the stability of the calibration parameters in a complex working environment.

Inventors

DU XIAOHUI
ZHANG YUNBO
CHU HAORAN

Assignees

江苏吉凯微波技术有限公司

Dates

Publication Date: 20260512
Application Date: 20260317

Claims (10)

1. A method for controlling calibration of a T/R assembly, the method comprising: Transmitting a calibration signal to a T/R array, and enabling each T/R component in the T/R array to generate component state parameters based on the calibration signal; Based on the physical layout relation of the T/R array, carrying out space correlation analysis on the component state parameters of each T/R component, and determining the effective state parameters of each T/R component; and updating the calibration parameters of each T/R component according to the effective state parameters of each T/R component.
2. The method according to claim 1, wherein the performing spatial correlation analysis on the component state parameters of each T/R component based on the physical layout relationship of the T/R array, and determining the effective state parameters of each T/R component specifically includes: For each T/R component, calculating a component state parameter of the T/R component and a correlation index between component state parameters of corresponding adjacent T/R components of the T/R component in the T/R array; based on the correlation index, a valid state parameter of the T/R component is determined.
3. The method according to claim 2, wherein calculating the correlation index between the component status parameter of the T/R component and the component status parameter of the corresponding adjacent T/R component in the T/R array specifically comprises: Calculating a statistical dispersion between component state parameters of the T/R component and component state parameters of corresponding adjacent T/R components of the T/R component in the T/R array; And based on the statistical dispersion, determining the similarity between the component state parameters of the T/R component and the component state parameters of the adjacent T/R components, and taking the similarity as a correlation index.
4. A method according to claim 3, wherein said determining a similarity between a component state parameter of said T/R component and a component state parameter of said neighboring T/R component based on said statistical dispersion, in particular comprises: Comparing the component state parameters of the T/R component with the statistical median value of the component state parameters of the adjacent T/R components to obtain a comparison result; Determining a decision threshold range based on the statistical dispersion; and when the comparison result is within the judging threshold value range, determining that the similarity between the component state parameter of the T/R component and the component state parameter of the adjacent T/R component is high.
5. The method of claim 2, further comprising, prior to said spatially-dependent analysis of the component state parameters of each T/R component: determining filtering contribution weights of the T/R components based on the spatial distance between the T/R components and a preset reference point, wherein the filtering contribution weights attenuate along with the increase of the spatial distance; Based on the filtering contribution weight of each T/R component, carrying out weighted average on the component state parameters of each T/R component to obtain filtered state parameters of each T/R component; The spatial correlation analysis of the component state parameters of each T/R component specifically comprises spatial correlation analysis of the filtered state parameters of each T/R component.
6. The method according to claim 5, wherein the performing spatial correlation analysis on the filtered state parameters of each T/R component specifically comprises: acquiring an electromagnetic coupling coefficient matrix of the T/R array, wherein the electromagnetic coupling coefficient matrix characterizes electromagnetic coupling strength among T/R components in the T/R array; Calculating parameter offset caused by mutual coupling effect based on the electromagnetic coupling coefficient matrix and the filtered state parameters of each T/R component; subtracting the parameter offset from the filtered state parameters of each T/R component to obtain the mutual coupling correction state parameters of each T/R component; and carrying out spatial correlation analysis on the mutual coupling correction state parameters of each T/R component.
7. The method of claim 6, further comprising, after said determining the effective state parameter of the T/R component based on the correlation indicator: when the component state parameters of the T/R component are identified as outlier parameters, analyzing the time domain fluctuation characteristics and the frequency domain distribution characteristics of the outlier parameters; determining a fault type corresponding to the outlier parameter based on the time domain fluctuation characteristic and the frequency domain distribution characteristic; when the fault type is component hardware fault, marking the T/R component as an unavailable state, and not updating the calibration parameters of the T/R component; And when the fault type is environmental interference, updating the calibration parameters of the T/R assembly based on the mutual coupling correction state parameters of the adjacent T/R assemblies of the T/R assembly.
8. The method of claim 2, wherein determining the corresponding adjacent T/R component of the T/R component in the T/R array is by: identifying a location type of the T/R component in the T/R array; if the position type is an array edge position or an array corner position, creating a virtual T/R assembly outside the boundary of the T/R array based on an array symmetry principle; determining virtual state parameters of the virtual T/R component according to component state parameters of existing T/R components in the T/R array; and the virtual T/R component is included in the selection range of the T/R component selection adjacent to the T/R component.
9. The method of any of claims 1-8, wherein prior to the transmitting the calibration signal to the T/R array, the method further comprises: transmitting synchronous calibration signals to a T/R array, and measuring clock path delay differences and local oscillation phase differences of all T/R components in the T/R array; determining delay compensation parameters of each T/R component based on the clock path delay difference; determining phase compensation parameters of each T/R component based on the local oscillator phase difference; and when the calibration signals are sent to the T/R array, performing digital domain compensation processing on the calibration signals of each T/R component based on the delay compensation parameters and the phase compensation parameters of each T/R component.
10. The method of any of claims 1-8, wherein the component status parameters include a phase error value and an amplitude error value.

Description

T/R assembly calibration control method Technical Field The application relates to the technical field of radar systems, in particular to a T/R assembly calibration control method. Background In phased array radar systems, T/R (Transmit/Receive) component calibration is a key element to ensure radar performance is stable. Phased array radar relies on accurate amplitude and phase control of hundreds or thousands of T/R components to achieve beam forming, scanning, and null generation. Any component amplitude and phase error can cause main lobe gain reduction, sidelobe level increase and beam pointing deviation of an antenna pattern, and seriously affect the detection distance and anti-interference capability of the radar. The existing T/R component calibration control method is all in an attempt to balance the core indexes of calibration precision, instantaneity, system complexity and environmental adaptability. The off-line calibration method is high in precision but not real-time, the internal monitoring method is online and complex in hardware and possibly interrupts tasks, the OTA method is high in system level precision but harsh in implementation conditions, and the blind calibration method is good in real-time but insufficient in reliability. In the conventional technology, a closed loop calibration system based on automatic test equipment and digital signal processing is generally adopted in the T/R component calibration method so as to optimize key parameters such as amplitude, phase and linearity of a transmitting channel and a receiving channel of the T/R component calibration method. However, in complex practical operating environments (e.g., temperature variations, component aging, multipath interference, etc.), conventional static calibration parameters based on ideal laboratory conditions can fail rapidly, resulting in drift in T/R component performance (e.g., amplitude, phase consistency). In particular, when the radar is in a complex electromagnetic environment or in an environment where multipath interference is severe, environmental factors may cause measured state parameters to fluctuate drastically. Conventional calibration algorithms typically employ a simple closed loop feedback mechanism that makes it difficult to distinguish whether such fluctuations are caused by performance drift of the T/R component hardware itself (which is to be calibrated) or by external environmental disturbances (such as multipath effects, clutter, which are not to be calibrated). If the system erroneously recognizes the environmental interference as component performance drift and forcedly updates parameters, not only the performance cannot be improved, but also an erroneous compensation amount is introduced, so that the beam performance is deteriorated and even system oscillation is caused. Therefore, how to accurately peel off the environmental interference and extract the real effective state parameters of the T/R component in a complex dynamic environment is a difficult problem to be solved in the current phased array radar calibration technology. Disclosure of Invention In view of the foregoing, it is desirable to provide a method for controlling calibration of a T/R device that ensures stability of calibration parameters in a complex operating environment. The invention provides a T/R assembly calibration control method, which comprises the following steps: transmitting a calibration signal to the T/R array, so that each T/R component in the T/R array generates component state parameters based on the calibration signal; Based on the physical layout relation of the T/R array, carrying out space correlation analysis on the component state parameters of each T/R component, and determining the effective state parameters of each T/R component; and updating the calibration parameters of each T/R component according to the effective state parameters of each T/R component. In one embodiment, based on the physical layout relationship of the T/R array, performing spatial correlation analysis on component state parameters of each T/R component, and determining effective state parameters of each T/R component specifically includes: for each T/R component, calculating a component state parameter of the T/R component and a correlation index between component state parameters of corresponding adjacent T/R components of the T/R component in a T/R array; based on the correlation index, a valid state parameter of the T/R component is determined. In one embodiment, calculating the correlation index between the component status parameter of the T/R component and the component status parameter of the corresponding adjacent T/R component of the T/R component in the T/R array specifically includes: calculating a statistical dispersion between component state parameters of the T/R component and component state parameters of corresponding adjacent T/R components of the T/R component in the T/R array; Based on the statistical d