CN-121980809-A - Space non-uniform null depth control method for satellite anti-interference scene

CN121980809ACN 121980809 ACN121980809 ACN 121980809ACN-121980809-A

Abstract

The space non-uniform null depth control method for the satellite anti-interference scene solves the problems that the null depth is difficult to control, null shift and is too narrow caused by the fact that a traditional uniform array model cannot process phase nonlinearity, and belongs to the technical field of communication and radar signal processing. The method comprises the steps of obtaining non-periodic two-dimensional coordinates of each array element in a space non-uniform array, calculating an array guide vector, defining a main lobe angular domain by taking an expected signal direction as a center based on the guide vector, defining a region except the main lobe angular domain in a scanning range as a side lobe angular domain, performing intensive discrete sampling in an interference source direction to form a null angle domain, constructing an objective function by taking a complex weight vector of the array element as an optimization variable, introducing constraint conditions, determining an optimization problem, solving the optimization problem to obtain an optimal complex weight vector, and loading the optimal complex weight vector into array processing hardware.

Inventors

JIA MIN
SONG JINYUE
MENG SHIYAO
LU RONG
FAN GAOLE
LIU YIHUA
GAO RONG
CHEN WANQI

Assignees

哈尔滨工业大学

Dates

Publication Date: 20260505
Application Date: 20260205

Claims (10)

1. The method for controlling the space non-uniform null depth facing the satellite anti-interference scene is characterized by comprising the following steps of: Acquiring non-periodic two-dimensional coordinates of each array element in a space non-uniform array, and calculating an array guide vector based on the non-periodic two-dimensional coordinates; Defining a main lobe angular domain by taking a desired signal direction as a center based on the calculated array guide vector, defining a region except the main lobe angular domain in a scanning range as a side lobe angular domain, and performing intensive discrete sampling in an interference source direction to form a null angular domain; Constructing an objective function by taking a complex weight vector of an array element as an optimization variable, introducing constraint conditions, and determining an optimization problem, wherein the constraint conditions comprise main lobe gain constraint, side lobe suppression constraint, null depth constraint and amplitude constraint; and solving the optimization problem to obtain an optimal complex weight vector, and loading the optimal complex weight vector into the array processing hardware.
2. The method for controlling the depth of a space non-uniform null for a satellite-based anti-interference scene according to claim 1, wherein in a transmission service mode, taking the maximum response amplitude of a minimum sidelobe angular domain as an objective function, and the constraint conditions comprise a main lobe gain constraint, a null depth constraint and an amplitude constraint; The main lobe gain constraint is used for constraining the main lobe gain lower limit; The null depth constraint is used for constraining the array response amplitude of the null angle domain to be lower than a set null suppression threshold value; the amplitude constraint is used to limit the amplitude of the complex weights of the array elements in the array from exceeding the peak allowed by the physical hardware.
3. The method for controlling the depth of a space non-uniform null for a satellite-based anti-interference scenario of claim 2, wherein the optimization problem in the transmission traffic mode is: Wherein, the Maximum response amplitude of sidelobe angular domain; Is the lower limit of the main lobe gain; for the cosine space coordinates of the aperiodic two-dimensional coordinates of N array elements for a given observation direction, the array steering vector is generated at the angular domain limit Is flattened in one dimension to obtain cosine space coordinates 、 Values and ranges of (2); is the m-th guiding vector after one-dimensional flattening, , , , ; Representing coordinates of the center of the main lobe; Representing the side lobe angular domain, Is a null angle domain; a threshold value operator is suppressed for null in a transmitting service mode; complex weight vector , Is the complex weight of the nth array element.
4. The method for controlling the depth of a space non-uniform null for a satellite-based anti-interference scene according to claim 1, wherein in a receiving service mode, with a maximized target gain as an objective function, constraint conditions include a side lobe suppression constraint, a null depth constraint and an amplitude constraint; the null depth constraint is used for constraining the array response amplitude of the null angle domain to be lower than a set threshold value; The sidelobe suppression constraint is used for constraining the array response amplitude of the sidelobe angular domain to be lower than a sidelobe suppression index; the amplitude constraint is used to limit the amplitude of the complex weights of the array elements in the array from exceeding the peak allowed by the physical hardware.
5. The method for controlling the depth of a space non-uniform null for a satellite-based anti-interference scenario of claim 4, wherein the optimization problem in the reception service mode is: Wherein, the Is the target gain; for the cosine space coordinates of the aperiodic two-dimensional coordinates of N array elements for a given observation direction, the array steering vector is generated at the angular domain limit Is flattened in one dimension to obtain cosine space coordinates 、 Values and ranges of (2); is the m-th guiding vector after one-dimensional flattening, , , , ; Representing coordinates of the center of the main lobe; Representing the side lobe angular domain, Is a null angle domain; in order to obtain the side lobe suppression ratio, A threshold value operator is suppressed for receiving nulls in a service mode; complex weight vector , Is the complex weight of the nth array element.
6. The method for spatially non-uniform null depth control for satellite-based anti-interference scenarios according to claim 3 or 5, characterized in that the null angle field The method comprises the following steps: Wherein, the Is the radius of the null at the point, Is the coordinates of the null point.
7. The method for controlling the depth of a space non-uniform null for a satellite-based anti-interference scene according to claim 3 or 5, wherein the side lobe angular domain is: Wherein, the To the center of the main lobe Distance of (2) , Is a sidelobe range parameter.
8. A computer-readable storage device storing a computer program, wherein the computer program when executed by a processor implements the steps of the method for controlling the depth of a spatially non-uniform null for a satellite-based anti-interference scene according to any one of claims 1 to 7.
9. A satellite anti-interference scene-oriented spatial non-uniform null depth control device comprising a storage device, a processor and a computer program stored in the storage device and executable on the processor, wherein execution of the computer program by the processor effects the steps of the satellite anti-interference scene-oriented spatial non-uniform null depth control method according to any one of claims 1 to 7.
10. A computer program product comprising a computer program which, when executed by a processor, implements the steps of the method for controlling the depth of a spatially non-uniform null for a satellite-based anti-interference scene according to any one of claims 1 to 7.

Description

Space non-uniform null depth control method for satellite anti-interference scene Technical Field The application relates to a satellite anti-interference scene-oriented space non-uniform null depth control method, and belongs to the technical field of communication and radar signal processing. Background With the increasing complexity of electromagnetic environments, the anti-interference capability of array antennas has become a core competitiveness in wireless communication, radar and satellite navigation systems. The space non-uniform array (non-periodic array) breaks through the limitation of half-wavelength periodic arrangement of the traditional uniform array, and can obtain larger physical aperture under the same number of array elements by utilizing irregular array element position distribution, so that the angular resolution of the system is remarkably improved. In addition, the non-uniform layout can inhibit grating lobe effect through the position freedom degree, and provides wide optimization space for low side lobe design and fine spatial filtering. In practical engineering applications, null depth control of spatially non-uniform arrays is a very challenging task, with complexity far exceeding that of conventional uniform periodic arrays. First, the most notable feature of non-uniform arrays is their strong nonlinearity in phase. Since the array element spacing no longer follows the equidistant rule of half wavelength, the array vector exhibits a highly nonlinear mapping relationship with the change of the spatial angle. Such physical characteristics make the traditional beam pointing algorithm based on analytic solution or linear search perform poorly in non-periodic scenarios, and it is often difficult to form null suppression with accurate position and sufficient depth in the direction of the interference source. Second, the non-uniform layout, while breaking grating lobe limitations and increasing physical aperture through sparse arrangement, this large aperture characteristic also results in a very narrow beam double-bladed sword effect. The null areas formed under this layout are typically too narrow. In high dynamic environments such as satellite communication, when the position of an interference source is slightly shifted, physical position errors exist in array element installation, or frequency drift is generated in the system due to environmental change, the narrow nulls are extremely easy to shift, so that an interference signal is quickly separated from a suppression area, and the whole anti-interference system is caused to instantaneously suppress failure. In addition, from an algorithm robustness perspective, classical minimum variance distortion-free response (Minimum Variance Distortionless Response, MVDR) algorithms expose limitations in non-periodic scenarios. In particular, in environments where the distribution of the interference sources is highly complex, the covariance matrix of the non-uniform array is extremely prone to numerical morbidity, resulting in solution failure or spurious response. More importantly, the traditional statistical processing method cannot carry out quantitative fixed-point control on specific suppression decibel values of nulls, which is particularly insufficient in engineering tasks with strict requirements and accurate resource allocation. Finally, hardware implementation constraints are also an important issue in the null depth control engineering process. When the ideal weight output by the traditional optimization algorithm cannot be mapped accurately on hardware, signal distortion can be caused, the actually generated null depth can be greatly reduced, and large-scale application of the complex non-periodic layout in an actual radio frequency system is severely restricted. Disclosure of Invention Aiming at the problems that the null depth is difficult to control, null shift and is too narrow caused by the fact that the traditional uniform array model cannot handle phase nonlinearity, the application provides a spatial non-uniform null depth control method for a satellite anti-interference scene. The application discloses a space non-uniform null depth control method for a satellite anti-interference scene, which comprises the following steps: Acquiring non-periodic two-dimensional coordinates of each array element in a space non-uniform array, and calculating an array guide vector based on the non-periodic two-dimensional coordinates; Defining a main lobe angular domain by taking a desired signal direction as a center based on the calculated array guide vector, defining a region except the main lobe angular domain in a scanning range as a side lobe angular domain, and performing intensive discrete sampling in an interference source direction to form a null angular domain; Constructing an objective function by taking a complex weight vector of an array element as an optimization variable, introducing constraint conditions, and determining