CN-122017735-A - Robust multi-intermittent radiation source direct positioning method without information source number estimation

CN122017735ACN 122017735 ACN122017735 ACN 122017735ACN-122017735-A

Abstract

The invention discloses a robust multi-intermittent radiation source direct positioning method without information source number estimation, which comprises the steps of firstly constructing a receiving signal model of an observation station under a plurality of intermittent radiation source scenes, secondly constructing a multi-radiation source direct positioning spatial spectrum by utilizing space-time correlation matrixes of receiving signals at different lag moments on the basis of the receiving signal model, finally constructing an initial direct positioning spatial spectrum by utilizing the radiation time slot number, sorting the radiation source state by taking the spatial position of the radiation source as a correlation basis, realizing the judgment of the radiation source type by binary clustering of spectrum values under all observation time slots, and estimating the radiation source position after changing the radiation time slot number in the initial direct positioning spatial spectrum according to a clustering result for intermittent radiation sources, and estimating the radiation source position by utilizing the multi-radiation source direct positioning spatial spectrum for non-intermittent radiation sources so as to obtain a high-precision and super-resolution positioning result.

Inventors

WANG LING
Zou Ruijing
XIE JIAN
TAO MINGLIANG
SUN YANDONG
ZHANG ZHAOLIN
GONG YANYUN

Assignees

西北工业大学

Dates

Publication Date: 20260512
Application Date: 20260119

Claims (10)

1. A robust multi-intermittent radiation source direct positioning method without source number estimation, comprising: Firstly, constructing a receiving signal model of an observation station under a plurality of intermittent radiation source scenes, secondly, constructing a multi-radiation source direct positioning spatial spectrum by utilizing a space-time correlation matrix of receiving signals at different lag moments on the basis of the receiving signal model, finally, constructing an initial direct positioning spatial spectrum by utilizing the number of radiation time slots, sorting the states of the radiation sources by taking the spatial positions of the radiation sources as correlation basis, realizing the judgment of the radiation source types by binary clustering of spectrum values under all observation time slots, carrying out the estimation of the radiation source positions after the number of the radiation time slots in the initial direct positioning spatial spectrum according to clustering results for the intermittent radiation sources, and carrying out the estimation of the radiation source positions by utilizing the multi-radiation source direct positioning spatial spectrum for non-intermittent radiation sources.
2. The method for direct positioning of multiple intermittent radiation sources without source number estimation according to claim 1, wherein the method comprises a moving observation station and multiple fixed radiation sources, the observation station performing multiple array snapshot sampling in each observation time slot; the received signal model is characterized by an array steering vector, a radiation state of a radiation source, a radiation signal, and noise.
3. The method for robust multi-intermittent radiation source direct localization without source number estimation of claim 1, wherein the received signal is defined according to a received signal model At a lag of Time space-time correlation matrix is Assuming that the noise is zero-mean complex gaussian white noise, there is: ; Wherein, the For an array manifold matrix, since the individual radiation sources are uncorrelated, the space-time correlation matrix of the radiation sources is written as: ; Wherein, the Is the first The time delay of each radiation source The following autocorrelation function, construction Different delays Will not be delayed simultaneously Substitution into Obtaining the time-space correlation matrix of the time delay ; Having a joint diagonalization structure and being associated with an array manifold matrix To be spread into the same space, then use this The joint diagonalization structure of each space-time correlation matrix can determine the array manifold matrix And performs a position estimation of the radiation source.
4. The method for robust multi-intermittent radiation source direct localization without source number estimation of claim 1, wherein for the first A plurality of radiation sources, always having a vector And in addition to the first Within the observation time slot Array steering vector for individual radiation sources In addition to The values spanned by the array steering vectors are spatially orthogonal, and therefore: ; Wherein, the Represent the first The position of the individual radiation sources is determined, Then: ; In the formula, Is a scalar quantity, if the variables are described above Is the true source position There is always a scalar So that And Is collinear, namely: ; for all time delays All are true, and the different observation time slots are independent, so that the positioning problem can be converted into the following optimization problem: Wherein the variables are Is the position of the radiation source to be estimated, As a variable Corresponding array steering vectors, wherein Is composed of vectors The vector formed by the meters is calculated, Is formed by scalar quantity A vector of the components; 、 Is that And Is a set of (3).
5. The method for robust multi-intermittent radiation source direct localization without source number estimation of claim 1 wherein said optimization problem is solved and the equation constraint and objective function are combined into a Lagrangian function by Lagrangian multiplier method by vector pair Solving to simplify the optimization problem, and finally constructing a multi-radiation source direct positioning spatial spectrum as follows: ; Wherein, the , Parameter superscript 、 Respectively represent conjugate transposition and pseudo inversion, Representing the maximum eigenvalue of the matrix.
6. The robust multi-intermittent radiation source direct-localization method without source number estimation of claim 1, wherein an initial direct-localization spatial spectrum is constructed as follows: ; Wherein, the A number of radiation slots for an initial radiation source; Wherein, the Indicating a descending order of arrangement and, Representation of The descending order is arranged before taking Item 1 Term, location spectrum function Expressed as: Is that Setting an initial value, meshing the region of interest, and calculating the initial direct positioning spatial spectrum of each grid position point And then carrying out detection estimation on the initial positioning space spectrum by using a CFAR detection criterion to obtain the quantity of the radiation sources and the initial position information of each radiation source in the scene.
7. The method for robust multi-intermittent radiation source direct localization without source number estimation of claim 1, wherein for the first The initial position information of each radiation source is obtained by the K-means clustering method Where (a) Individual position spectrum values Two categories are grouped, wherein a larger value corresponds to a radiation reception slot and a smaller value corresponds to an idle reception slot: Wherein, the And The center values of the radiated reception slots and the idle reception slots, And Based on the distance between the cluster centers, identifying non-intermittent radiation sources according to the following discrimination conditions: Wherein, the The current radiation source is an intermittent radiation source if the discrimination condition is satisfied, otherwise, the current radiation source is a continuous radiation source.
8. The method of claim 7, wherein when the radiation source type is determined to be intermittent, non-radiation time slots are prevented from entering the positioning space spectrum calculation, and the number of radiation time slots in the initial direct positioning space spectrum is updated to be And when the radiation source type is judged to be a non-intermittent radiation source, directly utilizing the multi-radiation source direct positioning space spectrum to carry out radiation source position estimation.
9. A terminal device comprising a processor, a memory and a computer program stored in said memory, characterized in that the processor, when executing the computer program, implements a robust multi-intermittent radiation source direct localization method without source number estimation according to any of claims 1-8.
10. A computer readable storage medium, in which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the robust multi-intermittent radiation source direct localization method without source number estimation according to any of claims 1-8.

Description

Robust multi-intermittent radiation source direct positioning method without information source number estimation Technical Field The invention relates to the technical field of passive positioning, in particular to a robust multi-intermittent radiation source direct positioning method without information source number estimation, which can be used for directly positioning a ground radiation source by a satellite. Background In a practical scenario, the number of radiation sources per observation time slot is inconsistent, because of the spatial scanning, frequency agility, time division multiple access, etc. modes of operation of the complex radiation sources, which result in a reconnaissance system that can only achieve intermittent reception. Common intermittent radiation sources such as fire control intermittent radiation radar and terminals and base stations that employ time division multiple access (Time Division Multiple Access, TDMA) communications. In order to resist the attack of the anti-radiation radar, the fire control radar reduces the discovery probability of the anti-radiation missile through intermittent radiation, and improves the survivability of the fire control radar. For a terminal and a base station which communicate in a TDMA mode, since the terminal and the base station divide time into a plurality of time slots in one communication frame, each time slot is allocated to a specific base station for radiation, and intermittent radiation characteristics are also shown at a reconnaissance receiving end. Meanwhile, a large number of mechanically scanned radar radiation sources exist in an actual scene, and the radiation sources realize active detection of targets in a 360-degree search area through periodic motion of a transmitting antenna, and most of the radiation sources have the characteristics of high signal-to-noise ratio of a main lobe, narrow wave beam, stable scanning period and the like. When the mechanical scanning radar radiation source is positioned, due to the narrow beam characteristic of the main lobe signal, the coverage area of the main lobe signal is limited, so that the signal of the radiation source is intercepted at the time of reconnaissance sometimes or intermittent radiation characteristic is also presented at the receiving end. The most intensive research of the current intermittent radiation source direct positioning method is Oispuu et al, firstly, the problem of target positioning of the intermittent radiation source is put forward, the CDPD (Capon DPD) direct positioning method is put forward, the positions of all targets are estimated by multi-dimensional searching, the searching dimension is reduced by using alternate projection (Alternation Projection, AP) when the targets are positioned, and the calculation complexity of the multi-target direct positioning is reduced by an AP algorithm. Hao et al, on this basis, propose intermittent radiation source positioning based on improved MVDR, positioning is achieved by alternately estimating the radiation time slots and the radiation source positions, and has higher positioning accuracy than the AP algorithm, however, the method has poor positioning effect on adjacent radiation sources. The existing direct positioning method is mostly suitable for continuous radiation source targets, and has the problem of weak signal flooding for intermittent radiation sources. Therefore, how to further improve the positioning accuracy and the positioning resolution and realize the positioning of the adjacent intermittent radiation source is a technical problem to be solved in the field. Disclosure of Invention The invention aims to provide a robust multi-intermittent radiation source direct positioning method without estimating the number of information sources, which further improves the positioning precision and the positioning resolution of adjacent intermittent radiation sources. In order to realize the tasks, the invention adopts the following technical scheme: a robust multi-intermittent radiation source direct localization method without source number estimation, comprising: Firstly, constructing a receiving signal model of an observation station under a plurality of intermittent radiation source scenes, secondly, constructing a multi-radiation source direct positioning spatial spectrum by utilizing a space-time correlation matrix of receiving signals at different lag moments on the basis of the receiving signal model, finally, constructing an initial direct positioning spatial spectrum by utilizing the number of radiation time slots, sorting the states of the radiation sources by taking the spatial positions of the radiation sources as correlation basis, realizing the judgment of the radiation source types by binary clustering of spectrum values under all observation time slots, carrying out the estimation of the radiation source positions after the number of the radiation time slots in the initial direct positioning s