CN114442052A - Radar target simulation method based on external field collected data - Google Patents

Abstract

The invention discloses a radar target simulation method based on data acquired by an external field, which is a method for establishing a real target echo database based on data acquired by an external field test and accumulated samples, and designs an application program which is dynamically recombined, flexibly configured and generates a multi-target scene according to test requirements on the basis of the established echo database, thereby improving the fidelity and the practical degree of the constructed echo scene. These data are used to reproduce a simulation of the outfield environment, the trueness of which is more reliable and reliable than the results obtained by theoretical calculations.

Description

Radar target simulation method based on external field collected data

Technical Field

The invention relates to a radar target simulation method, in particular to a method for establishing a real target echo database according to data and accumulated samples acquired by an external field test.

Background

The complex battlefield environment formed by multiple systems, multiple platforms, multiple weapons, severe geography and natural environment such as reconnaissance, interference and interception forms great examination and challenge on the performance of the guidance radar. How to quickly verify and evaluate the performance of the radar and draw the requirements for constructing and realizing the complex battlefield environment. Meanwhile, how to exert the value of a large amount of outfield data accumulated for many years is a problem worthy of research.

The seeker plays a crucial role in the hit precision of the missile according to the detection, sorting and anti-interference performance of signals, so that the authenticity of the construction of a battlefield environment and the flexibility of dynamic recombination are crucial to the judgment of whether the performance of the seeker can meet the requirement of actual combat or not. At present, complex signal detection and sorting capability and anti-interference performance of a seeker are evaluated, a systematic, scientific and real model and means are lacked, and judgment accuracy is difficult to guarantee.

Disclosure of Invention

The invention provides a radar target simulation method based on outfield collected data, which is used for establishing a real target echo database according to data collected by an outfield test and accumulated samples.

The invention relates to a radar target simulation method based on outfield collected data, which comprises the following steps:

constructing a target characteristic library, including target data acquisition and marking, data normalization and target characteristic library construction;

and a scene reconstruction step, which comprises calling a target characteristic model according to the set parameters and generating real-time signal modulation based on the transmitting signals.

Further, the target characteristic library construction step specifically includes:

firstly, performing binary analysis, pulse compression and coherent accumulation preprocessing on an acquired radar original echo data file to form a standardized output file, and performing analysis and standardized naming on radar parameters related to labeling in the data preprocessing, wherein the process is to realize signal processing on an original echo and obtain data with the label;

secondly, separating a target from a background on the basis of data preprocessing, stripping target characteristics from a transmitted waveform, eliminating the difference of distance direction precision and broadening caused by different code patterns and pulse pressure window functions, and researching and analyzing a characterization model for constructing characteristics of coupling of the target and the environment from the analysis of actually measured data of different targets and environments;

and finally, the normalization processing of the target distance on the echo amplitude is completed, wherein the normalization processing comprises energy normalization and Doppler normalization, and the scattering values of all scattering points of the target and the background clutter echoes with the same reference distance are output after the normalization at the stage.

Further, the scene reconstruction step specifically includes:

firstly, according to the setting of each target parameter in a scene, parameter conversion is carried out, and the calculation of beam pointing error, incidence complementary angle, relative broadside angle and radial speed is completed in the parameter conversion; obtaining each target based on the observation visual angle of the seeker and the position and state information of interference through geometric space conversion, searching and calling characteristic data in a target characteristic library according to the calculated target parameters, and generating a system transfer function; and finally, receiving the radar emission waveform in real time, modulating the signal according to the test requirement, and obtaining the radio frequency excitation signal required by the test.

On the basis of experimental verification, a radar target simulation technical method is provided on the basis of researching and analyzing the influence degree of each factor on the performance of the seeker, on one hand, a relatively real echo signal is provided for the function and performance test of the inner field radar seeker, the method is used for evaluating the rationality of indexes, target sorting identification and interference countermeasure algorithm of the radar seeker, the development period of a product is shortened, and the development cost is reduced; on the other hand, target echo data under different scenes can be generated through simulation through the established target characteristic model base, wider scene data can be inverted, and data support is provided for artificial intelligent model training and algorithm development.

Drawings

FIG. 1 is a working schematic diagram of a radar target echo signal generation based on a target signal of measured data;

fig. 2 is a working principle block diagram of a radar-dedicated signal source device.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The method comprises the steps of obtaining models with practical values through playback, analysis, feature extraction and mathematical processing of outfield data, generating scene data files by using the models, playing the scene data files through a Data Acquisition (DA) system, and up-converting signals to a working frequency band of a radar seeker to serve as an excitation for testing the functional performance of the radar seeker, and is an effective way for solving the problem of complex environment construction.

The technical scheme is as follows: firstly, taking measured data as a basis, and carrying out system marking on radar equipment attributes, target attributes, data attributes and environment attributes on the typical target data of an external field test; stripping the target characteristics from the original echo and the specific waveform of the original radar, and further constructing a characteristic characterization model of the target in a full posture from the actual measurement data; and further constructing a characteristic cross-coupling characterization model of coupling between the target and the environment from the analysis of the measured data of different targets and environments, and extracting a target characteristic model. Secondly, along with the continuous accumulation of the measured data, the accumulation of databases of various scenes is gradually enriched and perfected, the data corresponding to the target model and the background noise data are generated according to the marked target characteristic database data corresponding to the selected required scene, and the signal modulation of the emission code pattern, the distance and the speed is carried out at the baseband intermediate frequency, so that the scene is reproduced by utilizing the target database model. And finally, carrying out analog conversion and up-conversion on the generated scene data to obtain a radio frequency signal so as to form test excitation of the radar seeker.

As shown in fig. 1, the method for generating a radar target signal based on measured data mainly includes two parts, namely, a construction of a target characteristic library and a scene reconstruction.

The target property library construction is a basic work. Firstly, preprocessing acquired radar original echo data files through binary analysis, pulse compression, coherent accumulation and the like to form standardized output files, and analyzing and standardizing and naming radar parameters related to labels in the data preprocessing, wherein the preprocessing is a process of processing signals of original echoes and acquiring data with labels; secondly, separating a target from a background on the basis of data preprocessing, stripping target characteristics from a transmitted waveform, eliminating the difference of distance direction precision and broadening caused by different code patterns, pulse pressure window functions and the like, and researching and analyzing a characterization model for constructing characteristics of coupling between the target and the environment from the analysis of actually measured data of different targets and environments; and finally, the normalization processing of the target distance on the echo amplitude is completed, wherein the normalization processing comprises energy normalization and Doppler normalization, and the scattering values of all scattering points of the target and the background clutter echoes with the same reference distance are output after the normalization at the stage.

In the process of scene reconstruction, firstly, parameter conversion is carried out according to the setting of each target parameter in a scene, and the calculation of beam pointing error, incidence complementary angle, relative bulwark angle and radial speed is mainly completed in the parameter conversion; obtaining each target based on the observation visual angle of the seeker and the position and state information of interference through geometric space conversion, searching and calling characteristic data in a target characteristic library according to the calculated target parameters, and generating a system transfer function; and finally, receiving the radar emission waveform in real time, modulating the signal according to the test requirement, and obtaining the radio frequency excitation signal required by the test.

The method for radar target signal based on measured data is applied to engineering practice, namely, the method is embedded into special radar signal source equipment which is used for providing radio frequency excitation for radar test at present, and powerful support can be provided for performance function test and simulation of the radar. The radar special signal source equipment is shown as the attached figure 2, and the specific implementation method comprises the following steps: carrying out convolution on a system transfer function generated by the computing array and a real-time received zero intermediate frequency radar transmitting signal to obtain a scene target echo baseband signal; interpolation and digital quadrature modulation are carried out on the convolved baseband target echo to complete signal up-conversion modulation, and the sampling rate of the modulated signal is higher, so that the digital up-conversion processing is realized by using a parallel structure of multi-phase filtering, and the required modulated output data can be obtained after parallel-serial conversion is carried out on the parallel calculation result; the scene target echo data processed by digital up-conversion modulation can obtain an intermediate frequency scene target echo after DA conversion, and finally the radio frequency signal generation of the scene target echo signal can be completed after the up-conversion of the radio frequency unit.

The method has the greatest advantages that accumulated and continuously abundant massive external field test data are effectively utilized, practical models are obtained through data playback, analysis, feature extraction and mathematical processing, scenes are reproduced by the models, the method is an effective way for solving complex environment construction, and reliable basis is provided for rapid verification and radar performance evaluation.

The above embodiments are only for explaining and explaining the technical solution of the present invention, but should not be construed as limiting the scope of the claims. It should be clear to those skilled in the art that any simple modification or replacement based on the technical solution of the present invention may be adopted to obtain a new technical solution, which falls within the scope of the present invention.

Claims (3)

1. A radar target simulation method based on external field collected data is characterized by comprising the following steps:

constructing a target characteristic library, including target data acquisition and marking, data normalization and target characteristic library construction;

and a scene reconstruction step, which comprises calling a target characteristic model according to the set parameters and generating real-time signal modulation based on the transmitting signals.

2. The radar target simulation method based on the outfield collected data as claimed in claim 1, wherein the target characteristic library construction step specifically comprises:

firstly, performing binary analysis, pulse compression and coherent accumulation preprocessing on an acquired radar original echo data file to form a standardized output file, and performing analysis and standardized naming on radar parameters related to labeling in the data preprocessing, wherein the process is to realize signal processing on an original echo and obtain data with the label;

secondly, separating a target from a background on the basis of data preprocessing, stripping target characteristics from a transmitted waveform, eliminating the difference of distance direction precision and broadening caused by different code patterns and pulse pressure window functions, and researching and analyzing a characterization model for constructing characteristics of coupling between the target and the environment from the analysis of actually measured data of different targets and environments;

and finally, the normalization processing of the target distance on the echo amplitude is completed, wherein the normalization processing comprises energy normalization and Doppler normalization, and the scattering values of all scattering points of the target and the background clutter echoes with the same reference distance are output after the normalization at the stage.

3. The radar target simulation method based on the external field acquired data according to claim 1 or 2, wherein the scene reconstruction step specifically comprises:

firstly, according to the setting of each target parameter in a scene, parameter conversion is carried out, and the calculation of beam pointing error, incidence complementary angle, relative broadside angle and radial speed is completed in the parameter conversion; obtaining each target based on the observation visual angle of the seeker and the position and state information of interference through geometric space conversion, searching and calling characteristic data in a target characteristic library according to the calculated target parameters, and generating a system transfer function; and finally, receiving the radar emission waveform in real time, modulating the signal according to the test requirement, and obtaining the radio frequency excitation signal required by the test.

Images