Design And Implementation Of Real-time Physical Characteristics Inversion System For Radar Targets

With the development of radar technology and the growing complexity of radar’semploying environment, more and more attention has been paid to radar targetrecognition. The requirement for detection, warning, recognition and catalogue of spacetargets become more urgent.People have been accustomed to distinguish objects with visual judgment in atradition way, such as the size, shape and material of an object. If the target’s physicalinformation can be acquired from radar’s echo signal, such as its size, shape, material,scattering and polarization characteristics, as well as some physical feature involvedwith its electricity medium, based on these abstracted feature the discriminationprobability will be greatly improved. But so far, there is no such real time inverseprocessing equipment applied in our space range.To solve the problem above, the paper focuses on engineering realization ofphysical characteristics inversion for radar targets. Based on further analysis of radar’swide-band signal, the pre-processing method and polarization information processingmethod were studied. Detailed research was carried out on radar target’s HRRP andwide-band polarization scattering matrix, with which a inverse algorithm can be appliedto get radar target’s radial length, thickness, scattering ability, number of strongscattering points, symmetry and attitude variation. The real-time algorithm wascarefully chosen, optimized and realized according to the necessary. The overalltechnical and hardware design scheme were made and the application software wasgiven. Radar interface was re-designed and the installation and the joint with radar werecarefully done and tested. The calibration methods for target polarization scatteringmatrix, radial length, and scattering ability was set up, and the calibration program wasfinished.After the design work was finished, the data output rate, time consuming and echosignal sampling rate were tested. The correctness, robust and Fault-tolerant ability ofreal time application software was tested as well. The test result show: systemperformance index meet the requirement of the overall design; The software was robust and Fault-tolerant, which runs correctly; the computation output meet the precisionrequirement.A plenty of space targets have been processed with the recognition system since itscompletion. The practical application demonstrate that the acquired physical feature ofspace targets were distinct and could be used to identified targets in real-time.The design of the recognition system filled a gap for space range radar which hasno characteristic inverse processing abilities, it can also be used in a wide range.