{'fraction_non_alphanumeric': 0.01576182136602452, 'fraction_numerical': 0.0, 'mean_word_length': 5.531428571428571, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Terminal Constraint Guidance Law Design Based on Virtual Target Correction

According to the attitude requirements of directional warhead scattering in a narrow angle, a new terminal constraint guidance law based on virtual target is designed. Aiming to attain the optimal efficiency, terminal trajectory of the ammunition is corrected by virtual target to improve the accuracy of the kill element. Firstly, based on the established hit point model of kill element, the constraints of precise hitting considering burst height and impact angle are deduced. By introducing a predictive control method called ‘model prediction-receding horizon-feedback correction’, the initial selection and real-time correction of virtual target is designed definitely. Then the guidance law against virtual target is designed in the longitudinal plane and transverse plane respectively. In the end, numerical simulations and simulations by Monte Carlo are implementated with the background of loitering ammunition eqquiped with EFP warhead, which show that the guidance law proposed can reach the demanded attitude for the precise hitting of the kill element.