Species Identification Of Target Insects By Entomological Radar

Radar is the most effective tool to monitor the trans-regional migration of insect pests,however,due to the fact that the simplex wave-band and polarization mode of traditional entomological radar,making it difficult to detect multi-scale insect species(with body length from millimeter to centimeter)and obtain their biological parameters.Without theses information,radar can not automatically determine the community structure of insects flying in the air,which is the bottleneck of the effectiveness in the current monitoring and forecasting system.This study was mainly to solve this problem,and on the basis of which the ecological trpping and green control method of migratory insect pests was explored.The main results were summarized as follows.1.There was no significant intra-specific difference of the selected 8 biological parameters of the tested insect speciment,however,the inter-species differences was significant.2.The discriminant ability of biological parameters in distinguishing insect species was evaluate by stepwise discriminant analysis:wing-beat frequency>body length>wing width>wing length>body mass>body width>the ratio of wing length to wing width>body length to wing width.3.The discrimination model of migratory insect species was founded by canonical discriminant function,and the discriminant accuracy reached to 89.72%for the testing 9786 insect specimens,which belonging to 4 orders and 9 families.4.The projection of three-dimensional scattering matrix of target insects in the two-dimensional plane could be obtained by full polarization(BH/HV/VH/VV)of tested radars.The three-dimensional posture of target insects flying in the air could be detected by holographic observation of multi-angle polarization.5.Through the RCS response curve of multi-band radar and the theory of polarization holographic scattering,and based on the rotational summetry medium ellipsoid analytic expression in Rayleigh's scatter region,the body length and body mass of tiny insects were sussfully detected.Based on the rotational summetry medium ellipsoid analytic expression in resonant scatter region,the body length and body mass of medium-sized and larger-sized insects were sussfully detected.6.Through the match feature between the amplitude of wingbeatand the wave-length of radar,the wingbeatfrequency of target insects could be detected by the principle of micro-doppler frequency,which based on the carrier phase.7.The validation results in the micro-wave dark romm showed that the relative error of body length measured by the above methods was 7.45±3.48%,the relative error of body mass measured by the above methods was 10.40±7.03%,and the relative error of wingbeat frequency measured by the above methods was 1.19±0.46%.8.Through the methods of behavioristics,the selectivity of insect species to different wave-length lights was founded.The best trapping wave-length of noctuidae insect pests were mainly concentrated at lights 4-8.The best trapping wave-length of lacewings was light 13.The best trapping wave-length of lady bugs were light 2-3.Overall,this study founded a discrimination model by 8 biological parameters of migratory insects firstly,and then the detecting ability to the above biological parameters by radar was verified by theorectical modeling,biological inversion and experimental validation.These results provide theoretical basis and technical support of the automatic species identification of migratory insects by radar.On the other hand,through the methods of behavioristics,the selectivity of insect species to different wave-length lights was founded.This will be helpful developing the new light traps,which can accurately capture crop pests,however,avoid to trap the natural enemies or non-target insects at the same time.