Signal processing for ZLC-configuration insect-monitoring radars: Yields and sample biases

摘要: A radar design that has proved effective for monitoring insect migratory flights employs a vertical beam in which rotating linear polarization is combined with very narrow-angle conical scan - the “ZLC configuration”. The rather complicated echo-intensity time series produced when an individual traverses radar's contains information about insect's size, shape, orientation, and trajectory. However, retrieval of various parameters not always successful some types targets target are more vulnerable to processing failure than others. Variations ability profiling detect different sizes at heights understood can be corrected if speeds known (as case fully analyzed ZLC echo), but differences success rates represent additional source bias. This preliminary study identifies height, peak signal intensity, numbers as factors affecting yield, presents examples illustrate how they act. These three quantities available all detected targets, required use any scheme taking account losses generating profiles density (and other measures activity value entomologists).