Abstract: A novel approach for establishing clear regions in multi-pulse repetition frequency (PRF) pulse Doppler radar is proposed. The clear regions are constructed using the sigmoid function, ...

"The Federalist" editor-in-chief Mollie Hemingway reacts to how Democrats are handling President Donald Trump's efforts to stem crime in large cities. BRET BAIER, ANCHOR: Mollie? MOLLIE HEMINGWAY, ...

These high-speed pieces of debris create a major threat to active satellites and spacecraft. With each new mission launched, the risk of collision increases, making space debris one of the biggest ...