Abstract: A system is provided that includes a Doppler radar unit that transmits a first electromagnetic wave having a first frequency, which a test system converts to a first electrical signal having the first frequency. The test system generates a second electrical signal having a second frequency, and mixes the first and second electrical signals to produce a third electrical signal having a third, sum or difference frequency. The third frequency represents a Doppler-shifted frequency caused by reflection of the first electromagnetic wave by a target at a distance from the Doppler radar unit. The test system converts the third electrical signal to a second electromagnetic wave having the third frequency, and transmits the second electromagnetic wave back to the Doppler radar unit for calculation of a speed representing that of the target as a function of the first and third frequencies, from which the Doppler radar unit may be calculated/certified.

Abstract: A system is provided that includes a Doppler radar unit that transmits a first electromagnetic wave having a first frequency, which a test system converts to a first electrical signal having the first frequency. The test system generates a second electrical signal having a second frequency, and mixes the first and second electrical signals to produce a third electrical signal having a third, sum or difference frequency. The third frequency represents a Doppler-shifted frequency caused by reflection of the first electromagnetic wave by a target at a distance from the Doppler radar unit. The test system converts the third electrical signal to a second electromagnetic wave having the third frequency, and transmits the second electromagnetic wave back to the Doppler radar unit for calculation of a speed representing that of the target as a function of the first and third frequencies, from which the Doppler radar unit may be calculated/certified.

Abstract: A kite with a crossed-stick frame has a bracket secured to the sticks and which supports the kite skin in an aerodynamic configuration. The bracket has a folded body that wraps around one frame stick and seats another in holes on either side of the fold. Webs on the bracket span from this engagement with the frame to deflect the kite skin away from the frame into a desired aerodynamic configuration.