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To measure the muzzle velocity of field artillery weapons.
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The M90 Radar Chronograph provides muzzle velocity data to the Fire Direction Center (FDC), enabling the FDC to compute accurate fire control solutions. This data input is critical to FD computations. Each artillery battery has one M90. The M90 Radar Chronograph is a Doppler radar system that consists of a radio frequency antenna, transmitter-receiver, readout display, mounting brackets that are semi-permanently mounted to each artillery weapon, and the necessary cables. The antenna and transmitter-receiver are mounted on a nonrecoiling part of the howitzer and are connected to the display/control unit by a 30-meter cable. The radar chronograph is powered by an external source of 18 - 30 volts DC. The M90 is not able to measure muzzle velocities of rocket-assisted projectiles or basebleed projectiles.
