초록 ▼

An estimate of the time of the boost engine cut-off of a missile is provided by irradiating the missile after it is launched with continuous wave signals. The reflected continuous wave signals are detected and an inflection in the Doppler measurements of the reflected continuous wave signals provide

An estimate of the time of the boost engine cut-off of a missile is provided by irradiating the missile after it is launched with continuous wave signals. The reflected continuous wave signals are detected and an inflection in the Doppler measurements of the reflected continuous wave signals provide an initial estimate of the boost engine cut-off time. A Kalman filter is used to provide initial estimates of the position and velocity of the missile at the boost engine cut-off time and a square root information filter responding to the Doppler measurement residuals after boost engine cut-off reduces the error in the initial estimate of the boost engine cut-off time to a minimum.

대표청구항 ▼

[ We claim:] [1.] A method of determining the time of boost engine cutoff of a missile comprising illuminating said missile with radar signals as it travels through its trajectory from its launch point through its boost engine cutoff position, said trajectory including a trajectory portion extending

[ We claim:] [1.] A method of determining the time of boost engine cutoff of a missile comprising illuminating said missile with radar signals as it travels through its trajectory from its launch point through its boost engine cutoff position, said trajectory including a trajectory portion extending beyond said boost engine cutoff position, receiving Doppler shifted signals reflected from said missile as said missile travels through said trajectory, detecting an inflection in Doppler measurements of the received signals and using the time of said inflection as an initial estimate of the time of said boost engine cutoff, and reducing the error in said initial estimate of the time of said boost engine cutoff to a minimum by differential correction in response to Doppler measurements of the received signals reflected from said missile as it travels through said portion of said trajectory extending beyond said boost engine cutoff position.