Patent ID: 8169360
Filing Date: 2012-05-01
Classification: G01S

Abstract:
1. A radar system comprising: an electronic transmitter associated with a vehicle and adapted to emit a non-linear swept electromagnetic FM signal, said non-linear swept electromagnetic FM signal having a waveform mathematically described by a second-order-polynomial; an apparent emitted signal electronic sensor associated with an object whose range and closing velocity to a target will be estimated, said apparent emitted signal electronic sensor adapted to receive a semi-active mode apparent emitted signal, said semi-active mode apparent emitted signal corresponding to said non-linear swept electromagnetic signal emitted from said electronic transmitter; a reflected signal electronic sensor associated with said object and adapted to receive a reflected signal, said reflected signal corresponding to said non-linear swept electromagnetic signal having been reflected from said target; at least one electronic waveform processor operatively associated with said apparent emitted signal electronic sensor and said reflected signal electronic sensor and configured and programmed to generate an estimate of the range from said object to said target and an estimate of said closing velocity of said object to said target by processing said semi-active mode apparent emitted signal and said reflected signal; and a plurality of computer readable instruction modules executably associated with said at least one electronic waveform processor; said plurality of computer readable instruction modules including: at least one Doppler Adjust module; when run by said electronic waveform processor, said Doppler Adjust module causing said at least one electronic waveform processor to generate an Adjusted Doppler function for at least one sweep; said Adjusted Doppler function representing apparent Doppler shift derived using a non-varying range value; and at least one Linear Regression module; when run, said Linear Regression module causing said at least one electronic waveform processor to perform linear regression on said Adjusted Doppler function to produce a best-fit Linearly Regressed function, the slope of said Linearly Regressed function representing a first estimate of the range of said object to said target; the y-intercept of said Linearly Regressed function, when divided by krng, representing a first estimate of closing velocity of said object to said target; the variance of said best-fit Linearly Regressed function representing Doppler variance.