초록 ▼

A radio slant ranging system having a bank of range gates producing outputs XI to XN which comprise ground clutter components on a thermal noise pedestal. The clutter components are regarded as defining a single sinusoidal ripple envelope on the noise pedestal and a clutter centroid tracking signal

A radio slant ranging system having a bank of range gates producing outputs XI to XN which comprise ground clutter components on a thermal noise pedestal. The clutter components are regarded as defining a single sinusoidal ripple envelope on the noise pedestal and a clutter centroid tracking signal is derived by using a digital filter to calculate the real and imaginary components A1R and A1I of the transform: [Figure] and then forming the arctangent of A1I/-A1R. The signal processing method used in the system may have general application.

대표청구항 ▼

A method of radio ranging comprising the steps of: receiving a radar return signal; discriminating the radar return signal to form a plurality N of range channel signals X1 to XN representative of return signal components associated with respective ones of N consecutive range cells; and determining

A method of radio ranging comprising the steps of: receiving a radar return signal; discriminating the radar return signal to form a plurality N of range channel signals X1 to XN representative of return signal components associated with respective ones of N consecutive range cells; and determining the location of the centroid of a peak in the ripple envelope defined by the range channel signals by filtering those signals to form the real and imaginary components A1R and A1I, respectively, of the A1 transform of a discrete Fourier transform: [Figure] and then calculating a range error signal from the arctangent of A1I/-A1R.