초록 ▼

A radar system transmits a signal to a target wherein the frequency is modulated with a sinusoidal modulation pattern. The difference between the actual target range and an estimate thereof is subjected to a spectral analysis wherein the spectral terms are described by Bessel functions. A second ord

A radar system transmits a signal to a target wherein the frequency is modulated with a sinusoidal modulation pattern. The difference between the actual target range and an estimate thereof is subjected to a spectral analysis wherein the spectral terms are described by Bessel functions. A second order range tracking loop, responsive to the relative magnitudes of the spectral terms, and an estimator of target radial acceleration, responsive to successive values of the spectral terms, provide components of the range estimate.

대표청구항 ▼

An echo measurement system comprising: means for transmitting a signal to a target, said transmitting means providing a replica of said signal, said signal including a modulation of a frequency thereof with a periodic modulation pattern; means for receiving said signal as reflected from said target,

An echo measurement system comprising: means for transmitting a signal to a target, said transmitting means providing a replica of said signal, said signal including a modulation of a frequency thereof with a periodic modulation pattern; means for receiving said signal as reflected from said target, said receiving means including means for modifying said replica to compensate for the effects of target movement on the frequency spectrum of said signal; and wherein said modifying means includes means for multiplying said replica by said signal, analyzer means for providing a set of spectral lines of a product of said multiplying means, and means responsive to the differences among spectral lines of said product for modifying said replica with a compensating signal to null the effects of said target movement, said compensating signal having range data therein.