  Radiolocation methods of probing minor celestial bodies (asteroids) by the
nanosecond pulses can be used for monitoring of near-Earth space with the
purpose of identification of hazardous cosmic objects able to impact the Earth.
Development of the methods that allow to improve accuracy of determining the
asteroids size (i.e. whether it measures tens or hundreds meters in diameter)
is important for correctly estimating the degree of damage which they can cause
(either regional or global catastrophes, respectively). In this paper we
suggest a novel method of estimating the sizes of the passive cosmic objects
using the radiolocation probing by ultra-high-resolution nanosecond signals to
obtain radar signatures. The modulation envelope of the reflected signal, which
is a radar portrait of the cosmic object, is subjected to time scale
transformation to carrier Doppler frequency by means of radioimpulse strobing.
The shift of a strobe within the probing period will be performed by radial
motion of the object which will allow to forgo the special autoshift circuit
used in the oscillographic technical equipment. The measured values of duration
of radiolocation portrait can be used to estimate the mean radius of the object
by using the average spatial length of the portrait. The method makes it
possible to appraise the sizes of cosmic objects through their radiolocation
portrait duration, with accuracy that is independent of the objects range.
