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Radiolocation methods of probing minor celestial bodies (asteroids) by thenanosecond pulses can be used for monitoring of near-Earth space with thepurpose of identification of hazardous cosmic objects able to impact the Earth.Development of the methods that allow to improve accuracy of determining theasteroids 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 wesuggest a novel method of estimating the sizes of the passive cosmic objectsusing the radiolocation probing by ultra-high-resolution nanosecond signals toobtain radar signatures. The modulation envelope of the reflected signal, whichis a radar portrait of the cosmic object, is subjected to time scaletransformation to carrier Doppler frequency by means of radioimpulse strobing.The shift of a strobe within the probing period will be performed by radialmotion of the object which will allow to forgo the special autoshift circuitused in the oscillographic technical equipment. The measured values of durationof radiolocation portrait can be used to estimate the mean radius of the objectby using the average spatial length of the portrait. The method makes itpossible to appraise the sizes of cosmic objects through their radiolocationportrait duration, with accuracy that is independent of the objects range.

Estimate of sizes of small asteroids (cosmic bodies) by the method of stroboscopic radiolocation