Application of stochastic probing radio signals for the range-velocity ambiguity resolution in Doppler weather radars

Methods of expanding unambiguous measurement band of the range and radial velocity have been discussed on the basis of the uncertainty relation. The uncertainty function was derived, and properties of a sequence of stochastic radio pulses were analyzed. The use of the sequence of stochastic radio pulses for probing was shown to allow the problem of unambiguous measurement of the range and the estimation of the first three moments of Doppler spectrum of extended targets to be solved under conditions of the presence of “dead areas”

Detection of radar signals in conditions of full prior information when using stochastic signals for probing

Probabilistic characteristics of coherent detection of reflected signals with the fully known parameters when using stochastic soundings radio signals are determined. Analytical expression for probability density of decision statistics for the cases of presence at detector’s input of reflected signal only, interference only, and both signal and interference is obtained. Dependency of false alarm probability on threshold ratio and dependency of hit probability on signal-to-interference ratio for different values of bandwidth-duration product of stochastic signal are computed. A family of radar detection performances characteristics for fixed bandwidth-duration product and different values of false alarm probability is calculated

SAR imaging based upon nonswitchable antenna array and noise signals

The work is devoted to elaborating a new method for SAR image generating using noise/random signals and nonmoving & non-switching antenna array suggested in Lukin (2006). The main idea of that antenna array consists in the extraction from the total signal of one channel receiver the signals received by a single element of the array. This signals separation is based upon decorrelation properties of noise/random signals. Attractive advantages of the suggested antenna array and the method for SAR imaging consist in no need in either mechanical motion or electronic switching of the antenna array elements, which simplify its design and lower the cost. Analytical evaluations for main performance of such antenna array are given for its various implementations. The related SAR imaging algorithm is described in detail. Some results of computer modeling of SAR imaging using this antenna array are presented. Advantages and constraints of the method and array suggested are discussed