Methods of identification and restoration of information content of anomalous micronavigation measurements of signals with superposition of reflections from the ground in quasi-continuous radiation radars

For typical aviation radars with quasi-continuous radiation in the problems of measuring/estimating (micro)navigation parameters of the radar phase center, methods are presented for identifying anomalous frequency-time measurements/estimates of the phase center velocity and restoring the uniqueness of the identified anomalous measurements caused by the superposition of reflections from areas of the earth's surface located from the phase center at distances multiple of the pulse repetition period. Taken together, these methods, based on the procedures of primary intra-period processing of the received signal, provide for an expansion of its information content, an increase in noise immunity and the potential accuracy of speed estimates based on the generated information redundancy of simultaneous unambiguous speed measurements and their joint processing. The methods presented are based on the criteria: compliance of the calculated and measured relations of Doppler frequencies or squares of Doppler frequencies for the identification of “abnormal” frequency-temporal measurements and determining the totality of “nominal” measurements for assessing the speed of the antenna phase center; compliance of the calculated and determined based on frequency-time measurements of the distance between the strips of the earth's surface, according to the reflection from which in different samples of the range of the working zone of the period of repetition of the pulses after the fast transformation procedure, the amplitude maximums of the signal are formed. Analysis of the “miserable” of these distances for all combinations of measured Doppler frequencies also ensures the identification of abnormal measurements, the identification of the values among them due to superposition of reflections from the lanes of the earth's surface with “multiple” tilted ranges and the determination of these ranges, which actually restores the unambiguity of such measurements and their information In the aspect of determining the speed of the phase center of the antenna. The performance and effectiveness of the proposed methods is demonstrated by the example of processing typical “real” signals from the ground in the quasi-continuous radiation mode obtained in field experiments.