Dual pulse-repetition frequency ambiguity solving method for space-based radars

Abstract

The invention provides a dual pulse-repetition frequency ambiguity solving method for space-based radars. The method has the advantages that a speed ambiguity solving process is separated from a distance ambiguity solving process by introducing a dual carrier frequency design for each pulse-repetition frequency, the speed ambiguity is firstly solved by utilizing two different carrier frequencies of a same pulse-repetition frequency and the distance ambiguity is considered to be solved on an one-dimensional distance by utilizing a dual pulse-repetition frequency, so that on the one hand, the pairing problem and the ghost problem existing during the two-dimensional ambiguity solving of an overlap algorithm are alleviated, and on the other hand, the space filling time of the space-based radars is reduced by a large margin and the robustness of the target ambiguity solving is improved.

Description

technical field [0001] The invention relates to a space-based radar dual-frequency defuzzification method, which can be applied to space-based early warning radar distance and velocity defuzzification, and belongs to the field of radar technology. Background technique [0002] According to literature research, there is no space-based early warning radar operating in orbit at home and abroad. Existing research mainly focuses on orbit design, clutter suppression, and target detection. . [0003] For existing ground-based and airborne early warning radars, in order to ensure a higher target Doppler visible area, high repetition frequency design and medium repetition frequency design are generally adopted. The advantage of high repetition rate radar is that there is no target velocity ambiguity, and the duty cycle is high. It is widely used in tracking radar. The mid-repeat frequency design comprehensively considers the problems of range ambiguity and velocity ambiguity, and c...

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Problems solved by technology

[0005] First of all, the target distance position obtained by distance defuzzification cannot have two or more targets at the same time, otherwise they cannot be paired

[0006] Secondly, in a multi-target environment, the target fuzzy distances / velocities corresponding to multiple repetition frequencies may overlap, resulting in the generation of ghost images, and the number of ghost images increases sharply with the increase of the number of repetition frequencies and the number of targets, as shown in figure 1 shown

[0007] Finally, space-based radar needs to search the earth in a large area, and it is necessary to reserve enough space filling time when switching between different repetition frequencies and wave positions, resulting in a limited dwell time for each wave position and insufficient signal-to-noise ratio of target echoes. Reduces the probability of successfully deblurring the target

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