Broadband radar target positioning method based on phase speculation distance and angle

Abstract

The invention provides a broadband radar target positioning method based on the phase speculation distance and angle. The method comprises the following specific steps: acquiring a one-dimensional high-resolution range profile of each channel; based on the one-dimensional high-resolution distance image of each channel, obtaining a result of the speculation distance; calculating a cross-correlationresult of the one-dimensional high-resolution distance images corresponding to any two channels, and calculating an unambiguous interference phase according to the cross-correlation result; obtaininga target phase speculation angle result according to the unambiguous interference phase; and positioning of the target based on the results of the phase speculation distance and angle of the target.The method is based on the phase speculation distance and phase speculation angle theory, can achieve the high-precision positioning of the space target under the condition of a short baseline, and improves the positioning performance of the space target of a short baseline radar system.

Description

technical field [0001] The invention relates to a wideband radar target positioning method based on phase estimation distance and phase estimation angle, and belongs to the technical field of signal processing. Background technique [0002] Space target positioning is an old and innovative subject. At present, positioning algorithms based on long baseline conditions are relatively mature, such as Time of Arrival (TOA) method, Time Difference of Arrival (TDOA) method, Angle of Arrival (AOA) method. When the baseline is short, the positioning accuracy of the above methods deteriorates sharply. Therefore, it is necessary to discuss target positioning algorithms under short baseline conditions. This type of algorithm is suitable for application scenarios with special requirements on the baseline, such as vector miss measurement, spatial intersection and docking, etc. . At present, the positioning methods under short baseline conditions are mainly Doppler frequency-phase differ...

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Problems solved by technology

At present, the positioning methods under short baseline conditions are mainly Doppler frequency-phase difference method and instantaneous distance intersection positioning method. Among them, the Doppler frequency-phase difference method needs to solve a constrained nonlinear optimization problem, so the calculation amount is large. The method requires a long coherence time for system observation, and the measurement accuracy is easily affected by target fluctuations; the instantaneous distance intersection positioning method requires high ranging accuracy. Impulse radar is mainly used abroad, and impulse radar has high ranging accuracy. Accuracy, but it has high requirements on the instantaneous power of the transmitting device, the bandwidth and sampling rate of the digital receiving device

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