A Broadband Radar Target Location Method Based on Phase Inference Range and Phase Inference Angle

Abstract

The present invention provides a broadband radar target location method based on phase estimation distance and phase estimation angle, the specific process is: obtaining the one-dimensional high-resolution range image of each channel; based on the one-dimensional high-resolution range image of each channel, obtaining the phase The result of the inferred distance; for the one-dimensional high-resolution range image corresponding to any two channels, calculate the cross-correlation result, and calculate the unambiguous interferometric phase based on it; obtain the target phase inferred angle result based on the unambiguous interferometric phase; The results of the target phase estimation distance and phase estimation angle are used to complete the positioning of the target. The method of the invention is based on the theory of phase estimation distance and phase estimation angle, can realize high-precision positioning of space targets under the short baseline condition, and improves the space target positioning performance of the 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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