A fda-mimo radar moving target detection method and system

Abstract

The invention discloses a FDA-MIMO radar moving target detection method: Step 1: Construct a data matrix to be detected and a training sample matrix, and determine the target angle and Doppler frequency corresponding to the unit to be detected; Step 2: According to the training The sample matrix constructs a sampling covariance matrix, constructs a transmitting and receiving steering vector according to the target angle, constructs a Doppler steering vector according to the target Doppler frequency; step 3: utilizes the data matrix to be detected, the sampling covariance matrix, Transmitting and receiving the steering vector and the Doppler steering vector to construct a detection statistic; Step 4: Calculate the detection threshold according to the data dimension and the false alarm probability set by the system; Step 5: Compare the detection statistic with the detection The size of the threshold makes a judgment on whether the target exists. The invention greatly simplifies the detection process, reduces the computational complexity, and improves the detection performance. The invention also provides a corresponding FDA-MIMO radar moving target detection system.

Description

technical field [0001] The invention belongs to the technical field of radar signal detection, and more specifically relates to a method and system for detecting an FDA-MIMO radar moving target. Background technique [0002] At present, the electromagnetic environment faced by radar is becoming more and more complex. Radar is not only affected by high-intensity ground-sea clutter, but also faces damage from strong electromagnetic interference from the enemy. In order to ensure and improve the effectiveness of radar in the actual combat environment, it is necessary to continuously explore new radar technologies and develop new system radars. Multiple-Input Multiple-Output (MIMO) radar and Frequency Diversity Array (FDA) radar are two new radar systems that have emerged in recent years. MIMO radar transmits multiple waveforms through multiple antennas to detect targets. Due to the use of waveform degrees of freedom, MIMO radar can provide more useful information, which is con...

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Problems solved by technology

Patent document CN112363151A (Adaptive Target Detection Method for Frequency Diversity Array Multi-Input Multi-Output Radar) based on the idea of ​​adaptive detection, an effective FDA-MIMO radar target detection method is designed, but this method is only based on one pulse data, which is not sufficient Using the motion information of the target, the detection performance of the moving target is insufficient; the paper (R. Gui, W.-Q. Wang, and Z.Zheng, “Low-complexity GLRT for FDA radar without training data,” DigitalSignal Processing, vol. 107, p.102861, 2020.) Based on multiple pulse data of FDA-MIMO radar, an adaptive detection method is proposed. Although this method considers the motion information of the target, it does not use training samples and has limited detection performance.

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