Joint estimation CRLB-based distributed radar optimal configuration constructing method

Abstract

The invention discloses a joint estimation CRLB-based distributed radar optimal configuration constructing method. According to the method, a distributed radar network is equivalent to a large-aperture radar so as to perform radar detection performance analysis; the CRLB for equivalent single base distance and equivalent single base target angle estimation is derived; an optimization model with the minimizing the CRLB as an objective function is constructed; the limitations of the location of the radar in practical application are considered; the constraint conditions of the observation angles of each radar node are added in the model; and by means of rigorous mathematical derivation, a practically feasible optimal network configuration and the analytic expression thereof are obtained. Therefore, the method of the invention has high practical feasibility and reliability.

Description

technical field [0001] The invention belongs to the technical field of distributed radar, and in particular relates to a method for constructing an optimal configuration of a distributed radar network based on joint estimation CRLB. Background technique [0002] Low-frequency band (such as P-band) radar system has attracted extensive attention because of its unique advantages in detecting high-speed weakly scattering targets. However, due to the long wavelength of the low-frequency signal, the beam width of the signal is large when the antenna scale is fixed, which will lead to poor angle measurement accuracy of a single radar. To solve the above problems, one of the methods is to introduce the concept of distributed radar into the low-frequency radar system, and use the wide-area distribution topology of distributed radar in space to achieve high-precision angle measurement. At present, the United States, Germany, the United Kingdom, and China's Nanjing Institute of Electr...

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Problems solved by technology

H.Godrich et al. in the United States proposed a station layout optimization method based on the joint positioning accuracy of the target’s horizontal and vertical coordinates, and solved the analytical expression for the optimal configuration of the radar network. However, in its optimal configuration, the radar network Each transmitting node and receiving node are evenly distributed on the circle with the target as the center. However, in most radar detection scenarios, the incoming target is generally located on one side of the radar network and will not appear in the radar proposed by H. Godrich et al. The center of the circle where the network is located, and the target is always in motion. Therefore, this network layout topology is not practical in most radar detection scenarios

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