Abstract
Multiple-input multiple-output (MIMO) radar is playing an important role in military and civilian fields. However, radio frequency (RF) multi-links have a large data-processing capacity and the system is bulky and complex. Therefore, a single-link RF MIMO has been the subject of heated discussed in recent years. Single-link technology shares the same regularity with that of the multi-link MIMO system, which makes the MIMO system simpler in structure without affecting its performance. In this study, a 2 × 2 array single RF link MIMO radar at X band was designed by combining MIMO radar with the concept of a single RF link in the communication field, and a simulation platform for studying its properties was established using SystemVue software. The whole system is controlled by the exclusive OR (XOR) operation results of two transmission signals, and one signal can control the antenna-switching signal to form a variety of orthogonal bases. The received two original signals are demodulated and the control signals enter the corresponding matched filters. The signal is processed by fast Fourier transformation (FFT) and the cell-averaging constant false alarm rate algorithm (CA-CFAR) is used to judge the signal. For multiple measurements, the Monte Carlo method was adopted to obtain its mean value as the final result. Compared with the traditional MIMO radar performance in acquiring the target position, speed, and detection probability, the results show that the computation time can be greatly reduced (due to decrease in the number of links in MIMO radar system) without any deterioration in the MIMO radar performance. The single RF link technology provides a broad prospect for the miniaturization of small radar applications.
Highlights
Multiple-input multiple-output (MIMO) radar technology was formally introduced in 2004 [1].The concept of MIMO radar is widely used in various military and civilian equipment
Traditional MIMO radar has adopted many proposed ideas to optimize its array structure or the parameter calculations, which have mostly originated from sparse arrays using the genetic algorithm or the particle swarm algorithm to transform the array arrangement into an optimal distribution of the extreme value functions
Starting from the theory of antenna and communication, this paper discussed the new concept of single radio frequency (RF) link MIMO radar to solve the problem of the bulky size and large amount of information processing in wireless systems
Summary
Multiple-input multiple-output (MIMO) radar technology was formally introduced in 2004 [1]. The concept of MIMO radar is widely used in various military and civilian equipment. It has attracted much attention due to its high positioning accuracy, low-speed moving-target detection performance, and very low interception probability [2,3,4]. At the receiving end of MIMO radar, each receiving element receives all the transmitted signals and acquires multiple echo signals by matching the filter after signal processing of clutter filtering. MIMO radar can detect targets by transmitting multiple orthogonal signals. The mutual coupling phenomenon is obvious between the MIMO radar antenna array elements if the element distance is Symmetry 2018, 10, 130; doi:10.3390/sym10050130 www.mdpi.com/journal/symmetry
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