Abstract
Meter wave radar height measurement is one of the most difficult problems in meter wave radar system. At present, the most popular height measurement methods of meter wave radar include beam splitting method, MUSIC algorithm and maximum likelihood estimation method, which can achieve good performance under flat ground. However, the real ground is not ideal condition, and the situation of undulating ground is also very complicated. Under this condition, the performance of the above algorithm dropped sharply. Many researchers solve this problem by improving the robustness of the algorithm. However, the authors think that the key to solve the problem is to establish a refined height measurement signal model. In this paper, the accurate model of reflection coefficient, reflection height and reflection point under the condition of undulating ground are established to provide accurate signal model for meter wave radar height measurement. Then we deduce the application of generalized MUSIC algorithm and maximum likelihood estimation algorithm for MIMO radar in the accurate terrain signal model. In fact, the method proposed in this paper is a terrain matching MIMO radar target height measurement, and the traditional algorithm can be regarded as terrain mismatch. The simulation results show that the accuracy of terrain matching estimation of the precise signal model established in this paper is much better than that of the traditional simplified signal model.
Highlights
With the development of stealth technology, meter wave radar has ushered in World War II because of its strong anti stealth ability
Meter wave radar has a wide beam and low band [1], [2], and there is multipath effect in low elevation area, which means that direct wave and reflected wave are regarded as a group of coherent signals
In order to solve the problem of mismatching with the actual signal model, Reference [5] derived a meter wave radar multipath signal model under complex terrain, and proposed a new height estimation method based on alternating projection
Summary
With the development of stealth technology, meter wave radar has ushered in World War II because of its strong anti stealth ability. Reference [3] proposed a low elevation height measurement method based on lobes beam splitting due to ground reflection with wide beam width of meter wave radar. In order to solve the problem of mismatching with the actual signal model, Reference [5] derived a meter wave radar multipath signal model under complex terrain, and proposed a new height estimation method based on alternating projection. For co-located meter wave MIMO array radar, height measurement methods include maximum likelihood [13], [14], generalized MUSIC [15], intelligent algorithm [16], [17], beam splitting algorithm [18], time reversal and other technologies [19]. This work appeared in part in the Reference [23]
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