Millimeter wave landing radar is one of the important payloads of deep space landing probes, providing the landing probe with its distance and velocity information relative to the landing surface in the landing descent process to ensure landing accuracy and safety, and the landers of Chinese Chang'e Lunar Exploration Project and Mars Exploration Project are all equipped with millimeter wave landing radar. In this paper, a novel microwave landing radar with hybrid pulsedoppler and continuous wave work mode is presented. Analog and digital circuit integration technology with characteristics of light weight and small size is utilized to miniaturize the subsystems design,. This novel design can be applied to the follow-up project applications such as Chang'e Lunar Exploration Projects and manned lunar exploration.
Antenna cross-polarization isolation is one of the important specifications of radar systems using the phase-comparison angular measurement algorithm. In this paper, the effect of antenna cross-polarization isolation on the angular measurement error of this phase-comparison algorithm is modeled and analyzed. First, a mathematical model of the phase-comparison angle measurement algorithm with antenna cross-polarization components is developed. Subsequently, the detailed effects of antenna cross-polarization isolation on the angular measurement accuracy are given in the context of system engineering experience, and then quantitative conclusions are given. The proposed analytical model and quantitative results can be used in the measurement accuracy analysis of the phase-comparison monopulse angle measurement algorithm for radar systems. And these results can be also used as a criterion in specifying the antenna cross-polarization isolation in a radar system design.
Aiming at the problem of short-range high-speed bullet trajectory measurement under clutter background, a new signal processing method used for practical radar system is proposed. Firstly, an introduction of the high-speed bullet target detection system is described. Secondly, the high-speed moving target echo is derived and analyzed. Then the processing algorithm is presented, in which a parallel multi-channel search processing and an iterative high-speed target matching processing are designed. Finally, the effectiveness of the designed processing algorithm is verified using a ground experimental radar system.
An efficient hybrid algorithm is proposed to analyze the electromagnetic scattering properties of metal objects in the lower terahertz (THz) frequency. The metal object can be viewed as perfectly electrical conducting object with a slightly rough surface in the lower THz region. Hence the THz scattered field from metal object can be divided into coherent and incoherent parts. The physical optics and truncated-wedge incremental-length diffraction coefficients methods are combined to compute the coherent part; while the small perturbation method is used for the incoherent part. With the MonteCarlo method, the radar cross section of the rough metal surface is computed by the multilevel fast multipole algorithm and the proposed hybrid algorithm, respectively. The numerical results show that the proposed algorithm has good accuracy to simulate the scattering properties rapidly in the lower THz region.
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