Analysis And Research Of 24GHz Automotive Radar System And The Key Techniques Of The Frequency Source

In China, ITS field is still in its early stages of development and development of millimeter-wave radar is facing many problems. Although there are some companies and research institutes which have developed some radar products of 24 GHz and 77 GHz bands, but performance of most products do not meet the actual application requirements, and costs of product are too high. Finally, this will cause products is difficult to be promoted for use. In addition, in our country, use of the freqency about 24 GHz automotive radars is exsiting a big difference with other countries. This makes the most of MMIC, radar front-end modules and products do not meet the requirements of the domestic automotive radar systems. These problems in this topic provide a good meeting point and a starting point.Under the premise domestic development status and development in the field, In this paper, automotive millimeter-wave radar system and the frequency source, as the key technology in automotive millimeter-wave radar front-end circuit will be analyzed and researched. In order to accomplish the above two studies content, Firstly, this paper introduces the principle of millimeter-wave radar syste, the basic theory of PLL Frequency Synthesizer and the design theory of passive microstrip line bandpass filter and etc. Secondly, from automotive millimeter wave radar system-level concept and function, band division requirements, working modes, the restrict relationship between the system performance and microwave frequency source is analyzed and concluded. Supported by the related theory, This paper embarks from the hardware architecture of the phase-locked frequency source, and combining frequency source index for selection of the chip and circuit design, models the noise performance of the MMIC and ananlyzes the main working modes, then, uses PLL Design and Analysis Software to simulate the performance of the phase-locked frequency synthesizer with the corresponding conclusion. Finally, in this paper, the passive microstrip line band-pass filter circuit is designed and at the same time the results are simulated and optimized by ADS simulation software. In addition to, this paper selects the reasonable chips for adjustable attenuator and power amplifier with the simulation analysis. At last, the power supply of the transmitting frequency source has been carried on the demand analysis, accompanied by the corresponding chip selection guide.In this paper, the research aims to design a frequency source working in 24 GHz to 26.65 GHz frequency range which has an outstanding noise performance, the short phase lock time, adjustable working mode and controllable transmission power. This paper aims to make a contribution for China’s automotive millimeter-wave radar career by studying the work of the topic.