The Automotive Anti-collision Radar Signal Source K-band The Design And Implementation

As the tremendous progress in human industrial civilization and the rapid growth of the economy, car has become a kind of necessary vehicle in daily life. But the car has also caused many traffic accidents, which have become a very serious problem in our society. Automotive collision avoidance radar allows car drivers know the distance and speed of surrounding vehicles and it also can alert the driver at the crucial moment, and then avoid the occurrence of the accident. Meanwhile, this radar can also bring huge economic value. Therefore developing automotive collision avoidance radar has very important significance and widely applications. Now in China the automotive collision avoidance radar research is lack of the core components-the signal source, this paper is written for this situation and it then improve the traditional anti-collision radar transmitted waveform, complete the design of key components of the signal source PLL and DDS. The main work can be carried out as follows:First, I discuss traditional transmitted waveform and insert period point frequency in triangle-wave modulation for matching a plurality of target detection. Improved transmitted waveform has less difficulty in hardware and more simple digital signal processing.Then, this paper raises several engineering means. After comparing each technique’s phase noise, spurious, FM linearity, we find that the means of DDS mixer on K-band carrier frequency is the best one. In order to meet the needs of the collision avoidance radar ranging and its using environment, we carefully calculate and decide PLL and DDS Design specifications.Finally, the paper analyzes the general principle of the PLL and DDS. After choosing appropriate components and software simulation, we successfully designed24GHz PLL and triangle-wave modulation DDS. The test indicates that the24GHz PLL output power is10dBm,and its phase noise is better than-75dBc@1KHz,-73dBc@10KHz, that the DDS sweep output for150MHz-250MHz with insert point frequency of125MHz. The DDS’s output power flatness is less than0.5dB, and the proximal and distal spurious second harmonic suppression is greater than65dB, its phase noise is better than-96dBc@10KHz。...