Car radar are generally more reliable

TIPS,TRICK,VIRAL,INFO

In fact, multiple-FMCW analog channel, the formation of this front-end management unit processes the input digital bit streams

The standard signal is as a consequence low-cost radical designs. Through the acquisition of slant instruction to amassed the reflected signal the craving for mechanical scanning antenna or phased array antenna, and a incorporation of digital bunching algorithm. Antenna astern the general homodyne receiver subsequently a lot of channels, this is the antenna design - for the simple rotating antenna, an array of 16

Reuter said: "The receiver output is a baseband signal of the DC-20-MHz band." Design like fine azimuth fixed of the system will be channels 8-16, 8-16 high-speed analog-to-digital converters (ADC ).

Digital baseband signal from each channel into the fast Fourier transform (FFT) module to attain lengths of up to 2K sampling of the transformation. Reuter said: "In the past, behave an FFT means that requires a lot of FPGA Today, the trend is integrated floating-point DSP accelerator 32-bit microcontrollers." Bunching system can use two FFT scope and keenness of data extracted from the signal shown in Figure 3.

In fact, multiple-FMCW analog channel, the formation of this front-end dispensation unit processes the input digital bit stream of the azimuth / range / rapidity of the array. This data stream into one or more CPU cores, the software will be supported by additional accelerators are infer whether there are objects going on for the vehicle, location and attributes of the object.

Reuter explained: "You need to identify goals, to separate them from the background, select the most essential one. You may infatuation to agreement taking into consideration 200 goals, therefore, the toting up will be completely complex, especially to extract angle information.

The bodily configuration of the system have become increasingly complex. Reuter said that the organization of the sensor itself. In contrast, ADC dedicated analog interface, a dedicated digital signal car dvd artist and in car dvd artiste dispensation hardware interface for the FFT, the microcontroller interface to extract the target, and its classification. endeavor opinion is input to the vehicle direct area network (CAN) or FlexRay bus, the central CPU cluster, their observations and analysis.

The entire pipeline has a lot of bandwidth and end requirements. Reuter CPU observations of the data generally presents a graphical display to the driver, that is, skilled to observe him through the windshield to the belly of the multifunction display. This poisoned display a maximum of 50-ms update interval, as well as more challenging 50-ms delay. Otherwise, the image will be unquestionably stable, there will be lag through the windshield of the image, it may guide to driver misjudgment.

With the system developed to preserve the proceed of the bunching fused sensors from one sensor, in order to achieve camera data fusion, the Internet architecture has after that changed. Reuter said: "use Ethernet to abbreviate the cost of demand." However, the system still requires real-time, brought how to ensure that the Ethernet real-time nature of the problem.