Car radar are generally more reliable

TIPS,TRICK,VIRAL,INFO

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

The acknowledged signal is as well as low-cost advanced designs. Through the acquisition of incline counsel to combine the reflected signal the need for mechanical scanning antenna or phased array antenna, and a amalgamation of digital bunching algorithm. Antenna at the back the general homodyne receiver like a lot of channels, this is the antenna design - for the simple rotating antenna, an array of 16

Reuter said: "The heir output is a baseband signal of the DC-20-MHz band." Design subsequently fine azimuth complete 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 reach lengths of up to 2K sampling of the transformation. Reuter said: "In the past, comport yourself 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 speed of data extracted from the signal shown in Figure 3.

In fact, multiple-FMCW analog channel, the formation of this front-end direction 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 more or less the vehicle, location and attributes of the object.

Reuter explained: "You need to identify goals, to cut off them from the background, pick the most essential one. You may habit to settlement when 200 goals, therefore, the adding together will be extremely complex, especially to extract angle information.

The beast configuration of the system have become increasingly complex. Reuter said that the management of the sensor itself. In contrast, ADC dedicated analog interface, a dedicated digital signal car dvd performer and in car dvd player management hardware interface for the FFT, the microcontroller interface to extract the target, and its classification. plan counsel is input to the vehicle control area network (CAN) or FlexRay bus, the central CPU cluster, their explanation and analysis.

The entire pipeline has a lot of bandwidth and delay requirements. Reuter CPU notes of the data generally presents a graphical display to the driver, that is, accomplished to observe him through the windshield to the tummy of the multifunction display. This contaminated display a maximum of 50-ms update interval, as competently as more challenging 50-ms delay. Otherwise, the image will be no question stable, there will be lag through the windshield of the image, it may guide to driver misjudgment.

With the system developed to withhold the feign of the bunching merged sensors from one sensor, in order to accomplish camera data fusion, the Internet architecture has as well as 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 birds of the problem.