By making full use of complementary metal oxide semiconductor (CMOS) technology, TI has launched a full end-to-end development platform before the integration of embedded microcontrollers (MCUs) and digital signal processing (DSP) and intelligent radar front ends. 76-81GHz sensor series: AWR1X and IWR1X. The five devices in the new millimeter wave sensor product combination have a distance resolution of less than 4 cm, with a distance of less than less than 50 microns, with a range of 300 meters. At the same time, power consumption and circuit board areas are reduced by 50%.
Say goodbye silicon
Among them, AWR12 is primarily applied to adaptive cruise, AEB, etc. emphasizes high-precision, high-speed long-distance radar applications; AWR14 increases MCU (using ARM Cortex-R4F core), which can be played in some previously bonded body sensor detection applications. Role, such as opening actions, car week detection, detection driver's breathing and heartbeat, and occupant monitoring, AWR16 is a single-chip solution, integrated with RF, MCU and DSP processing, and typical application is the environment around the vehicle Blind spots detection, anti-rear collision / warning, lane change assist, traffic intersection alarm, etc., and thus establish a 3D perceived environment around the vehicle.
At present, most commercial radar systems, particularly radar systems in the Advanced Driver Assistant System (ADAS), are based on germanium silicon (SiGe) technology. Despite performance compliance, the Sudipto Bose, Director of TI Car Radar Product Marketing, believes that its main disadvantage is that the volume is too large, too bulky, and occupies a large number of board space. "To establish a complete vehicle 3D perceptual system, at least 10 radar sensors in front of the car, the restriction on the space is required to require a smaller volume, lower power consumption, and cost performance Higher, SiGe-based radar systems will become more difficult to meet the requirements. "
Sudipto Bose, Director of TI Car Radar Product Marketing
Take the 79GHz band as an example, which provides 4GHz bandwidth, which is critical to higher resolution. Future radar systems will also need to support short distances to convert better angular resolution into more antennas within the radar system. The traditional advantages of CMOS technology include higher transistor density and lower power. Digital scaling within CMOS reduces power, narrowing the size and enhances the performance of each node. At the same time, CMOS technology further enhances the ability to embed digital functions in analog components, thereby achieving a new system configuration and topology in the deployment of radar systems.
Why choose 76-81GHz band?
Typically, developers have encountered hindrances when creating American Automotive Engineers (SAE) International Level 2 and above function in vehicles, mainly from sensor size and power supply for specific components. By configuring the TI AWR1X millimeter wave product portfolio, the design person can not only realize ISO 26262 of automobile safety integrity level (ASIL-B), but also provide new features such as automatic parking assist, pedestrian detection, and carrier and driver monitoring.
In terms of intelligence and environmental flexibility, the AWR1X series can dynamically adapt to changing conditions and conditions, support multiple functional patterns to avoid false positives and provide a wide range of applications. "Dynamic frequency adjustment is a very important feature." Sudipto Bose said that as the vehicle radar is used, the vehicle needs to be able to realize the frequency of the other vehicle radar, and perform real-time via the in-vehicle electric control unit and bus Dynamic adjustment. At the same time, radar sensors must also be able to sensipize through plastics, dry walls, clothes, glass and many other materials, as well as environmental conditions such as light, rainfall, dust, fog or frost.
The reason why chooses the 76-81GHz band, not the 24GHz band of other vendors, Sudipto Bose explained that from 24GHz to 77GHz migration is already "trend", because the accuracy of radar detection depends on the effective frequency band of radar transmit pulses, 24GHz Only 0.5 mega bandwidth is used to sample, but up to 5-6g in 77 GHz, which brings a significant increase in accuracy. In addition, the 77 GHz antenna is short, and the antenna design of 1/4 band will be reduced by 24GHz, and the entire product will be much smaller than 24GHz.
Introduce millimeter wave sensing into industrial applications
Millimeter wave sensor technology is very successful in the automotive sector, but designers are currently addressing the challenges faced by this technology to other markets, such as building and factory automation applications. The problem encountered in the above field is that the previous radar system is a discrete design that leads to complex hardware design and software development, and improves the threshold of the access.
"But the launch of single-chip 10mmx10mm IWR1X sensor reduces the threshold for millimeter wave sensing." Robert Ferguson, director of TI Industrial Radar Product Marketing, said, using IWR1X sensors, users do not have to deal with the discrete front end, modulus conversion Complex high-speed data and communication lines between devices and processing devices do not have to handle additional size, power, and supports their related material listings. Moreover, this integration also simplifies the software design process, greatly simplifies device configuration, monitoring, and calibration. The engineers can start their application design within less than 30 minutes by using the TI millimeter wave software development kit (SDK) including the example algorithm and the software library. 20170523-TI-2Ti Industrial Radar Product Marketing Director Robert Ferguson
Robert Ferguson lists three most typical industrial application scenarios: liquid level sensing, traffic monitoring and drone.
Level sensation is an important part of storage and measurement of different chemicals in the factory. Since these chemicals have corrosive or toxicity, the remaining liquid volume must be measured without direct contact. MMWave sensing provides high precision measurements, and has robust durability under environmental conditions such as dust, smoke or extreme temperatures. The IWR1X RF front end is highly linear, its ultra-wide (continuous 4GHz, 5GHz splicing) bandwidth can achieve extremely precise mild measurements in liquid tanks in depths 1m to 80m. The power optimization design for the 77 GHz grade transmitter reference design gives IWR1443 that optimizes running within 4-20mA power restricted systems.
The purpose of traffic monitoring is to make timely response to the intersection of the intersection by mastering specific information and remote sensing data related to vehicles and pedestrians, and collect traffic statistics to increase transportation efficiency. The millimeter wave sensor can achieve measurements of the vehicle position and rate, and can detect the rate of up to 300 kPh, an object that is 150m and a further range.
In order to achieve safety, improve the productivity of the platform, drone designers face many challenges, including allowing drones to explore obstacles, and provide assistance for operators in the most dangerous flight. The drone requires high-speed object detection function, and can track an object having a number of centimeters in a 100m distance, such as when the drone is close to the ground or is operated around the object. Since the drone is running by the battery, in order to extend the flight time and improve the payload, the solution should be small and the weight is light.
Original link: https://www.eeboard.com/news/cmos-3/
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