Applications > Automotive > Radar for Safety Applications


            Radar Sensors

            for

            Safety Applications                    AN_013

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Implement Radar based Safety solutions for Agricoltural, Offroad  Vehicles and  Industrial Machinery (AN_013)

Bluewind designs Radar solutions exploiting Infineon small, reliable and cheap Radar components that enable a range of industrial and consumer applications unthinkable before.

The development of safety-related electronic devices combines the choice of hardware and software parts that comply with regulations and company requirements.
 
Safety Applications with Radar

Industrial applications where safety is mandatory require reliable sensing of the presence of humans, animals and objects in any possible environmental condition.

Emerging outdoor applications must meet the minimum requirement that a special situation,  where sensing is not possible due to upredictable conditions, is at least detected and signaled to the upper layers. Moreover, a decision about this condition must be taken by the system without any doubt.
In this case false negatives are not acceptable, while false positives may rise the costs of operations.
Radar Sensors however are not limited to obstacle presence detection.

Other new applications which require measuring distances and speeds,  detecting shapes, and even sensing vital parameters of humans can nowadays be evaluated and developed without high budgets.
 
Radar basics
 
The principles of a radar system are very simple. A microwave signal source emits a radio frequency signal which is reflected by a moving object. The receiver antenna picks up the reflected signal and mixes it with the transmitted signal.
A moving object generates a low frequency Doppler output signal (called IF) which can be processed to trigger an event. Using math and tricks it's then possible to detect fixed objects, distances and compute geometry and path information.

The generated Doppler signal (IF) is a sinewave in the range of a few KHz. This enables using computing platforms that, for selected applications, can start from a very common and inexpensive microcontroller, i.e. of the Cortex M3 class.
However, care must be taken: higher performances and redundancy may of course be needed due to Safety concerns and complex position and path detect algorithms.

Infineon industrial and consumer solutions use a radar frequency of 24GHz. This enables complying with existing regulations for radio frequency emission all over the world while maintaining a small antenna size, high directivity and moderate far field loss.
 
Comparing Radar vs Other Technologies

Radar sensing uses microwave frequencies to detect motion and distance.
It is fairly robust against atmospheric conditions and allows several intersting measurement possibilites. If compared to other technologies known today its advantages are clearly surpassing the potential disadvantage of its complexity.
 
> Maximum Distance: 150-200m
 
> Radial Movement: Good
 
> Tangential Movement: Poor
 
> Speed Range: >500km/hr
 
> Field Pattern Adjustment: Poor (except if
  using phased array antenna)

> Stationary Object Detection: Good
> Environmental Influences: Rain

> Measurament Capabilities: Good

> Product Cost (Movement Detection):
   Moderate

> Design Esthetics: Can be concealed
  (Limits)
 
Infrared
Sensors work by detecting the infrared radiation emitted by any moving object in front of it. Low cost technology, most widely used but highly sensitive to atmospheric effects.

Ultrasonic
Transmits sound waves and evaluates the received echo signal to calculate the distance and speed of a moving object. Sensitive to atmospheric conditions and also limited in distance.

Laser
Performs measurement by sending out a laser pulse towards the object. Narrow beam and requires line of sight, high cost and highly sensitive to atmospheric conditions and dust.
 
Radar Antenna

Selecting the right antenna solution for a radar based application is critical to its success.
An antenna in the context of radar applications refers to a very small and robust subsystem that combines the physical antenna array and the high frequency circuitry, where the latest generation Infineon components are being deployed.
 
An antenna must fit the needs for the application and is selected based on cost, performance and geometry requirements. Bluewind partners with selected European companies that develop and produce end user radar antenna solutions to the Industrial, Consumer and Automotive segments.
 
Bluewind support for Infineon Radar Solutions

Bluewind has been developing Industrial products using Infineon parts since 15+ years, gaining experience in the development of Safety products, and with a committment to support applications based on Infineon radar solutions during all stages. ( > See all applications at Bluewind)
 
> Safety issues analysis

> Critical Components selection
 
> Software tools and libraries for Safety and performance

> Schematic and printed circuit board design and review
 
> Production process quality
 
> Compliance to international regulations and product standards
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