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ClearWay Frequently Asked Questions

Is there anything special about 77GHz radar?
Navtech radar sensors operate at 77 GHz for two reasons. Firstly this band is licence free in many countries around the world, making it easier to install. Secondly, higher frequencies enable better resolution in a smaller physical size. For example, a 24GHz would need to be 3 times the size to achieve the same resolution.
What is the resolution of the radar sensor?
The resolution of the radar sensor is 25cm in Range and 1.8 degrees in Azimuth.
What is the technology used? Is it a Doppler radar?
The technology is Frequency Modulated Continuous Wave (FMCW). Target speed is calculated from successive observations, within the software, as such there is no requirement for Doppler processing. This improves the processing performance, and provides more accurate data.
Can the radar be used in very cold weather e.g. mountain / arctic conditions?
The sensor operating temperature is -20 to 60 degrees Centigrade, all sensors have a heater built in that allows the sensor to operate at even lower temperatures
What are the power requirements of the radar sensor?
Each radar requires a 24Vdc 20 Watt (or 60 Watt with heater) power supply. A 5m power cable is supplied with each unit. A power supply is available from Navtech Radar and typically purchased with each unit.
What are the data connection bandwidth requirements of each radar?
Each radar sensor continuously delivers up to 12Mbps when in service. Networks should be capable of handling this data throughput with low latency (<15ms). We are currently working on an enhancement to the radar, that will see the bulk of the data processing occuring near to, or within the radar, reducing the data output to a few kbps. Contact Navtech for details.
What is the power output of the radar? Is it a danger to health?
The power emitted is less than 15mW, much less than a mobile phone (~500mW).
What is the service interval of each radar?
The radar needs no maintenance, other than a preventative service at the 5 year point. This consists of replacing the rotating assembly inside the radar unit. A service typically takes less than 30 minutes be a trained service engineer.
What is the ROM budgetary cost of a system?
The ClearWay system it totally scaleable. It could range from one sensor to several hundred. Please contact us with your project details and we would be happy to advise on ROM budgetary costs based on your requirement.
What is the effect of rain on the radar?
Radar is mostly unaffected by rain. Heavy rain conditions however might slightly reduce the maximum range the radar can reliably detect. This should have no effect on the number of false alarms
What is the coverage of each radar sensor?
The instrumented range of each sensor is 500m for vehicles and 350m for pedestrians. This is the maximum range in ideal conditions. In practice, installation ranges are typically shorter and depend on line of sight, and availability of roadside connection points. Line of sight is dependent on the complexity of the road (undulations, curvature in the road, density of traffic, number of lanes, location of road furniture, location of trees etc.) and performance requirements e.g. 100% coverage. Hence, practical installation distances may typically be half the instrumented range. We strongly recommend that you consider a site survey or consult with one of our team or a trained partner to advise on the best approach for your application.
What is the ideal mounting height?
The nominal mounting height is between 4 to 5 metres for the standard radar range, though actual mounting height can vary depending on the specific site.
What happens if you have more than one target? Is there any a limit to how many targets the radar can track?
The number of targets the software can track is virtually unlimited and depends on the processing server spec. Simulations have been done with around 200 tracks simultaneously.
Can the radar discriminate between people, motorcycles, cars, and trucks?
ClearWay provides multiple vehicle classifications that are user definable. The system also identifies people and debris.
How does the radar measure speed, and is it enforceable?
The software measures the target speed using the information of the movement in space over time. No certification is currently available.
Do radar incident alarms direct the camera to the incident (e.g. track the vehicle) or a zone?
Radar alarms will direct a configured camera to the incident zone. Configuring cameras within our software is possible but not recommended for large installations
Does the ClearWay application integrate with 3rd party software?
Yes, ClearWay provides a custom XML input/output capability to which 3rd party software can integrate.
Does ClearWay provide other interfaces?
ClearWay can interface to multiple ethernet relay units, providing multiples of 6 digital inputs and 6 relay outputs. These I/O lines can be linked to various actions/events within ClearWay.
What training is offered?
Navtech offers both customer and system integrator (SI) training. Customer training enables a user to respond to and interact with the ClearWay system. Integrator training includes customer training, commissioning of the radar, camera and ancillaries, as well as training on how to deliver the Navtech sales message in support of your own business development activities.
Which cameras does ClearWay support?
ClearWay currently supports a selection of cameras, as detailed in the camera control datasheet. Additional cameras can be added if they support Pelco D absolute positioning commands 0x4B, 0x4D and 0x4F, or adhere to the Onvif protocol.