- Frame: 'spherical'
- OriginPosition: 3-by-1 vector defining the offset of the radar from the origin of the ego vehicle's coordinate frame
- Orientation: 3-by-3 rotation matrix whose columns define the axes of the radar in the ego vehicle's coordinate frame (column 1 defines a unit vector pointing along the radar boresight, column 3 is a unit vector defining up for the radar, and column 3 is the cross-product of the up and boresight vectors - pointing to the left of the radar.
- HasVelocity: true
- HasElevation: false
'MeasurementNoise' Matrix in radarDetectionGenerator/objectDetection class in Automated Driving Systems Toolbox
5 次查看(过去 30 天)
显示 更早的评论
Hi, I am working with the Automated Driving Systems Toolbox of MATLAB for signal processing of detections obtained by Automotive Radar Sensor. If I create an artificial detection using the built-in tools of radarDetectionGenerator class, it calculates a MeasurementNoise matrix for the detection which is a Covariance matrix. But the thing is that I already have the detections and now I need to only register these detections in MATLAB, using the objectDetection class, for further processing and for that purpose, I need to provide MeasurementNoise matrix as input. I want to set the non-diagonal elements as zero and provide the variances as the diagonal values. It's a 3x3 matrix in my case and we know that the diagonal elements of a Covariance matrix are the variance values. I have got three variance values i.e. Range Variance, Velocity Variance and Azimuth Angle Variance. But I don't know the correct order in which these variances should be inserted into the Covariance matrix i.e. which variance should be at element index 11 of Covariance matrix, which one should be at 22 and similarly at 33? Could you please provide my any information in this regard. That would be very helpful.
0 个评论
采纳的回答
Trevor Roose
2017-11-13
Hi Wajahat,
If you want to load your own recorded data into MATLAB as objectDetections using the same format as the objectDetections generated by radarDetectionGenerator, you can follow the format found here in the documentation .
The order for the reported measurements and noise follows: [azimuth, elevation, range, range-rate], where elevation and range-rate may be omitted by setting the corresponding 'HasElevation' and 'HasVelocity' field on the MeasurementParameters structure for the objectDetection.
In your case, for the noise covariance, the azimuth variance is (1,1), the range covariance is (2,2) and the range-rate covariance is (3,3).
Since your recorded detections are reported using 'Sensor spherical' coordinates, you will need to set the MeasurementParameters for each objectDetection to a structure with fields set to:
This format will enable you to process the detections using the multiObjectTracker and the various filter initialization functions provided in the toolbox (e.g. initcvekf)
I hope this helps,
Trevor
3 个评论
Elad Kivelevitch
2017-11-16
编辑:Elad Kivelevitch
2017-11-16
Hi Wajahat,
Thank you for the question. An array with zero number of rows would be something like:
costMatrix = zeros(0,D);
where D is the number of detection you have in the call to update the tracker.
Please make sure that the costMatrix input has the same type as you would use later when there are tracks. To do so, please use:
costMatrix = zeros(0,D,'double')
or
costMatrix = zeros(0,D,'single')
Depending on the class your costMatrix is using.
I hope this helps,
Elad
更多回答(0 个)
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Automotive Radar 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!