Other Parts Discussed in Thread: AWR1843
Hello,
- Q01
Radar Distance Resolution ( Dist Res ) = (c /2)*(1/BW)
AWR1843 BW can be as high as 4GHz à DistRes = (300*106)/(2*4*109) ~4cm (“”-P.4).
Therefore, we potentially can distinguish objects that are ~4cm apart in the radial direction. Correct?
- Q02
Velocity Resolution ( Vel Res )= λ/(2*Tf)
For AWR1843 we use λ ~ 3.8mm (at 77GHz) à Vel Res ~ 0.3m/sec. This means objects that move slower than ~0.3 m/sec cannot be distinguished using AWR1843. Correct?
- Q03
The velocity resolution calculated in Q02 is useful only if motion is in the radial direction (ie when the object is moving towards or away from the radar). If the object is moving in a tangential direction it cannot be distinguished using Doppler effect. Correct?
- Q04
Angular resolution of AWR1843 (when we employ MIMO) is 15 degrees. Correct?
We can use that to distinguish stationary or moving objects. Motion in that case must be in the tangential direction. Correct?
- Q05
Based on Q1 & Q2 above (with the help of 2D FFT), in case of AWR1843, we will probably be able to distinguish large number of objects (using velocity and range) but we will not be able to know their exact angular location. This is because the angular resolution is limited to 15 degrees. Correct?
- Q06
In some applications of AWR1843 (eg SRR USRR) the number of objects that can we can actually detect is 200. This is a memory and processing power limit, not a limit imposed by range resolution or velocity resolution. Correct?
- Q07
In some applications of AWR1843 (eg SRR USRR) the number of objects that can we can actually track is 24. This is a memory and processing power limit, not a limit imposed by range resolution or velocity resolution. Correct?
- Q08
Our practical observation when we used AWR1843 is that we cannot distinguish static objects using that are 4cm (or even 40cm) apart, even in the radial direction. Any explanation?
- Q09
You track an object by finding velocities, angular position and radial distance of all objects in two consecutive frames and correlating these three quantities in the two frames. Correct? In all cases can you please refer us to a document that describes the tracking process.
- Q10
The outcome of any TI radar code/demo is;
- Objects. Each is represented using a point (x, y & z) and a velocity (vx, vy & vz). Correct?
- Clusters. Each is represented using a point (x, y & z) and a velocity (vx, vy & vz). Correct?
- Tracked Objects. Each is represented using a point (x, y & z) and a velocity (vx, vy & vz). Correct?
- Q11
What is the relationship between a cluster and an object? Is the cluster part of an object?
- Q12
These objects, clusters and tracked objects are all detected in the DSP. All FFT2 calculations are done also in the DSP. The cortex MCU just receives these results and we make it available to us or to the GUI. Correct?
Regards
Sameh