Cooperative Air and Ground Surveillance. Wenzhe Li. Outline. Introduction Experimental Testbed Framework Air-Ground coordination Experiment Results Conclusion. Introduction. The use of robots in surveillance and exploration is gaining prominence. Surveillance Target detection
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Cooperative Air and Ground Surveillance
The use of robots in surveillance and exploration is gaining prominence.
Advantage: Move rapidly, Cover large area
Disadvantage: Low accuracy for localization
Advantage: High accuracy for localization
Disadvantage: Not move rapidly, can not see through
Main idea arise from answering question :
How to make it both Move rapidly and Accurately locate target ?
In this paper, authors present the approach to cooperative search, identification, and localization of targets using a heterogeneous team of fixed-wing UAV and UGVs.
Three major topics.
◆ onboard embedded PC
◆ IMU 3DM-G from MicroStrain
◆ external global positioning system (GPS): Superstar GPS receiver from CMC electronics,
10 Hz data
◆ camera DragonFly IEEE-1394 1024 × 768 at 15
frames/s from Point Grey Research
◆ custom-designed camera-IMU Pod includes the
IMU and the camera mounted on the same plate.
The plate is soft mounted on four points inside the
pod. Furthermore, the pan motion of the pod can be
controlled through an external-user PWM port on
Screen clipping taken: 2010/3/29, 11:11
certainty grid is a discretestate binary random field in which each element encodes the probability of the corresponding grid cell being in a particular state
1. Yd,i(k|k) = logP(x) = logP(s(Ci) = target).
where subscript d denotes detection, stores the accumulated target detection certainty for cell i at time k
2. id,s(k) = logP(z(k)|x)
Information associated with the likelihood of sensor measurements z
3. Updated by the log-likelihood form of Bayes rule:
Identify cells that have an acceptably high probability of containing features or targets of interest.
Yf,i(k | k)
Information-based utility measures
1. First, detection of an unknown number of ground features in a specified search area ˆyd (k|k).
2. The refinement of the location estimates for each detected feature Yf,i(k|k).
where U is the set of available actions, and If,i(ui(k)) is the mutual information gain for the feature location estimates given action ui(k).
Aerial images of the test site captured during a typical UAV flyover at 65 m altitude. Three orange ground features highlighted by white boxes are visible during the pass.
1. When only use UAVs : In excess of 50 passes (about 80 min of flight time)
2. When only use UGVs : In excess of half an hour for the ground vehicle
3. When they are collaborative:
completes this task in under 10 min
1. Methodology is transparent to the pecificity
and the identity of the cooperating vehicles.
2. Computations for estimation and
control are decentralized
3. Methodology presented here is scalable
to large numbers of vehicles.