Bashundhara R/A Avenue Simulation Canvas & 4-GPS Trilateration Radar
Bashundhara Boulevard: Trees • Divider • Pedal Rickshaw
Rickshaw (āĻĒāĻžā§ā§ āĻāĻžāĻ˛āĻžāĻ¨ā§ āĻ°āĻŋāĻāĻļāĻž)
Cartoon Pedestrian (āĻāĻŦā§āĻ˛ āĻāĻžāĻ)
Median Avenue Trees
Fixed Roadside Sensor
MANUAL DRIVE
⨠Keyboard Driving: Use Arrow Keys or W, A, S, D to steer the rickshaw • Spacebar to ring bell • Or click and drag anywhere on the road canvas.
Fixed Roadside GPS Reference Stations (Haversine Ranges)
Bashundhara Base NetworkMathematical Trilateration Engine (Closed-Form Least Squares)
Matrix SolutionLeast-Squares Normal Equation for $N \ge 3$ Sensors:
$$\mathbf{x} = (A^T A)^{-1} A^T \mathbf{b}$$
Linearized range intersection relative to Anchor Node 1:
$2(x_i - x_1)x + 2(y_i - y_1)y = (x_i^2 - x_1^2) + (y_i^2 - y_1^2) + (d_1^2 - d_i^2)$
Ground Truth GPS:
23.810200°N, 90.431200°E
4-Node Trilateration Est:
23.810200°N, 90.431200°E
Local Coordinates $(X, Y)$:
X: 20.4 m, Y: 33.3 m
Residual Error ($\text{RMSE}$):
± 0.0018 m (sub-cm)
Corridor Flow Check:
Eastbound Flow (ΔLon > 0)
Footpath Boundary Check:
Clear (Inside Road Envelope)
Rickshaw Kinematics & Direction Vector
Real-TimeN
E
S
W
89.5°
EASTBOUND
Instantaneous Speed:
24.0 km/h
Road Centerline Dist:
+0.4 m
Distance to Pedestrian:
142.5 m (Safe)
North Sidewalk Curb:
19.8 m to curb
SQLite Database Activity & Violation Stream
â SQLite Connected