Police car dynamic speed measurement scheme

The police car dynamically detects the speed of the rear vehicle during driving, detects the speeding vehicle, and automatically triggers the camera to capture the license plate of the speeding vehicle.

System principle
Rear vehicle speed = police car speed + rear vehicle speed detected by radar
System software integration: According to the above principle, the radar control board as the main control equipment, its own speed collection, rear vehicle speed collection, the system calculates, real-time judgment of the rear vehicle speed, when the rear car is found to be overspeeding, drive the LED screen for display and warning, and trigger the capture camera through the switch and other interfaces to capture, trigger the horn warning!

1. Police car speed collection
The police car is also a kind of vehicle, and its own speed can be collected through the OBD interface of the police car.

2. Rear vehicle speed acquisition: multi-lane traffic flow detection radar (certified product of the Ministry of Public Security)

Multi-lane traffic flow microwave detection radar is a new type of microwave vehicle detector with completely independent intellectual property rights, using the principle of radar chirp technology, transmitting microwaves on the road surface, through high-speed real-time digital processing and analysis of echo signals, detecting the traffic, speed, lane occupancy, traffic capacity, congestion index and other traffic flow information of each lane non-contact traffic detector.

This radar is mainly used in the collection of traffic parameters of highways, urban expressways, ordinary highway traffic flow survey stations and bridges, providing accurate, reliable and real-time traffic information for traffic management and providing technical support for the realization of traffic intelligence.

Basic parameters of microwave radar
A. Center frequency: 80GHz;
B. Modulation mode: FMCW;
C. Ranging range: 1m~300m (long-distance mode), 1m~70m (short-range mode);
D. Ranging accuracy: ±0.3m;
E. Speed measurement range: -200km/h ~ +300km/h;
F. Speed measurement accuracy: ±0.5km/h;
G. Pitch angle beam: ±7°
H. Horizontal angle beam: ±18° (long-range mode), ±45° (short-range mode)

3. Display part
The display part is made of P10 two-color high-brightness LED display, the area is according to the width of the rear door of the police car, the size example: 1280*640MM.

4. Overall plan: system integration
The diagram of the hardware integration system is as follows:

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