Component description for bumper radar sensors - GF30.30-P-3302RF

Model 205, 253 with code 22P (Lane tracking package)

Model 205, 253 with code 23P (Driving Assistance package Plus)

Shown on a disassembled front bumper (inner view), model 205.0

Fig 1: Identifying Bumper Radar Sensors Components - Shown On Model 205.0

Courtesy of MERCEDES-BENZ USA

Shown on a disassembled rear bumper (inner view), model 205.0

Fig 2: Identifying Bumper Radar Sensors Components - Shown On Model 205.0

Courtesy of MERCEDES-BENZ USA

Location

Front:

The front bumper radar sensors are inserted into the inner side at the left and right respectively into the front bumper.

Rear:

The left rear bumper radar sensor, right rear bumper radar sensor, integrated outer left rear bumper radar sensor and the integrated outer right rear bumper radar sensor are inserted from the inside into the rear bumper on the corresponding side. The center rear bumper radar sensor is inserted centrally on the inside into the rear bumper.

Task

The following radar sensors (short range sensors) recognize objects (e.g. vehicles) in the short range up to s = 30 m for a maximum detection angle of ∠= 130°:

Left front bumper radar sensor
Right front bumper radar sensor
Left outer rear bumper radar sensor
Left outer rear bumper integrated radar sensor
Right outer rear bumper radar sensor
Right outer rear bumper integrated radar sensor

The center rear bumper radar sensor recognizes objects (vehicles in rear) up to s = 80 m (mid-range area) for a maximum detection angle of ∠ = 18°.

Body

Front and rear bumper radar sensor (short range sensor), except center rear bumper radar sensor:

The radar sensors are ultra wideband radar sensors with the following properties:

Radar sensor detection range: s = 0.18 to 30 m, at a resolution of s = 0.04 m
Detection angle: = 80° with angle measurement and ∠ = 130° only detection (tracking)
Carrier frequency: f = 25 GHz
Method of operation: Short pulse method with f = 1.4 GHz band width (frequency band width f = 24.25 to 25.65 GHz)

The coding (differentiation) for the individual radar sensors takes place by means of appropriate assignment with circuit 31 on pin 5 and 6.

The high band width of the radar sensors allows a very precise position statement to be made and optimizes separation of objects lying close to each other.

Center rear bumper radar sensor:

The center rear bumper radar sensor operates based on the pulse Doppler principle with the following properties:

Radar sensor detection range: s = 0.18 to 80 m at a resolution of s = 0.5 m (in the short-range area: s = 0.18 to 30 m at a resolution of s = 0.04 m)
Detection angle: ∠ = 18° 8° (in the short-range area: = 80° with angle measurement and =130° only detection (tracking))
Carrier frequency: f = 25 GHz

The integrated outer right rear bumper radar sensor and the integrated outer left rear bumper radar sensor operate based on the master/slave principle. The master or slave function can be determined via the connector coding. The master function is defined for the integrated right rear bumper radar sensor. In other words, the integrated left rear bumper radar sensor sends its information via the periphery CAN to the integrated right rear bumper radar sensor which evaluates the corresponding information from both integrated rear bumper radar sensors and sends corresponding requests or data via periphery CAN to the corresponding control units.

The left front bumper radar sensor, right front bumper radar sensor, outer left rear bumper radar sensor, outer right rear bumper radar sensor and center rear bumper radar sensor are actuated and evaluated by the radar sensors control unit (N62/1). The signal transmission of the radar sensors to the radar sensors control unit is via the following CAN connections:

Radar CAN 1 (CAN S1)
Radar CAN 2 (CAN S2)

Radar CAN 1

The radar sensors control units communicates with the following radar sensors via radar CAN 1:

Left front bumper radar sensor
Right front bumper radar sensor

Radar CAN 2

The radar sensors control units communicates with the following radar sensors via radar CAN 2:

Left outer rear bumper radar sensor
Right outer rear bumper radar sensor
Center rear bumper radar sensor

Blind Spot Assist wiring diagram	PE54.71-P-2100-97FBA
Radar sensors control unit wiring diagram	PE30.30-P-2102-97FBA