JINWEI HIRAIN SRR520 Short-Range Ranging Sensor Instruction Manual
- June 12, 2024
- JINWEI HIRAIN
Table of Contents
JINWEI HIRAIN SRR520 Short-Range Ranging Sensor
Introduction
Purpose
This document introduces the Rear short-range ranging sensor (SRR) that designed and manufactured by Beijing Jinwei Hirain Technologies Co., Inc.
Scope
This document is used for reference only to the Rear short-range ranging sensor customers of Beijing Jinwei Hirain Technologies Co., Inc.
Terminology
SRR: Rear short-range ranging sensor
BSD: Blind Spot Detection
RCTA: Rear Cross Traffic Alert
DOW: Door Open Warning
RCW: Rear Collision Warning
Product
Rear short-range ranging sensor is installed right in the side of the vehicle, intended to detect, measure, track and identify obstacles in the target region. SRR mainly supports the functions of BSD、RCTA、FCTA、DOW、LCA for ADAS with L2 and above.
Radar Principle
SRR520 uses the pulse doppler (PD) scheme as basic principle for its measurements. Compared with frequency modulated continuous wave (FMCW), it avoids the serious coupling between range and doppler domains, because these are mapped to a 2-dimensional frequency range by two succeeding fast Fourier transformations (FFTs), that are calculated in the processing unit of the sensor.
Antennas
SRR520 uses 3 Tx antennas and 4 Rx antennas to radiate the microwave signals generated by radio frequency (RF) chip into the air and receive echoes reflected by targets. The gain is 16dBi for both antennas and 13dBi for single antennas
FOV
FIG. 1 shows the beam coverage area of passenger car after the Rear short-
range ranging sensor.
Parameters
Table 1 Performance index of Rear short-range ranging sensor system
| Parameters | Value |
|---|
System Characteristics
Frequency| 76~77 GHz
Operating voltage| 9V~16V
Weight| 120g
Update Rate| 50ms
Functional Safety Level| ASIL B
Range
(Range-Azimuth Plane)| ±75°
Range| 0.5~100m
Velocity| -110 m/s ~50 m/s
Elevation| ±10°
Target Detection Ability
| 500h
Multi-Objects Discrimination Ability
Range Resolution| < 0.4 m
Velocity Resolution| < 0.14m/s
Angular Resolution| < 7°
Parameter Precision
Range Precision| < 0.1 m
Velocity Precision| < 0.05 m/s
Azimuth Precision| < 1°
Output Number of Tracking Targets| 64
Output Number of Point Cloud (Optional)| <=200
transmitted power| < 33.9dBm
Power Consumption| < 5W
Nominal Voltage| 12V
Operating Temperature| -40~ 85 ℃
Storage Temperature| -40~ 105 ℃
International Protection| IP6K9K
Interface| 2xCAN/CAN-FD，1xEthernet
Geometric Structure
Rear short-range ranging sensor size is: 70mm 65mm 31mm ( with connector
Model No. of Harness Connector
Table 2 Model No. of Harness Connector
| Connector Type | Model No. | Supplier |
|---|---|---|
| 12 Pin Connector | 6189-8374 | Sumitomo |
| Terminal | 6188-6387 | Sumitomo |
Pin Definition of the Connector
Table 3 gives the measured pin value of the SRR operating in 12 Voltages.
1| N.C|
---|---|---
2| POS1|
3| CAN1_L| CAN1
4| CAN2_L| CAN2
5| POS2/ High Side Driver1|
6| POWER|
7| N.C|
8| GND|
9| CAN1_H| CAN1
10| CAN2_H| CAN2
11| IGN/High Side Driver2|
12| High Side Driver3|
Label
FCC ID: 2A7MKSRR520
Label size： 30mm*20mm
Software version number： sw.1.00.00；
hardware version number： hw.1.00.00 IP6K9K
Radar function
BSD
The function is defined as real-time monitoring of the driver’s visual field blind area and warning information when other road users appear in the specified blind area.
The main function of the blind area monitoring system is to monitor other traffic participants in the blind area of the driver’s visual field, and to give early warning to the driver. The blind spot monitoring function covers adjacent areas on the left and right sides, and the target vehicles are ordinary mass-produced vehicles or motorcycles. System functions are realized by judging the following information:
- The relative distance between the car and other traffic participants;
- The relative speed of the car and other traffic participants;
- Whether other traffic participants are located in the blind area monitoring range.
DOW
The function definition is to monitor the rear of the vehicle which may endanger the safety when the door is about to be opened in the parking state, and to issue warning information when the risk of collision may occur due to the door opening.
The door opening reminder system has an alarm function. If there is a risk of collision with other traffic participants when the driver and passenger open the door,the system will send an alarm to the driver and passenger. System functions are realized by judging the following information:
- Vehicle speed
- The relative speed between the car and other traffic participants
- Whether other traffic participants are located in the DOW alarm area
- The relative distance between the car and other traffic participants Based on the above information, an alarm is issued to the driver and passenger according to the risk of collision.
RCTA
The function is defined as monitoring the situation that may endanger the safety in the rear lateral of the vehicle under the state of reversing, and issuing warning information when the risk of collision may occur.
The main function of the vehicle rear lateral traffic warning system is to send an alarm to the driver when there is potential conflict danger between the vehicle and the vehicle. System functions are realized by judging the following information:
- The relative distance between the car and the coming car;
- The relative speed between the car and the car;
- Whether the autonomous vehicle is located on the front track of the incoming vehicle. Based on the above information, the controller sends an alarm to the driver according to the degree of driving danger.
MANUFACTURER INFORMATION
Manufacturer：Beijing Jingwei Hirain Technologies Co., Inc.
Mailing Address：4F, Block 1, No.14 Jiuxianqiao Road, Chaoyang District,
Beijing, P.R.China
NOTICE
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
To maintain compliance with the RF exposure requirement, a separation distance of 20 cm between the device and the human should be maintained.
Beijing Jinwei Hirain Technologies Co., Inc.
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