NANORADAR SP25 Millimeter Wave Radar Sensor User Manual
- June 4, 2024
- NANORADAR
Table of Contents
NANORADAR SP25 Millimeter Wave Radar Sensor
White paper on SP25 millimeter wave radar
Abstract: SP25 is K-band radar sensor developed by Nanoradar. It has the
advantages of being small size, high sensitivity, lightweight, easy to
integrate, cost efficient and stable performances. And it has the function of
range-measurement and collision avoidance. Now it is widely applied in the
UAVs, industrial machinery, intelligent lighting, robots, hydrologic
monitoring and railway vehicle safety etc.
Key words: SP25, small size, millimeter wave radar, cost efficient
Introduction about mmw radar
What is mmw radar?
Millimeter-wave radar is an electronic device that senses objects by transmitting and receiving microwaves. The millimeter wave has a wavelength between the centimeter wave and the light wave. Compared with the centimeter wave sensor, the millimeter wave sensor has the characteristics of small volume, light weight and high spatial resolution. While Compared with infrared, laser, TV and other optical sensors, millimeter wave sensor can penetrate through the smoke, fog, dust and strong, with all-weather (except for heavy rainy days) and all-day characteristics. Moreover, its capability of anti-jamming and anti-stealth is better than that of other sensors.
The development history of mmw radar
In 1842, the Austrian physicist Doppler (Doppler, Christian Johann) found the
Doppler effect of electromagnetic waves. Nearly two hundred years, people have
been adopting Doppler Effect in radar operation. Thanks to the development of
electronic science, great progress has been made in radar field. And K-band
24GHz radar is one of the mainstream products in the civil field, which is a
global radar operating frequency range specified by ISM. The frequency range
of the electromagnetic wave is 24.00-24.25GHz.
In Europe and the United States, the use of 24GHz anti-collision radar
products in automotive is already very common. This makes radar be the
mainstream detection method in the ACC cruise system, car blind spot detection
system and automotive collision avoidance system. Relevant laws and
regulations have also been introduced to guide the 24GHz radar for vehicle
detection and industrial anti-collision.
Hunan Nanoradar Science and Technology Co., Ltd. set about the R&D of 24GHz
millimeter wave radar sensor earlier. Therefore it has mature solutions of
millimeter wave radar sensor system.
Product overview
Product features
SP25 is a lightweight and compact radar sensor in the same industry, which
utilizes radar wave to efficiently measure the distance and velocity of
targets.
It has the lowest power consumption(0.5W) in the same industry, the smallest
volume(40mm31mm6mm), a distance-measurement of 30m and the advantages of
advanced performances, high cost efficient and integrated peripheral
interfaces. And now it has been one of the best 24GHz radar sensors, and has
set up a new standard in obstacle avoidance and range measurement.
UART interface default rate of Board-level communications is 115200bit / s, and the target refresh rate of 50Hz. With universal external interface, you can quickly integrate with the host computer or other MCU, which saves the user’s configuration time.
Product specifications
SP25 is a K-band millimeter wave radar sensor system, using a higher complexity of the FMCW modulation mode. It can detect the distance and velocity of moving objects, and has a high range and velocity measurement accuracy.
SP25 adopts one-way transmitting antenna and one-way receiving antenna, and the transmitting and receiving antenna is separated. Therefore, the radar transmitting and receiving link higher isolation. Besides, the radio frequency MMIC is coplanar with the antenna, which can reduce the loss of radio frequency link. The low side lobe synthesis of the antenna by using Taylor algorithm has a better suppression ratio than -15dB side lobe, which makes that SP25 is not susceptible to the interference of ground moving targets, and can improve the radar detection performance.
Table 1 SP25 specifications
| PARAMETER | CONDITIONS | MIN | TYP | MAX | UNITS |
|---|
System characteristics
Transmit frequency| | 24.00| | 24.20| GHz
Output power（EIRP）| | | 12| | dBm
Modulation type| | FMCW|
Update rate| | | 50| | Hz
Range-measurement & velocity -measurement
Range-measurement range| @0 dBsm| 0.1| | 30| m
Velocity-measurement range| | -70| | 70| m/s
Range-measurement accuracy| | | ±0.1| | m
Velocity-measurement accuracy| | | 1.2| | m/s
Multi-target tracking
No. of simultaneously tracked
targets
| | | 1| | pcs
Distance resolution| | | 0.75| | m
Velocity resolution| | | 2.4| | m/s
Antenna performances
Beam width
| Azimuth(-6dB)| | 100| | deg
Elevation(-6dB)| | 38| | deg
Side lobe level
| Azimuth| | | |
Elevation| | -15| -16| dB
Other characteristics
Supply voltage| | 4| 5| 6| V DC
Supply current| @5V/25℃| 90| 100| 110| mA
Storage temperature| | -60| | 125| ℃
Operating temperature| | -40| | 85| ℃
Dimensions| | | 4| | g
Size| | 40x31x6(LWH)| mm
Applications
- Range-measurement and anti-collision for railway vehicles
- Range-measurement and anti-collision for robots
- Range-measurement and anti-collision for UAVs
- Intelligent radar lighting-control system
- Range-measurement and anti-collision for machineries
- Range-measurement and anti-collision for hydrological monitoring ships
- Radar and video fusion alarm system
Typical application examples
Automatic collision avoidance for UAVs
In recent years, with the increasing demand of UAV market, a large number of
unmanned aerial vehicles encountered flying obstacles in the air, resulting in
the occurrence of flight difficulties, as shown in Figure 3. Thus collision
avoidance has been one of the key challenges in restricting the development of
unmanned aerial vehicles. Millimeter-wave radar can detect five times as far
as that of ultrasonic. Moreover, due to its high frequency and anti-
interference ability, it has become the standard accessories in UAV.
Furthermore, millimeter-wave radar has the advantages of being small size,
high resolution and low power consumption, which could fully meet UAV’s
demanding requirements about the size and power consumption. SP25 is an ideal
choice for the personal aerial photography unmanned aerial vehicles and other
consumer-level UAV in low-altitude operation.
The installation location for SP25 is flexible, which is applicable to various
types of UAV platform, directly connecting to the unmanned aircraft flight
control system through the UART serial port. At the same time, according to
the application needs, by installing one or more modules, it can extend the
flight detection perspective, radiate low-power electromagnetic beam to the
surrounding, and capture the echo signal to calculate the obstacle distance.
Therefore it can guide the UAV flight control system to quickly make
adjustments to the direction of flight. When the distance is beyond safety,
the collision avoidance system (sensing-avoidance system) can basically
replace the operator to complete the relevant calculations, and automatically
trigger to avoid other aircraft movements.
The advantages of SP25 in UAV collision avoidance:
- Low cost and low power consumption;
- Small size and light weight;
- Accurate and stable detection of obstacles;
- Long distance measurement and strong anti-interference ability.
Intelligent radar lighting control system
Intelligent lighting system can be used as the core subsystem of the smart
city, utilizing wireless Zigbee, GPRS and other Internet of Things and IT
technology, millimeter-wave radar sensor technology. It can be used for remote
single lamp switch, dimming, detection and other control functions, and can
percept the road traffic flow information in real time, which has opened up a
new chapter for the city lighting “management of energy saves”. But at the
same time energy-saving is also an imminent problem. In various cities energy-
saving requirements have been put forward, looking forward to make adjustments
in lighting control.
There exist the following problems in the market’s existing intelligent
lighting control system:
- The control stratagem of setting different brightness in different time has poor adaptability to the environment, and therefore the energy-saving degree is limited;
- High cost and difficult to maintain in the using the traditional way of power line carrier communication.
In order to solve the problem of street lamp control system, SP25 millimeter
wave radar is used as the intelligent sensing module, and the radar sensor
detects whether there are pedestrians and vehicles passing through the road to
give the lighting strategy to realize the intelligent control of the street
lamp.
A radar sensor could provide the distance and velocity of targets for 3 to 5 lights. And the detection data is transmitted through the light control system.
Energy saving ways：
- 19:00-1:00，with more vehicles and people，the average power is70%；
- 1:00-5:00，with less vehicles and people, the average power is 20%.
For the120W LED street lighting system using nanoradar’s intelligent lighting control sensor, the average power could be reduced 50% (in accordance with 1 RMB / KWh),and therefore 100,000 lights per year can save the cost of about 18.25 million RMB yuan. It can make great contributions to the intelligent city construction and reasonable energy savings.
The advantages of SP25 in intelligent lighting：
- Easy to maintain;
- Good in energy saving;
- Low cost and easy to integrate.
Conclusion
SP25 is a cost-effective millimeter-wave radar sensor aiming at collision avoidance in short range. It can meets the rapidly growing demands of industrial control, unmanned aerial vehicles, smart lighting, security, sports and related fields. Different from our well-known short-range infrared sensors, it utilized a low-power electromagnetic wave for the detection of targets; therefore it is completely harmless to the human body. At the same time, we provide excellent after-sales service, detailed manual, to help you solve the difficulties in use.
Hunan Nanoradar Science and Technology Co., Ltd.
No.27 Wenxuan Road, Hi-tech District Changsha
B7 Lugu Compark
Tel: 0731-88939916
E-Mail: sales@nanoradar.cn
URL：www.nanoradar.cn
FCC Caution
This device complies with part 15 of the FCC Rules. Operation is subject to
the following two conditions: (1) This device may not cause harmful
interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
Any Changes or modifications not expressly approved by the party responsible
for compliance could void the user’s authority to operate the equipment.
Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.