Geomagnetic parking sensor

Introduction of NB IoT the third mock examination geomagnetic vehicle detector

XDN-P-DC-A3 the third mock examination geomagnetic vehicle detector is an intelligent parking space detector specially designed for roadside parking and intelligent garage. Based on the fusion algorithm of dual geomagnetic sensors, a radar detection device is added, which breaks through the limitations of dual geomagnetic sensors on interference and sensitivity, and improves the detection accuracy to more than 99.5%.

XDN-P-DC-A3 can directly output the “presence/absence” judgment of parking spaces and vehicles. It is convenient and flexible to input and output through serial port, and has multiple debugging instructions, making it easy to integrate into various parking systems. It also comes with temperature compensation function, which can be used in most indoor and outdoor environments. The embedded detection algorithm has high stability, good accuracy, and can be upgraded wirelessly, making subsequent maintenance convenient.

1. The battery can be replaced independently without the need for overall scrapping, improving the efficiency of geomagnetic use.
2. The battery life can reach up to 5 years. Exceeding the endurance of most geomagnetic vehicles on the market.
3.Compared to ordinary microwave dual-mode geomagnetism, the accuracy of parking detection is significantly improved.

 

1.1 Product Features

(1) Parking status detection: Suitable for serial and parallel parking vehicle detection.

(2) The third mock examination geomagnetic detection: using two geomagnetic sensor chips and radar detection, the magnetic field orientation can be judged, and the detection accuracy is ≥ 99.5%

(3) Strong magnetic interference detection: General strong magnetic interference does not affect detection judgment.

(4) Automatic temperature compensation: automatically compensates for detection deviations caused by temperature.

(5) Equipment self inspection and alarm: The equipment conducts regular self inspection and can automatically alarm for abnormalities.

(6) Low power coordinated control: adopting a low-power mechanism to extend the battery life of the detector.

(7) Device activation: The detector’s geomagnetic detection and other functions are turned off before leaving the factory, and the device is activated through a WeChat mini program after installation.

(8) Algorithm reset and state reversal: When the algorithm encounters problems, it can be reset or state reversed through instructions. The algorithm itself can also self correct as the vehicle enters and exits, and errors are not easy to accumulate

(9) Long service life: can work for more than 3 years without the need for battery replacement, with a maximum service life of 5-7 years.

(10) Easy to maintain: The shell has an inner liner, which is easy to disassemble. When the battery needs to be replaced, it can be easily replaced.

(11) Product structure: The shell has an inner liner and is made of three layers of waterproof material. It can be easily folded and replaced with spare parts when using special tools

(12) Power off mode: Exit in sleep mode, requires activation by a professional WeChat mini program

(13) Remote configuration: remotely perform parameter function changes, timing, and restart functions on the device;

(14) Remote monitoring: can monitor the working status, voltage, temperature, and wireless network signal strength of the detector;

(15) Water resistant cover: The product works normally when the water depth is less than 20cm

(16) Anti interference performance: Passed the power frequency magnetic field immunity test (GB/T17626.8-2006) and the electrostatic discharge reactance interference test (GB/T176262-2018), and the evaluation level meets the A-level or above standard

(17) Heartbeat interval: 1-240min (adjustable)

(18) Response time for parking space status detection: When speaking and leaving the parking space, the geomagnetic detection time should not exceed 1.5 seconds. The time for detecting the car to stop or leave and transmitting it to the handheld device should not exceed 5 seconds

(19) Data reporting function: The data is sent to the operator’s base station through the NB IoT module and reported to the server through the base station. No need for data gateway forwarding in the middle, data is directly sent through NB loT technology

(20) Self learning function: The device can autonomously complete initialization, sensor reset, and adapt to magnetic field changes without the need for human intervention. Equipped with equipment fault self inspection, chip with temperature difference compensation algorithm adaptive optimization function, self inspection and software module remote control upgrade function.

 

1.2 Main technical parameters

NB the third mock examination geomagnetic vehicle detector adopts dual geomagnetic and radar dual calibration mechanism, uses a compression resistant and waterproof double shell, which can withstand a pressure of more than 30T, and the overall sealing of the product meets IP68 standard; NB IoT wireless communication technology, which can be updated with BLE firmware; The inner and outer liner structure is easy to install and maintain, and the battery can be replaced; NB-IOT data is transmitted through the operator’s IoT platform.
Main performance parameters:

NB IoT: (corresponding to the three major operator frequency bands) B1, B3, B5, B8, B20, B28

Working frequency: 2100MHz, 1800MHz, 850MHz, 900MHz, 800MHz, 700MHz (mainly determined based on communication modules, may vary slightly)

Temperature: -40~+80 ℃ (working), -40~+85 ℃ (storage).

Power supply: 3.6V ≥ 38Ah lithium sulfite chloride battery

Maximum battery life: 5-7 years (based on the frequency of 12 parking trips per day, theoretically it should be greater than 5 years)

Detection method: geomagnetic+geomagnetic+radar

Accuracy: Over 99.5% in actual testing

NB maximum transmission power: ＜ 20dBm

NB receiving sensitivity: -129dBm

Reset method: reed or BLE

Shell material: inner and outer liner structure

Sealing performance: IP68

Program upgrade: BLE OTA

External dimensions: diameter: 110mm, height: 95mm, buried cylindrical body

Weight: 733g

 

1.3 Product technical advantages

The NB the third mock examination geomagnetic parking space detector uses two geomagnetic sensor chips and radar for dual vehicle detection. This detection method has the following advantages compared with the traditional parking space detection method:

Improve the success rate of parking detection, with an accuracy rate of ≥ 99.5%, higher than the accuracy of using only one geomagnetic sensor.

The geomagnetic sensor has extremely low power consumption and can operate for a long time before the battery runs out.

By using two geomagnetic sensors and radar detection to determine the direction of the magnetic field, mutual interference between adjacent parking spaces can be reduced.

When detecting the status of parking spaces, the algorithm does not absolutely rely on the geomagnetic background value, and compensates for the drift of magnetic field and working temperature background values.

The product is not affected by weather conditions such as rain, snow, fog, etc.

Self learning function: The device can autonomously complete initialization, sensor reset, and adapt to magnetic field changes without the need for human intervention. Equipped with equipment fault self inspection, chip with temperature difference compensation algorithm adaptive optimization function, self inspection and software module remote control upgrade function.

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