PCB Tech - What is PCB Doppler radar?

PCB Doppler radar is a radar that uses the Doppler effect to detect the position and relative speed of a moving target.

Working principle of PCB Doppler radar

When the radar emits a fixed-frequency pulse wave to scan the air, if it encounters a moving target, there is a frequency difference between the frequency of the echo and the frequency of the transmitted wave, which is called the Doppler frequency. According to the size of the Doppler frequency, the radial relative movement speed of the target relative to the radar can be measured; based on the time difference between the transmitted pulse and the received pulse, the distance of the target can be measured. At the same time, using the frequency filtering method to detect the Doppler spectrum of the target and filter out the interference noise spectrum can enable the radar to distinguish between the target signal and the strong noise. Therefore, Doppler radar has a stronger anti-clutter interference ability than ordinary radar and can detect moving targets hidden in the background.

PCB Doppler radar

Characteristics of PCB Doppler radar

One difference between Doppler radar and traditional radar is that its transmitter is always on. This type of radar is called continuous wave or CW radar. The reason why the transmitter must always be on is that unlike traditional radar, which needs to calculate the time between transmission and reception, Doppler radar looks for frequency changes. The frequency change will not last for a long time, so the transmitter must always be turned on.Doppler radar has the following characteristics:

1.The use of programmable signal processors improves the processing power, speed and flexibility of radar signals, improves the reusability of the equipment, and enables the radar to search while tracking, change or add the working state of the PCB radar. This allows the radar to handle various interferences and identify targets beyond the line of sight; 

2.Using programmable gated traveling wave tubes, the radar can operate at different pulse repetition rates and can adapt to the waveform. It can select waveforms with low, medium and high pulse repetition rates according to different tactical states, and achieve optimal performance under various working conditions; 

3. Using Doppler beam sharpening technology to achieve high resolution, it can provide high-resolution mapping and high-resolution local magnification mapping in air-to-ground applications. In air-to-air enemy situation judgment, it can distinguish group targets in dense formations.

The data used in radar PCB needs to have good high-frequency performance, good thermal stability, high mechanical strength, and good corrosion resistance.

The PCB Doppler radar is a key component in the radar system and has important functions and roles.

1. Design principles

The design principle of the radar PCB board is based on the working principle of the radar system, which detects the position and speed of the target object by receiving and sending electromagnetic waves. The radar PCB board needs to be designed according to the frequency, power and working mode requirements of the radar system to ensure stable signal transmission and accurate processing.

2. Signal processing function

The radar PCB board has a signal processing function that can process and analyze the received radar signal. Signal processing functions include signal filtering, target detection, parameter calculation and data display.

3. Performance requirements

The performance requirements of the radar PCB board directly affect the detection capability and accuracy of the radar system. The main performance requirements include frequency response, dynamic range, noise coefficient and power consumption.

PCB Doppler radar is widely used in military, aviation, aerospace, transportation, meteorology, and security. In the military field, radar PCBs are used for target detection, navigation, and communication, providing important tactical support. In the aerospace field, radar PCBs are used for aircraft navigation, obstacle avoidance, and target tracking to ensure flight safety. In the field of traffic and weather, radar PCB boards are used for vehicle and weather monitoring and early warning, providing important traffic and weather information. In the field of security, radar PCB boards are used for intrusion detection, border monitoring and target tracking to ensure safety and prevention.As an important component of the radar system, PCB cart radar has multiple functions such as design principles, signal processing functions, performance requirements, and application fields.