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High-precision high-resolution radar sensor and radar echo signal processing method

A radar sensor, high-resolution technology, applied in instruments, radio wave measurement systems, radio wave reflection/re-radiation, etc., can solve the problem of difficult to achieve high precision and high resolution, optimize signal processing algorithms, and work Limited bandwidth and other issues, to achieve the effect of improving accuracy and resolution, strong environmental adaptability, and reducing power consumption

Inactive Publication Date: 2020-03-27
长沙瑞感电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing ranging technology solutions are generally difficult to achieve high precision and high resolution. The main reason is that the working bandwidth is limited, and it is difficult to optimize the signal processing algorithm. At the same time, it is even more difficult to consider the miniaturization and power consumption of the sensor.

Method used

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  • High-precision high-resolution radar sensor and radar echo signal processing method
  • High-precision high-resolution radar sensor and radar echo signal processing method
  • High-precision high-resolution radar sensor and radar echo signal processing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055]This embodiment provides a high-precision and high-resolution radar sensor, including a millimeter-wave ultra-wideband antenna, a millimeter-wave transceiver chip, and a signal processing chip. The millimeter-wave ultra-wideband antenna has the characteristics of miniaturization and integration and ultra-wideband, improves the signal-to-noise ratio, and improves the ranging accuracy and resolution; the millimeter-wave transceiver chip is highly integrated and works in the ultra-wideband state, so that the entire sensor has Miniaturization, low power consumption characteristics. The signal processing chip is highly integrated with a high-performance computing chip, which can quickly complete the calculation and consume less power consumption.

[0056] The millimeter-wave ultra-wideband antenna includes a transmitting antenna and a receiving antenna, and a MIMO millimeter-wave microstrip array antenna is used. The working frequency band of the millimeter-wave ultra-wideban...

Embodiment 2

[0061] This embodiment provides a radar echo signal processing method, which is used to further describe the signal processing chip.

[0062] The signal processing method is divided into two parts, A and B. The A part completes the rough spectrum calculation, and the B part realizes the spectrum refinement algorithm.

[0063] Include the following steps:

[0064] Step 1.1 roughly calculate the frequency spectrum of the intermediate frequency signal to obtain the frequency value of the rough spectrum peak, and use the frequency value of the rough spectrum peak to obtain the spectrum of the rough spectrum position;

[0065] Step 1.1.1 Since the frequency spectrum obtained after performing the Fast Fourier Transform (FFT) will have spectrum leakage, it is necessary to perform window filtering on the intermediate frequency signal to obtain the filtered output signal , the formula used is:

[0066] (7),

[0067] in, Indicates the input signal, represents the window funct...

Embodiment 3

[0102] Based on Embodiment 1 and Embodiment 2, this embodiment provides a method of using a radar sensor for distance testing, such as figure 2 As shown, the radar sensor is aimed at the stationary reflector, and a long-term statistical test is performed, and the test distance value in a long time period is counted, and the probability distribution of the distance value falling in other distance values ​​is analyzed. During the test period, the distance from the radar sensor to the stationary object is constant, and the accuracy of the distance value can be judged by the long-term statistical distribution of the distance value. Such as image 3 As shown in , it is the distribution diagram of the test distance value in a long period of time, Figure 4 It is a graph of the actual distance measured by the sensor as a function of time. combine image 3 Figure 4 , indicating that the present invention has high precision and low error probability.

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Abstract

The invention discloses a high-precision high-resolution radar sensor and a radar echo signal processing method, and belongs to the technical field of radar ranging. A transmitting chip transmits ultra-wideband millimeter-scale electromagnetic waves to a target through a transmitting antenna; the target reflects the electromagnetic wave to form an echo signal; a receiving chip receives the echo signal through a receiving antenna to generate an intermediate frequency signal; and a signal processing chip performs frequency spectrum rough calculation and frequency spectrum refinement processing on the intermediate frequency signal to obtain a target distance. While the antenna bandwidth is increased, the signal to noise ratio of signals is improved through the signal processing chip and the signal processing method, the ranging precision and resolution of the radar sensor are improved, the ranging precision reaches 0.1 mm, and the ranging resolution reaches 1 mm.

Description

technical field [0001] The invention relates to the technical field of radar ranging, in particular to a high-precision and high-resolution radar sensor and a radar echo signal processing method. Background technique [0002] The general principle of radar ranging is to use frequency-modulated continuous wave signal FMCW to measure distance. Generally, a send-and-receive antenna is used to transmit the FMCW signal to the target, the target reflects, the receiving antenna receives the echo signal, and the signal processing unit analyzes the echo signal to measure the radar arrival. The distance to the target. Existing ranging technology solutions are generally difficult to achieve high precision and high resolution. The main reason is that the working bandwidth is limited, and it is difficult to optimize the signal processing algorithm. At the same time, it is even more difficult to consider the miniaturization and power consumption of the sensor. Contents of the invention ...

Claims

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Application Information

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IPC IPC(8): G01S13/08
CPCG01S13/08
Inventor 龚亚军
Owner 长沙瑞感电子科技有限公司
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