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Measurement method of continuous frequency-modulated wave-system radar water level gauge

A technology of radar water level gauge and measurement method, which is applied in the direction of radio wave measurement system, measurement device, liquid/fluid solid measurement, etc., can solve the problem of affecting the accuracy and stability of large-range water level measurement, and cannot meet the requirements of large-range and large-variation water level measurement Accuracy and stability requirements and other issues, to achieve the effect of low power consumption, high precision and high stability

Active Publication Date: 2017-06-13
NANJING AUTOMATION INST OF WATER CONSERVANCY & HYDROLOGY MINIST OF WATER RESOURCES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of transmission power, it is impossible to obtain large time width and bandwidth at the same time. When measuring water level with large range and large water level variability, since the reflected signal becomes very weak, the phase information will be submerged in noise, affecting a large number of The measurement accuracy and stability of water level in different ranges, the measurement accuracy is mostly 1.0cm or 2.0cm, which cannot meet the accuracy and stability requirements of large range and large variable amplitude water level measurement

Method used

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  • Measurement method of continuous frequency-modulated wave-system radar water level gauge
  • Measurement method of continuous frequency-modulated wave-system radar water level gauge
  • Measurement method of continuous frequency-modulated wave-system radar water level gauge

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Embodiment 1

[0037] Such as figure 1 As shown, the hardware design of the present invention's continuous frequency modulation radar water level gauge measurement is as follows:

[0038] It mainly includes a main control module, a radar modulation wave transmitting module, a two-way radar signal receiving module and its automatic gain control module, and a planar microstrip antenna.

[0039] The radar modulated wave transmitting module includes (DDS) triangular wave generator, (MOD) modulator, (VCO) voltage controlled oscillator and (DISP) circulator connected in sequence; the radar signal receiving module includes (MIX) high frequency mixer connected in sequence frequency converter, (AMP) primary amplifier, (LPF) low-pass filter, (AMP) secondary amplifier and A / D converter; the main control module adopts TMS320F28M35 dual-core processor, including DSP processor, CPU processor, FPU Floating-point arithmetic unit, program memory FLASH and RAM memory.

[0040] The main control module is con...

Embodiment 2

[0045] The principle of radar positioning is as figure 2 As shown, the dark line of the F coordinate indicates the triangular wave transmitting signal, and the light color line indicates the intermediate frequency receiving signal after the receiver detects; F b The coordinates represent the sending and receiving difference frequency signal. It can be seen that due to the existence of radio frequency propagation delay, there is a frequency difference F between the sending and receiving frequencies. b , this frequency value changes proportionally to the target distance;

[0046] if use f bup expressed in figure 2 The frequency difference between sending and receiving radar signals in the rising section of the medium triangular wave sweep (referred to as the upper sweep frequency difference), f bdown express figure 2 The frequency difference between the transmitting and receiving radio frequency in the descending section of the triangular wave sweep (abbreviated as the fr...

Embodiment 3

[0053] Such as image 3 Shown, the continuous frequency modulation wave system radar water level gauge measuring method of the present invention, this water level gauge mainly comprises main control module, radar modulated wave transmitting module, radar signal receiving module, automatic gain control module and planar microstrip antenna, the main steps of this method as follows:

[0054] Step 1), before the actual water level measurement of the main control module, first call the automatic gain control module (this module can be realized by software), set the number of times (time) and the pace of tracking according to the optimal principle and real-time requirements, and output Digital gain scale factor; control the gain of the first-stage and second-stage amplifiers of the two receiving channels, so that the echo signal is small, and the gain is increased; when the signal is large, the gain is reduced; the signal is maintained in a wide range to work in the op amp The line...

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Abstract

The invention discloses a measurement method of a continuous frequency-modulated wave-system radar water level gauge. Measurement of a water level under conditions of a large measuring range and high variability is realized by combining a Chirp-Z+FFT method with an automatic gain control method, and the continuous frequency-modulated wave-system radar water level gauge measurement method has the characteristics of high precision, high stability, low power consumption, high interference resistance, high repetitiveness and the like. The continuous frequency-modulated wave-system radar water level gauge can be independently used as a sensor for high-precision water level measurement, and also combined with an acquisition terminal to form an intelligent integrated monitoring device, so as to realize water level prewarning and unattended automatic water level monitoring.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of liquid level observation, and relates to a method for measuring a radar water level gauge with a continuous frequency modulation wave system. [0003] Background technique: [0004] At present, domestic radar water level gauges for large range and large variable rate water level measurement mainly rely on imports, mainly German brands, and are expensive. Domestic radar water level gauges are mostly refitted from industrial level gauges. The main method used is the pulse radar system, which uses the time difference method to achieve water level measurement. According to modern radar theory, the resolution of radar ranging is proportional to the bandwidth or time width of the transmitted signal. Due to the limitation of transmission power, it is impossible to obtain large time width and bandwidth at the same time. When measuring water level with large range and large water level variability, because...

Claims

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Application Information

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IPC IPC(8): G01F23/284G01S13/88
CPCG01F23/284G01S13/88
Inventor 周冬生宗军张恒周密姚刚裘劲松蒋东进曹子聪
Owner NANJING AUTOMATION INST OF WATER CONSERVANCY & HYDROLOGY MINIST OF WATER RESOURCES
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