Microwave distance measuring device based on relative sampling

Abstract

The invention discloses a microwave distance measuring device based on relative sampling, and relates to a microwave distance measuring device. The invention provides a microwave distance measuring device based on relative sampling, which has the advantages of simple structure, high precision and low cost. The device is provided with a frequency control module, a microwave module and a signal processing module, wherein the frequency control module is provided with a main clock signal generator, a main path pulse forming circuit, a sampling clock signal generator and a sampling pulse forming circuit; the microwave module is provided with a local oscillator, a main path switch, a sampling switch, a power amplifier, a low noise amplifier, a filter, a coupler, a transmitting frequency mixer, a receiving frequency mixer and an antenna; and the signal processing module is provided with a transmitting peak value detector, a receiving peak value detector, an OR gate circuit, a microcontrollerand a display. By the sampling signal, of which the period is nearly equal to that of the receiving signal, the relation-based sampling of the transmitting signal and the receiving signal is carried out, so that the expansion of the time difference between the transmitting signal and the receiving signal on the time domain is realized, and the highly precise object distance measurement is achieved.

Description

technical field [0001] The invention relates to a microwave distance measuring device, in particular to a microwave distance measuring device based on correlation sampling. It mainly solves the problem that the echo time of pulse radar is short and difficult to measure accurately, so as to realize high-precision, non-contact microwave-based distance measurement. Background technique [0002] Short-range microwave ranging technology is a small radar technology with a detection distance ranging from a few tenths of meters to several hundred meters. It is widely used in industry and commerce, especially suitable for automatic parking, industrial production monitoring and liquid level in tanks. Measurement etc. (1.Wolfgang Weidmann.A high resolution radar for short range automotive application.28 th European Microwave Conference Amsterdam 1998). [0003] The microwave ranging device transmits a microwave signal through the antenna, and when it meets the target to be measured,...

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Problems solved by technology

However, in this way, the switching speed needs to be at the ps level to realize the sampling of the pulse to the transmitted wave and the echo, which is difficult to implement and the cost is high.

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