Method for improving ranging accuracy of ranging radar by virtue of TOF phase method

Abstract

The invention provides a method for improving the ranging accuracy of a ranging radar by virtue of a TOF phase method. The method comprises the following steps that a signal modulation unit drives a modulation frequency f1 to modulate signal light, and the ranging radar transmits the modulated signal light; a photosensitive element samples an echo signal; a signal processing unit calculates phase difference phi1 and converts the phase difference phi1 into distance D1 from an object; the signal modulation unit drives a modulation frequency f2 to modulate the signal light, and the ranging radar transmits the modulated signal light; the photosensitive element samples the echo signal; the signal processing unit calculates phase difference phi2 and converts the phase difference phi2 into distance D2 from the object, wherein the modulation frequency f1 is lower than the modulation frequency f2; and the signal processing unit obtains a corrected distance value D according to D1 and D2. The method provided by the invention has the advantage that under the conditions that the hardware is not changed and the cost is not increased, the ranging accuracy, especially middle and long distance accuracy, of the ranging radar by virtue of the TOF phase method is improved.

Description

technical field [0001] The invention relates to the field of radar ranging, in particular to a method for improving the ranging accuracy of a TOF phase method ranging radar. Background technique [0002] The TOF phase ranging radar refers to a device that performs non-contact ranging by the Time of Flight method. The TOF phase method ranging radar transmits a continuous wave modulation signal. According to the phase shift formed by the modulation signal going back and forth on the distance D to be measured once, the modulation signal propagates a period of distance on the optical path, and the phase is delayed by 2π. The speed of light is known. c. Therefore, as long as the phase delay φ of less than one cycle is measured, the round-trip time t of the modulated signal between the radar and the measured object can be determined indirectly, and the target distance D can be obtained. [0003] However, we cannot directly determine whether the calculated phase delay φ is within ...

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Problems solved by technology

[0007] In order to overcome the above-mentioned deficiencies in the prior art, the present invention provides a method for improving the ranging accuracy of the TOF phase method ranging radar, which solves the problem that the existing TOF laser (infrared) radar ranging accuracy and range cannot be balanced, and does not increase hardware cost

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