High-accuracy distance measurement technology for smart station
A technology of distance measurement and super station instrument, which is applied in the field of distance measurement and can solve the problems of low precision and inability to meet the requirements of high-precision distance measurement.
Inactive Publication Date: 2012-05-23
BEIJING FORESTRY UNIVERSITY
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Problems solved by technology
At present, the accuracy of this method of phase measurement can only reach about 1‰, which is low in accuracy and cannot meet the requirements of high-precision distance measurement.
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[0006] The ranging signal of the super station instrument is regularly sampled by a 12-bit analog-to-digital converter to obtain a discrete signal sequence with the same sampling period interval; the discrete signal is subjected to fast Fourier transform (FFT), and the amplitude and sum of the ranging signal can be obtained. For the phase, the distance can be obtained according to the formula D=c / 4f(N+ΔN).
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The invention discloses a high-accuracy distance measurement technology for a smart station. By the technology, a distance measurement signal is regularly sampled by a 12-bit analogue to digital converter to obtain a discrete signal sequence with an identical same sampling period interval; and the discrete signal is subjected to fast Fourier transform (FFT) to obtain the amplitude and phase of the distance measurement signal. The phase discrimination accuracy of a phase measurement method is theoretically and experimentally proven to reach ten thousandth. If an accurate distance measurement ruler of the smart station is selected to be 1.5 meters long, the phase discrimination accuracy can reach 0.15 millimeter and completely meets the requirement of high-accuracy distance measurement of the smart station.
Description
1. Technical field [0001] The invention relates to a distance measurement technology, in particular to a high-precision distance measurement technology of a super station instrument. 2. Technical Background [0002] At present, domestic range finders all adopt the conventional digital phase measurement method, that is, the waveform is a sine wave, and the ranging signal is shaped into a square wave by a comparator. The rising edge of the ranging square wave turns on the counter, and the rising edge of the reference square wave turns off the counter; The obtained count value is the ranging phase. At present, the accuracy of this method of phase measurement can only reach about 1‰, which is low and cannot meet the requirements of high-precision distance measurement. 3. Contents of the invention [0003] The super station instrument adopts the principle of spectrum analysis method to measure phase. Similar to the principle of the spectrum analyzer, the ranging signal is reg...
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IPC IPC(8): G01S11/00
Inventor 冯仲科王佳
Owner BEIJING FORESTRY UNIVERSITY