US 12,474,474 B2
Collaborative phase-shift laser ranging device based on differential modulation and demodulation of coarse and precise measuring wavelength and ranging method thereof
Hongxing Yang, Heilongjiang (CN); Jing Li, Heilongjiang (CN); Pengcheng Hu, Heilongjiang (CN); Xu Xing, Heilongjiang (CN); and Jiubin Tan, Heilongjiang (CN)
Filed by Harbin Institute of Technology, Heilongjiang (CN)
Filed on Apr. 1, 2022, as Appl. No. 17/711,026.
Claims priority of application No. 202110925288.3 (CN), filed on Aug. 12, 2021.
Prior Publication US 2023/0050363 A1, Feb. 16, 2023
Int. Cl. G01S 17/36 (2006.01); G01S 7/4912 (2020.01)
CPC G01S 17/36 (2013.01) [G01S 7/4916 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A collaborative phase-shift laser ranging device based on differential modulation and demodulation of coarse and precise measuring wavelength, wherein the device comprises a measuring terminal and a collaboration terminal, the measuring terminal comprising a multi-frequency generating module producing three paths of output, a laser modulation module, a measuring-terminal light path, and a light signal receiving and processing module, wherein two of the three paths of output are input to the laser modulation module for laser modulation, the other one path of output is input to the light signal receiving and processing module, output light from the laser modulation module is input to the measuring-terminal light path, and two paths of output light from the measuring-terminal light path are input to the measuring terminal light signal receiving and processing module as measurement light signals and reference light signals, respectively, for phase detection;
wherein the multi-frequency generating module comprises a first crystal oscillator, a second crystal oscillator, a third crystal oscillator, a first phase locked frequency multiplier, a second phase locked frequency multiplier, a third phase locked frequency multiplier, a fourth phase locked frequency multiplier, a first amplifying circuit, a second amplifying circuit, a third amplifying circuit, a fourth amplifying circuit, a fifth amplifying circuit, a first power combiner and a second power combiner;
an output terminal of the first crystal oscillator is connected to an input terminal of the first phase locked frequency multiplier and passes through the first amplifying circuit; an output signal of the first crystal oscillator is connected to an input terminal of the second phase locked frequency multiplier and passes through the second amplifying circuit, an output terminal of the second crystal oscillator is connected to an input terminal of the third amplifying circuit, and an output signal of the third crystal oscillator is connected to an input terminal of the third phase locked frequency multiplier and passes through the fourth amplifying circuit; an output signal of the third crystal oscillator is connected to an input terminal of the fourth phase locked frequency multiplier and passes through the fifth amplifying circuit; an output terminal of the first amplifying circuit and an output terminal of the fifth amplifying circuit are input to two input terminals of the first power combiner, respectively, an output terminal of the first power combiner is connected to an input terminal of a first electro-optical modulator as a driving signal, an output terminal of the second power combiner is connected to an input terminal of a second electro-optical modulator as a driving signal, and an output terminal of the second amplifying circuit is connected to input terminals of a third electro-optical modulator and a fourth electro-optical modulator as a driving signal.