Speed and distance measurement method based on multi-linear frequency sweep rate

• Main Authors: HU SIQI, SUN JIANFENG, WU KAN, CAO XIANYI, CHEN JIANPING
• Format: Patent
• Language: Chinese; English
• Published: 23.02.2024
• Subjects: ANALOGOUS ARRANGEMENTS USING OTHER WAVES; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; TESTING

The invention relates to a speed and distance measurement method based on multiple linear frequency sweeping rates, which comprises the following steps of: generating two groups of linear frequency modulation signals which have different frequency sweeping rates, the same duration time, the same frequency sweeping bandwidth and the opposite frequency sweeping directions and are alternated in a time domain, and using the linear frequency modulation signals as signal light and reference light for frequency modulation continuous wave detection. Based on bidirectional frequency sweeping, when the signal light and the reference light are mixed, four beat frequency signals, namely fD +/-gamma1tau and fD +/-gamma2tau, are generated, gamma1 and gamma2 represent two different linear frequency sweeping rates respectively, and tau is time delay between the signal light and the reference light; through differential processing of the four beat frequency signals, the Doppler frequency shift amount and the frequency shift a