Frequency modulated continuous wave (FMCW) laser radar high-accuracy signal measurement method based on phase demodulation method
A laser radar and phase demodulation technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of limited signal subdivision, signal quality and low measurement accuracy, and achieve the effect of improving measurement accuracy and overcoming signal quality
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
specific Embodiment approach 1
[0043] The specific embodiment one, the FMCW laser radar high-precision signal measurement method based on the phase demodulation method described in the present embodiment, it is realized by the following steps:
[0044] Step 1. Use the laser to measure the laser radar optical path based on FMCW technology. During the measurement, perform linear chirp modulation on the laser, and the frequency modulation function of the laser output by the laser is:
[0045] f(t)=f 0 +αt+f e (t)
[0046] Where: f 0 is the initial laser frequency, α=Ω / T m , Ω is the frequency modulation range, T m is the chirp modulation period, f e (t) is a frequency modulation nonlinear term, and t is time;
[0047] Step 2, using the phase demodulation method to obtain the relationship between the phase change of the beat frequency signal in the FM laser radar optical path and the time delay τ of the measurement optical path relative to the reference optical path, the specific method is:
[0048] Calc...
specific Embodiment approach 2
[0069] Embodiment 2. The difference between this embodiment and the FMCW laser radar high-precision signal measurement method based on the phase demodulation method described in Embodiment 1 is that in step 3, according to the phase variation of the beat frequency signal and the measurement optical path relative to The relationship between the time delay τ of the reference optical path is used to calculate the measured distance R through the formula:
[0070]
[0071] achieved;
[0072] Where: c is the speed of light, Ω is the range of frequency modulation.
[0073] The present invention compares the frequency modulation function of the laser with various curves of beat signals under nonlinear conditions and ideal conditions: when the frequency modulation range Ω=0.25GHZ, the frequency modulation period T m =5ms, nonlinear rate η=10%, where η=max(f e (t)) / Ω, the measured distance R=12m, the ideal beat frequency is f 0 =4kHz. When the laser is nonlinear, such as Figure...
PUM
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com