Stanford EE259 I MIMO imaging radar, direction of arrival est, target detection I 2023 I Lecture 13

TL;DR

This analysis explores the signal model and processing techniques used in FMCW radar for range and velocity estimation.

Transcript

so let's uh do a quick review of uh last lecture so last time we kind of did a high level uh taxonomy of of radar and it looks very similar to uh sonar so in terms of the waveforms that Radars use uh we said that there's there's two main types you either have pulse radar which sends these uh short uh pulses or you have a CW or a continuous wave rad... Read More

Key Insights

• 😒 FMCW radar uses different waveforms and antenna configurations to estimate range and velocity.
• 🙊 Range estimation is done by taking the Fourier transform of the IF signal and identifying peaks.
• ⚾ Velocity estimation is based on the phase difference between consecutive chirps, which is used to estimate Doppler shift and radial velocity.
• ☠️ The choice of parameters like frame duration and sampling rate affects the resolution and maximum detectable velocity.
• 🧡 Assumptions about constant range and velocity within a frame are crucial for accurate estimation.
• 🈸 The system can be configured to optimize performance for specific applications.
• 🐿️ Non-idealities in waveform and idle time between chips must be considered for accurate processing.
• 🧡 FMCW radar has trade-offs between range resolution, maximum range, velocity resolution, and maximum velocity.

Questions & Answers

Q: What are the two main types of waveforms used in FMCW radar?

The two main types of waveforms used in FMCW radar are pulse radar and continuous wave radar.

Q: How do we estimate range using FMCW radar?

Range estimation is done by taking the Fourier transform of the IF signal and identifying peaks corresponding to target range.

Q: What is the significance of the phase difference between consecutive chirps in FMCW radar?

The phase difference between consecutive chirps can be used to estimate the Doppler shift and subsequently the radial velocity of the target.

Q: How is velocity estimation affected by the frame duration in FMCW radar?

The frame duration affects the velocity resolution and maximum detectable velocity. A longer frame duration improves resolution but reduces the maximum detectable velocity.

Summary & Key Takeaways

• FMCW radar uses pulse and continuous waveforms to estimate range and velocity. It commonly uses FMCW radar for autonomous robotics applications.

• Range estimation is done by taking the Fourier transform of the intermediate frequency signal and finding peaks corresponding to target range.

• Velocity estimation is done by calculating the phase difference between consecutive chirps and estimating the Doppler shift, which is then converted to radial velocity.