FMCW Radar Project

This project implements a Frequency Modulated Continuous Wave (FMCW) radar system using the RF K-LC6 radar transceiver and a custom analog front end. The analog section amplifies and filters the I/Q signals from the radar before they are digitized and sent to a Raspberry Pi for processing.

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Components Required

• 1 × RF K-LC6 Radar Module
• 4 × MCP6022 Op Amps
• 2 × MCP3201 ADCs
• Various resistors and capacitors (for filtering)
• 1 × Breadboard
• 1 × Raspberry Pi Model 4B
• 1 × 5V power supply

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System Overview

A chirp signal is generated and applied to the radar’s VCO input. The radar outputs two baseband signals: the in-phase (I) and quadrature (Q) components.
Each signal passes through an op amp for amplification and a 7 kHz low-pass filter to remove unwanted high-frequency components. The filtered signals are then digitized using two MCP3201 ADCs and read by the Raspberry Pi.

RF K-LC6

• Input: Chirp modulation signal
• Outputs: I and Q baseband channels

MCP3201 ADC Connections (per channel)

Pin	Connection
VD0	5 V
VREF	3.3 V
IN+	I or Q signal (from low-pass filter)
IN-	GND
VSS	GND
CLK	GPIO 11
DOUT	GPIO 9
CS (ADC1)	GPIO 8
CS (ADC2)	GPIO 7

Summary of Operation

1. A chirp signal is applied to the radar’s VCO input.
2. The K-LC6 outputs I and Q baseband signals that represent the mixed transmitted and received chirp.
3. Each signal is amplified by an MCP6022 stage.
4. A 7 kHz low-pass filter removes high-frequency noise.
5. The analog signals are digitized by the MCP3201 ADCs.
6. The Raspberry Pi reads the samples and performs FFT-based processing to estimate range and velocity.

System Overview Image 1

System Overview Image 2