FMCW sensor
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FMCW sensors
24 GHz RADAR Sensors for Distance, Angle and Velocity Measurements

  • FMCW and Doppler Mode
  • ISM to 2GHz Bandwidth
  • Onboard Signal Processing
  • Evaluation Software included
  • Compact Size
  • Wireless Data Transfer available
"Tx2Rx" Module
with 1 transmit and 2 receive antennas
"DS-1200" Module
with 1 transmit and 2 receive antennas
"TxRx" Module
with 1 transmit and 1 receive antenna

The 24 GHz FMCW Radars are miniaturized, ultralight sensor units. The systems comprise manifold configurable RF frontends with digital signal processing and programmable interface. The controller allows flexible generation of radar signals and provides enough computation power to perform signal processing for target detection or even complex tracking algorithms. The radar unit is equipped with an SPI interface which allows the user to define all radar settings and to receive all measured data. These data can be calculated properties from single targets (like distance, angle and speed) or complex time- or frequency domain curves for user-defined evaluations. If needed the user can implement customer tailored algorithms for specific applications.

The Developer Kit comprises the Radar Sensor, PC software with Graphical User Interface and an USB cable/adapter for user-friendly startup, testing and application specific integration of the radar unit. The software allows parameter settings and visualization of measured radar data. Typical parameters are detection range, resolution, frequency bandwidth, output power, radar signal shape and duration. The measurement results are shown in different types of graphs and can be exported to csv-files.

An Expert Mode allows the experienced user to test the radar sensor beyond the ISM band limitations by increasing the frequency bandwidth and the RF output power.

• 24 GHz ISM-Band Radar-Module appl. FMCW

• 2 Receive Antennas with I/Q Channels each

• Distance and Velocity Measurements

• Target Detection with Angle Information

• Onboard Signal Generation with DDS

• Onboard Signal Processing with DSC

• SPI or USB Interface

• Weatherproofed Housing

• PC-Software with Graphical User Interface

• Human Tracking, Intruder Detection

• Obstacle Recognition

• Distance and Speed Monitoring

• Terrain Mapping, Awareness and

Warning (TAWS)

• Dedicated for UAVs and Drones

Single-Channel (TxRx) Frontend

The single-channel module consists of one transmit and one receive antenna with the FMCW frontend on the backside of the multilayer PTFE board. It is optimized for small size and low weight: (2.5x3.5)cm2, 5gr.

Multi-Channel (Tx2Rx) Frontends

For applications that require an angular resolution of targets IMST offers multi-channel modules. These modules have multiple receive (Rx) antennas in a very compact array design. A dual channel (2Rx) module with IQ mixers is directly available. Modules providing a larger number of channels can be developed on request.

Intruder Detection, Human Tracking

A specific human tracking algorithm has been developed for the 2-channel radar. Persons can be detected and traced while they are moving in a predefined terrain. The radar is capable to support camera surveillance systems, follow intruders and to take close-up pictures.

Radar Solutions for RPAS Systems

IMST's Hexacopter has been equipped with our radar modules for different purposes. The Tx2Rx sensor is applied for obstacle recognition to avoid collisions or to control the flight path in adverse environments like indoor surveillances. Multiple radar modules can be installed to protect the UAV from all directions.

The polarimetric radar has been installed to characterize properties of agricultural fields. It has been proven, that roughness and moisture of soil strongly influence the reflection properties of circular polarized fields. Further investigations will be made to characterize different kinds of surfaces for other applications as well.

A Synthetic Aperture Radar (SAR) is under development. The module will consist of 8 receive channels to scan the ground profile during an overflight path. Data recording and processing is done with two Digital Signal Controllers as part of the SAR system.

Radar Polarimetry

In the project Smart Inspectors (Smart Aerial Test Rigs with Infrared Spectrometers and Radars, an INTERREG Project) IMST developed this polarimetric radar with one transmit and two receive channels. The transmit antenna is radiating in RCP (Right Hand Circular Polarization) while the two receive antennas are designed for RCP and LCP (Left Hand Circular Polarization). The evaluation of the complex back-scattered signals from agricultural fields or any other surfaces is done by a digital signal processor on one of the three boards behind the antenna and frontend module. First measurements with project partners have proven, that roughness and moisture of soil show characteristic behavior in the polarization of the signals. Further test campaigns will be carried out in the next project phases.

Parameters Typical Properties
"GI-1200" Radar in Housing
with "DS-1200" Module
RADAR Method
FMCW and Doppler Mode
Centre Frequency 24 GHz (fISM = 24.125 GHz)
Bandwidth ISM to 2 GHz (bISM = 250 MHz)
Resolution dm Range (depending on bandwidth)
Accuracy cm Range (depending on bandwidth)
Distance to Targets 10cm to 30m (human tracking), 200m (sky)
Output Power 20 dBm EIRP

Antenna Characteristic

36° Elevation, 64° Azimuth
9 dBi Antenna Gain
24° Elevation, 58° (Tx), 70° (Rx) Azimuth
Angular Resolution
<50 cm @ 15 m
Housing, Water resistant

# References
Flyer Preliminary Data Sheet
[26] 24 GHz Radar Sensor integrates Patch Antenna and Frontend Module in single Multilayer LTCC
[23] LTCC Short Range Radar Sensor for Automotive Applications at 24 GHz
[22] 24 GHz radar sensor uses Green TapeTM LTCC technology to detect the proximity of objects
[20] Integrated stacked patch antenna array on LTCC material operating at 24 GHz
©2001-2014 IMST GmbH, Last update: RK 22-Nov.-2013