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Application Note

page 29 of 32

V1.0

2021-03-31

Distance2GoL (Software-Controlled FMCW) low-power radar shield using
BGT24LTR11 for range detection and human tracking

Authors

Radar Application Engineering Team, Business Line “Radio Frequency and Sensors”

Summary of Contents for BGT24LTR11

Page 1: ...GHz low power transceiver chip BGT24LTR11 1 The application note describes the hardware configuration and specifications of the sensor module in detail 2 The document also provides a guide to configu...

Page 2: ...T24LTR11 Shield 12 4 1 Overview 12 4 2 Block diagram 13 4 3 Power supply 15 4 4 EEPROM 15 4 5 RF front end Shield 15 4 6 BGT24LTR11 24 GHz transceiver MMIC 16 4 7 Antennas 17 4 8 Analog baseband secti...

Page 3: ...ck diagram Distance2GoL 14 Figure 7 Block diagram power supply concept 15 Figure 8 EEPROM block diagram 15 Figure 9 RF front end overview top 16 Figure 10 Block diagram BGT24LTR11 MMIC 16 Figure 11 Si...

Page 4: ...to MCU pin connections 19 Table 3 Baseband amplifier components and settings 19 Table 4 IF vs FMCW ramp parameters vs target distance 20 Table 5 Power consumption overview 21 Table 6 Power consumptio...

Page 5: ...FMCW for range estimation In FMCW the time delay between the transmitted and received chirp is used for measuring the distance to the target s The transmitted and received signals are mixed and then...

Page 6: ...end application as it detects through non metallic materials Note The platform serves as a demonstrator platform with the software to perform simple motion sensing The test data in this document show...

Page 7: ...r the BGT24LTR11 Shield Software Controlled FMCW is designed to perform human target range detection and tracking with low power consumption In this approach the BGT24LTR11 MMIC is controlled using a...

Page 8: ...EP 1 STEP 2 STEP 3 Box contents BGT24LTR11 Shield Software Controlled FMCW Radar Baseboard XMC4700 Infineon Toolbox Go to Infineon Products and Tools Infineon Toolbox Click on Infineon Toolbox Launche...

Page 9: ...4700 Debug port Insert the USB connector into the PC s USB port If the device driver is not recognized Right click on My Computer Manage Device Manager Other devices Right click on Unknown device Upda...

Page 10: ...ftware Communication Library ComLib_Matlab_Interface Examples GettingStarted Copy the path Open MATLAB Paste the path in the top tab extract_raw_data m file will show up on the left tab Connect board...

Page 11: ...6 dBm Loss TXOUT to ant input 2 dB Simulated ant gain 10 dBi Receiver characteristics Receiver frequency GHz 24 025 24 125 24 225 IF conversion gain stage 1 dB 30 Customizable by re soldering baseband...

Page 12: ...t contains the following sections RF part consists of the Infineon 24 GHz radar MMIC BGT24LTR11 and includes micro strip patch antennas for the TX and RX sections Analog amplifier part amplifies the i...

Page 13: ...controlled via a Digital to Analog Converter DAC in the microcontroller unit The DAC output V_TUNE_IN is smoothed by two RC low pass filters and fed to the V_TUNE input of the BGT24LTR11 The IF outpu...

Page 14: ...ge 14 of 32 V1 0 2021 03 31 Distance2GoL Software Controlled FMCW low power radar shield using BGT24LTR11 for range detection and human tracking Hardware description BGT24LTR11 Shield Figure 6 Block d...

Page 15: ...nd out of the device The Serial Clock SCL is an input that is used to synchronize the data from and to the device When the Shield is plugged into the Radar Baseboard XMC4700 the sensor s supplies are...

Page 16: ...d reception operating in the 24 000 GHz to 24 250 GHz ISM band It is based on a 24 GHz fundamental Voltage Controlled Oscillator VCO Figure 10 Block diagram BGT24LTR11 MMIC A built in voltage source d...

Page 17: ...tracking Hardware description BGT24LTR11 Shield 4 7 Antennas The BGT24LTR11 Shield features a 4 x 1 array antenna for the transceiver and receiver sections The antenna has a gain of 9 6 dBi and an op...

Page 18: ...op amps As shown in Figure 12 and Figure 13 the I Q outputs of the BGT are filtered and amplified in the first gain stage The second gain stage consists of a multiple feedback active filter topology w...

Page 19: ...pending on the target RCS and distance to be detected The low gain output is referenced to the individual mixer output bias voltage 1 6 to 2 0 V and the high gain stage is AC coupled and referenced to...

Page 20: ...at different distances The baseband section is designed to meet the required IF cut offs Table 4 gives an example of IFs produced by stationary targets at particular distances corresponding to differe...

Page 21: ...around 2 ms Thus the mean total recalibration time per frame tcalib is 3 ms at maximum The baseband section consists of the two stages of op amps and the voltage divider It is turned on simultaneousl...

Page 22: ...Table 10 Table 11 and Table 12 describe the pins 8 7 6 5 4 3 2 1 8 4 2 1 6 8 7 6 4 1 6 5 3 7 9 2 3 5 3 2 1 5 4 2 3 1 1 4 5 7 8 6 3 2 10 Figure 15 External headers P1 P2 P3 P4 P5 and P6 Table 7 Externa...

Page 23: ...IFI and IFQ Table 9 External headers P3 pin description Pin no Signal name Pin description 2 IOREF Reference signal 4 3V3 3 3 V power supply to Arduino 5 5V 5 V power supply to Arduino 6 Ground Groun...

Page 24: ...d stage on off 3 V_DAC_1 Control signal for V_DAC Notes 1 Pins 5 6 of header P2 are not connected to any signal 2 Pins 1 3 8 of header P3 are not connected to any signal 3 Pins 1 4 6 7 8 of header P4...

Page 25: ...sence detection motion detection proximity sensing and direction of movement detection for a single human target in 1D It enables detection and tracking of a human walking within a linear distance of...

Page 26: ...2GoL demo board is also tested inside a temperature chamber for the bandwidth and out of band emissions at the temperature limits of 40 25 and 85 C Markers 1 and 2 are set to 24 000 GHz and 24 250 GHz...

Page 27: ...27 of 32 V1 0 2021 03 31 Distance2GoL Software Controlled FMCW low power radar shield using BGT24LTR11 for range detection and human tracking Measurement results Figure 19 Bandwidth check at 40 insid...

Page 28: ...before designing an end product 8 2 Regulations in Europe In Europe the European Telecommunications Standards Institute ETSI defines the regulations For more details on the ETSI standards please refe...

Page 29: ...2 V1 0 2021 03 31 Distance2GoL Software Controlled FMCW low power radar shield using BGT24LTR11 for range detection and human tracking Authors 9 Authors Radar Application Engineering Team Business Lin...

Page 30: ...TR11 for range detection and human tracking References 10 References 1 Infineon BGT24LTR11N16 24 GHz radar IC datasheet 2 Infineon BGT24LTR11 product brief 3 Infineon application note AN472 user s gui...

Page 31: ...31 Distance2GoL Software Controlled FMCW low power radar shield using BGT24LTR11 for range detection and human tracking Revision history Revision history Document version Date of release Description...

Page 32: ...intellectual property rights of any third party with respect to any and all information given in this application note The data contained in this document is exclusively intended for technically trai...

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