AWR1843: About the Max. velocity question

yimin bai34

Genius 4755 points

Part Number: AWR1843

Hi SIr

We can set the chirp parameters to get the max velocity.

for example: if the Vmax is 150km/h, we can adjust chirp parameters

if the Vmax is 150 km/h, there is one object getting closer to mmwave and the speed is 180km/h,.

What is the velocity AWR1843 can get from point cloud data? or AWR1843 can measure the speed which is 150km/h ?

please advise

Yimin

over 5 years ago

0 Cesar over 5 years ago

TI__Guru*** 141644 points

Hi,

Regarding Vmax,

First, the chirp configuration will define a Maximum Speed. We usually call this "Maximum Unambiguous Speed" This is the speed provided when one defines a chirp configuration in mmwave sensing estimator.

https://dev.ti.com/gallery/view/1792614/mmWaveSensingEstimator/ver/1.3.0/

Then, through algorithm implementation this "Maximum Unambiguous Speed" can be extended to a higher speed. We usually call that "Maximum Velocity Extended"

You will notice that the mmWave SDK OOB demo supports Velocity Extension x 2

Thank you

Cesar

0 Kyle Cousino over 5 years ago

TI__Mastermind 24955 points

Yimin,

You can use the mmWave Sensing Estimator tool to figure out the chirp parameters that would work for you given your max velocity requirement is 180 km/h.

Please see the attached file for an example configuration.

Regards,

Kyle

AWR1843.estimator.mmwave.json

{
    "configGenerator": {
        "createdBy": "mmWaveSensingEstimator",
        "createdOn": "2019-08-15T15:39:08.725Z",
        "isConfigIntermediate": 0
    },
    "currentVersion": {
        "jsonCfgVersion": {
            "major": 0,
            "minor": 4,
            "patch": 0
        },
        "DFPVersion": {
            "major": 1,
            "minor": 2,
            "patch": 0
        },
        "SDKVersion": {
            "major": 3,
            "minor": 0,
            "patch": 0
        },
        "mmwavelinkVersion": {
            "major": 1,
            "minor": 2,
            "patch": 0
        }
    },
    "lastBackwardCompatibleVersion": {
        "DFPVersion": {
            "major": 1,
            "minor": 1,
            "patch": 0
        },
        "SDKVersion": {
            "major": 2,
            "minor": 0,
            "patch": 0
        },
        "mmwavelinkVersion": {
            "major": 1,
            "minor": 1,
            "patch": 0
        }
    },
    "systemConfig": {
        "summary": "",
        "sceneParameters": {
            "ambientTemperature_degC": 20,
            "maxDetectableRange_m": 150,
            "rangeResolution_cm": 1000,
            "maxVelocity_kmph": 180,
            "velocityResolution_kmph": 1,
            "measurementRate": 10,
            "typicalDetectedObjectRCS": 1
        }
    },
    "regulatoryRestrictions": {
        "frequencyRangeBegin_GHz": 76,
        "frequencyRangeEnd_GHz": 77,
        "maxBandwidthAllowed_MHz": 1000,
        "maxTransmitPowerAllowed_dBm": 12
    },
    "processingChainConfig": {
        "detectionChain": {
            "name": "",
            "detectionLoss": 1,
            "systemLoss": 1,
            "implementationMargin": 2,
            "detectionSNR": 12,
            "theoreticalRxAntennaGain": 9,
            "theoreticalTxAntennaGain": 9
        }
    },
    "mmWaveDevices": [
        {
            "mmWaveDeviceId": 0,
            "rfConfig": {
                "summary": "",
                "waveformType": "singleFrameChirp",
                "MIMOScheme": "TDM",
                "rlChanCfg_t": {
                    "rxChannelEn": "0xF",
                    "txChannelEn": "0x3"
                },
                "rlAdcOutCfg_t": {
                    "fmt": {
                        "b2AdcBits": 2,
                        "b8FullScaleReducFctr": 0,
                        "b2AdcOutFmt": 2
                    }
                },
                "rlLowPowerModeCfg_t": {},
                "rlProfiles": [
                    {
                        "rlProfileCfg_t": {
                            "profileId": 0,
                            "pfVcoSelect": "0x0",
                            "pfCalLutUpdate": "0x0",
                            "startFreqConst_GHz": 76,
                            "idleTimeConst_usec": 2,
                            "adcStartTimeConst_usec": 4.2,
                            "rampEndTime_usec": 7.908572383665717,
                            "txOutPowerBackoffCode": "0x0",
                            "txPhaseShifter": "0x0",
                            "freqSlopeConst_MHz_usec": 5.6487321853637695,
                            "txStartTime_usec": 1,
                            "numAdcSamples": 17,
                            "digOutSampleRate": 10000,
                            "hpfCornerFreq1": 0,
                            "hpfCornerFreq2": 0,
                            "rxGain_dB": "0x1E"
                        }
                    }
                ],
                "rlChirps": [
                    {
                        "rlChirpCfg_t": {
                            "chirpStartIdx": 0,
                            "chirpEndIdx": 0,
                            "profileId": 0,
                            "startFreqVar_MHz": 0,
                            "freqSlopeVar_KHz_usec": 0,
                            "idleTimeVar_usec": 0,
                            "adcStartTimeVar_usec": 0,
                            "txEnable": "0x1"
                        }
                    }
                ],
                "rlRfCalMonTimeUntConf_t": {
                    "calibMonTimeUnit": 1
                },
                "rlRfCalMonFreqLimitConf_t": {
                    "freqLimitLow_GHz": 76,
                    "freqLimitHigh_GHz": 77
                },
                "rlRfInitCalConf_t": {
                    "calibEnMask": "0x1FF0"
                },
                "rlRunTimeCalibConf_t": {
                    "oneTimeCalibEnMask": "0x0",
                    "periodicCalibEnMask": "0x0",
                    "calibPeriodicity": 10,
                    "reportEn": 1,
                    "txPowerCalMode": 0
                },
                "rlFrameCfg_t": {
                    "chirpEndIdx": 0,
                    "chirpStartIdx": 0,
                    "numLoops": 356,
                    "numFrames": 0,
                    "framePeriodicity_msec": 7.12
                }
            },
            "rawDataCaptureConfig": {
                "rlDevDataFmtCfg_t": {
                    "iqSwapSel": 0,
                    "chInterleave": 1
                }
            },
            "monitoringConfig": {}
        }
    ]
}

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AWR1843: About the Max. velocity question