IWR6843AOP: Phase saturation problem

Hello Reda,

Is there any chirp or profile configuration difference between these two measurements of yours? I'm just trying to understand if this happens randomly or is tied to a specific configuration.

Regards,

Ishita

Hello Ishita,

 The attached pictures are screenshots of the same measurement in different frames. It is the same chirp configuration, I tried with other chirp configuration but still had the same problem.

Regards

Reda

Just to give you more information, this is the lua script used for data collection:

-- define some variables
-- FramecConfig
CHIRP_LOOP = 100 --default 32 loops --max of 255 (for 256 loops [0-255])
FRAME_PERIOD = 50 --default 100ms
FRAME_COUNT = 800 -- infite count is 0

--BSS and MSS firmware download
info = debug.getinfo(1,'S');
file_path = (info.source);
file_path = string.gsub(file_path, "@","");
file_path = string.gsub(file_path, "DataCapture_Official.lua","");
fw_path = file_path.."..\\..\\rf_eval_firmware"

-- Manually specify partId
partId = 6843

--ADC_Data file path
-- data_path = file_path.."..\\PostProc\\adcCapture_5"
--adc_data_path = data_path.."\\adc_data.bin"
-- adc_data_path = data_path.."\\meas_x.bin"
-- adc_data_path = data_path.."\\recon_asc1.bin"

-- 19May2021
data_path = file_path.."..\\PostProc\\adcCapture"
adc_data_path = data_path.."\\test2x.bin"

-- -- Download Firmware

-- -- Download BSS Firmware

-- -- Download MSS Firmware

-- -- SPI Connect

-- -- RF Power UP

-- -------------does reconfiguration start from here?

-- StaticConfig Tab
-- if (ar1.ChanNAdcConfig(1, 1, 0, 1, 1, 1, 1, 2, 1, 0) == 0) then -- default
if (ar1.ChanNAdcConfig(1, 1, 1, 1, 1, 1, 1, 2, 1, 0) == 0) then --asc
WriteToLog("ChanNAdcConfig Success\n", "green")
else
WriteToLog("ChanNAdcConfig failure\n", "red")
end

if (partId == 1642) then
if (ar1.LPModConfig(0, 1) == 0) then
WriteToLog("LPModConfig Success\n", "green")
else
WriteToLog("LPModConfig failure\n", "red")
end
else
if (ar1.LPModConfig(0, 0) == 0) then
WriteToLog("Regualar mode Cfg Success\n", "green")
else
WriteToLog("Regualar mode Cfg failure\n", "red")
end
end

if (ar1.RfInit() == 0) then
WriteToLog("RfInit Success\n", "green")
else
WriteToLog("RfInit failure\n", "red")
end

RSTD.Sleep(1000)

-- DataConfig Tab
if (ar1.DataPathConfig(1, 1, 0) == 0) then
WriteToLog("DataPathConfig Success\n", "green")
else
WriteToLog("DataPathConfig failure\n", "red")
end

if (ar1.LvdsClkConfig(1, 1) == 0) then
WriteToLog("LvdsClkConfig Success\n", "green")
else
WriteToLog("LvdsClkConfig failure\n", "red")
end

if((partId == 1642) or (partId == 1843) or (partId == 6843)) then
if (ar1.LVDSLaneConfig(0, 1, 1, 0, 0, 1, 0, 0) == 0) then
WriteToLog("LVDSLaneConfig Success\n", "green")
else
WriteToLog("LVDSLaneConfig failure\n", "red")
end
elseif ((partId == 1243) or (partId == 1443)) then
if (ar1.LVDSLaneConfig(0, 1, 1, 1, 1, 1, 0, 0) == 0) then
WriteToLog("LVDSLaneConfig Success\n", "green")
else
WriteToLog("LVDSLaneConfig failure\n", "red")
end
end

-- -- skip performing TestSource

-- SensorConfig Tab
if((partId == 1642) or (partId == 1843)) then
if(ar1.ProfileConfig(0, 77, 100, 6, 60, 0, 0, 0, 0, 0, 0, 29.982, 0, 256, 5000, 0, 0, 30) == 0) then
WriteToLog("ProfileConfig Success\n", "green")
else
WriteToLog("ProfileConfig failure\n", "red")
end
elseif((partId == 1243) or (partId == 1443)) then
if(ar1.ProfileConfig(0, 77, 100, 6, 60, 0, 0, 0, 0, 0, 0, 29.982, 0, 256, 10000, 0, 0, 30) == 0) then
WriteToLog("ProfileConfig Success\n", "green")
else
WriteToLog("ProfileConfig failure\n", "red")
end
elseif(partId == 6843) then
-- VCO_0: 0
-- VCO_1: 131072
-- if(ar1.ProfileConfig(0, 60.25, 100, 6, 60, 0, 0, 0, 0, 0, 0, 29.982, 0, 256, 10000, 0, 131072, 30) == 0) then
if(ar1.ProfileConfig(0, 60.0, 100, 6, 50, 0, 0, 0, 0, 0, 0, 80, 0, 256, 6000, 0, 196608, 30) == 0) then --asc on VCO_0
WriteToLog("ProfileConfig Success\n", "green")
else
WriteToLog("ProfileConfig failure\n", "red")
end
end

-- ProfileConfig has been speficied in previous statements, but if needed (say if partId is not stated), uncomment follow statements
-- if(ar1.ProfileConfig(0, 60.25, 100, 6, 60, 0, 0, 0, 0, 0, 0, 29.982, 0, 256, 10000, 0, 131072, 30) == 0) then
-- WriteToLog("ProfileConfig Success\n", "green")
-- else
-- WriteToLog("ProfileConfig failure\n", "red")
-- end

-- if (ar1.ChirpConfig(0, 0, 0, 0, 0, 0, 0, 1, 1, 0) == 0) then --default
if (ar1.ChirpConfig(0, 0, 0, 0, 0, 0, 0, 1, 0, 0) == 0) then -- asc.chirp0
WriteToLog("ChirpConfig Success\n", "green")
else
WriteToLog("ChirpConfig failure\n", "red")
end

if (ar1.ChirpConfig(1, 1, 0, 0, 0, 0, 0, 0, 1, 0) == 0) then -- asc.chirp1
WriteToLog("ChirpConfig Success\n", "green")
else
WriteToLog("ChirpConfig failure\n", "red")
end

if (ar1.ChirpConfig(2, 2, 0, 0, 0, 0, 0, 0, 0, 1) == 0) then -- asc.chirp2
WriteToLog("ChirpConfig Success\n", "green")
else
WriteToLog("ChirpConfig failure\n", "red")
end

-- -- TestSource not performed
-- ar1.DisableTestSource(0)
-- if (ar1.EnableTestSource(1) == 0) then
-- WriteToLog("Enabling Test Source Success\n", "green")
-- else
-- WriteToLog("Enabling Test Source failure\n", "red")
-- end
-- frameCfg 0 2 32 0 100 1 0
-- if (ar1.FrameConfig(0, 0, 8, 128, 40, 0, 0, 1) == 0) then
if (ar1.FrameConfig(0, 2, FRAME_COUNT, CHIRP_LOOP, FRAME_PERIOD, 0, 0, 1) == 0) then --asc -- infite frame count
-- -- frameCount to be set to 0(infite frames) in deployement
WriteToLog("FrameConfig Success\n", "green")
else
WriteToLog("FrameConfig failure\n", "red")
end

-- DCAConfig and DataCapture
-- select Device type
if (ar1.SelectCaptureDevice("DCA1000") == 0) then
WriteToLog("SelectCaptureDevice Success\n", "green")
else
WriteToLog("SelectCaptureDevice failure\n", "red")
end

--DATA CAPTURE CARD API
if (ar1.CaptureCardConfig_EthInit("192.168.33.30", "192.168.33.180", "12:34:56:78:90:12", 4096, 4098) == 0) then
WriteToLog("CaptureCardConfig_EthInit Success\n", "green")
else
WriteToLog("CaptureCardConfig_EthInit failure\n", "red")
end

--AWR12xx or xWR14xx-1, xWR16xx or xWR18xx or xWR68xx- 2 (second parameter indicates the device type)
if ((partId == 1642) or (partId == 1843) or (partId == 6843)) then
if (ar1.CaptureCardConfig_Mode(1, 2, 1, 2, 3, 30) == 0) then
WriteToLog("CaptureCardConfig_Mode Success\n", "green")
else
WriteToLog("CaptureCardConfig_Mode failure\n", "red")
end
elseif ((partId == 1243) or (partId == 1443)) then
if (ar1.CaptureCardConfig_Mode(1, 1, 1, 2, 3, 30) == 0) then
WriteToLog("CaptureCardConfig_Mode Success\n", "green")
else
WriteToLog("CaptureCardConfig_Mode failure\n", "red")
end
end

if (ar1.CaptureCardConfig_PacketDelay(25) == 0) then
WriteToLog("CaptureCardConfig_PacketDelay Success\n", "green")
else
WriteToLog("CaptureCardConfig_PacketDelay failure\n", "red")
end

--Start Record ADC data
ar1.CaptureCardConfig_StartRecord(adc_data_path, 1)
RSTD.Sleep(1000)

--Trigger frame
ar1.StartFrame()
-- RSTD.Sleep(5000)

-- -- Stop Frame?? -- to send the command at the LUA shell
-- ar1.StopFrame()

-- --Post process the Capture RAW ADC data
-- ar1.StartMatlabPostProc(adc_data_path)
-- WriteToLog("Please wait for a few seconds for matlab post processing .....!!!! \n", "green")
-- RSTD.Sleep(10000)
-- --do post process manually
-- --or enter ar1.StartMatlabPostProc(adc_data_path) in the Lua Shell

Hi Reda

I've asked an expert to look into this query, please allow a few days for a response.

Regards,

AG

Hi, Reda:

From the phase information, it seems that some chirp has a zero phase.  Can you check the ADC data for those chirps and see whether the data are zeros for that chirp or see anything strange regarding those chirps?  

Best,

Zigang

Hello Zigang,

I checked the ADC data, indeed those chirps are equal to zero.

Kind regards

Reda