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  • PAZ Instrument Internal Calibration Performance

    J. del Castillo1, A. Lopez1, M. García1, P. Cifuentes1, B. Gómez1

    castillomja@inta.es

    1Spanish National Institute for Aerospace Technology -INTA-

    mailto:castillomja@inta.es

  • PAZ Instrument Internal Calibration Performance and Foreseen In-flight Tests

    CEOSSAR2015 – October 29th Pag.: 2

    Outline

    PAZ Radar Instrument Overview Internal Calibration capabilities and approach Internal Calibration Data set TR Modules monitoring Internal calibration signals, replica and thermal behaviour Noise data analysis Summary

  • PAZ Instrument Internal Calibration Performance and Foreseen In-flight Tests

    PAZ Radar Instrument Overview

    X-band radar instrument on recurrent platform from TSX/TDX. Back end (RF & CE) recurrent from TDX X-band front-end composed by 12 panels with 32 elevation elements each. New PAZ developments:

    TR modules and Subarrays. Panel distribution network and calibration network. Leaf amplifier assembly. Panel supply, Panel control and Remote Terminal units.

    Pag.: 3

    P C N

    P C N

    P C N

    L A

    A

    P D N

    L A

    A

    32 SAs

    32 TRMs

    Back end

    F r o n t e n d

    Tx_in/Rx_out

    Tx_in/Rx_out

    Cal_in/Cal_out

    Cal_in/Cal_out

    PCU

    PSU

    RTU

    CEOS-SAR2015 – October 29th

  • PAZ Instrument Internal Calibration Performance and Foreseen In-flight Tests

    P C N

    Internal Calibration capabilities and approach

    Calibration capabilities drived by RF/CE design. Heritage from TSX/TDX Same 3 signal paths for one calibration pulse each:

    Tx cal pulse: Sample of Tx signal is routed back to CE through cal network. Rx cal pulse Cal signal from CE is injected in Rx through cal network. CE cal pulse: common RF part covered in both Tx and Rx path.

    Pag.: 4 CEOS-SAR2015 - October 29th

    P C N

    P C N

    L A

    A

    P D N L

    A A

    32 SAs

    Tx

    Rx

    RFE DCE

    32 TRMs

    C R

    D

    Cal_out

    Cal_in

    Back end

    F r o n t e n d

  • PAZ Instrument Internal Calibration Performance and Foreseen In-flight Tests

    Internal Calibration capabilities and approach

    Proper combination of calibration pulses allows: Instrument response Drift monitoring. Instrument Replica retrieval.

    TRM monitoring by dedicated PN gating DTs execution  Acquires TRM setting deviation (Drifted/Failed modules).

    Pag.: 5 CEOS-SAR2015 - October 29th

    Warm up

    Replica

    Interleave cal

    Radar pulses

    ICAL, ATRM upgraded with PAZ particularities/constraints tested and validated with PAZ data.

    Tool set from DLR PAZ Instrument sensors. PAZ new calibration network. PAZ Instrument thermal behaviour and automatic temperature compensation approach:

    One Near state table for each TRM. One temperature compensation law for all TRMs

  • PAZ Instrument Internal Calibration Performance and Foreseen In-flight Tests

    Internal Calibration Data set

    Nominal imaging Data takes and only calibration pulses data takes available from 2 test with PAZ instrument: SVT1B and TVTB SVT1B: system verification test with Satellite at ambient temperature.

    Data takes commanded via PAZ ground segment MCS. Data recorded at satellite delivered to CALVAL. Nominal imaging data takes (Strip, Scan, HR and HS) with embedded cal pulses 2 PN gating executions.

    TVTB: Thermal vacuum/Thermal Balance campaign. Satellite in vacuum chamber at operation temperature limits (HOT and COLD phases)

    420 seconds Only calibration pulses Data takes at temperature limits. PN Gating executions with nominal and redundant chain at different temperature.

    CEOS-SAR2015 - October 29th Pag.: 6

  • PAZ Instrument Internal Calibration Performance and Foreseen In-flight Tests

    TR Modules monitoring I

    SVT1B data analysis (PN gating execution at ambient temperature) Module, row and panel execution(all TRM working)

    Module execution (10 modules off Tx, 10 modules off Rx and half panel off)

    Pag.: 7

    Panel pairs jumps

    detected No LAA at antenna offset measurement

    CEOS-SAR2015 - October 29th

  • PAZ Instrument Internal Calibration Performance and Foreseen In-flight Tests

    TR Modules monitoring II

    TVTB data analysis (thermal vacuum thermal balance test results) PN gating Executions at HOT & COLD operation limits (nom and red)

    Retrieved TRM reference by execution averaging.

    Measured TRM monitoring performance.

    Pag.: 8

    Retrieved PAZ PNGating accuraccy *1 σ deviation from reference

    Accuracy* Amp[dB] Phase[deg]

    TX MODULE 0,14 5,16

    RX MODULE 0,30 3,89

    TX PANEL 0,07 2,35

    RX PANEL 0,19 1,07

    TX ROW 0,04 0,65

    RX ROW 0,28 0,54

    CEOS-SAR2015 - October 29th

  • PAZ Instrument Internal Calibration Performance and Foreseen In-flight Tests

    Internal calibration performance I

    Raw cal pulses and replica analysis at SVT1B test Pulse delay, SNR, Dynamic Range, Spurious level

    Pag.: 9 CEOS-SAR2015 - October 29th

    CE config RxBW 100MHz 150MHz 300MHz

    µ σ µ σ µ σ SNR[dB] 26.30 1.6 27.19 1.64 26.57 1.34

    D Range [AD units] 82.92 1.63 85.07 1.58 107.65 1.36

    Spurious level[dB] -35.51 3.81 -34.43 4.05 -32.86 5.30

    T rise[us] 1.2466 2.5ns 1.2336 3.5ns 1.2147 0.8ns

    Data take FID01 SM-single

    RxBw:100MHz

    All DTs RxBw:100MHz

  • PAZ Instrument Internal Calibration Performance and Foreseen In-flight Tests

    Internal calibration performance II

    Pag.: 10

    Replica IRF analysis versus BW with SVT1B test data:

    Data take FID08 SM-dual RxBw:100MHz

    CE config RxBW 100MHz 150MHz 300MHz

    µ σ µ σ µ σ IRF_resol[m] 1.50 0 1.0 0 0.5 0 IRF_PSLR[dB] -18.22 0.04 -14.97 0.05 -14.55 0.05

    IRF_ISLR[dB] 12.27 0.02 10.89 0.01 10.04 0.01

    All DTs RxBw:100MHz

    CEOS-SAR2015 - October 29th

  • PAZ Instrument Internal Calibration Performance and Foreseen In-flight Tests

    Internal calibration performance III

    Instrument drift during 420sec Only cal pulses acquisitions at TVTB test

    Pag.: 11

    Drift

  • PAZ Instrument Internal Calibration Performance and Foreseen In-flight Tests

    TVTB HOT and COLD (instrument operation limits) Panel TR Modules Panel calibration network Calibration network LAA TR modules temperature evolution

    Front-end Thermal behavior

    Pag.: 12

    B a c k e n d

    F r o n t e n d

    CEOS-SAR2015 - October 29th

    All monitored elements inside [-20º,+50º] range

    H O T 4 2 0 s

    C O L D 4 2 0 s

  • PAZ Instrument Internal Calibration Performance and Foreseen In-flight Tests

    Internal calibration performance IV

    Calibration network response variation with Temperature at TVTB

    Pag.: 13

    HOT 420s DT COLD 420s DT Cal network 2way

    Hot amplitude

    μ -0.66 dB

    σ 0.004dB

    Hot Phase μ 13.8º

    σ 0.23º

    Cold amplitude μ 0.80dB

    σ 0.008dB

    Cold Phase μ -5.7º

    σ 0.26º

    Replica correction Approach DT to DT amplitude and phase correction (up to 1.5dB) Intra data take not corrected due to cal. network stability.

    CEOS-SAR2015 - October 29th

    0.005dB 1σ 0.008dB 1σ

    0.23º 1σ 0.26º 1σ

  • PAZ Instrument Internal Calibration Performance and Foreseen In-flight Tests

    Noise records analysis I

    I-Q demodulator and ADC characterization with SVT1B noise record data I-Q Channels bias. I-Q amplitude unbalance. I-Q non orthogonallity.

    Pag.: 14

    I-Q parameters 100MHz 150MHz 300MHz µ σ µ σ µ σ

    Ibias[ADC units] 0.53 0.02 0.68 0.02 0.65 0.02

    Qbias[ADC units] 0.46 0.02 0.42 0.02 0.52 0.02

    I-Q amp unbalance[ratio] 0.97 0.01 0.97 0.01 0.98 0.01

    I-Q non orthogonallity[deg] 0.59 0.47 0.60 0.41 0.76 0.32

    Data take FID01 SM-single RxBw:100MHz

    All DTs RxBw:100MHz

    CEOS-SAR2015 - October 29th

  • PAZ Instrument Internal Calibration Performance and Foreseen In-flight Tests

    Noise records analysis II

    H-V channels Noise power unbalance

    Pag.: 15

    Strip_Dual

    All DTs RxBw:100MHz

    Data take FID08 SM-dual RxBw:100MHz

    H noise power

    V noise power

    0.42 dB noise power delta

    Rx response stability within Rx window Tested with echoes from SVT data takes No radar return Only noise Measured Power can be used to estimate Rx gain variation Phase variation can not be measured

    0.5dBpp

    CEOS-SAR2015 - October 29th

    Strip_single

  • PAZ Instrument Internal Calibration Performance and Foreseen In-flight Tests

    Noise records analysis III Rx Gain setting accuracy test by noise analysis.

    Noise analysis limitation:

    Only Rx amplitude accuracy. No phase due to

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