Intersoft Electronics RFA641 - Rfa for Ads-B Main Control; Theory; Figure 98: RFA641 Connected to RIM782 Showing the ADS-B Plots on a Laptop; Figure 99: Test Scenario Definition and Transponder Properties

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Radar Field Analyser - RFA641 Edition Date: 28-Feb-18

9. RFA FOR ADS-B MAIN CONTROL

9.1. Theory

As an example a simple scenario with 36 targets in a circle, flying outbound and making predefined

movements is shown below.

Then the scenario is compiled and played using the RFA ADSB control tool. The output of the ADS-B

ground receiver, send using a UDP-Broadcast data stream of ASTERIX cat 21, is recorded using a separate

laptop.

IE-UM-00165-005 RFA641 User Manual.odt 84/110

Figure 99: Test scenario definition and transponder properties

Figure 98: RFA641 connected to RIM782 showing the ADS-B plots on a laptop

Main Page

Table of Contents4
Technical Manual Rfa64113
General Introduction13
Key Features13
Hardware Description14
Block Diagram14
Connectors and Specifications14
Figure 1: Block Diagram14
Table 1: Interfaces14
Table 2: Transmitter15
Table 3: Receiver15
Table 4: YIG Preselector Filter15
Self Test /Calibration16
Theory16
Software16
Getting Started16
Figure 2: RFA Selftest Software16
Figure 3: Device Information16
Internal Tx Calibration Method17
Figure 4: Selecting the Calibration Method17
Figure 5: Measured YIG Filter Attenuation18
External Tx Calibration Method19
Figure 6: LRU499 Calibration Table19
Figure 7: LRU499 Device Information19
Troubleshooting20
Plink21
Theory21
Getting Started21
Software22
Figure 8: Uplink Software22
Figure 9: Measurement Type Selection22
Figure 10: Recording Path22
Figure 11: Uplink Scope View23
Figure 12: Uplink Pulse Program24
The Frequency Sweep Function25
Figure 13: Frequency Sweep Function25
Figure 14: Frequency Sweep Y-Axis Selection25
RFA Recorder: Using the External Video Input26
Figure 15: HPD Parameters26
Figure 16: External Receiver Calibration27
Figure 17: LRU External Calibration27
View Recorded Pulses28
RFA Data Analysis: Create Hpds from a Pulse Recording28
View RFA Pulses28
Figure 18: View RFA Pulses Software28
Figure 19: View Scope Recording29
Figure 20: PSR Pulse File Example30
Figure 21: SSR Pulse File Example30
Figure 22: Pulse Scope Graph30
Figure 23: Select Pulses for HPD Extraction31
Figure 24: View Timing Window: Extracting the Stagger Pattern31
Figure 25: Classical Ssr/Mode-S Selection32
Figure 26: Stagger Pattern Selection32
Extracting and Logging the HPD Diagram33
Figure 27: Random Stagger Pattern33
Figure 28: HPD Extraction Method33
Figure 29: HPD Extraction Threshold Control33
Figure 30: Extracted HPD34
Figure 31: Revolution Time, Unsuccessful Extraction34
Figure 32: HPD out of Tolerance Data35
Averaging Multiple HPD Diagrams36
Figure 33: Log Panel36
Figure 34: Averaging Hpd's37
Figure 35: Aligning HPD with Reference37
User Defined OTD Limits38
Figure 36: Averaged HPD Result38
Figure 37: Calculate OTD Parameters Window38
Figure 38: OTD Definition File39
Figure 39: Make Default File Checkbox39
View HPD Logfiles40
View (M)SSR Uplink Logfiles40
Figure 40: View HPD Logfiles Program40
Figure 41: Layer Tabs and Selectors40
User Defined OTD Limits41
Figure 42: Antenna Diagram Data in TAB-Separated File41
Troubleshooting42
Receiver Measurements43
Radar Rx Calibration43
Theory43
Getting Started43
Figure 43: Rx Calibration Software43
Software44
Figure 44: Verifying the Connections45
Figure 45: Rx Calibration Example45
Troubleshooting46
Rx Bandwidth Measurement46
Theory46
Getting Started46
Software47
Figure 46: Receiver Bandwidth Measurement Software47
Figure 47: Verifying the Connections48
Figure 48: Bandwidth Measurement Result48
Troubleshooting49
STC/DSTC Calibration49
Theory49
Getting Started49
Software50
Figure 49: STC/DSTC Calibration Software50
Figure 50: Verifying the Connections51
Figure 51: STC Measurement Result51
Sectorial STC52
Theory52
Getting Started52
Figure 52: Sectorial STC Software52
Software53
Figure 53: Set Sampling Point of Test Pulse54
Figure 54: Verifying the Connections54
Figure 55: Sectorial STC Result55
Figure 56: XYZ Graph Controls55
Sectorial DSTC56
Theory56
Getting Started56
Software56
Figure 57: Sectorial DSTC Software56
Figure 58: Set Sampling Point of Test Pulse57
Figure 59: Verifying the Connections58
Figure 60: XYZ Graph Controls58
View Rx Calibration59
Theory59
Getting Started59
Software59
Figure 61: View Receiver Calibration Software59
Figure 62: Viewing a Receiver Calibration Result60
Viewing Sectorial STC and DSTC Measurement Files61
Figure 63: Receiver Calibration File Attributes61
Figure 64: Inventory Software62
Figure 65: Load S4 File62
Figure 66: 3D View (Inventory)63
Figure 67: Example Filter by Radial64
Figure 68: Define Custom View64
Figure 69: Axis Selection65
Figure 70: Set X-Axis Scale to Logarithmic65
Figure 71: Power Vs Time View65
Downlink Measurement66
Theory66
Getting Started66
Software66
Figure 72: Uplink Software66
Figure 73: Preferences Window67
Figure 74: Uplink Program Transmitting SAM Pulses (Default Settings)67
Remote Field Monitor68
Theory68
Getting Started68
Figure 75: Remote Field Monitor Software68
Parameters69
RFM Parameters69
Radar Parameters69
Target Setup69
Software69
Figure 76: Adjust Trigger Level (RFM Setup)70
Figure 77: Define Moving Scenario71
Figure 78: Remote Field Monitor - Moving Scenario71
Out Beam Interference Generator (Fruit)72
Theory72
Getting Started72
Figure 79: Interference Generator Software72
Figure 80: Warning Message: RFA Not Found72
Software73
FRUIT Type73
FRUIT Content74
Figure 81: Recalculating Fruit Rate Limit74
Power & Rate75
Figure 82: FRUIT Content Set-Up75
Figure 83: Power & Rate Set-Up76
Rfa Transponder Interrogator77
Theory77
Getting Started77
Software77
Figure 84: RFA Transponder Interrogator Software77
Figure 85: Interrogation Controls78
Figure 86: Interrogation Type78
Figure 87: RFA Transponder Tests - Uplink Formats78
Figure 88: Specific Interrogation Fields78
Figure 89: MA Field79
Figure 90: UF24 Fields79
Figure 91: Interrogation List79
Figure 92: Reply Video Window80
Figure 93: Decoded Reply Video80
Viewing the Logged Interrogation-Reply Data81
Figure 94: Reply Video Logging81
Figure 95: Print Interrogation Tables81
Figure 96: View Transponder Test Data Software82
Figure 97: View Interrogation Results Example82
Rfa for Ads-B Main Control84
Theory84
Figure 98: RFA641 Connected to RIM782 Showing the ADS-B Plots on a Laptop84
Figure 99: Test Scenario Definition and Transponder Properties84
Figure 100: RASS-S Analysis Tools Showing ADS-B Cat 21 Data of Heavily Garbled Squitter Replies85
Figure 101: ADS-B Extended Squitter Replies with 9 Overlapping SSR Replies85
Key Specifications86
General Specifications86
Target Types86
Scenario86
Recording86
Analysis86
Software87
Trajectory Scenario Generator87
Running the Compiled Software87
Figure 102: RFA ADS-B Control Software87
Primary Target Injection88
Theory88
Calculation of External Attenuation88
General Concepts89
Figure 103: Example Test Flight89
Figure 104: Calculation of Echo Signal89
Software Principles90
Figure 105: Calculation of Target Power90
Figure 106: VPD and HPD Diagrams90
Trajectory Scenario Generator91
Scenario Replay91
Getting Started91
Scenario Selection92
Vertical Diagram Selection92
Figure 107: RFA PSR Target Generator92
Figure 108: RFA Not Found Warning Message92
Parameter Setup93
Figure 109: VPD Example93
Figure 110: Swirling Type I,II (Left) and Type III,IV (Right)94
Determining the Effect of Parameters95
Compilation of Scenario95
Figure 111: Parameter Simulator95
Figure 112: Selecting the Scenario96
Figure 113: Scenario Compilation96
Annexes98
Annex 1: Critical Parameters of SSR Antennas98
Annex 2: Uplink Connection Diagram99
Figure 114: Uplink Connection Diagram99
Annex 3: Rx, Bandwidth and STC Calibration Connection Diagram100
Figure 115: Rx, Bandwidth and STC Calibration Connection Diagram100
Annex 4: DSTC Calibration Connection Diagram101
Figure 116: DSTC Calibration Connection Diagram101
Annex 5: Sectorial STC Calibration Connection Diagram102
Figure 117: Sectorial STC Calibration Connection Diagram102
Annex 6: Sectorial DSTC Calibration Connection Diagram103
Figure 118: Sectorial DSTC Calibration Connection Diagram103
Annex 7: RFA641 Downlink Connection Diagram104
Figure 119: RFA641 Downlink Connection Diagram104
Annex 8: RFM Function Connection Diagram105
Figure 120: RFM Function Connection Diagram105
Annex 9: Out-Beam Interference Generation Connection Diagram106
Figure 121: Out-Beam Interference Generation Connection Diagram106
Annex 10: RFA Transponder Interrogator Connection Diagram107
Figure 122: RFA Transponder Interrogator Connection Diagram107
Annex 11: RFA for ADS-B Connection Diagram108
Figure 123: RFA for ADS-B Connection Diagram108
Annex 12: RFA Primary Target Injection Connection Diagram109
Figure 124: RFA Primary Target Injection Connection Diagram109
Annex 13: Configuration List110

Intersoft Electronics RFA641 - Rfa for Ads-B Main Control; Theory; Figure 98: RFA641 Connected to RIM782 Showing the ADS-B Plots on a Laptop; Figure 99: Test Scenario Definition and Transponder Properties

Table of Contents