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RADAR SPECTRUM ENGINEERING CRITERIA (RSEC) A Comprehensive Review. ROBERT L. HINKLE. Alion Science and Technology 185 Admiral Cochrane Drive Annapolis, MD 21401 . PURPOSE.

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RADAR SPECTRUM ENGINEERING CRITERIA(RSEC)A Comprehensive Review

ROBERT L. HINKLE

Alion Science and Technology

185 Admiral Cochrane Drive

Annapolis, MD 21401


Purpose l.jpg
PURPOSE

● Ensure an acceptable degree of electromagnetic compatibility among radar systems, and between such systems and those of other radio services sharing the frequency spectrum.

● Promote efficient use of the spectrum.


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REASON FOR RSEC REVIEW

●Last major review of RSEC conducted in 1973-1977 time frame

● New generation of radar systems more complex

 Waveform characteristics change pulse-to-pulse

 Dynamic PRF pulse trains

● Trend toward solid state output devices

● Increase in interference from radars

● ITU-R Working Party 8B (Radiodetermination) has set up a radar group to investigate feasibility of more stringent emission masks than contained in ITU-R Recommendation SM1541, Annex 8, by 2006 Radiocommunication Assembly meeting.

 Work Program developed by ITU-R Working Party 8B


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APPROACH

 Develop a software program that will provide current and optional emission masks.

 Identify, through measurements, emission characteristic of radars with various types of output devices, filters and antennas.

  • Apply software program (emission masks) to measured emission characteristics to assess feasibility of establishing a more spectrum efficient emission mask.

  • Engage the radar manufacturers and radar output device manufacturers to identify state-of-the-art capabilities.

  • Through the IRAC/TSC, in coordination with Federal agencies, reach agreement regarding draft revised emission masks for future radar systems. This coordination is in progress.


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RADAR CHARACTERISTICS ADDRESSED IN THE RSEC

● Emission bandwidth (40 dB)

● Emission levels

● Tuning Range

● Antenna patterns

● Frequency tolerance

● Receiver selectivity

● Image and spurious rejection

● Local-oscillator radiation



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AIRPORT SURVEILLANCE RADAR(Klystron Output device)

(radiated measurement in far field of antenna)


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WEATHER RADAR(Klystron output Device)

(radiated measurement in far field of antenna)


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RADIONAVIGATION RADAR (Coaxial Magnetron WO Filter)

(radiated measurement in far field of antenna)


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RADIONAVIGATION RADAR(Coaxial Magnetron With Filter)

(radiated measurement in far field of antenna)


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RADIONAVIGATION RADAR(Coaxial Magnetron, Slotted Array Antenna)

(radiated measurement in far field of antenna)


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OVERVIEW OFRSEC CHANGES BEING CONSIDERED

● Add the following to Group A (Exempt from RSEC).

 Maritime Radionavigation 2900-3100 MHz

 Radionavigation 5460-5650 MHz

 Aeronautical Radionavigation 15.4-15.7 GHz

These radars are, for the most part, not under Government control and are widely used by the private sector.


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OVERVIEW OF

RSEC CHANGES BEING CONSIDERED

● Group B (Criteria B)

 Retain 40 dB bandwidth formulas

 Assess feasibility of roll-off slopes of 30/40 dB per decade

 Propose to change X (dB) floor level to:

X (dB) =10LogP(Watts) + 30

Where: 60 dB ≤ X (dB) ≤ 80 dB

Current RSEC (X) level is dependent on the power, pulse width, and prf of the radar (see section 5.5.2 of NTIA Manual of Regulations & Procedures for Federal Radio Frequency Management).


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OVERVIEW OF

RSEC CHANGES BEING CONSIDERED

●Group C (Criteria C)

 Retain 40 dB bandwidth formulas

 Assess feasibility of roll-off slopes of 30/40 dB per decade

 Propose to change X (dB) Level to 60 dB for near term, and consider phasing in X (dB) floor of:

X (dB) =10LogP(Watts) + 30

Where: 60 dB ≤ X (dB) ≤ 80 dB

Current RSEC (X) level is dependent on the power, pulse width, and prf of the radar (see section 5.5.3 of NTIA Manual of Regulations & Procedures for Federal Radio Frequency Management).


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OVERVIEW OF

RSEC CHANGES BEING CONSIDERED

● Group D (Criteria D)

 Retain all of Criteria D except change harmonic levels to 80 dB

 New solid state radars can not meet Criteria D without filters

● Group E (Criteria E)

 No proposed changes


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RELATED ITU-R ACTIVITIES

  • Proposed Formation of JRG 1A/1C/8B

  • Rec. ITU-R SM.1541: Out-of-Band emissions

  • Rec. ITU-R M.1314: Methods to reduce radar unwanted emissions

  • Recommendation ITU-R M.1177: Techniques for measurement of radar unwanted emissions