MIL-STD-2071 Testing Of Chaff Radar Cross-SectionThis standard establishes the procedures, requirements, and instructions for testing chaff payloads under flight conditions to determine compliance with the associated system performance or detail specification specified in the contract.

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MIL-STD-2071A(AS)

c. 35 GHz specifications:

Frequency 35 GHz 0.2 GHz PRF 500 - 1000 Hz Pulsewidth 0.25 s

Bandwidth 10.0 MHz

Duty cycle 0.0008

Polarization horizontal

4.3.1.1 Radar parameters. The effective radiated power of the radars shall provide for calibration on a sphere with a 10-to-1 signal-to-noise ratio and to make measurements on a one square meter target at the maximum drop range as specified in the detailed test plan. The radars shall have non-scanning antennas, stable power, and frequency characteristics.

4.3.2 Instrumentation. Instrumentation shall include equipment that shall measure and process RCS values for each radar pulse.

4.3.2.1 Measuring instrumentation. Measuring instrumentation shall meet the requirements detailed in 4.3.1 of the appendix of this standard.

4.3.2.2 Processing instrumentation. The data processing equipment shall provide the outputs and formats detailed in section 4.4.1 of the appendix of this standard and figures 3 through 6.

4.3.3 Aircraft and dispenser installation. The type(s) of aircraft and the location(s) of the dispensers shall be specified for any test. The type(s) of aircraft and dispenser location(s) used for testing preproduction, initial production, and production chaff shall have an established data base as described in 4.3.

4.4 Standard conditions. All airborne chaff measurements used for acceptance test shall comply with the test conditions as specified by this standard and the associated specification.

4.4.1 Weather. Unless otherwise specified in the associated specification, all flight tests shall be conducted with turbulence intensity not exceeding occasional light chop, as described in the DoD Flight Information Publication, with flight visibility of three statute miles or better, and cloud clearances of 1000 feet above, no clouds below the dispense altitude. In all cases, the weather shall be such that it will allow for flight under visual meteorological conditions (VMC). (See 6.2)

4.4.2 Aspect angle. The aspect angle, the angle between the actual boresight and the flight path, during the chaff measurements shall be between 5 and 20 degrees and shall not vary more than 8 degrees on any one test run.