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)

APPENDIX

h. Positioning of sample gates: Fixed or slaved to radar. i. Gate spacing: 50 - 200 nsec.

J. IF frequency: To match the radar. k. IF bandwidth: 10 MHz minimum.

4.3.2 Instrumentation operating procedures. The general operating procedures supplied with the RCS processor and other instrumentation shall be utilized. Additionally, the procedures of 4.3.2.1 or 4.3.2.2 of this appendix shall be used depending on the type of test being conducted as specified in the test plan or associated specification.

4.3.2.1 Procedures for collecting data on chaff immediately behind the aircraft. For those cases where the chaff is measured immediately behind the aircraft, the following sample procedures can be used:

a. Sample gate number 2 shall be used to track the aircraft. When a beacon track is available, the processor gates shall be slaved to the beacon range gate. Where a beacon track is not available, the operator shall choose either the radar slaved mode or processor track mode - whichever best meets the requirements.

b. A minimum of fifteen sample gates shall be used to collect RCS data. One gate shall be in front of the aircraft, one on the aircraft, and the remaining gates behind the aircraft. Data shall be taken at all gates starting within 2 0.5 seconds before chaff is first deployed during a run and ending Just about one second after the chaff has passed through the fifteenth gate.

4.3.2.2 Procedures for collecting data on old chaff. For those cases where measurements are made on old chaff, data shall be taken with the gates stationary and positioned over the chaff cloud. This may require repositioning the gates when the cloud is very long.

4.4. RCS data processing.

4.4.1 Required data processing. The RCS data on permanent storage shall be processed as follows for each test.

4.4.1.1 Select data. Data selection shall be performed by determining the time period when the chaff is in the radar resolution cell being measured and processing only these data. The shadow graph requirement of 4.4.1.2 of this appendix shall be used to aid in the selection of good data.