MIL-STD-469 Radar Engineering Interface Requirements, Electromagnetic Compatibility See Notice 1 For Replacement InformationThis standard establishes the engineering interface requirements to control the electromagnetic emission and susceptibility characteristics of all new military radar equipment and systems operating between 100 megahertz MHz, and 100 gigahertz GHz, to ensure EMC in all intended operational environments, and to conserve the frequency spectrum available to military radar systems.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23 - 24 - 25 - 26 - 27 - 28 - 29 - 30 - 31 - 32 - 33 - 34 - 35 - 36 - 37 - 38 - 39 - 40 - 41 - 42 - 43 - 44 - 45 - 46 - 47 - 48 - 49 - 50 - 51 - 52 - 53 - 54 - 55 - 56 - 57 - 58 - 59 - 60 - 61 - 62 - 63 - 64 - 65 - 66 - 67 - 68 - 69 - 70 - 71 - 72 - 73 - 74 - 75 - 76 - 77 - 78 - 79 - 80 - 81 - 82 - 83 - 84 - 85 - 86 - 87 - 88 - 89 - 90 - 91 - 92 - 93 - 94 - 95 - 96 - 97 - 98

MIL-STD-469B

5.3.5 Special EMC requirements, group D radars. Radar systems in the 2700 to 2900 MHz ban d (Group D) which operate in close proximity to other equipment in this band or operate in areas specified in Annex D of the NTIA M anual shall be designed and constructed to permit, without modification to the basic equipment, field incorporation of system EMC provisions. These provisions include the following requirements and recommendations:

a. Emission levels. The radar emission levels at the antenna input shall be not greater than the values obtainable from the curves in table V. At the frequency ±B ( 40 dB)12 displaced from Fo, the level shall be at least 40 dB below the maximum value. Beyond the frequencies ±B ( 40 dB)12 from Fo, the equipment shall have the capability to achieve at least the 80 dB per decade roll-off lines of table V. The emission levels shall be below the a ppropriate dB per decade roll-off lines of table V down to a x dB level that is 80 dB below the maximum power density.

b. Radar system PRF. The radar system shall be designed to operate with an adjustable puls e repetition frequency(s) (PRFs), with a nominal difference of plus or minus 1 percent (minimum). This will permit the selection of PRF's to allow certain types of receiver interference suppression circuitry to be effective.

c. Receiver interference suppression circuitry. Radar systems in this band shall have provision s incorporated into the system to suppress pulsed inter ference. The following information is intended for use as an aid in the design and development of receiver signal processing circuitry or software to suppress ac pulsed interference. A description of the parametric range of the expecte d environmental signal characteristics at the receiver IF output is:

Peak interference-to-noise ratio: < 50 dB Pulse width: 0.5 to 4.0 sec

PRF: 100 to 2000 pps

5.4 Antenna limits. The radar antenna characteristics shall s atisfy the requirements as specified in table

VIII.

5.5 Receiver limits.

5.5.1 Receiver acceptance bandwidth. The radar receiving system required acceptance bandwidths shall be as specified in table IX.

5.5.2 Receiver susceptibility characteristics. The rejection of signals outside the required receive r acceptance bandwidth shall be equal to or greater than the values as specified in table IX for the designated radar category and group.

5.5.3 Receiver tunability. The tunability of the radar receiver shall be commensurate with that of the associated radar transmitter. Requirements for radar transmitters shall be as specified in 5.3.4.