1.6 Inferring Radar Capabilities from Observed Signal Parameters 从测量参数推断雷达性能

 

The basic function of ELINT is to determine the capabilities of the radar, so that decisions can be made as to what threat it poses. Radar functions are generally to make measurements of the range, velocity, and direction of targets of interest to the radar. Consider radar measurement of target range. A simple pulsed radar has a maximum unambiguous range measurement capability given by the speed of light multiplied by half of the pulse repetition interval (PRI). Therefore, if the PRI is measured, the maximum unambiguous range can be determined. This provides a clue to what detection range the radar achieves. It is to the radar’s advantage to use the shortest PRI commensurate with the range measurement capabilities necessary to perform the radar’s mission. True assessment of radar maximum range measurement capability requires determining all of the quantities in the radar range equation. Some of these are impossible to know through ELINT (such as the required signal level at the radar receiver). Therefore, intelligent estimates or knowledge from other sources must be used.

 

ELINT接收机的作用就是根据接收的电磁信号测量感兴趣的参数，进而推断出这些电磁辐射源的作战性能。比如对于一部简单的脉冲雷达来说，如果测量出它的脉冲重复间隔（PRI），就可以判断该部雷达的最大探测距离了。当然还有一些信息是无法从ELINT接收机获取的，需要根据多种情报源进行综合研究。

 

  Of course, inferring radar capabilities becomes very complicated as the radar becomes more complex. Nevertheless, it is always true that the radar’s transmitted waveform determines the ambiguity diagram for the radar. ELINT can probe the character of the ambiguity function by a close examination of the radar’s transmitted signal. This brief outline of the procedures useful in inferring radar capabilities from ELINT is intended to point out the motivation for the signal analysis techniques described in Chapters 7, 8, and 10 through 15.

 

随着雷达技术的发展，对雷达性能的判断变得越来越复杂和困难。但不管怎样，雷达信号始终是雷达工作性能的重要体现。

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