Radar split aperture/receiver system question
时间：04-10
整理：3721RD
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I'm working on a radar design which needs to have a really close first gate (well inside the far-field), but also needs to see out to a great distance... The plan is to have an antenna aperture which we can actively configure to use a smaller section, reducing the far-field to get data for the first gate and to get the data for the furthest gate, use the entire aperture.
We can do this 2 ways (likely more).
1. Use one receiver and only transmit / receive with that appropriate part of the aperture according to range required. Basically reducing our ability to look at both sets of ranges simultaneously.
2. (and this is really my question) Use 2 receivers and transmit out of the entire antenna array simultaneously, but receive in both receivers. Use returns from the smaller section of the antenna array into one receiver for data in the near gates and combining the 2 receivers time series returns, increasing the antenna directivity, for the larger distances. This would allow simultaneous data reception for the close in gates and the largest desired range gates.
Reciprocity for one element is the same as reciprocity for the entire array? There would be no additional steering, so would there be a problem by creating 2 phase centers so far apart?
Hopefully I've explained this in an understandable manner and in a common version of English, not just my own....
TIA
We can do this 2 ways (likely more).
1. Use one receiver and only transmit / receive with that appropriate part of the aperture according to range required. Basically reducing our ability to look at both sets of ranges simultaneously.
2. (and this is really my question) Use 2 receivers and transmit out of the entire antenna array simultaneously, but receive in both receivers. Use returns from the smaller section of the antenna array into one receiver for data in the near gates and combining the 2 receivers time series returns, increasing the antenna directivity, for the larger distances. This would allow simultaneous data reception for the close in gates and the largest desired range gates.
Reciprocity for one element is the same as reciprocity for the entire array? There would be no additional steering, so would there be a problem by creating 2 phase centers so far apart?
Hopefully I've explained this in an understandable manner and in a common version of English, not just my own....
TIA