Operating Frequency Selection for Sky-wave Over-the-horizon Radar with 2-D Array
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摘要: 該文提出一種通過預(yù)測到達任務(wù)區(qū)域路徑信噪比，自適應(yīng)地為天波超視距雷達選擇工作頻點的方法。利用2維陣列的俯仰維分辨能力，克服了傳統(tǒng)方法無法從返回散射電離圖中分離多模/多徑信號的缺陷。雷達通過電離層探測設(shè)備和2維接收陣列，獲取返回散射數(shù)據(jù)、環(huán)境干擾數(shù)據(jù)和電離層狀態(tài)數(shù)據(jù)。然后利用電離層模型和狀態(tài)數(shù)據(jù)，推算各頻點對任務(wù)區(qū)域的照射路徑。運用2維自適應(yīng)波束形成抑制環(huán)境干擾噪聲，并處理返回散射數(shù)據(jù)以預(yù)測各路徑回波強度。最后計算各頻點路徑在脈沖壓縮后的信噪比，選擇信噪比最大值的頻率為最優(yōu)工作頻點。Abstract: This paper presents a method of adaptive operating frequency selection for sky-wave Over-The-Horizon Radar (OTHR) with 2-D array by predicting Signal-to-Noise Ratio (SNR) of paths to the area of interest. With the elevation resolution of 2-D array, this method overcomes the incapability of separating multipath/multimode signals for OTHR with 1-D array. For frequency selecting, firstly, sounding equipments and 2-D array record the backscattering data, environment data and ionosphere state data. Propagation paths to the area of interest are deduced for available frequencies based on the ionosphere model and state. 2-D adaptive digital beam forming is employed to suppress interferences and predict the power of echoes. Finally, the paths SNR is calculated and the frequency of the maximum SNR is selected as the optimal operating frequency.
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Key words:
- Over-The-Horizon Radar (OTHR) /
- Frequency selection /
- 2-D array
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