Height Measurement Algorithm of Meter-wave Radar Network Based on Virtual Plane
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摘要: 隨著反隱身技術(shù)的發(fā)展，米波雷達(dá)憑借其反隱身、反輻射導(dǎo)彈方面的天然優(yōu)勢，再度進(jìn)入科學(xué)界的視野。但米波雷達(dá)在探測低仰角目標(biāo)過程中受多路徑效應(yīng)影響嚴(yán)重，導(dǎo)致測高結(jié)果易出現(xiàn)較大偏差，無法滿足實際需要。而組網(wǎng)雷達(dá)數(shù)據(jù)融合技術(shù)的發(fā)展為此問題找到了一個解決辦法。該文采用組網(wǎng)雷達(dá)數(shù)據(jù)融合技術(shù)，僅利用米波雷達(dá)測得的距離和方位信息實現(xiàn)了目標(biāo)的3維定位，從而解決米波雷達(dá)測高困難的問題?？紤]地球曲率的影響。該文所提出的米波組網(wǎng)雷達(dá)測高算法利用大地坐標(biāo)變換、坐標(biāo)系變換和數(shù)據(jù)變換，把各雷達(dá)數(shù)據(jù)統(tǒng)一到一個合理的工作平臺，即虛擬平面上，在該平面上對目標(biāo)進(jìn)行測高計算。對極小誤差法加以改進(jìn)，采用分辨率不高，但數(shù)據(jù)穩(wěn)定性好的方位角信息確定算法的搜索范圍；應(yīng)用分辨率較高的目標(biāo)距離信息來獲取最終的目標(biāo)經(jīng)度、緯度、海拔高度估值。由于地面強(qiáng)反射的原因，目標(biāo)的距離估值有些時候是不準(zhǔn)確的，該文設(shè)立了置信度判決準(zhǔn)則以驗證定位的有效性。通過仿真驗證，該算法具有較好的測高精度，可作為組網(wǎng)雷達(dá)行之有效的測高方法。
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關(guān)鍵詞:
- 米波雷達(dá) /
- 組網(wǎng)雷達(dá) /
- 高度測量 /
- 虛擬平面 /
- 極小誤差法
Abstract: With development of anti-stealth technology, meter-wave radar comes into sight of scientific community again due to its natural superiority of anti-stealth and anti-radiation missile. But as strongly influenced by multi- path effect in process of detecting target with low elevation angle, meter-wave radar may obtain a measured height with large deviation that unable to meet actual need. However, the development of data fusion technology in radar network finds a solution to this problem. This paper uses data fusion technology of radar network to realize three-dimensional positioning of target only with distance and azimuth information measured by meter-wave radar, so that the problem of height measurement in meter-wave radar can be well solved. In consideration of effect of earth curvature, the proposed height measurement algorithm of meter-wave radar network utilizes geodetic coordinate transformation, coordinate system transformations, and data transformation to unite all radars data into one reasonable work platform, namely virtual plane. Height measurement is conducted to target on this plane. Azimuth angle information with not high resolution ratio but good data stability is used to determine hunting zone of algorithm so as to improve minimum error method. The target distance information with high resolution ratio is used to obtain final longitude, latitude and altitude estimate of target. Sometimes target distance estimate may be inaccurate as a result of strong reflection on earth surface, according to which a confidence judgment criterion is established to verify availability of positioning. Through the simulation analysis, the proposed algorithm is verified to obtain a good accuracy in height measurement and can be regarded as an effective method in height measurement for radar network.-
Key words:
- Meter-wave radar /
- Radar network /
- Height measurement /
- Virtual plane /
- Minimum error method
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