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Part by pointing to the value of the factor array directivity index for determining the base


O, dBI23OISm1'I5. ∞ IO. 6I comparison theory calculation and accurate calculation of approximate values of D. Value can be seen. Kiss between the two sets is better, that that principle of seeking to use part of the value of the directivity index arrays of this approximation is correct. From the experimental treatments listed in the table with the calculated values can be seen. Either low frequency or high frequency. They are very kiss Taiwan This is because we measured directivity, both the main lobe or side lobes. Are very close to the theoretical value. This shows that the value of demand from some of the value matrix method is effective. Listed in the table comparison (DIJ. and linear array of DI value can know. Although the request (R). (Or (}.} Package when the ancient use of linear array oriented in the plane (ie yoz plane) within the measurement directivity. but (). is not a line array directivity factor. Therefore, with baffle line array directivity factor of the level of wells is not the array directivity factor and the vertical directivity factor of the geometric mean. 4 Conclusion based on an international array of testing, when the measured directivity of the main lobe directivity theory similar to the sidelobe difference is large,[link widoczny dla zalogowanych], if the document is still used by 【3】 way to estimate the main lobe beam width will of the larger errors. and it is difficult to reflect the performance of arrays. This practice (theoretical calculation and the actual grab I treatment) show that the demand by some of the value of the gross value of the sum method can more objectively reflect the actual real arrays performance. (under special | '27) of a clutter of a smaller l3. So. high smoothing coefficient and a good combination of multi-channel consistency. on the sonar 1. as a self-important significance. It means that time and Spaces are available throughout the range of uniform noise background, which is a fixed threshold. from the disturbance exists in the target sentence Sheng created favorable conditions. 4 high-performance,[link widoczny dla zalogowanych], high stability and automatic gain control circuit structure of the circuit except Simple, good performance, but also easy to adjust the characteristics of a carefully selected components in the premise, the entire circuit is a potentiometer adjustment with only the DC amplifier K.'s put a lot of. to obtain the Figure 3 and Table I shows the control characteristics and multi-channel consistency. to the same control circuit made into two, just a little adjustment on the individual components, you can get high smoothness, high uniform stability of the automatic gain control circuit. has produced a two-level circuit to achieve Main indicators are as follows: (1) Dynamic Range: O.7-7OOmV (60dB) (2) Smoothing factor: population, 100 (room temperature) (3) Consistency Stability: at different temperatures, when gradually from 0.7mV changes to 700mV, the measured s values listed in Table 2. Wrap 2 s-values at different temperatures T / (℃】 I605ol2oIol-, o/lib10.32o +17 Iof0.6710.99 these indicators, the general circuit is very difficult to achieve. The circuit is especially suitable platform used to control the performance requirements of high temperature harsh environment sonar and electronic circuits. (on the next power of 13) Of particular note are: a complex array directivity index LMH well not two mutually perpendicular sub-matrix (often called Figure seeking technetium directivity factor of the data processing, in particular, has been Songlan Ying, Tang Liang Yu, HE Yong-science and other comrades to assist. In this special to thank them. 5 [1】 IJw Horton j Fung Ping boring translation. acoustic take principle. Beijing. the defense industry in the film Mrs .1965 f2IB Fun lIothedlrecg ~ l mouth Ir.d ,[link widoczny dla zalogowanych], ll ・ B ・ ・ m base 6po -., PacketH Ⅱ po. xtp. Ⅱ aH female ltf ● H-ruo 'Dan eet6OnO_c Parker called zOTaHq puuee and .. Io6po | oJ-eRH_ arsenic ... r-Ipoix,[link widoczny dla zalogowanych], ot-q ● oI Dan AH ~ ONm, r. .. 0yJoef-r: ... ..; 0; a 27 -

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