用于射电干涉测量的2-20 GHz模拟滞后关联函数
A 2-20 GHz Analog Lag-Correlator for Radio Interferometry
摘要：
本文介绍了一个用于天文干涉测量的2-20 GHz连续带模拟滞后关联函数的设计和测试。关联函数已被设计为未来使用的原型单基线干涉仪在185-275 GHz的操作。该设计采用宽带威尔金森分压器树，在氧化铝基板上实现集成薄膜电阻，以及定制的宽带InGaP/GaAs吉尔伯特单元乘法器。原型关联函数已经过充分的实验室测试，连同必要的读出电子采集的输出信号。这些测量的结果表明，关联函数的响应在整个频带内表现良好。噪声行为的调查也表明，该系统的信号噪声不受关联函数性能的限制。
英文摘要：
We present the design and testing of a 2-20 GHz continuum band analog lag correlator with 16 frequency channels for astronomical interferometry. The correlator has been designed for future use with a prototype single-baseline interferometer operating at 185-275 GHz. The design uses a broadband Wilkinson divider tree with integral thin-film resistors implemented on an alumina substrate, and custom-made broadband InGaP/GaAs Gilbert Cell multipliers. The prototype correlator has been fully bench-tested, together with the necessary readout electronics for acquisition of the output signals. The results of these measurements show that the response of the correlator is well behaved over the band. An investigation of the noise behaviour also shows that the signal-to-noise of the system is not limited by the correlator performance.
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