In this paper, environmental tests were conducted with a MEMS (micro-electro mechanical system) oscillator, which is known to be robust under harsh environmental conditions, and comparisons with the existing TCXO (temperature-controlled crystal oscillator) were conducted. And the results of the environmental tests of a GNSS receiver equipped with the MEMS oscillator were compared with the test results of the existing GNSS receiver. The oscillator undergoes considerable performance variation due to the surrounding environments, and in particular, a TCXO, which improves the frequency stability during temperature changes, is widely used in most GNSS receivers. The GNSS receiver for KSLV-II also uses the TCXO type, with its performance evaluated through environmental tests in which physical loads are applied, such as high and low temperatures, vibration, and pyrotechnic shocks. The TCXO in use met the specification in most environmental tests, but the frequency output from the TCXO changed abruptly at the instant of a pyrotechnic shock impact causing loss of signal tracking. But the GNSS receiver with the MEMS oscillator is not affected under the pyrotechnic shock test and the performance does not degrade under the temperature test and vibration test showing the feasibility of the MEMS oscillator for use in the GNSS receiver.

中文翻译：

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根据环境测试研究 MEMS 振荡器对 GNSS 接收器的适用性

在本文中，使用 MEMS（微机电系统）振荡器进行环境测试，该振荡器在恶劣的环境条件下具有稳健性，并与现有的 TCXO（温控晶体振荡器）进行了比较。并将配备MEMS振荡器的GNSS接收器的环境测试结果与现有GNSS接收器的测试结果进行比较。由于周围环境的影响，振荡器的性能会发生相当大的变化，特别是在温度变化期间提高频率稳定性的 TCXO 被广泛用于大多数 GNSS 接收器。用于 KSLV-II 的 GNSS 接收器也使用 TCXO 型，其性能通过应用物理负载（例如高温和低温）的环境测试进行评估，振动和烟火冲击。使用中的 TCXO 在大多数环境测试中都符合规范，但在烟火冲击影响的瞬间，TCXO 的频率输出突然变化，导致信号跟踪丢失。但带有 MEMS 振荡器的 GNSS 接收器在烟火冲击测试下不受影响，在温度测试和振动测试下性能没有下降，这表明 MEMS 振荡器用于 GNSS 接收器的可行性。