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空军为着满足其各种先进战斗机的需要已提出建立精密惯性导航及高准确度定时频率源系统。作者曾提出,采用改进的多频环形激光陀螺仪(RLG)同时作为陀螺仪和钟的方法。这种部件采用附加了检波器的多频环形激光陀螺仪(RLG)。检波器用以检出两拍频信号(各为约582MHz),再经必要的电子线路以产生5MHz的钟信号。激光钟具有体积小,价格低和具有冗余的特点。对于已配备了RLG导航仪的飞机,只需另加检波及输出的电子部件,就可实现钟的功能。RLG导航仪在附加上数据采集和设备维修这些设备后所增加的费用是很少的。由于在三轴导航仪中配备了三个钟,因而具有冗余的特性。本文是去年频率控制年会上所介绍文章的继续。所采用的环形激光器是Raythton RB-25型非平面He-Ne激光器,其光程为25.69cm。去年报道的最佳数据是从作为工作样机的RLG的68号激光器获得的。估计两个主要误差源为(1)由海森伯格不确定性原理所决定的量子极限;(2)法拉第转子引起的频移中由温度引起的漂移。现在的工作并不是设法通过增加激光功率或提高腔Q来减小量子极限,因为改善量子极限,需要研制新的激光器。由于经费有限,目前尚未开展这方面的工作。现在主要是致力于改进法拉第转子的频移随温度而变化的特性。在新的电子系统中采用一个检波器测量顺时针拍频,另一个检波器测量反时针拍频,将两拍频相加后再分频至5MHz。环形激光陀螺钟是一种传递型频标,因而在使用前必须调节到参考频率源的频率上。现在可作为参考的方法有:全球定位系统(GPS)、联合作战信息发布系统(JTIDS)、雷达技术及直接与一时间标准相连接等方法。
To meet the needs of its various advanced fighter jets, the Air Force has proposed the establishment of precision inertial navigation and a high-accuracy timing frequency source system. The authors have proposed the use of an improved multi-frequency ring laser gyro (RLG) as both a gyroscope and a clock. This part features a multi-frequency ring laser gyro (RLG) with an attached detector. The detector detects two beat signals (about 582 MHz each) and then passes through the necessary electronics to produce a 5 MHz clock signal. Laser clock with small size, low price and redundant features. For aircraft already equipped with the RLG Navigator, the bell’s function can be achieved simply by detecting and outputting the electronic components. The addition of RLG navigators to these devices, with the addition of data acquisition and equipment maintenance, adds little cost. Due to the three-axis navigator equipped with three clocks, and therefore has the characteristics of redundancy. This article is a continuation of the article presented at the Annual Conference on Frequency Control last year. The ring laser used was a Raythton RB-25 non-planar He-Ne laser with a light path of 25.69 cm. The best data reported last year was obtained from the RLG 68 Laser as a working prototype. The two main sources of error are estimated as (1) the quantum limit determined by Heisenberg’s uncertainty principle, and (2) the temperature-induced drift in the frequency shift caused by the Faraday rotator. The job now is not to try to reduce the quantum limit by increasing the laser power or increasing the cavity Q, since improving the quantum limits requires the development of a new laser. Due to limited funding, no such work has yet been carried out. It is now mainly concerned with improving the Faraday rotator frequency shift with temperature characteristics. In the new electronic system using a detector to measure clockwise beat frequency, another detector measures anti-clockwise beat frequency, the two beats frequency and then divided to 5MHz. Ring laser gyro clock is a transfer-type frequency standard, and therefore must be adjusted to the frequency of the reference frequency source before use. Now available as a reference methods are: global positioning system (GPS), Joint Operations Information Release System (JTIDS), radar technology and directly connected with a time standard and other methods.