1995年5月20日 · A test target simulator (TTS) based on a fiber-optic delay line (FODL) has been designed for realistic testing and characterizing of wideband pulsed Doppler radars. The TTS can simulate one or two targets at different radar cross sections (RCS's), different Doppler, and different ranges in the presence of uncorrelated noise or interference.

基本的思路是：k-fold CV，也就是我们下面要用到的函数 KFold ，是把原始数据分割为K个子集，每次会将其中一个子集作为测试集，其余K-1个子集作为训练集。

Figures 3 to 5 are the Miteq’s FODL performance measured by the manufacturer prior to shipping the system to NRL, including a relatively flat throughput loss from 1 to 5 GHz (Figure 3), a noise figure of 1 to 1.2 dB from 2 to 4 GHz (Fig. 4), and a gain of 30.5 dB from 2 to 4 GHz (Fig. 5).

A FODL can also be utilized to emulate range in radar testing such as depicted in Figure 2. In this scenario, a transmitted radar signal impinges on a target at a fixed range and the returned signal is passed through a FODL before processing. A fixedlength FODL can …

2015年1月14日 · FODLs have been used for several decades to test radar systems, measuring phase noise and simulating reproducible signals for outdoor range testing. These small, relatively flexible, and phase-coherent systems convert the RF signal to optical, delay it with a fiber optic line of a defined length, reconvert it to RF and retransmit it to the ...

2013年1月15日 · One of the most compact, accurate and reliable is the Fiber Optic Delay Line (FODL) method. The FODL method exploits the small size, lightweight, low loss and low drift properties of optical fiber transmission lines to create a system that replicates the channel properties that RAs face in actual operation.

FODL (fiber optic delay line) systems eliminate the need for expensive and time-consuming outdoor range tests for radio and radar systems. This white paper outlines how FODL systems’ accuracy, repeatability, and reliability can save money and time when conducting these tests and also explains for delay line core technology works.

2024年8月23日 · ODLs are fundamental in interferometric measurements, where precise path length differences are introduced to measure physical quantities like distance, displacement, or refractive index. ODLs can be used in time-resolved spectroscopy to study fast processes by delaying the probe pulse relative to the excitation pulse.

2015年12月25日 · To improve the performance of optical delay line devices, a Fast Optical Delay Line (FODL) device was designed on the basis of the principle of involutes. After analysis of the basic principle of involutes, a mathematical model was established and the delay distance formula of the designed FODL device was comprehensively derived.

The FODL-1600/3200 datalogger is capable of measuring the absolute cavity length of Fabry-Perot fiber optic transducers with great accuracy, providing highly reliable measurements. It is compatible with fiber optic transducers, including temperature, strain, pressure, displacement and …