passive ranging Doppler

简明释义

无源测距多普勒雷达

英英释义

例句

1.In underwater navigation, passive ranging Doppler helps submarines avoid detection.

在水下导航中，被动测距多普勒帮助潜艇避免被发现。

2.Using passive ranging Doppler, scientists can monitor changes in ocean currents.

科学家可以使用被动测距多普勒监测海洋洋流的变化。

3.Researchers employed passive ranging Doppler methods to track the movement of glaciers.

研究人员采用被动测距多普勒方法来追踪冰川的运动。

4.The satellite used passive ranging Doppler technology to determine its distance from Earth.

这颗卫星使用被动测距多普勒技术来确定其与地球的距离。

5.The radar system utilized passive ranging Doppler to measure the speed of approaching aircraft.

雷达系统利用被动测距多普勒来测量接近飞机的速度。

作文

In the field of radar and sonar technology, various methods are employed to determine the position and movement of objects. One such method is known as passive ranging Doppler. This technique is particularly useful in scenarios where active detection methods, such as emitting signals, may not be feasible or desirable. Understanding how passive ranging Doppler works can provide insights into its applications and advantages over other methods.To begin with, passive ranging Doppler relies on the detection of signals that are already being emitted by a moving object. Unlike active systems that send out waves and listen for their echoes, passive systems simply observe the energy that is naturally present in the environment. This can include sounds from marine life, radio waves from aircraft, or any other form of emissions. The key to this method lies in its ability to analyze the frequency shifts of these signals as they are affected by the Doppler effect.The Doppler effect describes the change in frequency or wavelength of a wave in relation to an observer moving relative to the source of the wave. When an object moves toward a detector, the frequency of the emitted signal increases, while it decreases when the object moves away. By measuring these frequency changes, a passive ranging system can determine not only the speed of the object but also its distance from the detector. This is where the term passive ranging Doppler becomes significant, as it encapsulates both the passive nature of the detection and the use of Doppler principles.One of the primary advantages of passive ranging Doppler is its stealthiness. In military operations, for example, using active radar can reveal a ship's or aircraft's position to adversaries. In contrast, a passive system remains undetected, allowing for covert surveillance and tracking. This characteristic makes passive ranging Doppler an invaluable tool in intelligence gathering and reconnaissance missions.Moreover, passive ranging Doppler systems are often less expensive and easier to deploy than their active counterparts. They do not require complex transmitting equipment, which can be cumbersome and costly. Instead, they can utilize existing ambient signals, making them more adaptable to various environments. For instance, marine biologists can use passive ranging Doppler to study fish populations by analyzing the sounds they produce without disturbing their natural behavior.However, there are challenges associated with passive ranging Doppler techniques. The effectiveness of these systems depends heavily on the availability and clarity of the signals being monitored. In environments with high levels of noise or interference, distinguishing the target signals can be difficult. Additionally, accurately calculating the distance to the object can be complex, especially if multiple sources of emissions are present.In conclusion, passive ranging Doppler represents a sophisticated approach to tracking and analyzing object movements without the need for active engagement. Its ability to operate stealthily and economically makes it a preferred choice in many fields, from military applications to environmental studies. As technology continues to advance, the methods associated with passive ranging Doppler will likely evolve, leading to even more innovative uses and improvements in accuracy and efficiency.

在雷达和声纳技术领域，采用多种方法来确定物体的位置和运动。其中一种方法被称为被动测距多普勒。这种技术在主动探测方法（例如发射信号）不可行或不理想的情况下特别有用。了解被动测距多普勒的工作原理可以提供对其应用和相对于其他方法的优势的见解。首先，被动测距多普勒依赖于检测已经由移动物体发出的信号。与发送波并监听回声的主动系统不同，被动系统仅观察环境中自然存在的能量。这可以包括来自海洋生物的声音、飞机发出的无线电波或任何其他形式的发射。这种方法的关键在于能够分析这些信号的频率变化，因为它们受到多普勒效应的影响。多普勒效应描述了波的频率或波长相对于与波源相对移动的观察者的变化。当一个物体朝向探测器移动时，发射信号的频率增加，而当物体远离时，频率降低。通过测量这些频率变化，被动测距系统不仅可以确定物体的速度，还可以确定其与探测器的距离。这就是被动测距多普勒这一术语的重要性所在，因为它同时概括了探测的被动性质和多普勒原理的使用。被动测距多普勒的主要优势之一是其隐蔽性。例如，在军事行动中，使用主动雷达可能会向敌方透露船只或飞机的位置。相比之下，被动系统保持未被探测，从而允许进行秘密监视和跟踪。这一特性使得被动测距多普勒成为情报收集和侦察任务中的宝贵工具。此外，被动测距多普勒系统通常比其主动对应物更便宜且更易于部署。它们不需要复杂的发射设备，这可能笨重且成本高昂。相反，它们可以利用现有的环境信号，使其更适应各种环境。例如，海洋生物学家可以使用被动测距多普勒来研究鱼类种群，通过分析它们所产生的声音而不干扰其自然行为。然而，与被动测距多普勒技术相关的挑战也存在。这些系统的有效性在很大程度上取决于可监测信号的可用性和清晰度。在噪声或干扰水平较高的环境中，区分目标信号可能会变得困难。此外，准确计算物体的距离可能会很复杂，尤其是在存在多个发射源的情况下。总之，被动测距多普勒代表了一种复杂的方法，可以在不需要主动参与的情况下跟踪和分析物体运动。其隐蔽和经济的操作能力使其在许多领域中成为首选，从军事应用到环境研究。随着技术的不断进步，与被动测距多普勒相关的方法可能会不断演变，导致更具创新性的用途以及在准确性和效率方面的改进。