查询词典 direction finding

There are three parts in this paper: developing of FM type signle channel Doppler duection finder; studying of FM/AM type single channel Doppler direction finder, applying moment method for antenna on direction finding system.

主要包括以下三方面的内容：（1）FM方式单信道多普勒定向仪的研制；（2）FM/AM多方式单信道多普勒定向仪的研究；（3）测向天线的矩量法研究。

Time-Frequency parameter estimation and direction finding for nonstationary signals impinging on an antenna array over a wide frequency band (2~18GHz) is under in-vestigation, and a new method for parameter and 2-D Angle-Of-Arrival estimation of spatio-temporal undersampled LFM sources is proposed in this paper.

摘要针对宽频段(2-18GHz)内非平稳来波信号的参数估计和测向问题，提出一种时空欠采样线性调频信号参数与二维到达角联合估计方法。

The impact on the system of direction finding for the existence of baselines' obliquity is approved in actual system.

给出了相位差和基线倾角的对应关系，并在实际系统中证实了基线倾角的存在产生的相位误差对整个测向系统的影响。

The DPSK signal's influences on the performance of airborne radio compass including bandwidth, direction finding and beacon recognition, were analyzed in detail.

分析了DPSK调制对现有机载无线电罗盘的工作带宽、定向及台识别等性能指标的影响。

The simulation results are given that, the beacon identification function and the direction finding of the radio compass cannot be influenced by DPSK modulation, and the synchronization between DPSK and the audio frequency signal is an effective approach to overcome the AM's influences on the DPSK demodulation.

仿真结果表明，DPSK不会对现有机载无线电罗盘的基本功能产生影响，利用差分数据信号与音频信号进行同步的方法进行"北斗二"差分数据传播可以有效克服AM调制对DPSK解调的影响。

Considering the technology difficulty in satisfying direction finding accuracy and resolving angle ambiguity,the same time in defined space for ultra-band antiradiation missile seeker,theories of direction finding by phase interferometer and resolving angle ambiguity by double base line are simply introduced.

针对反辐射导弹导引头超宽带测向系统中，在较小的体积内难以同时保证测向精度和解模糊的技术难题，介绍了相位干涉仪测向原理和参差双基线解模糊方法及其原理，并结合反辐射导弹导引头的具体应用情况，提出了一种基于虚拟基线解模糊方法。

The unwrapping phase ambiguity algorithm of N-baseline direction finding system including N-1 constant ratio double-baseline direction-finding subsystem is studied.

研究了由N-1个等比值双基线系统组成的N基线测向系统的相位解模糊算法。

In order to gather rapidly when GPS is forbidden,a high-performance direction finding system is needed,and key part of the system is direction-finding receiver.

为了实现空降兵在禁用GPS条件下的快速集结，需要一种高性能的测向系统，接收机是测向系统的关键部分。

Compared with traditional wideband signal sub-space direction finding algorithms,the proposed algorithm does not need pre-estimate of direction of arrival.

与通常的信号子空间宽带测向算法相比，本文提出的算法不需要对波达方向进行预估计。

For chirp radiator direction-finding using an ARM interferometer seeker, the cause of the direction-finding error using traditional direction angle estimation is studied, and the relationship between the direction-finding error and the integration time is analyzed, especially for the boundary condition that the integration time of phase discriminators gets the maximum value.

针对ARM干涉仪导引头对chirp信号辐射源的测角问题，从几何关系与信号分析两方面揭示了传统方向角估计方法产生测角误差的机理，分析了干涉仪测角误差随鉴相器积分时间变化的关系，重点对积分时间最长这一极端情况开展研究。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。