ImageVerifierCode 换一换
格式:PDF , 页数:3 ,大小:173.14KB ,
资源ID:791766      下载积分:10000 积分
快捷下载
登录下载
邮箱/手机:
温馨提示:
如需开发票,请勿充值!快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。
如填写123,账号就是123,密码也是123。
特别说明:
请自助下载,系统不会自动发送文件的哦; 如果您已付费,想二次下载,请登录后访问:我的下载记录
支付方式: 支付宝扫码支付 微信扫码支付   
注意:如需开发票,请勿充值!
验证码:   换一换

加入VIP,免费下载
 

温馨提示:由于个人手机设置不同,如果发现不能下载,请复制以下地址【http://www.mydoc123.com/d-791766.html】到电脑端继续下载(重复下载不扣费)。

已注册用户请登录:
账号:
密码:
验证码:   换一换
  忘记密码?
三方登录: 微信登录  

下载须知

1: 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。
2: 试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。
3: 文件的所有权益归上传用户所有。
4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
5. 本站仅提供交流平台,并不能对任何下载内容负责。
6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。

版权提示 | 免责声明

本文(ITU-R M 1466-2000 Characteristics of and Protection Criteria for Radars Operating in the Radionavigation Service in the Frequency Band 31 8-33 4 GHz《工作在31 8-33 4GHz频段的用于无线电导航的雷达的保护.pdf)为本站会员(花仙子)主动上传,麦多课文库仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文库(发送邮件至master@mydoc123.com或直接QQ联系客服),我们立即给予删除!

ITU-R M 1466-2000 Characteristics of and Protection Criteria for Radars Operating in the Radionavigation Service in the Frequency Band 31 8-33 4 GHz《工作在31 8-33 4GHz频段的用于无线电导航的雷达的保护.pdf

1、Rec. ITU-R M.1466 1 RECOMMENDATION ITU-R M. 1466 CHARACTERISTICS OF, AND PROTECTION CRITERIA FOR RADARS OPERATING IN THE RADIONAVIGATION SERVICE IN THE FREQUENCY BAND 31.8-33.4 GHz (Question ITU-R 226/8) (2000) The ITU Radiocommunication Assembly, considering that antenna, signal propagation, target

2、 detection, and large necessary bandwidth characteristics of radar to a achieve their functions are optimum in certain frequency bands; b) mission of the system and vary widely even within a band; that the technical characteristics of radars operating in the radiodetermination service are determined

3、 by the c cannot be accepted; 4 been removed or downgraded since WARC-79; e that some ITU-R technical groups are considering the potential for the introduction of new types of systems (e.g., fixed wireless access and high density fixed and mobile systems) or services in bands between 420 MHz and 34

4、GHz used by radars in the radiodetermination service; I) radiodetermination service are required to determine the feasibility of introducing new types of systems; s radiodetermination service and systems in other services; that the radionavigation service is a safety service as specified by RR No. S

5、4.10 and harmful interference to it that considerable radiolocation and radionavigation spectrum allocations (amounting to about 1 GHz) have that representative technical and operational characteristics of systems operating in bands allocated to the that procedures and methodologies are needed to an

6、alyse compatibility between radars operating in the h) that WRC-97 requested that the ITU-R conduct studies to determine what criteria would be necessary forsharing between stations in the fiied service and stations in the other services to which the frequency band 3 1.8-33.4 GHz is allocated; j tha

7、t the frequency band 3 1.8-33.4 GHz is allocated on a primary basis to the fiied and radionavigation services and that portions of the band are allocated on a primary basis to the space research (deep space) and intersatellite services, recommends 1 in Annex 1 be considered representative of those o

8、perating in the frequency band 3 1.8-33.4 GHz; 2 operating in the radiodetermination service with systems in other services; 3 that the criterion of interfering signal power to radar receiver noise power level, I/N, of -6 dB be used as the required protection level for the radionavigation radars, an

9、d that this represents the net protection level if multiple interferers are present. NOTE 1 - This Recommendation will be revised as more detailed information becomes available. that the technical and operational characteristics of the radars operating in the radionavigation service described that R

10、ecommendation ITU-R M.1461 be used as a guideline in analysing compatibility between radars 2 Parameter Rec. ITU-R M.1466 RadarNo. 1 Radar No. 2 ANNEX 1 Fixed frequency Tunes continuously across 31.8-33.4 GHz Technical and operational characteristics of radars operating in the radionavigation servic

11、e in the frequency band 31.8-33.4 GHz Fixed frequency or frequency hopping Operates in either mode on one of 9 discrete channels spaced 100 MHz apart (32.2-33 GHz) 1 Introduction Emission type RF emission bandwidth (MHz) The radionavigation service operates worldwide on a primary basis in the freque

12、ncy band 31.8-33.4 GHz. This Annex presents the technical and operational characteristics of representative radars operating in the radionavigation service in this frequency band. Unmodulated pulses 37 17 (instantaneous) 117 (hopping) 2 Technical characteristics of radionavigation systems in the 31.

13、8-33.4 GHz frequency band Receiver IF bandwidth (-20 dB) (MHz) Receiver noise figure (dB) The technical parameters of two radionavigation radars operating in the band 31.8-33.4 GHz are presented in Table 1. Both systems are operated worldwide aboard aircraft. The radars are used for ground mapping,

14、weather avoidance, and to calibrate aircraft on-board navigation systems for accurate aerial delivery in adverse weather conditions. 40 17 11 TABLE 1 Antenna type Antenna main beam gain (dBi) Antenna scan Radionavigation radar characteristics in the band 31.8-33.4 GHz Parabolic reflector 44 41.1 Ele

15、vation: -30“ to +lo“, manual azimuth: 360“ at 7, 12, or 21 rpm Elevation: -30“ to +lo“, manual azimuth: 360“ at 12 or 45 rpm Tuning type I 0.2 I I Pulse duration (p) I I Pulse repetition frequency (pps) I 2000 I 1600 I 6o I 39 I I Peak transmitter power (kW) Rec. ITU-R M.1466 3 3 Operational charact

16、eristics of radionavigation systems in the 31.8-33.4 GHz frequency band Aircraft radionavigation radars in the band 3 1.8-33.4 GHz operate continuously during flight. This encompasses an altitude range of from just off the ground to approximately 30 O00 feet (9 O00 m). Flight times can be up to six

17、hours, and typically the majority of the time is spent en route, but some linger time at either the departure or destination points is expected. Up to 18 aircraft operating these radionavigation radars can be active in a small geographic area (Le., separated by less than a kilometre from each other)

18、, though most often only 1-3 aircraft will be operating simultaneously together. 4 Protection criteria The desensitizing effect on radars from other services of a continuous-wave or noise-like type modulation is predictably related to its intensity. In any azimuth sectors in which such interference

19、arrives, its power spectral density can, to within a reasonable approximation, simply be added to the power spectral density of the radar receiver thermal noise. If power spectral density of radar-receiver noise in the absence of interference is denoted by NO and that of noise-like interference by Z

20、O, the resultant effective noise power spectral density becomes simply ZO + NO. An increase of about 1 dl3 would constitute significant degradation, equivalent to a detection-range reduction of about 6%. Such an increase corresponds to an (Z + MIN ratio of 1.26, or an ZIN ratio of about -6 dl3. This

21、 represents the aggregate effect of multiple interferers, when present; the tolerable ZIN ratio for an individual interferer depends on the number of interferers and their geometry, and needs to be assessed in the course of analysis of a given scenario. If continuous-wave interference were received

22、from most azimuth directions, a lower ZIN ratio would need to be maintained. The aggregation factor can be very substantial in the case of certain communication systems in which a great number of stations can be deployed. The effect of pulsed interference is more difficult to quantify and is strongl

23、y dependent on receiversIprocessor design and mode of operation. In particular, the differential processing gains for valid-target return, which is synchronously pulsed, and interference pulses, which are usually asynchronous, often have important effects on the impact of given levels of pulsed inte

24、rference. Several different forms of performance degradation can be inflicted by such desensitization. Assessing it will be an objective for analyses of interactions between specific radar types. In general, numerous features of radiodetermination radars can be expected to help suppress low-duty cycle pulsed interference, especially from a few isolated sources. Techniques for suppression of low-duty cycle pulsed interference are contained in Recommen- dation ITU-R M. 1372.

copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
备案/许可证编号:苏ICP备17064731号-1