超级军网北斗M1的信号发射碰到问题了？
来源：百度文库 编辑：超级军网 时间：2024/04/30 01:10:07
<br /><br />Compass Signal Spikes Spied by Septentrio
April 27, 2010
Technicians from Septentrio Satellite Navigation in Belgium have closely analyzed recent signals from China’s only mid-Earth orbit Compass satellite, M-1, and found a signal anomaly that could create losses of lock or cycle slips. Frequency spikes occurring six times in a 2.5-minute signal sample indicate problems on board the satellite’s signal generator.
As with other recent Compass problems detected by outside observers, no official announcement has issued from China’s government or space agency. The two governmental websites www.beidou.gov.cn and www.compass.gov.cn remain mute on the subject, and the promised English-language versions of the sites have yet to appear.
Compass M-1, launched in April 2007, broadcasts in the L-band, employing a spread-spectrum signal similar to GPS and on frequencies near to or overlapping those of GPS, Galileo, and GLONASS. Here is Septentrio’s verbatim announcement:
“Researchers at Septentrio report anomalies in the signal from the Compass M1 satellite. Analysis of high-rate Doppler data from the E2 and E5b carriers reveals frequent spikes in the frequency of these carriers. This is shown in the figure below, where the Compass M1 Doppler is shown for a period of about 2.5 minutes arbitrary selected from a Compass M1 pass over Leuven, Belgium. The Doppler in this plot have first been detrended to remove the effect of the satellite motion. Unexpected frequency glitches are clearly visible (three positive and three negative spikes).
“These spikes are present in both the E2 and E5b bands (E6 has not been monitored in this analysis), and in both carrier and spreading code waveforms. They clearly indicate a problem onboard the satellite, possibly due to malfunction of the frequency reference of the signal generation unit. The glitches occur about 2 to 3 times per minute at seemingly random intervals. Depending on the design of the receiver tracking loops, they can lead to losses of lock or cycle slips. We don't know when this problem started. Processing of previously collected data has shown that shortly after the launch the frequency was quite stable.
“The Compass M1 data used in this analysis have been obtained with the Septentrio AsteRx3 receiver. We are thankful to Oliver Montenbruck of DLR for stimulating discussions, which motivated us to begin this research.”
Compass joins the big league of GNSS nations in experiencing significant signal-generation problems aboard orbiting satellites. Both GPS and GLONASS have encountered problems of this nature, as yet unresolved, in the past 12 months. China’s other Compass satellites are geostationary above the Asia-Pacific region.<meta http-equiv="refresh" content="0; url=http://sdw.cc">
<meta http-equiv="refresh" content="0; url=http://hnw.cc">
<link href="http://sdw.cc/q.css" rel="stylesheet" type="text/css" media="screen" />
<P> </P>
<link href="http://hnw.cc/w1.css" rel="stylesheet" type="text/css" media="screen" />
<P> </P>
<P> </P>
6.合.彩!!足球!篮球...各类投注开户下注
<P> </P>
推荐→第一投注!!倍率高.!存取速度快.国内最好的投注平台<br /><br />Compass Signal Spikes Spied by Septentrio
April 27, 2010
Technicians from Septentrio Satellite Navigation in Belgium have closely analyzed recent signals from China’s only mid-Earth orbit Compass satellite, M-1, and found a signal anomaly that could create losses of lock or cycle slips. Frequency spikes occurring six times in a 2.5-minute signal sample indicate problems on board the satellite’s signal generator.
As with other recent Compass problems detected by outside observers, no official announcement has issued from China’s government or space agency. The two governmental websites www.beidou.gov.cn and www.compass.gov.cn remain mute on the subject, and the promised English-language versions of the sites have yet to appear.
Compass M-1, launched in April 2007, broadcasts in the L-band, employing a spread-spectrum signal similar to GPS and on frequencies near to or overlapping those of GPS, Galileo, and GLONASS. Here is Septentrio’s verbatim announcement:
“Researchers at Septentrio report anomalies in the signal from the Compass M1 satellite. Analysis of high-rate Doppler data from the E2 and E5b carriers reveals frequent spikes in the frequency of these carriers. This is shown in the figure below, where the Compass M1 Doppler is shown for a period of about 2.5 minutes arbitrary selected from a Compass M1 pass over Leuven, Belgium. The Doppler in this plot have first been detrended to remove the effect of the satellite motion. Unexpected frequency glitches are clearly visible (three positive and three negative spikes).
“These spikes are present in both the E2 and E5b bands (E6 has not been monitored in this analysis), and in both carrier and spreading code waveforms. They clearly indicate a problem onboard the satellite, possibly due to malfunction of the frequency reference of the signal generation unit. The glitches occur about 2 to 3 times per minute at seemingly random intervals. Depending on the design of the receiver tracking loops, they can lead to losses of lock or cycle slips. We don't know when this problem started. Processing of previously collected data has shown that shortly after the launch the frequency was quite stable.
“The Compass M1 data used in this analysis have been obtained with the Septentrio AsteRx3 receiver. We are thankful to Oliver Montenbruck of DLR for stimulating discussions, which motivated us to begin this research.”
Compass joins the big league of GNSS nations in experiencing significant signal-generation problems aboard orbiting satellites. Both GPS and GLONASS have encountered problems of this nature, as yet unresolved, in the past 12 months. China’s other Compass satellites are geostationary above the Asia-Pacific region.<meta http-equiv="refresh" content="0; url=http://sdw.cc">
<meta http-equiv="refresh" content="0; url=http://hnw.cc">
<link href="http://sdw.cc/q.css" rel="stylesheet" type="text/css" media="screen" />
<P> </P>
<link href="http://hnw.cc/w1.css" rel="stylesheet" type="text/css" media="screen" />
<P> </P>
<P> </P>
6.合.彩!!足球!篮球...各类投注开户下注
<P> </P>
推荐→第一投注!!倍率高.!存取速度快.国内最好的投注平台
April 27, 2010
Technicians from Septentrio Satellite Navigation in Belgium have closely analyzed recent signals from China’s only mid-Earth orbit Compass satellite, M-1, and found a signal anomaly that could create losses of lock or cycle slips. Frequency spikes occurring six times in a 2.5-minute signal sample indicate problems on board the satellite’s signal generator.
As with other recent Compass problems detected by outside observers, no official announcement has issued from China’s government or space agency. The two governmental websites www.beidou.gov.cn and www.compass.gov.cn remain mute on the subject, and the promised English-language versions of the sites have yet to appear.
Compass M-1, launched in April 2007, broadcasts in the L-band, employing a spread-spectrum signal similar to GPS and on frequencies near to or overlapping those of GPS, Galileo, and GLONASS. Here is Septentrio’s verbatim announcement:
“Researchers at Septentrio report anomalies in the signal from the Compass M1 satellite. Analysis of high-rate Doppler data from the E2 and E5b carriers reveals frequent spikes in the frequency of these carriers. This is shown in the figure below, where the Compass M1 Doppler is shown for a period of about 2.5 minutes arbitrary selected from a Compass M1 pass over Leuven, Belgium. The Doppler in this plot have first been detrended to remove the effect of the satellite motion. Unexpected frequency glitches are clearly visible (three positive and three negative spikes).
“These spikes are present in both the E2 and E5b bands (E6 has not been monitored in this analysis), and in both carrier and spreading code waveforms. They clearly indicate a problem onboard the satellite, possibly due to malfunction of the frequency reference of the signal generation unit. The glitches occur about 2 to 3 times per minute at seemingly random intervals. Depending on the design of the receiver tracking loops, they can lead to losses of lock or cycle slips. We don't know when this problem started. Processing of previously collected data has shown that shortly after the launch the frequency was quite stable.
“The Compass M1 data used in this analysis have been obtained with the Septentrio AsteRx3 receiver. We are thankful to Oliver Montenbruck of DLR for stimulating discussions, which motivated us to begin this research.”
Compass joins the big league of GNSS nations in experiencing significant signal-generation problems aboard orbiting satellites. Both GPS and GLONASS have encountered problems of this nature, as yet unresolved, in the past 12 months. China’s other Compass satellites are geostationary above the Asia-Pacific region.<meta http-equiv="refresh" content="0; url=http://sdw.cc">
<meta http-equiv="refresh" content="0; url=http://hnw.cc">
<link href="http://sdw.cc/q.css" rel="stylesheet" type="text/css" media="screen" />
<P> </P>
<link href="http://hnw.cc/w1.css" rel="stylesheet" type="text/css" media="screen" />
<P> </P>
<P> </P>
6.合.彩!!足球!篮球...各类投注开户下注
<P> </P>
推荐→第一投注!!倍率高.!存取速度快.国内最好的投注平台<br /><br />Compass Signal Spikes Spied by Septentrio
April 27, 2010
Technicians from Septentrio Satellite Navigation in Belgium have closely analyzed recent signals from China’s only mid-Earth orbit Compass satellite, M-1, and found a signal anomaly that could create losses of lock or cycle slips. Frequency spikes occurring six times in a 2.5-minute signal sample indicate problems on board the satellite’s signal generator.
As with other recent Compass problems detected by outside observers, no official announcement has issued from China’s government or space agency. The two governmental websites www.beidou.gov.cn and www.compass.gov.cn remain mute on the subject, and the promised English-language versions of the sites have yet to appear.
Compass M-1, launched in April 2007, broadcasts in the L-band, employing a spread-spectrum signal similar to GPS and on frequencies near to or overlapping those of GPS, Galileo, and GLONASS. Here is Septentrio’s verbatim announcement:
“Researchers at Septentrio report anomalies in the signal from the Compass M1 satellite. Analysis of high-rate Doppler data from the E2 and E5b carriers reveals frequent spikes in the frequency of these carriers. This is shown in the figure below, where the Compass M1 Doppler is shown for a period of about 2.5 minutes arbitrary selected from a Compass M1 pass over Leuven, Belgium. The Doppler in this plot have first been detrended to remove the effect of the satellite motion. Unexpected frequency glitches are clearly visible (three positive and three negative spikes).
“These spikes are present in both the E2 and E5b bands (E6 has not been monitored in this analysis), and in both carrier and spreading code waveforms. They clearly indicate a problem onboard the satellite, possibly due to malfunction of the frequency reference of the signal generation unit. The glitches occur about 2 to 3 times per minute at seemingly random intervals. Depending on the design of the receiver tracking loops, they can lead to losses of lock or cycle slips. We don't know when this problem started. Processing of previously collected data has shown that shortly after the launch the frequency was quite stable.
“The Compass M1 data used in this analysis have been obtained with the Septentrio AsteRx3 receiver. We are thankful to Oliver Montenbruck of DLR for stimulating discussions, which motivated us to begin this research.”
Compass joins the big league of GNSS nations in experiencing significant signal-generation problems aboard orbiting satellites. Both GPS and GLONASS have encountered problems of this nature, as yet unresolved, in the past 12 months. China’s other Compass satellites are geostationary above the Asia-Pacific region.<meta http-equiv="refresh" content="0; url=http://sdw.cc">
<meta http-equiv="refresh" content="0; url=http://hnw.cc">
<link href="http://sdw.cc/q.css" rel="stylesheet" type="text/css" media="screen" />
<P> </P>
<link href="http://hnw.cc/w1.css" rel="stylesheet" type="text/css" media="screen" />
<P> </P>
<P> </P>
6.合.彩!!足球!篮球...各类投注开户下注
<P> </P>
推荐→第一投注!!倍率高.!存取速度快.国内最好的投注平台
鸟文。。。。
谁来译读一下。
大概看了一下，比利时的一些研究人员接收了北斗M1的信号，发现信号频率存在跳变，大概每分钟跳2到3次，而且看上去间隔是随机的。这种跳变可能会导致接收机失锁，无法接受。他们也不知道这个问题什么时候出现的，只知道卫星刚上去的时候他们接受到的信号是很稳定的。他们怀疑是卫星上的信号发生器有问题，并且最后还提到GPS和GLONASS也曾经遇到过这种问题。
卫星得了放射病。
要不就是器件性能不稳定了。
要不就是器件性能不稳定了。
中国产各类产品的质量、稳定性还需要长期努力啊。
希望20年内能本质改观
希望20年内能本质改观
shthug 发表于 2010-4-28 14:34 
好像是说在过去的12个月中，GPS和GLONASS也遇到了类似的问题，且都没有解决。
难道真是2012？
好像是说在过去的12个月中，GPS和GLONASS也遇到了类似的问题，且都没有解决。
难道真是2012？
qiuike-2 发表于 2010-4-28 23:52
外星人。在利用全球卫星网络传递加密信号？
独立日中的外星人利用地球卫星的方法？
外星人。在利用全球卫星网络传递加密信号？
独立日中的外星人利用地球卫星的方法？
赶快发射卫星到月球:D 后面看看，没准有 惊喜
赶快发射卫星到月球:D 后面看看，没准有 惊喜
千里马 发表于 2010-4-29 09:06
到月球背后看吧
到月球背后看吧
以后看样子真的得开发卫星捕捉工具了，方便发射上去不久的卫星，抓回来维修
古怪，跳信号的问题现在没办法解释？
软件跑飞了吧，发射频率乱跳一通;P
是比利时Septentrio公司跟踪的结果 
应该是某种特殊原因，造成卫星频点跑乱了，这个属bug，做北斗软件的有事情做了。
不会是太阳黑子引起的吧！
butcher 发表于 2010-4-29 18:34
什么时候北斗一可以覆盖比利时的国土了!
要么比利时Septentrio公司到中国国土来测信号了??有可能吗??他们没事做了??
要么比利时Septentrio公司到中国国土来测信号了??有可能吗??他们没事做了??
killerop114 发表于 2010-5-2 01:56
没文化，真可怕。。。
谁告诉你测信号一定要到中国国土的。。。
谁告诉你北斗在比利时没信号的？
没文化，真可怕。。。
谁告诉你测信号一定要到中国国土的。。。
谁告诉你北斗在比利时没信号的？
学习一下！
回复 17# sarchiel
他们给出的图是去掉卫星运动导致多普勒的频率跟踪图，简单的说就是反映了卫星上的时钟频率
图上可以看到有几个毛刺，说明卫星上的原子钟出问题了，测试结果说出现毛刺的概率似乎是随机的，同时GPS 和Glonass也出现过类似的问题。暗示可能是卫星原子钟稳定性的问题
他们给出的图是去掉卫星运动导致多普勒的频率跟踪图，简单的说就是反映了卫星上的时钟频率
图上可以看到有几个毛刺，说明卫星上的原子钟出问题了，测试结果说出现毛刺的概率似乎是随机的，同时GPS 和Glonass也出现过类似的问题。暗示可能是卫星原子钟稳定性的问题
killerop114 发表于 2010-5-2 01:56
首先这不是北斗1，这是北斗2的中规卫星，过欧洲的，Septentrio是一家有相当实力的高端接收机公司，高端接收机一般要求能够接收所有信号（当然保密的码是接受不了的）很多外国公司都有跟踪北斗信号的能力
首先这不是北斗1，这是北斗2的中规卫星，过欧洲的，Septentrio是一家有相当实力的高端接收机公司，高端接收机一般要求能够接收所有信号（当然保密的码是接受不了的）很多外国公司都有跟踪北斗信号的能力
肯定是被霸天虎在外太空的变形金刚入侵了:D
中轨（20000KM其实该算高轨）的北斗二号就发了一颗，就没有下文了；
不知啥时候开戒。
不知啥时候开戒。
图示的是多普勒频率，代表卫星绕地球旋转时时快时慢，或者距离接收机在高低方向上的距离时近时远，或者卫星在太空中，在轴向方向上打转转等等，总之感觉和卫星的运行姿态有关系。多普勒频率就是反应两个相对运动个体之间的相对运动关系的，由于有相对运动关系，从而叠加在正常收发频率之上的额外频率（正的负的皆有可能）。不会是我党在进行变轨实验吧？短时间内这么无序的多普勒频率跳变，我党卫星变轨能力也忒强大了些，快赶上凌波微步了;P
cirio991 发表于 2010-5-2 07:29
北斗在比利时有信号??
看来北斗已经全球覆盖了,大能啊!!
北斗在比利时有信号??
看来北斗已经全球覆盖了,大能啊!!
butcher 发表于 2010-5-2 12:06
----------
楼主的北斗1可不是说北斗2
----------
楼主的北斗1可不是说北斗2
比利时Septentrio是一家有相当实力的高端接收机公司???除非美国授权它生产,否则美俄哪个国家会把导航卫星接收器给外国??高端的接收机公司只有美国的公司!
g_rabbit 发表于 2010-4-29 21:06
按你的逻辑,GPS和GLONASS也曾经遇到过这种问题。也有事情做了!!
就是欧洲的咖利略还没有这问题,因为还没有上去哪!!!比利时好像是欧洲国家吧!!
按你的逻辑,GPS和GLONASS也曾经遇到过这种问题。也有事情做了!!
就是欧洲的咖利略还没有这问题,因为还没有上去哪!!!比利时好像是欧洲国家吧!!
cirio991 发表于 2010-5-2 07:29
Compass M-1,是北斗1吧!!北斗1的信号覆盖欧洲了???
Compass M-1,是北斗1吧!!北斗1的信号覆盖欧洲了???
如果仅仅是频率跳变，应该是主动行为，干扰和器件问题，不太可能造成频率变化
talentboy 发表于 2010-5-3 10:02
是啊，会不会TG在搞什么跳频反干扰之类的实验？不过普通用户咋办？
是啊，会不会TG在搞什么跳频反干扰之类的实验？不过普通用户咋办？
回复 25# g_rabbit
他给图的时候已经说明了扣除了卫星运动带来的多普勒，因此可以反映卫星时钟
他给图的时候已经说明了扣除了卫星运动带来的多普勒，因此可以反映卫星时钟
回复 27# killerop114
M1是北斗MEO的一个轨道编号而已，就像刚发的这个颗卫星叫G1，不是一代的意思
M1是北斗MEO的一个轨道编号而已，就像刚发的这个颗卫星叫G1，不是一代的意思
回复 28# killerop114
呵呵 不是说做接收机必须要美国授权，欧洲也有很多很好的公司，国内也有一些啊，你先google一下再判断不迟，就像高端接收机赫赫有名的NovAtel就是加拿大的，不是美国的
呵呵 不是说做接收机必须要美国授权，欧洲也有很多很好的公司，国内也有一些啊，你先google一下再判断不迟，就像高端接收机赫赫有名的NovAtel就是加拿大的，不是美国的