GIOVE-B Transmitting its First Signals

[David Farber <dave () farber net>]

Begin forwarded message:

> From: Bob Frankston <bob37-2 () bobf frankston com>
> Date: May 13, 2008 11:11:53 AM EDT
> To: David Farber <dave () farber net>, 'ip' <ip () v2 listbox com>
> Cc: 'Paul Saffo' <paul () saffo com>
> Subject: RE: [IP] GIOVE-B Transmitting its First Signals

> It’s great to have more GPS capabilities but it also be very helpful 
>  to think about GPS beyond just satellites and to have protocols for 
>  providing the information from other sources such as within buildin 
> gs. While there are ad-hoc and business-driven efforts to note the l 
> ocations of alternative markers such as MAC addresses we need a stan 
> dard approach that wouldn’t be so dependent upon outside line-of-sig 
> ht.
>
>
>
> Also current implementations presuming a single receiver and single  
> consumer. Thus if I have a Bluetooth GPS device it isn’t available a 
> s a resource. One useful exception is Windows Mobile GPS protocol th 
> at does support such sharing but it’s just an API. Even something as 
>  simple as moving from faux-wire Bluetooth to an 802.11 based approa 
> ch would be helpful.
>
>
>
> Instead of just focusing on the relationship between a particular  
> chipset and a particular set of satellites we need a protocol for  
> making this information readily available to software applications.  
> We have a start in the RS-232-based protocols but need to move  
> beyond the 1970’s vintage (even if the actual design is a bit newer) 
>  approach.
>
>
>
> From: David Farber [mailto:dave () farber net]
> Sent: Tuesday, May 13, 2008 10:26
> To: ip
> Subject: [IP] GIOVE-B Transmitting its First Signals
>
>
>
>
>
>
> Begin forwarded message:
>
> From: Paul Saffo <paul () saffo com>
> Date: May 13, 2008 10:13:48 AM EDT
> To: David Farber <dave () farber net>
> Subject: GIOVE-B Transmitting its First Signals
>
> A big step towards GPS III, which will enable dramatic new navigation
> and life safety functions.
> -p
>
> GIOVE-B Transmitting its First Signals  08/05/2008
>
> Following a successful launch on 27 April, GIOVE-B has begun
> transmitting navigation signal on 7 May. This is a historic step for
> satellite navigation since GIOVE-B is now, for the first time,
> transmitting the GPS-Galileo common signal using a specific optimised
> waveform, MBOC (multiplexed binary offset carrier), in accordance with
> the agreement drawn up in July 2007 by the EU and the US for their
> respective systems, Galileo and the future GPS III.
>
> These GIOVE B signals, locked on-board to a highly stable Passive
> Hydrogen Maser clock, will provide higher accuracy in challenging
> environments where multipath and interference are present, and deeper
> penetration for indoor navigation. It demonstrates that Galileo and
> GPS are truly compatible and interoperable and that positioning
> services will benefit all users worldwide. The quality of the signals
> transmitted by GIOVE-B will have an important influence on the
> accuracy of the positioning information that will be provided by the
> user receivers on the ground. Onboard GIOVE-B carries a passive
> hydrogen maser atomic clock, which is expected to deliver
> unprecedented stability performance.
>
> The signal quality can be affected by the environment of the satellite
> in its orbit and by the propagation path of the signals travelling
> from space to ground. Additionally, the satellite signals must not
> create interference with services operating in adjacent frequency
> bands, and this is also being checked. Galileo teams within ESA and
> industry have the means to observe and record the spectrum of the
> signals transmitted by GIOVE-B in real time. Several measurements are
> performed relating to transmitted signal power, centre frequency and
> bandwidth, as well as the format of the navigation signals generated
> on board. This allows the analysis of the satellite transmissions in
> the three frequency bands reserved for it.
>
> Caption: A screen in the control room displays the spectra of signals
> received from GIOVE-B shortly after the spacecraft began transmitting
> navigation signals.
> Website: http://www.esa.int/esaCP/SEMGVUZXUFF_index_0.html
>
> http://www.gim-international.com./news/id3042- 
> GIOVEB_Transmitting_its_First_Signals.html
>
> Archives

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