Björn,
On 01/16/2015 12:01 AM, Björn Gabrielsson wrote:
Magnus,
I naturally meant with a reasonable price-tag, sorry for being sloppy on
that detail, and I do know that there is vendors for those signals.
If we had dual or triple frequency receivers below 500 USD things would
start to be
Hi
I have a question about the GPS antenna. Since the GPS signal strength on
the ground is about 20db lower than the thermal noise, does the gain of
antenna matter?
2015-01-16 7:01 GMT+08:00 Björn Gabrielsson b...@lysator.liu.se:
Magnus,
If civilian receivers where to implement L2C and L5
On 1/16/15 4:58 AM, Li Ang wrote:
Hi
I have a question about the GPS antenna. Since the GPS signal strength on
the ground is about 20db lower than the thermal noise, does the gain of
antenna matter?
Not a whole lot.. Obviously, you don't want something -10dBi, and there
is a direct effect
Hi,
Well, if you can avoid reception from ground you avoid both handling
reflexes as well as the thermal noise (300K vs. 3K).
You can't have higher antenna gain, since you want to receive fairly
omni-directional above the horizon, with maybe the first 5-10 degrees
nulled out.
What however
Brooke,
The traditional GPS has C/A and P(Y) on L1 and P(Y) on L2.
Most Civilian GPSes only uses C/A.
Advanced receivers can also use P(Y) code, since the P-code is known,
the hand-off to P code is known and the way that P-code is encrypted
into Y-code is known (XOR with another code,
Björn,
On 01/15/2015 07:55 PM, Björn Gabrielsson wrote:
Brooke,
The traditional GPS has C/A and P(Y) on L1 and P(Y) on L2.
Most Civilian GPSes only uses C/A.
Advanced receivers can also use P(Y) code, since the P-code is known,
the hand-off to P code is known and the way that P-code is
Magnus,
If civilian receivers where to implement L2C and L5 which now is
becoming common, they would gain quite a bit of precision in a similar
fashion. For car navigation, the GPS would know which lane you are in.
There ARE civilian receivers doing this, and has been for quite some
years.
If we had dual or tripple frequency receivers below 500 USD things would
start to be interesting. If high-volume kits would be just twice as
expensive, it would be possible to consider for more luxury models.
Hi Magnus,
I am currently (but slowly) evaluating about a dozen near identical,
Brooke,
The traditional GPS has C/A and P(Y) on L1 and P(Y) on L2.
Most Civilian GPSes only uses C/A.
Advanced receivers can also use P(Y) code, since the P-code is known,
the hand-off to P code is known and the way that P-code is encrypted
into Y-code is known (XOR with another code, called
Hi Martyn:
On each frequency there are a couple or more different codes.
The Civilian Acess (C/A) code on the L1 frequency is all public information and
so is the most commonly used.
But there are classified codes that have a much higher bit rate and allow for more accurate position, time and
Hello,
I have some questions on GPS and GNSS.
Do all the civilian GPS receivers only operate on the L1 frequency?
Are there any GPS frequency standards out there that use L1 and L2 and that can
be purchased by non-military customers?
I am playing with the new Lea-M8T receiver.
How do I know
I have some questions on GPS and GNSS.
Note GNSS is the generic word for any satellite based navigation system. GPS is
one of GNSS so you don't actually need to say GPS *and* GNSS.
Do all the civilian GPS receivers only operate on the L1 frequency?
No. All the cheap ones do, though.
Are
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