GLONASS/GPS plug 'n play kits

If someone started to make plug 'n play kits for internal use in the CF-20,CF-19 and CF-30.. would you order one ?

The SN-4706 navigation receiver is designed as a surface mount device (SMD), taking into account the mass production requirements.

Specification:

* Number of receive channels: 24
* Mode: All - in - view
* GLONASS: L1-range (1592-1606 MHz), CT-code
* GPS/WAAS/EGNOS: L1-range (1575.42 MHz), C/A-code
* Accuracy of determining (RMS):
o horizontal coordinates:
+ in the autonomous mode 3 m
+ in the differential mode 2 m
o height: 5 m
o velocity: 0,1 m/sec
o time: 25 ns
* Time necessary for receiving navigation parameters,not more than:
o cold start: 50 sec
o hot start: 5 sec
o recapturing after loss of the signal for 20 sec: 3 sec
* Sensitivity: -163 dBW
* Moving parameter limits:
o ground speed: 0 to 500 m/sec
o acceleration: < 5g
o height: < 18 000 m
* Power consumption, not more than:
o holdover mode: 0,9 W
o tracking mode: 0,65 W
o "pulse" mode: 0,45 W
o waiting mode: 0,3 W
* Dimensions: 35х35х7 mm
* Weight: 10 g



Servicing characteristics:

* Operating temperature: -40 to +85°C
* Maximum operating humidity: 98% (at 40°С



Interface:

* Two RS-232Е input/output ports
* Protocols: IEC1162 (NMEA0183), BINR, RTCM SC 104 v2.2
* Baud rate: up to 230400 bit/sec
* Time mark: 1Hz, СMOS levels


The prices (EXW) for the
samples quantities are below:

CH4706

1-99 pcs: EUR109.-

NAVIOR24 ( a PCB with the CH4706 chip )

1-5 pcs: EUR229.-

the prices are from:

NVS Technologies AG
Letzaustrasse 2
CH-9462 Montlingen
Switzerland
Tel. +41717600736

 

Quote from the Russian Specifications:
"once a GLONASS receiver is tracking the satellite signals, a position fix is available instantly. It is stated that at peak efficiency the system's standard positioning and timing service provide horizontal positioning accuracy within 57–70 meters, vertical positioning within 70 meters, velocity vector measuring within 15 cm/s, and time transfer within 1 µs (all within 99.7% probability)."

57-70 meters is terrible accuracy! Even the cheap Tom-Tom, Nuvi, and similar low end GPS receivers will beat the crap out of that. Any good GPS should yield sub-10 meter accuracy, the better units like the em408 and the bu353 will usually give sub-meter, and the best (read very expensive) units give accuracy measured in centimeters.
CAP

 

The major design consideration of any aftermarket GPS solution has to be ruggedness that is matching or better than the system in which it is to be installed.

The EM-408 solutions seem to address this the best, though even that's a compromise. I suppose the best design from a ruggedness perspective would be the factory GPS kits, but they're knobbled by other constraints (as I've experienced with trouble getting one to work in my CF-28).

There's an ongoing thread about the offerings from Custom Toughbooks and the ruggedness issue has been well-discussed.

In all honesty, the best way to create a very rugged GPS is probably to not have it internal, but have it external and connecting through bluetooth, but that ignores other issues such as portability and proper integration with base hardware.

Craig.

 

The best way to have a GPS on the unit is to install it internally with proper tuning of antena, thats it, period and if you don't have the ability to mod it yourself. Grab a reliable usb gps, not a bluetooth gps and you are making youself miserable with extra charger and a chance of running out of battery charge if you are not aware of it.


ohlip

 

EXACTLY! What he said!

 

That is why I like my Globalsat USB, plug it in with any decent program and it works....

 

The prices aren't that great, it's not SiRF III, it doesn't support USB natively...

It looks like a dinosaur to me.

mnem
*SnapSnapSnap in a Z formation*

 

Ha! Look who's talking...

 

Who would know BETTER?

mnem
Scaly gets no respect.

 

Come now comrades, look how amazing our receivers are! They make very good hammers as well!

 

COOL!!
Will that thing play my 8-Track tapes as well?

 

Careful, you will not be PC if you do not take part in the pretense that all countries have equal ability in the construction of electronics!

 

quote wikipedia:

Currently GLONASS accuracy is slightly worse than GPS.

According Russian system of differentional correction and monitoring's data as of 29 May 2010 (2010 -05-29) precisions of GLONASS navigation definitions (for p=0.95) for latitude and longitude were 4.46—8.38 m with mean number of NSV equals 7—8 (depends on station). In the same time precisions of GPS navigation definitions were 2.00—8.76 m with mean number of NSV equals 6—11 (depends on station).

For using both navigation systems simultaneously precisions of GLONASS/GPS navigation definitions were 2.37—4.65 m with mean number of NSV equals 14—19 (depends on station).

Russian Federal Space Agency's director Anatoly Perminov claimed that some actions are in progress to increase GLONASS's accuracy.

By 2011 accuracy should achieve 2.8 m by means of expanding GLONASS's constellation, improving ground segment, increasing ephemerids accuracy etc.


GLONASS satellites transmit two types of signal: a standard precision (SP) signal and an obfuscated high precision (HP) signal.

The more accurate HP signal is available for authorized users, such as the Russian Military, yet unlike the US P(Y) code which is modulated by an encrypting W code, the GLONASS P codes are broadcast in the clear using only 'security through obscurity'. Use of this signal bears risk however as the modulation (and therefore the tracking strategy) of the data bits on the L2P code has recently changed from unmodulated to 250bps burst at random intervals. The GLONASS L1P code is modulated at 50bps without a manchester meander code, and while it carries the same orbital elements as the CA code, it allocates more bits to critical Luni-Solar acceleration parameters and clock correction terms.

Currently, an additional civil reference signal is broadcast in the L2 band with an identical SP code to the L1 band signal. This is available from all satellites in the current constellation, except satellite number 795 which is the last of the inferior original GLONASS design, and one partially inoperable GLONASS-M satellite which is broadcasting only in the L1 band.

end of quote.

GPS and Galileo capable receivers does exist ( the ublox H5 chip )


There will be four different navigation services available:

* The Open Service (OS) will be free for anyone to access. The OS signals will be broadcast in two bands, at 1164–1214 MHz and at 1563–1591 MHz. Receivers will achieve an accuracy of <4 m horizontally and <8 m vertically if they use both OS bands. Receivers that use only a single band will still achieve <15 m horizontally and <35 m vertically, comparable to what the civilian GPS C/A service provides today. It is expected that most future mass market receivers, such as automotive navigation systems, will process both the GPS C/A and the Galileo OS signals, for maximum coverage.

* The encrypted Commercial Service (CS) will be available for a fee and will offer an accuracy of better than 1 m. The CS can also be complemented by ground stations to bring the accuracy down to less than 10 cm. This signal will be broadcast in three frequency bands, the two used for the OS signals, as well as at 1260–1300 MHz.

* The encrypted Public Regulated Service (PRS) and Safety of Life Service (SoL) will both provide an accuracy comparable to the Open Service. Their main aim is robustness against jamming and the reliable detection of problems within 10 seconds. They will be targeted at security authorities (police, military, etc.) and safety-critical transport applications (air-traffic control, automated aircraft landing, etc.), respectively.

In addition, the Galileo satellites will be able to detect and report signals from Cospas-Sarsat search-and-rescue beacons in the 406.0–406.1 MHz band, which makes them a part of the Global Maritime Distress Safety System.

The Galileo system si scheduled to be operational in 2013..
GLONASS is up and running.

The possibility to combine GPS/Galileo/GLONASS capability in one reciever should be interesting.

 

Assuming that the government gets off its a$$ and does some maintenance on the existing GPS satellites, there is no need for any increase in accuracy.
I currently get sub-meter accuracy with a $35 USB BU353, when I have been a position to check it against known points or against top end surveyor's instruments it has often delivered fixes within 20 centimeters of actual position. The surveyor's instrument is good to within 2-3mm. This is today, not some time in the future. If you want to control your CNC milling machine with a GPS you might need more accuracy, my GPS is accurate to the point that I need glasses to see as well as it does.
CAP

 

Agreed... I think our GPS is fine for what we generally use it for. I have spoken to farmers who have called me to quiz me about their micro farming... Where their GPS needs to be good to the inch. That is when I refer them elsewhere.

My units are usually good to about 2-3 feet. Google maps shows me on my deck and will track me as I walk across to the other side of the deck. They will also show me moving around within my house. The more accurate units have a lot more space to devote to being more precise.. Not to mention the huge antennas atop their cabs.

 

I had one like that a few years back...



but mine was red.

And the button configuration was a little different

 

Mmmmmm... just watch out when you press the HIT ME button; a little guy in blue robes with a pointy hat pops out and whacks you upside the head with his staff...

mnem
YOU SHALL NOT PASS! You can stand, bid, or call.