signal strength on a GPS

Started by Jim Whitby in sci.electronics.design5 years ago 39 replies
GPS

I'm asking this here in the hope someone knows something about GPS receivers. I'm a decent tech, but not an engineer... I have a Tomtom...

I'm asking this here in the hope someone knows something about GPS receivers. I'm a decent tech, but not an engineer... I have a Tomtom 2535 gps. Nice unit blah blah. Some ( software? ) engineer decided to change the gps info display. It now contains a pic of earth with dots for satellites instead of a bar graph. Ok. No biggie. Except now there is a signal strength percent! Perce...


NMEA GPS Signal Generator

Started by Anonymous in sci.electronics.design5 years ago 8 replies
GPS

I'm looking for a GPS Signal Generator to test GPS receivers in manufacturing. I found...

I'm looking for a GPS Signal Generator to test GPS receivers in manufacturing. I found this, http://dx.com/p/professional-gps-signal-generator-test-module-w-antennas-147378 But I think it's just a jammer. I'm trying to avoid getting an expensive vector signal generator to do this. Anyone know of something like this? Thanks


GPS spoofing

Started by Jan Panteltje in sci.electronics.design5 years ago 20 replies
GPS

GPS spoofing: ...

GPS spoofing: http://www.ae.utexas.edu/news/archive/2012/todd-humphreys-research-team-demonstrates-first-succ essful-gps-spoofing-of-uav Think there is some money in this... Now lemme try this little geepeesss module...


GPS module with clock output?

Started by Davej in sci.electronics.design5 years ago 28 replies

I'm wanting to accurately time-stamp some outdoor events. This is a stationary outdoor situation so I thought a GPS module might be a...

I'm wanting to accurately time-stamp some outdoor events. This is a stationary outdoor situation so I thought a GPS module might be a good approach for accurate time. If I could find a GPS module with a clock output rather than a 1PPS output maybe I wouldn't need to consider an additional disciplined oscillator module -- since I don't expect to lose the GPS signal lock. Any low-cost suggestio...


Frequency Standard - Rubidium or GPS?

Started by bart in sci.electronics.design8 years ago 40 replies
GPS

Hi all, I'm looking for some sort of frequency standard (10 MHz ref.?). Ebay has rubdium frequency standards for under $100.00 and there...

Hi all, I'm looking for some sort of frequency standard (10 MHz ref.?). Ebay has rubdium frequency standards for under $100.00 and there are also GPS disciplined OXCO frequency standards for ~$150.00 . My question : Is a 10-20 year old rubidium standard more accurate (even with aging drift) that a newer GPS disciplined OXCO? I can't afford a GPS corrected rubidium standard ( ~$70...


Expert GPS analysis requested

Started by Richard Henry in sci.electronics.design6 years ago 18 replies
GPS

No politics please - what is the technical impact of Lightsquared transmitters on military-use GPS systems?

No politics please - what is the technical impact of Lightsquared transmitters on military-use GPS systems?


Testing the Dealextreme ET411 GPS module

Started by Jan Panteltje in sci.electronics.design5 years ago 98 replies
GPS

Created a web page for the software: http://panteltje.com/panteltje/gps/ Please note this is just a quick hack, but it seems to work so...

Created a web page for the software: http://panteltje.com/panteltje/gps/ Please note this is just a quick hack, but it seems to work so far. Here is some output: Panteltje (c) gpspc-0.2 for EM-411 GPS receiver board ESC exits. latitude 1234.5678 N longitude 901.2345 E msl_altitude1 -18.5000 M geoid_separation 46.6000 M age_of_differential_correction 0.0000 station_id 0 ...


What is the cheapest way to get a GPS + solid state gyro?

Started by Peter in sci.electronics.design6 years ago 23 replies
GPS

I am looking at a project which requires a simple GPS receiver (not waas/egnos) and a low grade solid state gyro (not a "level") like the ones...

I am looking at a project which requires a simple GPS receiver (not waas/egnos) and a low grade solid state gyro (not a "level") like the ones you get in smartphones. The build volumes will be initially a batch of 100 and later perhaps thousands, but not more than that. What would be the currently recommended GPS module or chip, and a solid state gyro component? There is a lot of stuf...


Testing the Dealextreme ET411 GPS module

Started by Jan Panteltje in sci.electronics.design6 years ago
GPS

http://panteltje.com/panteltje/gps/ multiple waypoints and plane control framework added. :-)

http://panteltje.com/panteltje/gps/ multiple waypoints and plane control framework added. :-)


Best Portable GPS

Started by Jim Thompson in sci.electronics.design6 years ago 4 replies
GPS

I have GPS built into the Q45, but I'd like to buy something to travel with when I get rental cars. What's the best? ...

I have GPS built into the Q45, but I'd like to buy something to travel with when I get rental cars. What's the best? ...Jim Thompson [On the Road, in New York] -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and...


hobbyist frequency standard

Started by Anonymous in sci.electronics.design8 years ago 12 replies
GPS

Hi gang, There seem to be a lot of surplus GPS discliplined 10MHz OCXOs on eBay lately. Anyone here have experience using a setup like...

Hi gang, There seem to be a lot of surplus GPS discliplined 10MHz OCXOs on eBay lately. Anyone here have experience using a setup like that? I'm still looking into getting my lab equipped, I'm looking into the frequency thing. Besides GPS, there's the national standards. The Canadian equivalent to WWV is CHU, they broadcast time signals on a few frequencies. Has anyone tried disciplining ...


Added an active GPS antenna to the RTL 4000 tuner/spectrum analyzer

Started by Jan Panteltje in sci.electronics.design5 years ago 5 replies

Added an active GPS antenna to the RTL 4000 tuner/spectrum analyzer. Got a little active GPS antenna from ebay (item 150748428125) only 6 $, and...

Added an active GPS antenna to the RTL 4000 tuner/spectrum analyzer. Got a little active GPS antenna from ebay (item 150748428125) only 6 $, and made a little 'T' section to power it, while connected to the 4000 DVB-T tuner: http://panteltje.com/pub/GPS_antenna_T_power_section_IMG_3790.GIF That is just a LM317 to create a voltage of 4.75 V here: active...


Added an active GPS antenna to the RTL 4000 tuner/spectrum analyzer

Started by Jan Panteltje in sci.electronics.design5 years ago 1 reply

I once wrote: Added an active GPS antenna to the RTL 4000 tuner/spectrum analyzer. Got a little active GPS antenna from ebay (item...

I once wrote: Added an active GPS antenna to the RTL 4000 tuner/spectrum analyzer. Got a little active GPS antenna from ebay (item 150748428125) only 6 $, and made a little 'T' section to power it, while connected to the 4000 DVB-T tuner: http://panteltje.com/pub/GPS_antenna_T_power_section_IMG_3790.GIF And then today: First read this blog: http://michelebavaro.blogspot.nl/2012/04/...


Please help me spec a GPS replacement

Started by mpm in sci.electronics.design6 years ago 11 replies

OK - My Garmin GPS III Plus has just died. (handheld) Nothing obvious, fuse good, continuity, and the internals look clean and tight,...

OK - My Garmin GPS III Plus has just died. (handheld) Nothing obvious, fuse good, continuity, and the internals look clean and tight, etc... Did not drag out the scope - only a good visual inspection. I'm thinking I should just replace it. However, I really need the ability to enter coordinates and have the display show a pointer. Waypoints, routes and compass are also helpful. Steet m...


KX155A/KX165A with lower GPS interference in the RF output?

Started by Peter in sci.electronics.design9 years ago 17 replies
GPS

Hi All, I have a case of that well known interference on the 13th harmonic of 121.15 121.175 121.20 messing up GPS. The standard TED...

Hi All, I have a case of that well known interference on the 13th harmonic of 121.15 121.175 121.20 messing up GPS. The standard TED filters don't do much, probably because I cannot fit them precisely on the back of the radios but there is a ~ 2ft length of coax cable which is inaccessible (without seriously major dismantling). Is there any known version, or a modification, of these r...


Hi, i want to track my cat down route 66, cannot use GPS...

Started by Wilhelmina Stofzuiger in sci.electronics.design4 years ago 8 replies

Hi, I want to track my cat down route 66, cannot use GPS Only have a 5 Volt battery, and it is white wit ha black stripe. Anyone? Am under...

Hi, I want to track my cat down route 66, cannot use GPS Only have a 5 Volt battery, and it is white wit ha black stripe. Anyone? Am under NDA to tell you what cat.


A seawortthy GPS and radiati ncounter

Started by Jan Panteltje in sci.electronics.design4 years ago 1 reply
GPS

A sea worthy GPS and radiation counter http://panteltje.com/pub/a_seaworthy_GPS_radiation_counter_IMG_4447.JPG When sailing near F*ckupshima...

A sea worthy GPS and radiation counter http://panteltje.com/pub/a_seaworthy_GPS_radiation_counter_IMG_4447.JPG When sailing near F*ckupshima on the round-the-world trip with your small catemaran, you need this. I ordered some more solar flashlight boxes from ebay, those never arrived, got money back, ordered some other plastic boxes, but considering sinking ships and WOMEN on board, I wo...


GPS 1PPS

Started by John Larkin in sci.electronics.design2 years ago 66 replies
GPS

I'm writing a proposal for a system wherein the customer will give us a clock and a 1 PPS pulse, both LVDS, both derived from a...

I'm writing a proposal for a system wherein the customer will give us a clock and a 1 PPS pulse, both LVDS, both derived from a GPS receiver. They don't seem to know what will be the exact timing between the 1PPS pulse and the clock. Poking around a little, it seems like this is seldom specified. If the clock were, say, 100 MHz, would I expect a non-ambiguous edge timing of the 1 PPS re...


Robbery Suspect Tracked by GPS and Killed

Started by Anonymous in sci.electronics.design4 years ago
GPS

http://www.nytimes.com/2014/05/17/nyregion/robbery-suspect-tracked-by-gps-and-killed.html?hpw&rr ef=nyregion

http://www.nytimes.com/2014/05/17/nyregion/robbery-suspect-tracked-by-gps-and-killed.html?hpw&rr ef=nyregion


Interesting GPS module with onboard antenna

Started by Michael A. Terrell in sci.electronics.design6 years ago 13 replies
GPS

A couple are on Ebay for less than $35 http://www.ebay.com/itm/180815989220 -- You can't have a sense of humor, if you have...

A couple are on Ebay for less than $35 http://www.ebay.com/itm/180815989220 -- You can't have a sense of humor, if you have no sense.