5hz GPS receivers

**ShawJohn** · 04-09-2007, 01:01 PM

Has anyone tried the 5hz GPS receivers.

I can't provide any links but I was reading yesterday that the likes of slow moving agricultural gear like combined harvesters use 5Hz GPS receivers to accurately crop a field.

This technology is publicly available, just don't ask me where?!?

**2k1Toaster** · 04-09-2007, 01:19 PM

By a farm irragator and hacks it gps receiver!

Never tried them, but I know that in Streets and Trips it doesn't make any difference (2006 version, havent tried '07) because the program is only set to update on 1Hz signal. If you had a 1Ghz gps signal, you would still only update at 1Ghz with most programs.

I have seen another thread on here with 5Hz where someone pointed to a link to buy. Pretty cheap too, like $100 to $120... Sparkfun maybe? I'll dig around. After all, that is what badgers do!

************************ EDIT ************************

Badger smarts win!

5hz anyone?

It is sparkfun.com: http://www.sparkfun.com/commerce/pro...ducts_id=8266#

Of course it is an OEM module, but meh. Good antenna reception and cheap-ish. $99

**volum3rider** · 04-09-2007, 04:40 PM

Yeah there are a few out there like this one

http://www.garmin.com/products/gps185hz/

But almost all gps programs for pc consumers are set to update at 1hz.

**kevinlekiller** · 04-09-2007, 05:07 PM

Originally Posted by 2k1Toaster

you would still only update at 1Ghz with most programs.

1Ghz

**2k1Toaster** · 04-09-2007, 05:14 PM

Originally Posted by kevinlekiller

1Ghz

Wow. My badger senses didn't even pick that one up. Ghz is a habit nowadays!

I want the 1Ghz GPS module! Sign me up!!!

**henkbliek** · 04-09-2007, 06:44 PM

Lucky you; GPS is already at 1.57542GHz.
Hope the extra 575MHz doesn't bother you

**2k1Toaster** · 04-09-2007, 07:16 PM

refresh rate, not carrier frequency!

**Clintebb** · 03-31-2008, 12:43 AM

i am also interested in this, is there any software that works with 5hz?

as for the software only working with 1hz, you will still see an improvement, i would think a very noticable improvement. most of that improvement would be noticed in speed accuracy and when stationary. i would like to throw one of the gps receivers from work into the car and give that a go, 25hz with beaconor other external corections

but for the $2000 i dont think its worth it

and a car doesnt need 2cm accuracy..

does anyone know about mapmonkey or freedrive, or more in particular destinator, if it works with 5hz or just 1?

**DJiK** · 03-31-2008, 02:22 AM

For those interested, I had mentioned a few advantages of the 5Hz GPS receivers in this thread.

**mx270a** · 04-06-2008, 04:30 PM

I'm playing with a Trimble 252 receiver, which sends location info at 10Hz. Yes, this is for farm use. The receiver lists for $5000, plus another $1500/year for Omnistar HP service. Accuracy is normally within 2-4 inches.

Cheap GPS receivers only listen to the L1 frequency. There is a L2 frequency that is encrypted, which is what the military uses. These more precise receivers can use the carrier signal of L2, but not the data inside it. The Omnistar correction is a differential correction service like WAAS, but newer and better.

For mapping, I can see the difference between a 1Hz WAAS receiver and a 10Hz Omnistar receiver. I don't think it would be that much help in a car.

A standard WAAS antenna will tell you which road you're on. A higher precision antenna should be able to determine which lane you're in. For example, if you need to take a certain exit off an Interstate, it could nag you if you're in the wrong lane.

The speed output isn't going to be much more accurate, and might be harder to read since it is being updated about as fast as you can see it. We're talking .1 and .01 MPH changes.

I have a Garmin 16 (1Hz WAAS) that is relatively calm when it isn't moving. Whatever heading it was reporting when it was moving is what it keeps reporting. On the other hand that Trimble 252, when sitting still, will report even the slightest bit of movement as a new heading and a speed. If you are looking at something in a perspective view, and the heading keeps changing, the display is going to keep re-rendering the view based on that new heading.