Is there a simple way to create white noise data file?

I would like to create a home-made white noise generator to test the
sensitivity of a GPS receiver. It is a poor man's lobster, since I don't
want to buy a signal generator. Is there any simple way for me to create
numerical white noise and save it in a data file?

Thanks!

Johnson

To test the sensitivity of a GPS receiver, wouldn't you need white-noise
modulated RF at the GPS carrier frequency (about 1.5 GHz)?

I'd be interested in how you propose to get white noise from a data file
into that format, and why you wouldn't just use a "noise diode"
(well-known to the RF gurus)?

Isaac

And apart from that, mathematically speaking, white noise does not exist
in the sense of a stochastic process that you can create sample data
for. White noise is the time derivative of Brownian motion, which you
can create numerically, but Brownian sample paths are (almost surely)
nowhere differentiable. What passes for white noise in practical
applications would be a low pass filtered version of ideal white noise,
but with the cutoff frequency high enough that it doesn't matter for
the application. To simulate that, I guess you just create a
pseudorandom stream of independent samples of a Gaussian random
variable.

--
- It is undesirable to believe a proposition
when there is no ground whatsoever for supposing it is true.
-- Bertrand Russell

wrote:


The above makes no sense to me at all (and I'm a radio engineer) since
a file on your computer won't feed into your GPS very well, but what's
the problem with writing a simple random number generator using either
Java, VB, BASIC, C, C++, or even Excel? All of these allow you to
specify both an upper and lower value, and will distribut the numbers
appropriately within that range.

Matlab should have what you need to generate any "noise" and save it
to a file.
My question is: how do you plan to test the sensitivity of a GPS
receiver using a file with noise?