Vaisala RVP900

Appendix E _____________________________________________________ Time Series Recording
VAISALA______________________________________________________________________ 425
- From a local disk archive
- From a remote network host (via tsimport)
- Tsswitch—GUI that allows the user to select the sole TS writer from
among these three possible sources. This GUI is described in Section
E.4 TS Switch Utility on page 423.
- Tsarchive—Process that handles both the recording and playback of
data. It has its own GUI to select record/playback mode and which
directory contains the local disk archive. It also shows an inventory of
the TS files and has filter/search capability to locate specific groups of
files (for example, by date and time). The tsarchive GUI record and
playback features are described in Section E.5 TS Archive Utility on
page 424.
- Tsimport and Tsexport—Processes that provide the ability to
receive/send time series over a network. Either a 1000 BaseT (gigabit)
or 100 BaseT Ethernet can be used depending on the typical mode of
operation and the competing network traffic. For example:
1000 bins * 2 parameters/bin/pulse * 16 bits/parameter * 1000
pulses/sec = 32 Mbit/sec
Here the two parameters/bin/pulse are the I and Q values, which are
represented by 16 bits each (floating point). For dual polarization
systems with two receiver channels, the data rate would be doubled.
The 32 Mbit/sec basic data rate here would fit comfortable on a
dedicated 100 BaseT network, with little or no competing traffic.
The output is through UDP broadcast. This is a very efficient way to
transfer data since there is virtually no overhead as compared to
standard TCPIP. The socket ports are configured so that the tsexport
on one system connects to the tsimporton another system. This
configuration is described in Section E.3 Installation & Configuration
on page 420.
- RVP900 Processes—Collection of processes that are only present on
an actual RVP900 machine. The two important functions are:
- IQ–Data: writes real time TS to the TS API. These are collected
from an IFDR.
- RVP9Proc-n: extracts TS from the TS API and processes the data
to obtain the various moments.
These processes can be viewed using the v command in dspx. A
remote archive host will most likely not be an RVP900. In this case,
these processes do not exist.