SA Update to version v 6.2.6.7: two monitors

SA Update to version v 6.2.6.7

This is planned update.

Correct work of SA in the systems with two and more monitors is realized In this update.

Minor errors has been eliminated.

~Good Luck

PSK: VDL-2 (VHF) - AirSystem, PSK-8, Br - 10500

VDL-2 (VHF)

AirSystem, PSK-8, Br - 10500

Author: SergUA6 

Band Width ~17000 Hz

Baud Rate 10500 Hz

n-Ary (PSK/MPSK) PSK-8

RX mode source I/Q record

                                                                

          Here is example of VDL-2. Sent by foregin collegues.

Sonograms:

pic.1 General view

pic.2 Manipulation speed

Pictures

pic.3 Phase constellation

VDL-2 - It is rather new and the perspective view of aviation telecommunication (ATN). It is very actively introduced in practice. It is provided step-by-step change/move from the previous generation of similar system ACARS, to the new VDL-2, VDL-3. As well as in ACARS, data exchange between aircrafts and the earth occurs by extremely short packages. In average, lenght of the package is about 20-40 мс, but it can be both shorter and longer packages. In comparison with ACARS, the throughput of channel ATN in VDL-2 is essentialy increased from 2400 bps (ACARS) to ~31500 bps.


As a whole, at appropriate quality, the signal is confidently enough analyzed and identified, there are no obvious features detected.

SA update to version v 6.2.6.5

SA update to version v 6.2.6.5 

Planned update. 

In this update, possibility of resample and shift of the signals on fractional values of frequencies is added. 

Perhaps more important part of current updating, is the first stage of integration in SA calculator K. 

The first stage doesn't mean the high-grade calculator. At this stage, in SA the mainframe of preliminary processing, so-called preprocessing is integrated. The primary goals of this block, gathering of primary parameters of the signal, and preliminary rough processing of this data. 

 The list from the most probable values "Magic K" which detailed analysis will be spent in the second part of the calculator which integration is planned further will be result of work the pre-processing block. 

Nevertheless, even in such, very strongly simplified kind, it is already possible to receive authentic enough values K on some signals. 

That is much better, than absolutely nothing.As work with the calculator means some knowledge of main principles of its action, and some specific skills, the article concerning calculator use in practice has been written. Also some separate moments and problems of getting authentic values K ==> Analysis OFDM with CP in SA versions 6.2.6.5 - a pre-processor of calculator K. 

As usual, in this version some minor errors found out by users SA are eliminated, and small changes are added in some modules and blocks. 

Good luck~

FSK:PakNet - communication of data system (VHF)

PakNet - communication of data system (VHF)

Mode FM/GFSK, Br 8000

Author: SergUA6 

Band Width ~12 kHz

Baud Rate 8000 Hz

ACF 108 and 27 ms

RX mode Source I/Q record

The example of PakNet signal. sent by geka.

Sonograms:

pic.1 General view (two radiochanneles)

 pic.2 Manipulation speed

pic.3 Bit stream

 Diagrams:

pic.4 108 ms Period in VMW

pic.5  27 ms Period in VMW

 pic.6 the signal's ACF

PakNet - One of the oldest systems of documentary communication. It was founded in 1985-86 years. 

It is necessary to notice that within these years there was very intensive growth and development of various networks, such as Rosnet, Rospak, Sprint, Paknet etc. From that last abundance up to now days not many of them are still "alive" - PakNet one of the such. 

The cable network of Russia concerns documentary networks, to the same category belongs  PakNet, which is realized on qualitative another high level, than a cable network. 

In general PakNet, is not so much name of the protocol or a signal kind, but the name 

of the network.