- ページ 12

モデム ComBlock COM-1826のPDF マニュアルをオンラインで閲覧またはダウンロードできます。ComBlock COM-1826 19 ページ。 Tdrss spread-spectrum modem

ページを印刷する

ComScope Monitoring

Key internal signals can be captured in real-time

and displayed on a host computer using the

ComScope feature of the ComBlock Control

Center. Click on the

the signal traces and trigger are defined as follows:

Trace 1 signals

Format

1: Input signal I-

8-bit signed Input sampling

channel

2: Demodulated Q-

8-bit signed 1 sample /

channel

3: Parallel correlator

8-bit

output

unsigned

4: 2(S+N)/N after

8-bit

despreading. Valid

unsigned

only if code is locked.

Linear (i.e. not in dBs)

Trace 2 signals

Format

1: Input signal Q-

8-bit signed Input sampling

channel

2: Code replica.

8-bit signed 2 samples/chip 512

Compare with

spread input signals

3: Demodulated I-

8-bit signed 1 sample /

channel

4: Averaged signal

8-bit signed

power (valid only

during code tracking)

Trace 3 signals

Format

1: Code tracking phase

8-bit signed 2 samples /

correction

(accumulated)

2: Carrier fine tracking

8-bit signed

phase

3: I-Symbol tracking

8-bit signed 1 sample /

phase (accumulated)

4: Averaged noise

8-bit signed

power (valid only

during code tracking)

Trigger Signal

Format

1: Start of code

Binary

replica

2. Code Lock

Binary

Signals sampling rates can be changed under

software control by adjusting the decimation factor

and/or selecting the

clk

time sampling clock.

button to start, then select

Nominal

Buffer

sampling

length

rate

(samples)

512

rate

512

symbol

1 sample/code

512

epoch

512

clk

Nominal

Buffer

sampling

length

rate

(samples)

512

rate

512

symbol

512

clk

Nominal

Buffer

sampling

length

rate

(samples)

512

symbol

512

clk

512

symbol

512

clk

processing clock as real-

In particular, selecting the

real-time sampling clock allows one to have the

same time-scale for all signals.

The ComScope user manual is available at

www.comblock.com/download/comscope.pdf.

ComScope example, showing code lock with aligned:

received spread signal (green) vs code replica (red)

ComScope example: showing demodulated I-

processing clock as

clk

channel