simultaneous reception and demodulation of:
(a) Both SGLS Carriers 1 and 2 while phaselock tracking Carrier 1, or
(b) SGLS Carrier 3 while tracking in the cross-correlation mode, and
(c) Non-SGLS carriers which may be AM, FM, or PM
modulated with a spectral occupancy of up to 28 MHz.
(Note: The SGLS downlink /baseband structure is
summarized in table 2-2.)
- 225 to 260 MHz.
Provision shall be made for simultaneous reception and
demodulation of five carriers in the 225 to 260 MHz baseband, each of which
may be AM, FM, or PM modulated with a spectral occupancy of up to 1 MHz. The
FM modulation may include a baseband of IRIG subcarriers.
- Telemetry Data Processing and Recording.
Telemetry data to be processed and recorded may
include PCM data and IRIG baseband data. Equipment in the receiving,
demodulating, processing and recording chain shall not degrade PCM data by more
than 1 DB from theoretical curves of bit error rate vs input signal-to-noise
ratio. Station equipment shall not degrade analog data by more than 3
- PCM Data.
The SGLS data shall be recorded on tape and
decommutated as required to permit real-time processing. The recorded data
may be used for on-site playback and postpass processing, or may be shipped to
the STC or other designated agency. The decommutated data shall be processed
as necessary and transmitted to the STC realtime. The SGLS PCM data may be
secure or nonsecure and shall be decrypted as required.
- IRIG Baseband Data.
IRIG baseband data shall be recorded on tape, discriminated, and
decommutated. The recorded data may be used for on-site playback,
discrimination, decommutation and processing, or shipped to the STC or other
designated agency. The discriminated and decommutated data shall be made
available for processing.
- Data Processing.
The demodulated telemetry data shall be:
(a) Correlated with system time, which may be either Greenwich Mean
Time (GMT) or playback of previously recorded time;
(b) Identified and separated as required for immediate control; and
(c) Edited, reformatted,
and smoothed by selected algorithms as required for storage, local station
display, and transmission to the STC in combination with tracking and command
status data over a single 2400 b/s data link.
Data may also be processed postpass, using playback of analog tape recordings
or digital history recordings.
2.3 DATA PROCESSING
The combined hardware/software configuration of the KTS data processing
elements shall be capable of providing the following:
The functional requirements for each of these data
processing areas are cited in the following paragraphs.
- Programmed computations support in the areas of acquisition, tracking,
telemetry, and command.
- RTS status and control.
- Interstation communications data processing.
2.3.1 Computational Support
The following types of data processing shall be provided:
Acquisition Data Processing. Predicted satellite position (ephemeris) data
shall be stored, processed, and made available to the antennas in the form of
appropriate analog and digital signals that can be used to position the main
antenna beam at the corresponding acquisition angles.