IEEE Geoscience and Remote Sensing Magazine - March 2018 - 41

plans, ranks and harmonizes the acService Request for
quisition requests in the subsequent
Acquisition and Processing
mission horizon, and sends the programing request list to the S-PCE. For
Service Request Feasibility
each programing request sent to the
Service Request Ranking
S-PCE, PX sends a service request
and Harmonization
containing the feasibility for that
Service Request Submission with
horizon to the FFP. The latter then
One Horizon Procurement Plan
imports each service request with
Already Harmonized
PX
FFP
its feasibility for the single horizon,
Planning Follow-Up
automatically sets the procurement
plan as submitted with the acquisition request already sent to the
Acquisition Follow-Up
S-PCE, and waits for the planning
Service Request
progress report. These requests on
Processing
the FFP site maintain their PX identiProduct Delivery
fier in terms of both UGS owner and
programing request identifier.
FIGURE 7. A sequence diagram showing the expandability up to harmonizing capability, in
The FFP receives the acquisition which PX is without processing capabilities.
plan (planning reports) from the CSG
planner for acquisition on behalf of
PX. The FFP acquisition manager notifies the S-IM that the
terference between the COSMO-SkyMed acquisition plan
raw data (L0) are available for the acquisition request created
and the other mission acquisition plan, including the time
on behalf of PX. Then, if PX has product generation capabilrequired to prepare the station for the new contact.
ity, the sequence is completed when the FFP sends the L0 file
to PX. Otherwise, if PX is interested in having a product and
TELEMETRY, TRACkING, AND CONTROL
has no processing capacities, the production from L0 is perEXPANDABILITY SOLUTIONS
formed directly by the FFP, which sends PX the final product.
In this scenario, the partner has an S-band antenna that
performs the following three main tasks: satellite tracking,
EXPANDABILITY OF ACQUISITION CAPABILITIES
ground-to-space link acquisition and maintenance, and teThe X-band antenna of an acquisition station is able to perlemetry-telecommand (TM-TC) and ranging/Doppler meaform the following operations:
surement execution. To accomplish these tasks, the station
is required to
◗ tracking the CSG satellites during their passes using their
orbital elements
◗ ensure tracking, transmission, receiving, and recording
of S-band TM-TC
◗ receiving the signals downlinked from the satellites
based on an acquisition plan
◗ provide the CSG GS with the received TM data in real
time and/or in off-line mode
◗ demodulating the data up to the baseband
◗ sending the data stream to the acquisition management
◗ uplink TC from the GS to the COSMO-SkyMed satellite
system
constellation in real time
◗ receiving the orbital elements by means of an external com◗ provide a ranging/Doppler measurements capability
munication system or by an operator manually keying.
◗ exchange operational data with the GS.
This scenario assumes that either the foreign partner or the
COSMO-SkyMed UGS has an acquisition station compatPROCESSOR ENCAPSULATOR EXPANDABILITY
ible with the air interface of the mission to be supported and
COSMO-SkyMed will also be expandable in terms of the proalso that the station is characterized by suitable flexibility at
cessor, meaning that it will be possible to insert new or difthe intermediate-frequency matrix level. Under such an asferent processors into the production chain. These additional
sumption, either baseband equipment or the baseband and
processors can be related to a new type of SAR product, to
a demodulator with a bit synchronizer can be integrated into
data acquired by another constellation, or to intermediate
the already existing station architecture to ensure demodulaproducts received from the external world.
tion, bit synchronization, frame synchronization, and image
The tasks in which the processors are involved take into
raw data archiving.
account all activities for the generation of the product assoWe must note that the reuse of an existing station, both
ciated with a given instantiated production schema. These
in terms of the antenna and the radio-frequency (RF) front
are required in the user's defined production request and
end, requires some analysis to be conducted relevant to
include, at minimum, the following:
1) the compatibility at the RF level between the station and
◗ input data retrieval (e.g., intermediate products and raw data)
the other mission to be acquired and 2) the potential in◗ support data retrieval
march 2018

ieee Geoscience and remote sensing magazine

41



Table of Contents for the Digital Edition of IEEE Geoscience and Remote Sensing Magazine - March 2018

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