Title: Detection and the impact of man-made interference on EES (passive) operations
1Detection and the impact of man-made interference
on EES (passive) operations
- Thomas vonDeak
- NASA Spectrum Management Office
- 28-October-2004
Active Protection of Passive Radio Services
towards a concerted strategy" Hotel Panorama,
Cagliari, Sardinia, Italy, 28-29 October 2004
2ITU-R WP 7C Q.MITIGATION
- Draft New Question intended to aid EES passive in
addressing recurring issues impacting the study
of unwanted emissions and in-band interference
issues. - Approved by ITU-R WP 7C on 18 March 2004
- To be considered by SG 7 (tent. Nov. 2005)
- Review of the Decides
- - What prompted the particular Decides
- - The anticipated scope of the work (my view)
- - The status of current work
- - What needs to be done (again my view)
- Active Protection of Passive Radio Services
towards a concerted strategy"
3ITU-R WP 7C Q.MITIGATION
Characterization of technical parameters and
interference effects and possible interference
mitigation techniques for passive sensors
operating in the Earth exploration-satellite
service (passive) Questions to be studied
1 Passive sensor applications and
products 2 Typical passive sensors
characteristics 3 Characterization of degradation
from all possible interference sources 4 Identific
ation of interference degradation 5 Passive
sensors interference mitigation techniques
- Active Protection of Passive Radio Services
towards a concerted strategy"
4Decides 1 Passive sensor applications and
products
- Why
- To increase the understanding within the ITU-R
(and WRC) of the nature and impact of EES
operations to societal and economic institutions. - Builds on Recommendation ITU-R SA.515 Frequency
Bands and Bandwidths used for Satellite Passive
Sensing - Scope (Presumably an ITU-R Report)
- Description of the various passive sensor
operations. - Description of post-sensor processing and
products. - Explanation of the interdependency between
sensor operations in multiple bands. - Providing a quantitative measure of product
quality. - More quantitative than qualitative description of
the societal and economic value of the products. - Overview of the future directions of sensor
developments and their impact on products.
- Active Protection of Passive Radio Services
towards a concerted strategy"
5Decides 1 Passive sensor applications and
products
- Status
- No current inputs into ITU-R WP 7C on this
subject - US may input contribution for the November 2005
WP 7C meeting - Further Work
- Review of scope
- Active Protection of Passive Radio Services
towards a concerted strategy"
6Decides 2 Typical passive sensors characteristics
- Why
- Provide a uniform set of characteristics to be
used in sharing/compatibility studies. - Scope Presumably a Recommendation
- Technical description of the various types of EES
sensor characteristics - Table of parameters of the sensor types on a
band-by-band basis
- Active Protection of Passive Radio Services
towards a concerted strategy"
7Decides 2 Typical passive sensors characteristics
- Status
- Annex 9 of WP 7C Chairmans Report- Working
document toward a preliminary draft new
Recommendation - Typical technical and
operational characteristics of Earth
exploration-satellite service (passive) systems
operating below 275 GHz - Further Work
- Development of band-by-band characteristics.
- Active Protection of Passive Radio Services
towards a concerted strategy"
8Decides 3 Characterization of degradation from
all possible interference sources
- Why
- Provides the foundation for developing
interference apportionments for use in studies. - Scope Leads to Recommendation on apportionment
- Definition of interference degradation that
supports a methodology for evaluating the impact
of interference and mitigation techniques on
sensor operations and products. Possible
candidate Increase of measurement uncertainty. - Summary of all possible interference sources by
types of sources - Assessment of interference sources by type for
their impact on sensor operations (eg., spurious
emissions)
- Active Protection of Passive Radio Services
towards a concerted strategy"
9Decides 3 Characterization of degradation from
all possible interference sources
- Status
- Annex 21 of WP 7C Chairmans Report - Working
document toward apportionment of interference
criteria from Recommendation ITU-R SA.1029-2 - US might not submit inputs on this subject.
- Further Work
- Resolution of the issue regarding the nature of
the interference and its impact on apportionment
methodology constant vs time varying
interference.
- Active Protection of Passive Radio Services
towards a concerted strategy"
10Decides 4 Identification of interference
degradation
- Why
- Provides foundation for identifying and
evaluating mitigation techniques that may be
considered by designers of EES sensor systems
and/or applied to sensor data processing - Scope
- Defines interference parameters which can be
potentially used to differentiate between
man-made interference and natural emissions in
sensor operations and sensor data processing. - Provides methods for differentiation between
man-made interference and natural emissions on a
per pixel basis during sensor operations and
sensor data processing. - Provides methodology for assessing quantitatively
the potential for differentiation methods to
improve the quality of sensor data processing
products. - Provides methodology for assessing the impact of
grey pixels on sensor data processing products.
- Active Protection of Passive Radio Services
towards a concerted strategy"
11Decides 4 Identification of interference
degradation
- Status
- US is preparing a contribution on this subject
for the WP 7C November 2005 meeting.
- Active Protection of Passive Radio Services
towards a concerted strategy"
12Decides 5 Passive sensors interference
mitigation techniques
- Why
- Expansion of the cursory work started in
Recommendation ITU-R SM.1542 The protection of
passive services from unwanted emissions - Addresses the issue of equitable burden
sharing. - Provides recommendation on passive sensor
techniques that should be employed to mitigate
interference. - Scope
- Summary of passive sensor interference mitigation
techniques. - Provides methodology for quantitatively assessing
interference mitigation techniques improvement of
the quality of sensor data processing products. - Recommendation on a band-by-band basis of
interference mitigation techniques that should be
employed by designers of sensor operations and
sensor data processing.
- Active Protection of Passive Radio Services
towards a concerted strategy"
13Decides 5 Passive sensors mitigation techniques
- Status
- US planning input for WP 7C November 2005 meeting
- Active Protection of Passive Radio Services
towards a concerted strategy"
14And Also
Computer Simulation of Active Service transmitter
emissions
- Why
- Recommendation ITU-R SM.1541 regarded as too
conservative overstating the amount of unwanted
emission power. - Proposed raised cosine spectra representation
regarded as too optimistic or incorrect. - Computer simulated MSS feeder link transmitter
closely matched measured spectra. - Computer simulations can indicate the
effectiveness and relative burden (that is, cost)
of possible solutions. - Scope revision of Recommendation ITU-R SM.1633
Compatibility analysis between a passive service
and an active service allocated in adjacent and
nearby bands
- Active Protection of Passive Radio Services
towards a concerted strategy"
15Computer Simulation of Active Service transmitter
emissions
- Status
- WP 9D acceptable approach.
- WP 7C supports the use of this methodology.
- WP 4A recommends use on a case by case basis in
TG 1/9 studies. - WP 8B not appropriate to represent radar
transmitters. - Further Work
- US submission into ITU-R TG 1/9 of proposed OOB
factors for the fixed-service and fixed-satellite
service that have been simulated with available
parameters.
- Active Protection of Passive Radio Services
towards a concerted strategy"