Recommendation ITU-R M.1802-1
(04/2010)
Characteristics and protection criteria for
radars operating in the radiolocation service
in the frequency band 30-300 MHz
M Series
Mobile, radiodetermination, amateur
and related satellite services
ii
Rec. ITU-R M.1802-1
Foreword
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Title
Satellite delivery
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Broadcasting service (sound)
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Mobile, radiodetermination, amateur and related satellite services
Radiowave propagation
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Vocabulary and related subjects
Note: This ITU-R Recommendation was approved in English under the procedure detailed in Resolution ITU-R 1.
Electronic Publication
Geneva, 2010
 ITU 2010
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Rec. ITU-R M.1802-1
1
RECOMMENDATION ITU-R M.1802-1
Characteristics and protection criteria for radars operating in the
radiolocation service in the frequency band 30-300 MHz
(Question ITU-R 237/5)
(2007-2010)
Scope
This Recommendation describes VHF radiodetermination radars and provides technical parameters and
protection criteria for some type of radars operating in the band 30-300 MHz.
The ITU Radiocommunication Assembly,
considering
a)
that technical characteristics of radars operating in the radiodetermination service depend
on specific applications, and could significantly vary, even within the same frequency band;
b)
that within different ITU Regions as well as in different countries certain frequency bands
in the range 30-300 MHz are allocated to the radiodetermination service;
c)
that the VHF range provides unique capabilities for detecting objects at a very large
distance, that is the most suitable for tracking and identification of space objects;
d)
that analysis of frequency sharing between radiodetermination radars and systems in other
services and determination of the feasibility of implementing new types of radiodetermination
radars and to select appropriate frequency bands require knowledge of technical and operational
characteristics of the systems operating in a specific frequency band,
recommends
1
that technical and operational characteristics and protection criteria of the radiolocation
radars described in Annex 1 should be considered representative of those systems operating in the
frequency range 30-300 MHz and used in studies of compatibility with systems in other services;
2
that Recommendation ITU-R M.1461 should be used as a guideline in analysing
compatibility between radars operating in the radiodetermination service with systems in other
services.
Annex 1
Technical and operational characteristics and protection criteria
of radar systems operating in the frequency range 30-300 MHz
1
Introduction
Representative characteristics of radiolocation radars operating in the frequency range 30-300 MHz
are shown in Table 1. This information is required for assessment of compatibility between radars
and systems in other services.
2
2
Rec. ITU-R M.1802-1
Technical characteristics
The frequency range 30-300 MHz is used by several different types of radars on fixed platforms
within different ITU Regions as well as in different countries. Radiolocation functions performed in
the band are space object recognition and tracing.
TABLE 1
Characteristics of radars operating in the frequency range 30-300 MHz
Parameter
Value
Radar А
Radar type
Radar purpose
Radar В
Primary ranging radar
Radar C
Primary ranging
radar (bi-static)
Space object recognition and tracing
Frequency band (MHz)
154-156
142-144
Relative frequency instability
10–11
10–11
N/A
Output pulse power (min/max) (dBW)
27/46
40/46
47.2
Mean output power (min/max) (dBW)
22/41
35/41
47.2
Polarization
Pulse duration (s)
Linear
13 000
3 200
N/A
Duty cycle
0.322
N/A
Modulation type
Pulse
Continuous Wave
19
5
Altitude above the ground level (m)
Antenna type
Phased array
Maximum antenna gain (dB)
– transmitter
– receiver
25
30
24
N/A
Maximum antenna gain on the horizon (dB)
9
12
Main beam pattern (degrees)
– horizontal plane (Rx/Tx)
– vertical plane (Rx/Tx)
2.6/5.2
2.6/2.6
8
20
Scan angle ranges (degrees):
– horizontal plane
– vertical plane
0-360
2-70
4 sectors
covering:
0-180
30
800
N/A
Receiver noise temperature (K)
Operational receiver passband (kHz)
0.132
625
50
Necessary bandwidth (kHz)
0.132
625
<1
Emission class
P0N
MXN
N0N
I/N protection ratio (dB)
NOTE 1 – N/A – not applicable.
−6