GA/T 1255-2016 PDF in English
GA/T 1255-2016 (GA/T1255-2016, GAT 1255-2016, GAT1255-2016)
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Police digital trunking communication system Technical requirements and measurement methods for radio frequency equipment
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Standards related to (historical): GA/T 1255-2016
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GA/T 1255-2016: PDF in English (GAT 1255-2016) GA/T 1255-2016
GA
PUBLIC SECURITY INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 33.060.01
A 90
Police Digital Trunking Communication System - Technical
Requirements and Measurement Methods for Radio
Frequency Equipment
ISSUED ON: SEPTEMBER 8, 2016
IMPLEMENTED ON: SEPTEMBER 8, 2016
Issued by: The Ministry of Public Security of the People’s Republic of China
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms, Definitions, Symbols and Abbreviations ... 7
3.1 Terms and Definitions ... 7
3.2 Symbols and Abbreviations ... 10
4 Classification ... 10
5 Requirements ... 11
5.1 RF Performance Requirements ... 11
5.2 Electromagnetic Compatibility Requirements ... 13
5.3 Electrical Safety Requirements ... 14
5.4 Environmental Adaptability Requirements ... 14
6 RF Performance Parameter Test Conditions and Test Methods ... 17
6.1 RF Performance Parameter Test Conditions ... 17
6.2 Transmitter RF Performance Parameter Test Methods... 19
6.3 Receiver RF Performance Parameter Test Methods ... 26
7 Electromagnetic Compatibility Test Methods ... 34
7.1 Conducted Disturbance ... 34
7.2 Radiated Disturbance ... 34
7.3 Electrostatic Discharge Immunity ... 34
7.4 RF Electromagnetic Field Radiation Immunity ... 34
7.5 Electrical Fast Transient Pulse Group (Power Port) Immunity ... 35
7.6 Surge (Power Port) (Impact) Immunity ... 35
7.7 Conducted Disturbance Immunity of RF Induction (Power Port) ... 35
7.8 Immunity to Voltage Sags, Short Interruptions and Voltage Variations (Power Port) ... 35
8 Electrical Safety Test Methods ... 35
9 Environmental Adaptability Test Methods ... 35
9.1 Test Methods for Mechanical Environmental Adaptability ... 35
9.2 Test Methods for Climate and Environmental Adaptability ... 37
9.3 Test Methods for Enclosure Protection Level ... 40
9.4 Test Methods for Adaptability to Hazardous Environments ... 40
Appendix A (normative) Test Sites and Site Layout Guide for Radiation Test ... 41
Appendix B (normative) General Test Methods for Radiated Spurious Emissions... 44
Police Digital Trunking Communication System - Technical
Requirements and Measurement Methods for Radio
Frequency Equipment
1 Scope
This Standard stipulates the terms, definitions, symbols and abbreviations, classification,
requirements and measurement methods for radio frequency equipment of the police digital
trunking communication system.
This Standard is applicable to the transceiver stations, mobile stations and portable stations of
the police digital trunking communication system, as well as their related systems and other
equipment.
2 Normative References
The following documents are indispensable to the application of this document. In terms of
references with a specified date, only versions with a specified date are applicable to this
document. In terms of references without a specified date, the latest version (including all the
modifications) is applicable to this document.
GB/T 2423.1-2008 Environmental Testing for Electric and Electronic Products - Part 2: Test
Methods - Tests A: Cold
GB/T 2423.2-2008 Environmental Testing for Electric and Electronic Products - Part 2: Test
Methods - Tests B: Dry Heat
GB/T 2423.3-2006 Environmental Testing for Electric and Electronic Products - Part 2:
Testing Method - Test Cab: Damp Heat, Steady State
GB/T 2423.5-1995 Environmental Testing for Electric and Electronic Products - Part 2: Test
Methods - Test Ea and Guidance: Shock
GB/T 2423.8-1995 Environmental Testing for Electric and Electronic Products - Part 2: Test
Methods - Test Ed: Free Fall
GB/T 2423.10-2008 Environmental Testing for Electric and Electronic Products - Part 2: Tests
Methods - Test Fc: Vibration (Sinusoidal)
GB/T 2423.17-2008 Environmental Testing for Electric and Electronic Products - Part 2: Test
Methods - Test Ka: Salt Mist
The electrical fast transient pulse group (power port) immunity of the transceiver station shall
comply with the requirements of test level 3 in GB/T 17626.4-2008. During the test, the
transceiver station allows temporary loss or reduction of functions or performance. After the
test is stopped, the transceiver station shall be able to resume normal operating state by itself
without human intervention.
5.2.6 Surge (power port) (impact) immunity
The surge (impact) immunity of the transceiver station using AC power supply shall comply
with the requirements of test level 3 in GB/T 17626.5-2008. The surge (impact) immunity of
the transceiver station using DC power supply shall comply with the requirements of test level
2 in GB/T 17626.5-2008. During the test, the transceiver station allows temporary loss or
reduction of functions or performance. After the test is stopped, the transceiver station shall be
able to resume normal operating state by itself without human intervention.
The surge (impact) immunity of the mobile station shall comply with the requirements of test
level 2 in GB/T 17626.5-2008. During the test, the mobile station allows temporary loss or
reduction of functions or performance. After the test is stopped, the mobile station shall be
able to resume normal operating state by itself without human intervention.
5.2.7 Immunity to conducted disturbances induced by RF field (power port)
The immunity to conducted disturbances induced by RF field of the transceiver station and
mobile station shall comply with the requirements of test level 3 in GB/T 17626.6-2008.
During the test, the transceiver station and mobile station allow temporary loss or reduction of
functions or performance. After the test is stopped, the transceiver station and mobile station
shall be able to resume normal operating state by themselves without human intervention.
5.2.8 Immunity to voltage sags, short interruptions and voltage variations
The transceiver station powered by AC power grid is subjected to 40% voltage sag for 10
cycles, 70% voltage sag for 25 cycles and short interruption for 250 cycles. During the test,
the transceiver station allows temporary loss or reduction of functions or performance. After
the test is stopped, the transceiver station shall be able to resume normal operating state by
itself without human intervention.
5.3 Electrical Safety Requirements
It shall comply with the requirements of Chapter 12 of GA/T 1056-2013.
5.4 Environmental Adaptability Requirements
5.4.1 Test criteria and configuration requirements
In the environmental adaptability test, basic electrical performance (carrier output power,
carrier frequency error and static sensitivity) is used as the performance criterion after the test.
In the environmental adaptability test of the portable station, the basic electrical performance
test uses the portable station’s standard battery.
5.4.2 Mechanical environmental adaptability
5.4.2.1 Impact
After the mobile station, portable station and transceiver station are tested according to the
method specified in 9.1.1, the appearance of the mobile station, portable station and
transceiver station and their internal structural units shall not produce permanent structural
deformation, mechanical damage, electrical failure and loose fastening parts. The internal
circuits, circuit boards, interfaces and other plug-ins of the mobile station, portable station and
transceiver station shall not fall off, become loose or have poor contact. After the test, the
mobile station and portable station shall be able to communicate normally, the transceiver
station shall be able to transmit and receive normally, and the basic electrical performance
shall not change.
5.4.2.2 Free fall
After the portable station is tested according to the method specified in 9.1.2, the appearance
of the portable station and its internal structural units shall not produce permanent structural
deformation or mechanical damage. During the test, the portable station battery is allowed to
fall off or become loose. After the test, the portable station can operate normally, and the basic
electrical performance will not change.
5.4.2.3 Vibration
After the transceiver station, mobile station and portable station are tested according to the
method specified in 9.1.3, the appearance of the transceiver station and mobile station and the
portable station and its internal structural units shall not produce permanent structural
deformation, mechanical damage, electrical failure and loose fastening parts. The internal
circuits, circuit boards, interfaces and other plug-ins of the transceiver station, mobile station
and portable station shall not fall off, become loose or have poor contact. After the test, the
mobile station and portable station shall be able to communicate normally, and the basic
electrical performance shall not change. The transceiver station shall be able to transmit and
receive normally, and the basic electrical performance shall not change.
5.4.3 Climate and environmental adaptability
The transceiver station, mobile station and portable station shall be tested for climate and
environmental adaptability as specified in Table 3. During the test, there shall be no state
change, the transceiver station shall be able to transmit and receive normally, and the mobile
station and portable station shall be able to communicate normally in digital direct mode.
After the test, the transceiver station, mobile station and portable station shall be able to start
up normally, the transceiver station shall be able to transmit and receive normally, and the
mobile station and portable station shall be able to communicate normally in digital trunking
mode and digital direct mode. After the salt spray test, there shall be no rust on the surface of
the transceiver station, mobile station and portable station, the transceiver station shall be able
6 RF Performance Parameter Test Conditions and Test
Methods
6.1 RF Performance Parameter Test Conditions
6.1.1 Test conditions
6.1.1.1 General test conditions
The general test conditions of the equipment are as follows:
---Normal temperature: +15°C ~ +35°C;
---Relative humidity: 20% ~ 75%;
---Normal voltage: For equipment powered by lead-acid batteries, the normal voltage is
1.1 times the nominal operating voltage; for equipment of other power supply types, the
normal voltage is the nominal voltage;
---Normal atmospheric pressure: 86kPa ~ 106kPa.
6.1.1.2 Extreme conditions
The transceiver station, mobile station and portable station shall, based on the types of
equipment they are suitable for in different climatic environments, take the high temperature
(operating state) and low temperature (operating state) in their respective operating states as
the extreme conditions of the test according to the provisions in Table 1.
6.1.2 Test operating conditions
6.1.2.1 Test sample conditions
6.1.2.1.1 The samples to be tested can be products submitted by the manufacturer for
inspection or products sampled by the testing department according to regulations. For all
samples submitted for inspection or random inspection, the manufacturer shall provide the
technical documents and auxiliary testing devices required for testing before testing can be
carried out.
6.1.2.1.2 Auxiliary testing devices include: RF adapters or RF cables that can be connected to
standard testing instruments; power supply cables that need to be connected to external power
supplies, etc.
6.1.2.1.3 In principle, it is not allowed to open the casing for testing during the entire test
process. If it is necessary to open the casing for testing, it shall be stated in the test report.
6.1.2.1.4 When testing the spurious emission of the transmitter chassis port and the receiver
P (P') -- Output power of the transmitter under test read on the test equipment, in
decibel-milliwatts (dBm);
L1 -- Insertion loss of the “connection/conversion device” in the specified frequency
band (frequency), in decibels (dB);
L2 -- Attenuation of the fixed attenuator, in decibels (dB).
Determine whether the result complies with the requirements of the transmitter
power (conducted) and power tolerance change specified in Table 1;
d) According to the provisions of 6.1.2.2, change the operating frequency of the
transmitter under test and repeat the test process from b) to c);
e) Repeat the process from a) to d) under extreme conditions.
6.2.3 Test method for 4FSK modulation frequency deviation error
Connect the test system as shown in Figure 1. The test equipment may be a comprehensive
tester or a spectrum analyzer with vector analysis function. The test procedure is as follows:
a) The transmitter operates at the maximum transmitter power (conducted) state at a
specified test frequency; select a certain number of slots (greater than or equal to
100), use the test equipment to measure the 4FSK modulation within the valid time
domain envelope time, and read or calculate the 4FSK modulation frequency
deviation error of the transmitter under test from the test equipment;
b) Determine whether the test result of the 4FSK modulation frequency deviation error
of the transmitter under test complies with the indicator requirements of the 4FSK
modulation frequency deviation error specified in Table 1;
c) According to the provisions of 6.1.2.2, change the operating frequency of the
transmitter under test and repeat the test process from a) to b).
6.2.4 Test method for 4FSK transmitter bit error ratio
Connect the test system as shown in Figure 1. The test equipment may be a comprehensive
tester or a spectrum analyzer with vector analysis function. The test procedure is as follows:
a) The transmitter operates at the maximum transmitter power (conducted) state at a
specified test frequency; select a certain number of slots (greater than or equal to
100), use the test equipment to measure the 4FSK modulation within the valid time
domain envelope time, and read or calculate the 4FSK transmitter bit error ratio of
the transmitter under test from the test equipment;
b) Determine whether the test result of the 4FSK transmitter bit error ratio of the
transmitter under test complies with the indicator requirements of the 4FSK
transmitter bit error ratio specified in Table 1;
c) According to the provisions of 6.1.2.2, change the operating frequency of the
transmitter under test and repeat the test process from a) to b).
6.2.5 Test method for occupied bandwidth
Connect the test system as shown in Figure 1. The test equipment may be a spectrum analyzer
with automatic bandwidth detection function. The test procedure is as follows:
a) The transmitter operates at the maximum transmitter power (conducted) state at a
specified test frequency; select a certain number of slots (greater than or equal to
100), use the test equipment to measure its spectrum within the valid time domain
envelope time, set the resolution bandwidth to 100Hz on the test equipment and the
detection mode to RMS detection, and read the occupied bandwidth of the
transmitter under test from the test equipment;
b) Determine whether the test result of the occupied bandwidth of the transmitter under
test complies with the indicator requirements of the occupied bandwidth specified in
Table 1;
c) According to the provisions of 6.1.2.2, change the operating frequency of the
transmitter under test and repeat the test process from a) to b).
6.2.6 Test method for frequency error
Connect the test system as shown in Figure 1. The test equipment may be a frequency counter,
a comprehensive tester or other test equipment that can measure frequency parameters. The
test procedure is as follows:
a) The transmitter under test operates at the maximum power state without modulation,
and the test equipment measures the carrier frequency of the transmitter under test;
if the transmitter under test cannot operate in a non-modulated state, it is necessary
to demodulate the modulated signal and measure the carrier frequency of the
transmitter under test;
b) The difference between the carrier frequency obtained by the test and the nominal
frequency is the carrier frequency error; determine whether the ratio of this
difference to the nominal frequency complies with the indicator requirements of the
transmitter carrier frequency error specified in Table 1;
c) According to the provisions of 6.1.2.2, change the operating frequency of the
transmitter under test and repeat the test process from a) to b);
d) Repeat the process from a) to c) under extreme conditions.
6.2.7 Test method for transmitter attack time and transmitter release time
Connect the test system as shown in Figure 1. The test equipment may be a comprehensive
tester or other spectrum analyzers with power-time relationship function. The test procedure is
a) Set the receiving frequency of the receiver to the test frequency, turn on the wanted
signal generator 1, set the signal generator to output the standard test signal D-M2
according to the selected test frequency, and turn off the interference signal
generators 2 and 3;
b) Adjust the output power of the wanted signal generator until the input power of the
receiver antenna port is higher than the static sensitivity limit of 33 dB;
c) Record the bit error ratio displayed by the bit error evaluation equipment at this time,
and determine whether this value complies with the requirements of the receiver bit
error ratio at high input level specified in Table 2;
d) Adjust the output power of the wanted signal generator until the input power of the
receiver antenna port is -10 dBm, and repeat the test step c);
e) According to the provisions of 6.1.2.2, change the receiving frequency of the
receiver and repeat the process from a) to c).
6.3.4 Test method for intermodulation response rejection
Connect the test system as shown in Figure 4. The wanted signal generator shall be a signal
generator that can generate D-M2 signals and output data sequences for comparison by the bit
error evaluation equipment.
The interference signal generator 2 generates a continuous wave signal, and the interference
signal generator 3 generates an A-M1 signal. The equipment under test shall provide a
demodulation output data interface. The test procedure is as follows:
a) Set the wanted signal generator to transmit a D-M2 signal, whose frequency is the
receiving frequency of the receiver under test, adjust the interference test signal
frequency, so that the interference signal generator 2 is 50 kHz higher than the
wanted signal frequency and the interference signal generator 3 is 100 kHz higher
than the wanted signal frequency, and combine the two to input to the antenna port
of the receiver under test;
b) Turn off the interference signal generator, adjust the output power of the wanted
signal generator so that the receiver bit error ratio is less than or equal to 5×10-2, and
record the wanted signal power input to the receiver antenna port at this time;
c) Increase the wanted input signal level by 3 dB;
d) Turn on the interference signal generator and adjust its output power synchronously
so that the bit error ratio on the bit error evaluation equipment is less than or equal
to 5×10-2, and record the input power of the interference signal reaching the receiver
antenna port at this time;
e) The intermodulation response immunity is the power of the interference signal input
to the receiver antenna port minus the power of the wanted signal, expressed in
decibels (dB); determine whether this value complies with the indicator
requirements of the receiver intermodulation response immunity specified in Table
2;
f) According to the provisions of 6.1.2.2, change the receiving frequency of the
receiver and repeat the process from a) to e).
6.3.5 Test method for blocking
Connect the test system as shown in Figure 4. The wanted signal generator shall be a signal
generator that can generate D-M2 signals and output data sequences for comparison by the bit
error evaluation equipment. The interference signal generator 2 outputs a single carrier signal.
The equipment under test shall provide a demodulation output data interface. The test
procedure is as follows:
a) Set the wanted signal generator to transmit a D-M2 signal, whose frequency is the
receiving frequency of the receiver under test, and the interference signal generator
to transmit a continuous wave signal, whose frequency is 1 MHz higher than the
receiving frequency of the receiver, and combine the two to input to the antenna port
of the receiver under test;
b) Turn off the interference signal generator, adjust the output power of the wanted
signal generator so that the receiver bit error ratio is less than or equal to 5×10-2, and
record the wanted signal power input to the receiver antenna port at this time;
c) Increase the wanted input signal level by 3 dB;
d) Turn on the interference signal generator and adjust its output power so that the bit
error ratio on the bit error evaluation equipment is less than or equal to 5×10-2, and
record the input power of the interference signal reaching the receiver antenna port
at this time;
e) The blocking is the power of the interference signal input to the receiver antenna
port minus the power of the wanted signal, expressed in decibels (dB); determine
whether this value complies with the indicator requirements of the receiver blocking
specified in Table 2;
f) Set the interference signal frequency to ±1 MHz, ±2 MHz, ±5 MHz and ±10 MHz
from the rated signal of the receiver, perform these tests, and repeat the process from
c) to e);
g) According to the provisions of 6.1.2.2, change the receiving frequency of the
receiver and repeat the process from a) to f).
6.3.6 Spurious response rejection
signal generator so that the receiver bit error ratio is less than or equal to 5×10-2, and
record the wanted signal power input to the receiver antenna port at this time;
c) Increase the wanted input signal level by 3 dB;
d) Turn on the interference signal generator and adjust its output power so that the bit
error ratio on the bit error evaluation equipment is less than or equal to 5×10-2, and
record the input power of the interference signal reaching the receiver antenna port
at this time;
e) The spurious response immunity is the power of the interference signal input to the
receiver antenna port minus the power of the wanted signal, expressed in decibels
(dB); determine whether this value complies with the indicator requirements of the
receiver spurious response immunity specified in Table 2;
f) According to the provisions of 6.1.2.2, change the receiving frequency of the
receiver and repeat the process from a) to e).
6.3.7 Test method for co-channel rejection
Connect the test system as shown in Figure 4. The wanted signal generator shall be a signal
generator that can generate D-M2 signals and output data sequences for comparison by the bit
error evaluation equipment. The interference signal generator 2 can generate A-M1 signals.
The equipment under test shall provide a demodulation output data interface. The test
procedure is as follows:
a) Set the wanted signal generator to transmit a D-M2 signal, whose frequency is the
receiving frequency of the receiver under test, and the interference signal generator
to transmit an A-M1 signal, whose frequency is the receiving frequency of the
receiver under test, and combine the two to input to the antenna port of the receiver
under test;
b) Turn off the interference signal generator, adjust the output power of the wanted
signal generator so that the receiver bit error ratio is less than or equal to 5×10-2, and
record the wanted signal power input to the receiver antenna port at this time;
c) Increase the wanted input signal level by 3 dB;
d) Turn on the interference signal generator and adjust its output power so that the bit
error ratio on the bit error evaluation equipment is less than or equal to 5×10-2, and
record the input power of the interference signal reaching the receiver antenna port
at this time;
e) The co-channel rejection is the power of the interference signal input to the receiver
antenna port minus the power of the wanted signal, expressed in decibels (dB);
determine whether this value complies with the indicator requirements of the
receiver co-channel rejection specified in Table 2;
f) According to the provisions of 6.1.2.2, change the receiving frequency of the
receiver and repeat the process from a) to d).
6.3.8 Test method for adjacent channel selectivity
Connect the test system as shown in Figure 4. The wanted signal generator shall be a signal
generator that can generate D-M2 signals and output data sequences for comparison by the bit
error evaluation equipment. The interference signal generator 2 can generate A-M1 signals.
The equipment under test shall provide a demodulation output data interface. The test
procedure is as follows:
a) Set the wanted signal generator to transmit a D-M2 signal, whose frequency is the
receiving frequency of the receiver under test, and the interference signal generator
to transmit an A-M1 signal, whose frequency is the adjacent channel center
frequency of the receiving frequency of the receiver under test, and combine the two
to input to the antenna port of the receiver under test;
b) Turn off the interference signal generator, adjust the output power of the wanted
signal generator so that the receiver bit error ratio is less than or equal to 5×10-2, and
record the wanted signal power input to the receiver antenna port at this time;
c) Increase the wanted input signal level by 3 dB;
d) Turn on the interference signal generator and adjust its output power so that the bit
error ratio on the bit error evaluation equipment is less than or equal to 5×10-2, and
record the input power of the interference signal reaching the receiver antenna port
at this time;
e) The adjacent channel selectivity is the power of the interference signal input to the
receiver antenna port minus the power of the wanted signal, expressed in decibels
(dB); determine whether this value complies with the indicator requirements of the
receiver adjacent channel selectivity specified in Table 2;
f) According to the provisions of 6.1.2.2, change the receiving frequency of the
receiver and repeat the process from a) to d).
6.3.9 Test method for receiver spurious emission
6.3.9.1 Test method for antenna port spurious emission
Connect the test system as shown in Figure 1. The test equipment is a spectrum analyzer, and
the measurement frequency band of the conducted spurious emission is 9 kHz ~ 12.75 GHz.
The resolution bandwidth/video bandwidth settings of the spectrum analyzer shall be as
shown in Table 7.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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