CN105158776A - Method for testing OTA of Beidou equipment assisted by communication network - Google Patents

Abstract

The present invention relates to a system and a method for testing OTA (Over-the-Air) of Beidou equipment assisted by a communication network. The system comprises a comprehensive test terminal, a measuring antenna, two groups of communication antennas, a Beidou satellite signal source, a mobile network simulator, a rotary table, a rotary table controller, and a fully anechoic chamber. The method comprises the following testing steps: 1, testing a spatial directional diagram of carrier-to-noise ratios; 2, linearizing the spatial directional diagram of carrier-to-noise ratios; 3; testing single point equivalent isotropic sensitivity; and 4, calculating to obtain spatial total isotropic sensitivity. The system and the method of the present invention solve the problem of testing OTA of Beidou equipment assisted by a communication network through integral design of the system, test parameter setting for the spatial directional diagram of carrier-to-noise ratios, and test parameter setting for the single point equivalent isotropic sensitivity, and a testing result can reflect the performance of the equipment in spatial three dimensional directions.

Description

The Big Dipper device space performance test methods that a kind of communication network is auxiliary

Technical field

The Beidou navigation device space performance system that space Performance Test System and the method, particularly a kind of communication network that the present invention relates to a kind of Beidou navigation equipment are assisted and method of testing.

Background technology

The Beidou navigation location that communication network is auxiliary is a kind of technology combining satellite information and communication network information and position terminal.Do not rely on Beidou satellite navigation and positioning system merely when navigator fix, communication network transmission auxiliary positioning information can also be utilized, can primary positioning time be shortened, improve receiving sensitivity.

Space performance test (Over-the-Air, OTA) fully anechoic chamber can be utilized to carry out the three dimensions performance of testing apparatus, and by the test to different conditions such as free space, the number of people, staff, can simulate the operation of people to the impact of space performance, therefore space performance test has very important meaning for the Big Dipper equipment performance that assessment communication network is auxiliary.

For the space performance of antenna, usually use total omnidirectional sensitivity (TotalIsotropicSensitivity, TIS) to weigh, the three dimensions receiving sensitivity performance of reflection antenna.The space performance test of current cellular communication antenna and AGPS antenna can according to international standard " CTIA3.3, TestPlanforWirelessDeviceOver-the-AirPerformance, 2013-10 " test, and for the Big Dipper equipment that communication network is assisted, there is no testing standard at present can reference.Therefore, existing antenna space performance test standard can only for cellular communication antenna and AGPS antenna, not for the Beidou antenna that communication network is auxiliary.

Due to reasons such as Beidou receiver and the GPS differences in sensitivity, the parameters such as the parameter set when the Big Dipper device space performance of test communications network assistance, particularly satellite-signal performance number are different from arranging certainty during the performance test of AGPS space.Therefore, the Big Dipper device space performance that current existing AGPS space performance testing standard carrys out test communications network assistance can not directly be applied.

Summary of the invention

The Big Dipper device space performance methodology of assisting for current shortage communication network and the present situation of standard, the object of this invention is to provide the auxiliary Big Dipper device space Performance Test System of a kind of communication network and method of testing.

The object of the present invention is achieved like this: the Big Dipper device space Performance Test System that a kind of communication network is auxiliary, comprise the fully anechoic chamber for simulating free space environment, it is characterized in that: a turntable is installed in fully anechoic chamber, turntable is laid tested subscriber computer, simultaneously, be provided with in fully anechoic chamber and measure antenna and two group communication antennas, one group communication antenna is the emitting antenna for launching Big Dipper satellite signal, and another group communication antenna is the dual-mode antenna for receiving and dispatching mobile network signals;

Big Dipper satellite signal source connects emitting antenna, produces Beidou satellite navigation signal for simulating, emulation satellite transit track, air time delay error and user movement track, builds navigation receiving terminal simulation work environment in laboratory conditions;

Mobile network's simulator connects dual-mode antenna, for anolog base station signal, sends auxiliary positioning information;

Turntable controller connects turntable, rotating, testing the carrier-to-noise ratio of tested subscriber computer in different angles, receiving sensitivity index for controlling turntable;

Integration test terminal connects Big Dipper satellite signal source, mobile network's simulator, turntable controller and test antenna, for controlling above-mentioned test instrumentation and tested subscriber computer, analytical test result.

The Big Dipper device space performance test methods that a kind of communication network of the present invention is auxiliary, test macro comprises the fully anechoic chamber for simulating free space environment, one turntable is installed in fully anechoic chamber, turntable is laid tested subscriber computer, simultaneously, be provided with in fully anechoic chamber and measure antenna and two group communication antennas, a group communication antenna is the emitting antenna for launching Big Dipper satellite signal, and another group communication antenna is the dual-mode antenna for receiving and dispatching mobile network signals;

Big Dipper satellite signal source connects emitting antenna, produces Beidou satellite navigation signal for simulating, emulation satellite transit track, air time delay error and user movement track, builds navigation receiving terminal simulation work environment in laboratory conditions;

Mobile network's simulator connects dual-mode antenna, for anolog base station signal, sends auxiliary positioning information;

Turntable controller connects turntable, rotating, testing the carrier-to-noise ratio of tested subscriber computer in different angles, receiving sensitivity index for controlling turntable;

Integration test terminal connects Big Dipper satellite signal source, mobile network's simulator, turntable controller and test antenna, for controlling above-mentioned test instrumentation and tested subscriber computer, analytical test result;

Testing procedure is:

The first step, carrier-to-noise ratio spatial pattern ai is tested: first arrange the first scenario parameters, and after setting parameter, turntable controller controls turntable to start to rotate, and test macro obtains the carrier-to-noise ratio numerical value of Big Dipper equipment on each position of three dimensions;

Second step, carrier-to-noise ratio direction in space linearization: tested Big Dipper equipment is placed on the maximum position of episphere carrier-to-noise ratio numerical value, satellite power is set to certain numerical value, then be that step-length reduces gradually with 1dB, until system can not obtain carrier-to-noise ratio numerical value from terminal, in record satellite power change procedure, the corresponding relation of magnitude of power and carrier-to-noise ratio numerical value, obtains one group of performance number and one group of corresponding carrier-to-noise ratio value;

3rd step, single-point equivalence omnidirectional sensibility test: arrange the second scenario parameters, then, on the position that episphere carrier-to-noise ratio numerical value is maximum, big-dipper satellite power declines with a fixed step size, positions under each power rating to tested Big Dipper equipment; Positioning result is compared calculating with actual position by test macro, obtains positioning error; Under each power rating, carry out multiple bearing, acquisition receiving sensitivity is the single-point equivalence omnidirectional sensibility on best direction;

4th step, calculate space total omnidirectional sensitivity: according to the test result of the single-point equivalence omnidirectional sensibility in the test result of first step carrier-to-noise ratio spatial pattern ai, the linearizing result of second step and the 3rd step preferably on direction, calculate sensitivity of other points on three-dimensional sphere; During calculating, utilize linearization result, obtain corresponding satellite power value according to the carrier-to-noise ratio on each position, then according to the relation of the satellite power value on this position and the satellite power value on best direction, calculate the single-point equivalence omnidirectional sensibility on this position; In like manner, the single-point equivalence omnidirectional sensibility on all positions is calculated; Then calculate total omnidirectional sensitivity, formula is as follows:

$TIRS\widetilde{=}\frac{2NM}{\mathrm{\π}\underset{i=2}{\overset{4}{\Σ}}\underset{j=0}{\overset{M-1}{\Σ}}\[\frac{1}{{\mathrm{EIS}}_{\mathrm{\θ}}({\mathrm{\θ}}_i,{\mathrm{\φ}}_j)}+\frac{1}{{\mathrm{EIS}}_{\mathrm{\φ}}({\mathrm{\θ}}_i,{\mathrm{\φ}}_j)}\]\sin \left({\mathrm{\θ}}_i\right)}$

Wherein, N is the space-number on Theta direction, and M is the space-number on Phi direction, and two numerical value are all even numbers; EIS is the single-point equivalence omnidirectional sensibility on sphere under each polarization mode on each position.

The present invention is by arranging test macro global design and the setting of carrier-to-noise ratio spatial pattern ai test parameter, single-point equivalence omnidirectional sensibility test parameter, solve the Big Dipper device space performance test difficult problem that communication network is auxiliary, test result can reflect the performance of equipment on space three-dimensional direction.

Accompanying drawing explanation

Fig. 1 test macro schematic diagram

Embodiment

The Big Dipper device space performance test that communication network is assisted is tested by fully anechoic chamber, and test macro as shown in Figure 1.

Wherein mainly comprise integration test terminal, measure antenna, two group communication antennas, Big Dipper satellite signal source, mobile network's simulator, turntable controller and microwave dark room etc.Integration test terminal is for controlling test instrumentation and tested subscriber computer, analytical test result etc., communication antenna one is for launching Big Dipper satellite signal, one for receiving and dispatching mobile network signals, Big Dipper satellite signal source produces Beidou satellite navigation signal for simulating, emulation satellite transit track, air time delay error and user movement track, build navigation receiving terminal simulation work environment in laboratory conditions, mobile network's simulator is used for anolog base station signal, send auxiliary positioning information, turntable controller controls turntable and rotates, test the carrier-to-noise ratio of tested subscriber computer in different angles, the indexs such as receiving sensitivity, fully anechoic chamber is for simulating free space environment.Testing procedure is as follows:

The first step, carrier-to-noise ratio spatial pattern ai is tested

During the test of carrier-to-noise ratio spatial pattern ai, scenario parameters arranges as shown in table 1.After setting parameter, turntable controller controls turntable to start to rotate, and test macro obtains the carrier-to-noise ratio numerical value of Big Dipper equipment on each position of three dimensions.Carrier-to-noise ratio on each position is by doing on average to obtain to the carrier-to-noise ratio of all visible satellites, in order to reduce uncertainty, duplicate measurements repeatedly, can being averaged to measurement result repeatedly if desired on each position again.

Table 1 first scenario parameters

Parameter	Unit	Value
			Number of satellites	-	6
HDOP scope	-	1.4to 2.1
			Path status	-	AWGN

Assisted error scope time thick	seconds	±2
			The signal power of all big-dipper satellites	dBm	-133

Second step, carrier-to-noise ratio direction in space linearization

Tested Big Dipper equipment is placed on the maximum position of episphere carrier-to-noise ratio numerical value, satellite power is set to certain numerical value, then be that step-length reduces with 1dB, till system can not obtain carrier-to-noise ratio numerical value from terminal, the corresponding relation of magnitude of power and carrier-to-noise ratio numerical value in record satellite power change procedure, what obtain is one group of performance number and one group of corresponding carrier-to-noise ratio value.

Carrier-to-noise ratio numerical value can be obtained by multiple distinct methods, if equipment under test support, wireless signal can be utilized to report test macro, or equipment under test first records all carrier-to-noise ratio numerical value, then by data cable or wireless connections, the data of storage are extracted.Two kinds of modes can be applied, but need to select same mode when testing with carrier-to-noise ratio spatial pattern ai.

On each measurement point, the corresponding relation of power and carrier-to-noise ratio value all needs to take multiple measurements averages to reduce uncertainty.

3rd step, the test of single-point equivalence omnidirectional sensibility

On the position that episphere carrier-to-noise ratio numerical value is maximum, the second scenario parameters is set by table 2.Big-dipper satellite power declines with a fixed step size, and under each power rating, tested Big Dipper equipment positions.Positioning result is compared calculating with actual position by test macro, obtains positioning error.Need to carry out multiple bearing under each power rating, location number of times is set to certain numerical value, as 100 times.If the positioning result error of 95% is all within the limit value of regulation, then continue reduce satellite power and judge positioning result, until the ratio of positioning error within limit value is lower than 95%, then record is for the last time lower than single-point equivalence omnidirectional sensibility (EffectiveIsotropicSensitivity, EIS) that the receiving sensitivity before 95% is on best direction.

Table 2 second scenario parameters

Parameter	Unit	Value
			Number of satellites	-	6
HDOP scope	-	1.4to 2.1
			Path status	-	AWGN
Assisted error scope time thick	seconds	±2
			The wherein signal power of a big-dipper satellite	dBm	-136
The signal power of other big-dipper satellites	dBm	-145
			Response time	seconds	20.3
Positioning error	m	101.3
			Position success rate		95％
Step-length	dB	0.5

Note having the power setting of a satellite to be than other satellite power height 9dB in all satellites, be as the criterion with lower satellite power during single-point equivalence omnidirectional sensibility test.All need Beidou receiver cold start-up during each location.

Single-point equivalence omnidirectional sensibility can be obtained by multiple distinct methods, if terminal support, test macro can be reported by the mode of wireless signal, or terminal first records the location probability of failure under all each power, then by data cable or wireless connections, the data of storage are extracted.

4th step, calculates space total omnidirectional sensitivity

According to the test result of the single-point equivalence omnidirectional sensibility in the test result of first step carrier-to-noise ratio spatial pattern ai, the linearizing result of second step and the 3rd step preferably on direction, calculate sensitivity of other points on three-dimensional sphere.During calculating, utilize linearization result, obtain corresponding satellite power value according to the carrier-to-noise ratio on each position, then according to the relation of the satellite power value on this position and the satellite power value on best direction, calculate the single-point equivalence omnidirectional sensibility on this position.In like manner, the single-point equivalence omnidirectional sensibility on all positions is calculated.Then calculate total omnidirectional sensitivity, formula is as follows.

$TIRS\widetilde{=}\frac{2NM}{\mathrm{\π}\underset{i=2}{\overset{4}{\Σ}}\underset{j=0}{\overset{M-1}{\Σ}}\[\frac{1}{{\mathrm{EIS}}_{\mathrm{\θ}}({\mathrm{\θ}}_i,{\mathrm{\φ}}_j)}+\frac{1}{{\mathrm{EIS}}_{\mathrm{\φ}}({\mathrm{\θ}}_i,{\mathrm{\φ}}_j)}\]\sin \left({\mathrm{\θ}}_i\right)}$

Wherein, N is the space-number on Theta direction, and M is the space-number on Phi direction, and two numerical value are all even numbers.EIS is the single-point equivalence omnidirectional sensibility on sphere under each polarization mode on each position.

The innovation point of Big Dipper device space performance test methods of the present invention is as follows:

1) Design of Test System.The present invention devises a Big Dipper device space Performance Test System, and test result can reflect the performance of equipment on space three-dimensional direction.

2) carrier-to-noise ratio spatial pattern ai test parameter is arranged.The difference in receiving sensitivity etc. due to Beidou receiver and GPS, method proposed by the invention have employed the optimum configurations different from existing GPS device carrier-to-noise ratio spatial pattern ai testing standard when Big Dipper equipment carrier-to-noise ratio spatial pattern ai is tested, particularly satellite-signal power setting, specifically in table 1.Namely the present invention proposes a kind of optimum configurations being applicable to the test of Big Dipper equipment carrier-to-noise ratio spatial pattern ai.

3) single-point equivalence omnidirectional sensibility test parameter is arranged.Method proposed by the invention have employed the optimum configurations different from existing GPS device single-point equivalence omnidirectional sensibility testing standard when Big Dipper equipment single-point equivalence omnidirectional sensibility test, particularly satellite-signal power setting, specifically in table 2.Namely the present invention proposes a kind of optimum configurations being applicable to the test of Big Dipper equipment single-point equivalence omnidirectional sensibility.

Claims (4)

1. the Big Dipper device space Performance Test System that a communication network is auxiliary, comprise the fully anechoic chamber for simulating free space environment, it is characterized in that: a turntable is installed in fully anechoic chamber, turntable is laid tested subscriber computer, simultaneously, be provided with in fully anechoic chamber and measure antenna and two group communication antennas, a group communication antenna is the emitting antenna for launching Big Dipper satellite signal, and another group communication antenna is the dual-mode antenna for receiving and dispatching mobile network signals;

Big Dipper satellite signal source connects emitting antenna, produces Beidou satellite navigation signal for simulating, emulation satellite transit track, air time delay error and user movement track, builds navigation receiving terminal simulation work environment in laboratory conditions;

Mobile network's simulator connects dual-mode antenna, for anolog base station signal, sends auxiliary positioning information;

Turntable controller connects turntable, rotating, testing the carrier-to-noise ratio of tested subscriber computer in different angles, receiving sensitivity index for controlling turntable;

Integration test terminal connects Big Dipper satellite signal source, mobile network's simulator, turntable controller and test antenna, for controlling above-mentioned test instrumentation and tested subscriber computer, analytical test result.

2. the Big Dipper device space performance test methods that a communication network is auxiliary, it is characterized in that: test macro comprises the fully anechoic chamber for simulating free space environment, one turntable is installed in fully anechoic chamber, turntable is laid tested subscriber computer, simultaneously, be provided with in fully anechoic chamber and measure antenna and two group communication antennas, a group communication antenna is the emitting antenna for launching Big Dipper satellite signal, and another group communication antenna is the dual-mode antenna for receiving and dispatching mobile network signals;

Big Dipper satellite signal source connects emitting antenna, produces Beidou satellite navigation signal for simulating, emulation satellite transit track, air time delay error and user movement track, builds navigation receiving terminal simulation work environment in laboratory conditions;

Mobile network's simulator connects dual-mode antenna, for anolog base station signal, sends auxiliary positioning information;

Turntable controller connects turntable, rotating, testing the carrier-to-noise ratio of tested subscriber computer in different angles, receiving sensitivity index for controlling turntable;

Integration test terminal connects Big Dipper satellite signal source, mobile network's simulator, turntable controller and test antenna, for controlling above-mentioned test instrumentation and tested subscriber computer, analytical test result;

Testing procedure is:

The first step, carrier-to-noise ratio spatial pattern ai is tested: first arrange the first scenario parameters, and after setting parameter, turntable controller controls turntable to start to rotate, and test macro obtains the carrier-to-noise ratio numerical value of Big Dipper equipment on each position of three dimensions;

Second step, carrier-to-noise ratio direction in space linearization: tested Big Dipper equipment is placed on the maximum position of episphere carrier-to-noise ratio numerical value, satellite power is set to certain numerical value, then be that step-length reduces gradually with 1dB, until system can not obtain carrier-to-noise ratio numerical value from terminal, in record satellite power change procedure, the corresponding relation of magnitude of power and carrier-to-noise ratio numerical value, obtains one group of performance number and one group of corresponding carrier-to-noise ratio value;

3rd step, single-point equivalence omnidirectional sensibility test: arrange the second scenario parameters, then, on the position that episphere carrier-to-noise ratio numerical value is maximum, big-dipper satellite power declines with a fixed step size, positions under each power rating to tested Big Dipper equipment; Positioning result is compared calculating with actual position by test macro, obtains positioning error; Under each power rating, carry out multiple bearing, acquisition receiving sensitivity is the single-point equivalence omnidirectional sensibility on best direction;

4th step, calculate space total omnidirectional sensitivity: according to the test result of the single-point equivalence omnidirectional sensibility in the test result of first step carrier-to-noise ratio spatial pattern ai, the linearizing result of second step and the 3rd step preferably on direction, calculate sensitivity of other points on three-dimensional sphere; During calculating, utilize linearization result, obtain corresponding satellite power value according to the carrier-to-noise ratio on each position, then according to the relation of the satellite power value on this position and the satellite power value on best direction, calculate the single-point equivalence omnidirectional sensibility on this position; In like manner, the single-point equivalence omnidirectional sensibility on all positions is calculated; Then calculate total omnidirectional sensitivity, formula is as follows:

$TIRS\≅\frac{2NM}{\mathrm{\π}\underset{i=2}{\overset{4}{\Σ}}\underset{j=0}{\overset{M-1}{\Σ}}\[\frac{1}{{\mathrm{EIS}}_{\mathrm{\θ}}({\mathrm{\θ}}_i,{\mathrm{\φ}}_j)}+\frac{1}{{\mathrm{EIS}}_{\mathrm{\φ}}({\mathrm{\θ}}_i,{\mathrm{\φ}}_j)}\]\sin \left({\mathrm{\θ}}_i\right)}$

Wherein, N is the space-number on Theta direction, and M is the space-number on Phi direction, and two numerical value are all even numbers; EIS is the single-point equivalence omnidirectional sensibility on sphere under each polarization mode on each position.

3. the Big Dipper device space performance test methods that communication network according to claim 2 is auxiliary, is characterized in that: the first scenario parameters is arranged as following table

Parameter Unit Value Number of satellites - 6 HDOP scope - 1.4to2.1 Path status - AWGN Assisted error scope time thick seconds ±2 The signal power of all big-dipper satellites dBm -133

。

4. the Big Dipper device space performance test methods that the communication network according to Claims 2 or 3 is auxiliary, is characterized in that: the second scenario parameters is arranged as following table

Parameter Unit Value Number of satellites - 6 HDOP scope - 1.4to2.1 Path status - AWGN Assisted error scope time thick seconds ±2 The wherein signal power of a big-dipper satellite dBm -136 The signal power of other big-dipper satellites dBm -145 Response time seconds 20.3 Positioning error m 101.3 Position success rate 95％ Step-length dB 0.5

。