Beidou positioning function testing system for electric bicycles

1、 Overview of Testing System:

With the widespread application of electric bicycles, their safety and management issues are becoming increasingly prominent. The new national standard GB17761-2024 "Technical Specification for Safety of Electric Bicycles" stipulates that electric bicycles used for urban logistics, commercial leasing and other business activities should have Beidou module positioning function, and should be installed in fixed components of electric bicycles that are not easily damaged, and have anti disassembly and anti tampering functions. Aim to improve the anti-theft performance and safety management level of vehicles through technological means, facilitate consumers to understand key information such as vehicle location in real time, and monitor and alarm for abnormal situations.

2、 Technical features of the testing system:

Beidou positioning function testing system for electric bicyclesIt is a testing system designed for the testing and experimental platform of Beidou satellite navigation system products. The system can meet the needs of scientific research, production and manufacturing, finished product testing, and testing and certification. It has the ability to conduct wired conduction or wireless radiation testing on the tested terminal, and supports the functional and performance testing of Beidou navigation terminal, OEM board, and baseband chip. This system complies with the technical requirements of the "Safety Technical Specification for Electric Bicycles" and can achieve automation of the testing process, analysis and evaluation of testing data, and one click generation of testing reports.

3、 Test system content

Beidou positioning function testing system for electric bicyclesThe Beidou positioning module testing system for electric bicycles, also known as the Beidou positioning and safety monitoring simulation system for electric bicycles, meets the performance testing requirements of clauses 6.6.1, 6.6.2, 6.6.3, and Appendix B of GB17761-2024 "Technical Specification for Safety of Electric Bicycles". The relevant testing items for the Beidou positioning module are as follows:

1) Beidou module receives signal detection;

2) Beidou module positioning accuracy detection;

3) Beidou module speed measurement accuracy detection;

4) Beidou module time reporting accuracy detection;

5) Cooperate with communication reporting function testing;

6) Hot start time;

7) Cold start time;

8) Signal sensitivity.

The composition is as follows:

3、 Main technical parameters of the testing system:

3.1 Specification parameters of GNSS signal simulator:

3.1.1 Product Overview:

The GS-BDK307 GNSS signal simulator is a cost-effective multi-channel Beidou/GPS satellite navigation signal generator designed specifically for detecting objects such as electric bicycles, electric vehicles, drones, in car navigation systems, taxis, shared bicycles, and electronic fence equipment.

This simulator is widely used in various aspects of the research, development, production, and testing process of satellite navigation user equipment. The testing items that can be completed include: signal frequency point, signal sensitivity, positioning accuracy, speed measurement accuracy, hot start time, cold start time, lock loss and relocation time, etc., which will greatly improve work efficiency.

3.1.2 Equipment appearance:

3.1.3 Instrument functional features:

1) Having 16 channels for generating Beidou satellite B1C signals (B1C refers to the navigation signal with a center frequency of 1575.42MHz and a bandwidth of 32.736 MHz in the Beidou satellite navigation system);

2) Having 16 channels for generating Beidou satellite B2a signals (B2a refers to the navigation signal with a center frequency of 1176.45MHz and a bandwidth of 20.46MHz in the Beidou satellite navigation system);

3) Having 16 channels for generating Beidou satellite B1I signals (B1I refers to the navigation signal with a center frequency of 1561.098 MHz and a bandwidth of 4.092 MHz in the Beidou satellite navigation system);

4) Having 16 channels for generating Beidou satellite B3I signals (B3I refers to the navigation signal with a center frequency of 1268.52MHz and a bandwidth of 20.46MHz in the Beidou satellite navigation system);

5) Having 16 channels for generating Beidou satellite GPS L1 signals (GPS L1 refers to the navigation signal with a center frequency of 1575.42MHz, wavelength of 19.03cm, and bandwidth of 2MHz in the Beidou satellite navigation system);

6) Can simulate the satellite navigation signals received by the receiver under high dynamic and static conditions.

7) Equipped with satellite selection function, users can choose any combination of satellites from various navigation systems according to their needs.

8) It has a signal generation channel gating function, where users can choose to use specific channels to generate navigation signals, and can also individually set the strength of the signals generated by each signal channel.

9) It has a navigation signal attenuation control function, and users can individually set the attenuation amount for each type of satellite navigation analog signal output.

10) It has the function of setting the receiver's motion trajectory, and users can set the motion trajectory and load the typical motion trajectory through the upper computer of the simulator, which is convenient for experimental users to use.

11) Equipped with real-time status display function of the simulator, it displays information such as the type, quantity, number, elevation angle, pseudorange, health status, etc. of the satellite currently being simulated to the user. It also shows the sky view of the online satellite and the receiver motion trajectory view to the user.

12) Equipped with RF cable interface and forwarding antenna interface, users can choose to receive satellite analog signals in wireless or wired mode.

13) Equipped with testing kits for lost lock positioning time, hot start time, and cold start time.

14) Built in industrial computer control operation.

3.1.4 Technical indicators:

a) Output center frequency (according to configuration):

1) BDS B1C：1575.42MHz

2) BDS B2A：1176.45 MHz

3) BDS B1I：1561.098MHz

4) BDS B3I：1268.52MHz

5) GPS L1：1575.42MHz

b) Signal dynamic range:

1) Maximum speed: ± 15km/s;

2) Maximum acceleration: ± 1000m/s2;

3) Maximum acceleration speed: ± 1000m/s3.

c) Signal accuracy:

1) Pseudo range phase accuracy: ≤ 0.05m;

2) Pseudo range change rate accuracy: ≤ 0.005m/s;

3) Channel consistency: ≤ 0.1m (code), ≤ 0.005m (carrier);

4) I and Q branch carrier phase modulation orthogonality: ≤ 3 ° (1 σ).

d) Signal quality:

1) Harmonic suppression system: ≥ 40dBc;

2) Carrier suppression system: ≥ 40dBc;

3) Single sideband phase noise SSB: ≥ 90dBc/Hz (10kHz~100kHz);

4) Frequency stability: ≤± 50ppb @ 25 ℃.

e) Signal output power:

1) RF power output range: -160 to -50dBm;

2) Output power control range:>100dB;

3) Power output setting error: ≤± 2 dB;

4) Minimum adjustable resolution: 1dB;

3.1.5 External interface:

RF output: 1 N-type connector

Antenna interface: 1-channel N-type connector

PPS interface: 1-channel SMA

RS232 interface: 4-channel DB9

USB interface: 4 channels

Network interface: 1 RJ45

VGA interface: 1 channel

HDMI interface: 1 channel

3.1.6 Instrument power supply: Input voltage: AC220V ± 10%, power consumption:<100W

3.1.7 Environmental adaptability

Working temperature: -20 ℃~+70 ℃

Storage temperature: -20 ℃ to+80 ℃

3.1.8 Structural characteristics: Whole machine weight: ≤ 10kg; size: 4U.

3.2 Specification parameters of GNSS signal repeater:

GNSS signal repeater is a specialized instrument responsible for forwarding outdoor Beidou satellite mobile communication signals to shielded indoor environments.

3.2.1 Simulators support frequency bands and ranges

Frequency: DCS,

Upward: 1710-1785

Downward: 1805-1880;

Frequency: NR41,

Upstream: 2496-2690

Downward: 2496-2690;

Frequency: NR42,

Upstream: 3400-3600

Downward: 3400-3600;

Output power:

Upstream: 20 ± 2 dBm

Downward: 25 ± 2 dBm;

Gain:

Upstream: 60+3 dB

Downstream: 75+3 dB;

Bandwidth: 75M/194M/200M;

Working temperature: -10 ℃~55 ℃;

Protection level: IP40.

4. Test site selection instructions:

There are three types of testing sites, corresponding to three different testing effects, as follows:

4.1 Radio anechoic chamber

4.2 Electromagnetic shielding room

4.3 Wired testing

Note: The construction cost of the testing site is separately calculated. If you need to construct the corresponding site environment, please consult our sales engineer.