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Joint Observation

The Belt and Road Routes

In August 2017, Test and Assessment Research Center of China Satellite Navigation Office as the leading unit of the monitoring and assessment working group of the China-Russia Satellite Navigation Strategic Cooperation Project Committee jointly carried out the joint observation of BDS and GLONASS along an economic belt of the Silk Way.

1. Observation Routes

Chinese dynamic observation route is from Shaanxi, Xi'an to Huoerguosi in Xinjiang, routing Xi'an, Pingliang, Lanzhou, Wuwei, Zhangye, Jiayuguan, Dunhuang, Hami, Urumqi, Horgos and other major cities along the Silk Way, and ending in Horgos. The route is about 3462km, for a period of 10 days.

Chinese dynamic observation route

Major cities of the Chinese dynamic observation

The experiment within the territory of Russia makes a round trip of 7,000km embracing Moscow, Ufa and Novosibirsk, routing Mofer Lakimir , Nizhny Novgorod, Cheboksare, Kazan, Ufa, Chelyabinsk, Kurgan, after arriving in Novosibirsk, return to Moscow along Omsk, Chelyabinsk, Orenburg, Samara, Penza, and Ryazan.

Russian dynamic observation route

Major cities of the Russian dynamic observation

2. Observation Contents

The Chinese observation contents include standard positioning accuracy, visible satellite number, PDOP value, velocity accuracy, and the additional RDSS success rate testing, single frequency and multi frequency, pseudo range and carrier phase, single system and multi system positioning, and other application modes. application of various models of single frequency and multi frequency, pseudorange and carrier phase, single system and multi system positioning. See the following table for specific observations.

Chinese dynamic observation contents

No. Scenery Location Indicators Items
1 Dynamic Observation Xi'an to Horgos Positioning Accuracy • BDS B1I, B2I, B3I;
• GLONASS G1, G2;
• BDS B1I+GLONASS G1
2 Velocity Accuracy • BDS B1I, B2I, B3I;
• GLONASS G1, G2;
• BDS B1I+GLONASS G1
3 PDOP Value • BDS;
• GLONASS;
• BDS+GLONASS
4 PDOP Availability(PODP≤6) • BDS;
• GLONASS;
• BDS+GLONASS
5 Visible Satellite Number • BDS;
• GLONASS;
• BDS+GLONASS
6 Service Availability • BDS;
• GLONASS;
• BDS+GLONASS
7 RDSS Success Rate • User Positioning Accuracy;
• RDSS Communication Success Rate
3. Observation Equipment

The Chinese observation system is mainly composed of the dynamic test vehicle and the observation equipment.

Chinese dynamic test vehicle

Chinese observation equipment mainly includes all band navigation antenna, dynamic reference receiver, high-precision receiver, power divider, switchboard and test computer, etc.. The full band navigation antenna is fixed on the roof, and the other observation equipments are deployed in the vehicle. The on-board 220V AC power supply is adopted. Using star based enhancement equipment as a large range of dynamic observation benchmark, the benchmark accuracy is better than 1m.

Chinese dynamic observation equipment

4. Observation Process

Chinese dynamic observation tracking

No. Routing Cities Distance Date Rest Land
1 Xi'an to Pingliang 320km 2017.08.07 Pingliang
2 Pingliang to Lanzhou 323km 2017.08.08 Lanzhou
3 Lanzhou to Zhangye 506km 2017.08.09 Zhangye
4 Zhangye to Dunhuang 664km 2017.08.10 Dunhuang
5 Dunhuang to Hami 420km 2017.08.12 Hami
6 Hami to Urumqi 587km 2017.08.13 Urumqi
7 Urumqi to Khorgos 642km 2017.08.14 Khorgos
8 Return to Urumqi from Khorgos 2017.08.15 Urumqi
5. Results

(1) BDS B1I Positioning Accuracy

Distribution of horizontal accuracy of BDS B1I along observation routes

Distribution of vertical accuracy of BDS B1I along observation routes

BDS B1I standard positioning accuracy

(2) BDS B2I Positioning Accuracy

BDS B2I standard positioning accuracy

(3) Visible Satellite Number and PDOP

Change sequence chart of visible satellite number and PDOP

Statistical accuracy of positioning results for BDS B1I and B2I (m)

BDS-B1I BDS-B2I
dH dV dH dV
RMS 95% RMS 95% RMS 95% RMS 95%
1.60 2.71 2.15 4.15 1.91 3.21 2.55 4.88

The observation results show that the standard positioning of BDS frequency points is stable and reliable. The horizontal positioning accuracy of BDS B1I is 2.71M (95%), and the altitude positioning accuracy is 4.15M (95%), which meets the requirements of the BeiDou Navigation Satellite System Open Service Performance Standard (Version 1.0). In the observation process, the average number of visible satellites is about 9, and at most times (95%) visible satellites exceed 7 stars. The probability of PDOP is 96.38% , and at most times (95%) PDOP is 5.70.


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