NS210MMulti antenna synchronizationGPSThe intermediate frequency signal sampler is a successor to Dongfang Lianxing CompanyNS210A、NS210BAfterwards, the latest products will be launched to meet customer needs. Besides havingNS210AIn addition to all functions,NS210MEquipped with four antenna synchronous sampling function, it ensures strict consistency of four data sampling channels, providing a reliable data source for high-precision positioning, attitude monitoring, and space weather research.

Function Description

NS210MEquipped with four RF heads, capable of connecting four channelsGPSSignal. Realize synchronous reception with single or multiple antennas (up to four antennas)GPS L1Signal, down conversion, generation2Bit data stream, transmitted at high speedUSBInterface sent toPCMachine, stored in the hard drive. existPCOn board, implemented through software methodsGPSDesign and implementation of signal search, carrier stripping, code stripping, navigation message extraction, and the entire receiver algorithm. Unique variable rate2bitGPSDigital intermediate frequency playback capability, forGPSThe development and debugging of receivers provide stable, reliable, and reusable signal sources, which play a crucial roleGPSPart of the function of a satellite signal generator. The unique four antennas work under a unified clock source, ensuring strict consistency in multi-channel data sampling and providing reliable data sources for high-precision positioning, attitude monitoring, and space weather research. Meanwhile,NS210MAlso providedGPSSignal processing source code, includingGPS CDMASignal related receptionC/ACode generation, satelliteDopplerFrequency shift measurementC/ACode phase measurement, spectrum analysis, graphical display interface, etcMatlabSoftware source code.

Main purpose

◆ SoftwareGPSReceiver design and development;

◆ Attitude measurement;

◆GPSMeteorological research;

◆GPSChip and receiver design and development;

◆GPSInterference and anti-interference research;

◆GPSCarrier phase research and application research;

Research on multipath interference;

◆GPSSignal analysis;

◆ High sensitivityGPSResearch on search and tracking algorithms;

◆ High precisionGPSResearch on receiver algorithms.

TECHNICAL INDEX

◆ Received signal:GPS L1Frequency（1575.42MHz）
◆ Distance measurement code:C/Aa sign or object indicating number
◆ Signal bandwidth:2MHz
Sampling frequency:16.367667MHz
Sampling width:2bit
◆ Digital intermediate frequency:4.123968MHz
◆ Computer interface:USB2.0
◆ Antenna interface:SMA
◆ Antenna:5VDCactive antenna
◆GPSData acquisition capability: continuous sampling with set duration（50Milliseconds100Milliseconds200Milliseconds400Milliseconds1000Milliseconds12000Milliseconds30000Milliseconds60000Millisecond, unlimited continuous sampling)
◆ Power supply:USBInterface power supply or external connection5VDCpower supply
◆ Digital intermediate frequency output capability:2×16Mbps、2×8Mbps、2×4Mbps、2×1Mbps、2×0.5Mbps
◆ Size:97x40x135mm
◆ Weight:500can

Figure 1: If the user needs to output the power spectrum of the sampled data, it can be obtained through the Spectrum control. The callback function for this control is showpsd_callback.

The power spectrum diagram is shown in the following figure:

Figure 2: Select the satellite to be analyzed and output the corresponding result graph. The C/A code phase control is used to output the waveform of the corresponding satellite C/A code signal and mark the synchronized code phase points. The callback function for this control is showphased c_callback. This callback function calls the generatecacode() function in the generatecacode.m file to generate local C/A code.

Figure 3. The Correlation Peak control is used to display the correlation values obtained when searching on a two-dimensional plane composed of C/A code phase and Doppler frequency shift. The callback function for this control is showcorrb_Callback. The display interface is shown above.