GNSS interference measurement high and intermediate time division multiplexing incoherent accumulation system and method

A non-coherent accumulation and time-division multiplexing technology, which is applied in the field of GNSS interferometric time-division multiplexing non-coherent accumulation system, can solve the problems of multi-FPGA resources, difficult to meet FPGA timing requirements, FPGA layout and wiring difficulties, etc., to reduce FPGA resources, improving timing margin, and improving utilization

Pending Publication Date: 2022-08-05
NAT SPACE SCI CENT CAS
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Problems solved by technology

However, it can be seen from the design in the figure that the shortcomings of this method are more obvious. As the value of N increases, the resources occupied by the FPGA multiplier and accumulator will increase exponentially. This increase in resources not only takes up more FPGA resources, but also At the same time, due to the increase of resources, the difficulty of FPGA layout and routing is difficult to meet the timing requirements of the entire FPGA.

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  • GNSS interference measurement high and intermediate time division multiplexing incoherent accumulation system and method
  • GNSS interference measurement high and intermediate time division multiplexing incoherent accumulation system and method
  • GNSS interference measurement high and intermediate time division multiplexing incoherent accumulation system and method

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Embodiment 1

[0050] like Figure 4 As shown, Embodiment 1 of the present invention proposes a time-division multiplexing non-coherent accumulation system for GNSS interferometric measurement, which is implemented based on FPGA. The system includes: a non-coherent accumulation module and a time-division multiplexing control logic; wherein,

[0051] Incoherent accumulation module, including accumulation calculation unit and buffer output unit; wherein,

[0052] The accumulating calculation unit includes 2 multipliers, 1 adder, and 1 accumulator;

[0053] The buffer output unit includes a buffer and a register.

[0054] The N-way interference correlation results first go through a multiplier and an adder one by one to obtain the power value I2Q2 of the interference correlation result n :

[0055] I2Q2 n =I n *I n +Q n *Q n (3)

[0056] of which: I n , Q n are the 1ms interference correlation results of I and Q of the nth channel, respectively, the subscript n ranges from 1 to N, a...

Embodiment 2

[0066] Embodiment 2 of the present invention proposes a time division multiplexing incoherent accumulation method in GNSS interferometric surveying.

[0067] The technical principle of incoherent accumulation of time division multiplexing is described in detail below:

[0068] 1) When the coherent integration time arrives, the FPGA registers the N-way interference correlation results in the previous time period, starts the coherent integration operation in this period, and starts the incoherent accumulation operation of the last coherent integration results.

[0069] 2) When N GNSS interference-related coherent integration results I and Q are registered, the timing controller starts to work, firstly controls the multiplexer to make the first I, Q results enter the multiplier, and sets the buffer address to 0 at the same time;

[0070] 3) After 2 clock cycles, the output of the adder gets the power value I2Q2 of the first channel 1 , and read the last correlation accumulation ...

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Abstract

The invention relates to the technical field of GNSS (Global Navigation Satellite System) interferometry, in particular to a GNSS interferometry high time division multiplexing incoherent accumulation system and a GNSS interferometry high time division multiplexing incoherent accumulation method, which are implemented on the basis of an FPGA (Field Programmable Gate Array), the system comprises a time division multiplexing control module and an incoherent accumulation module, wherein the time division multiplexing control module is used for time sequence control in a coherent integration time period to realize time division work of the incoherent accumulation module, and is also used for sequentially reading a path of coherent integration results to the incoherent accumulation module; and the incoherent accumulation module is used for completing time division multiplexing incoherent accumulation of each path of coherent integration result in a time division manner under time sequence control. According to the method, the time sequence characteristics of coherent integration and incoherent accumulation are ingeniously utilized, the time division multiplexing thought is utilized, large-scale incoherent accumulation operation is achieved through minimum FPGA resources, and the utilization rate of the FPGA resources and the time sequence allowance of FPGA work are greatly increased.

Description

technical field [0001] The invention relates to the technical field of GNSS interferometric altimetry, in particular to a time division multiplexing incoherent accumulation system and method for GNSS interferometric altimetry. Background technique [0002] The GNSS-R interferometric altimetry technology uses the direct correlation between the GNSS direct signal and the reflected signal to obtain the interference correlation waveform, and then inverts the pseudorange difference between the reflected signal and the direct signal, and finally inverts the sea surface height. A new GNSS remote sensing detection technology. At present, domestic and foreign GNSS navigation systems such as Beidou navigation system, GPS navigation system, Galileo navigation system, and GLONASS navigation system can all be applied by interferometric altimetry technology. [0003] The GNSS interference correlation technology is that the direct GNSS signal is directly correlated with the reflected GNSS ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/14G01S19/37
CPCG01S19/14G01S19/37
Inventor 王冬伟王先毅孙越强杜起飞白伟华蔡跃荣吴春俊夏俊明孟祥广李伟刘成李福乔颢程双双张浩张璐璐仇通胜王卓焱曹光伟
Owner NAT SPACE SCI CENT CAS
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