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Ionospheric altimeter numerical control system and method with variable radar transceiving time sequence

An ionospheric altimeter and radar transceiver technology, which is applied in the field of ionospheric detection, can solve problems such as inaccurate and difficult to achieve rapid ionospheric detection, and achieve the effect of reducing acquisition, shortening detection cycle, and reducing storage capacity

Active Publication Date: 2020-08-25
NAT SPACE SCI CENT CAS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method can make all echo signals within the detection height range be received by the altimeter, but it will cause the system to receive noise signals for a long time instead of effective echo signals, making it difficult to quickly detect the ionosphere

Method used

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  • Ionospheric altimeter numerical control system and method with variable radar transceiving time sequence
  • Ionospheric altimeter numerical control system and method with variable radar transceiving time sequence
  • Ionospheric altimeter numerical control system and method with variable radar transceiving time sequence

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Embodiment 1

[0072] Such as figure 2 As shown, Embodiment 1 of the present invention provides a numerical control system for an ionospheric altimeter with variable sending and receiving delays. The numerical control system of the altimeter completes the generation of the emission signal and the processing of the echo signal in the AX7020 and the self-made circuit board, including the following modules: radar timing generation module, code sequence reading module, signal generation module, analog-to-digital conversion module, digital download Frequency conversion module, data packaging module, data cache module and upper computer data processing module.

[0073] The radar timing generation module uses the VHDL language programming method to complete the generation of the altimeter sending and receiving timing signals according to the principle of variable delay sending and receiving timing, controls the progress of the timing of the altimeter, and divides the transmission control signal an...

Embodiment 2

[0108] Based on the above system, Embodiment 2 of the present invention proposes a numerical control method for an ionospheric altimeter with variable radar transceiver timing, the method comprising:

[0109] The radar timing generation module sets the delay time between the generation of the emission control signal and the reception control signal according to the radar detection frequency, and alternately generates the emission control signal and the reception control signal for controlling the ionospheric altimeter to send and receive signals according to the delay time;

[0110] The code sequence reading module reads the binary code element from the Block RAM, and sends the binary code element to the signal generation module as a phase modulation code sequence of the transmitted signal;

[0111] Under the control of the transmission control signal, the signal generation module performs phase modulation on the received binary symbols to generate a transmission signal and a c...

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Abstract

The invention discloses an ionospheric altimeter numerical control system and method with a variable radar transceiving time sequence. The ionospheric altimeter numerical control system and method areused for setting transceiving delay according to radar detection frequency, generating a time sequence control signal, controlling an ionospheric altimeter to generate a used transmitting signal under the enabling of the time sequence signal and processing an echo signal reflected by an ionospheric layer. The system is realized through an FPGA and comprises a radar time sequence generation module, a coding sequence reading module, a signal generation module, an analog-to-digital conversion module, a digital down-conversion module, a data packaging module and a data caching module, transmitting and receiving delay is set according to transmitting frequency, and a receiving channel is closed after an ionospheric altimeter receives an echo signal; compared with the mode of taking the transceiving delay corresponding to the maximum detection height as the receiving time, the receiving time of the altimeter is effectively reduced, and the detection period of the system is shortened.

Description

technical field [0001] The invention relates to the field of ionospheric detection, in particular to a numerical control system and method for an ionospheric altimeter with a variable radar sending and receiving time sequence. Background technique [0002] The ionospheric altimeter is a relatively mature and widely used ground ionospheric detection equipment. It emits high-frequency electromagnetic waves with a frequency of 1-30MHz vertically upward. When the emission frequency is equal to the ionospheric plasma frequency, the electromagnetic waves are reflected. By obtaining The time when the reflected signal arrives at the receiver draws the ionospheric frequency height map, and inverts the characteristic parameters of the ionosphere. In the sending and receiving sequence of the ionospheric altimeter, the altimeter uses the sending and receiving delay corresponding to the maximum detection height as the receiving time. When the transmitting signal is completed, the receivi...

Claims

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Application Information

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IPC IPC(8): G01S13/88G01S7/28
CPCG01S13/882G01S7/28G01S7/2806Y02A90/10
Inventor 靳梦雅郭伟刘鹏王彩云王特
Owner NAT SPACE SCI CENT CAS
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