A delay calibration method for altboc signal
A calibration method and signal technology, applied in the fields of digital signal processing, satellite navigation, and time frequency
Active Publication Date: 2018-01-30
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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Problems solved by technology
[0006] The technical solution problem of the present invention is: aim at AltBOC signal, propose a kind of effective time-delay calibration method, this method can solve the problem of calibration of transmission time delay of each branch of the upper and lower sideband of AltBOC signal and the problem of calibration of overall signal transmission time delay, At the same time, the method is compatible with the delay calibration of BPSK signal and QPSK signal
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[0045] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0046] figure 1 It is a connection diagram of the equipment involved in the method of the present invention. The AltBOC signal time delay calibration system involved in the method of the present invention includes AltBOC signal transmitting equipment, time-frequency signal generating equipment, high-speed signal acquisition device, time delay processing device, trigger signal cable and radio frequency signal cable.
[0047] figure 2 It is the realization flow chart of the method of the present invention. The main steps of the inventive method are as follows:
[0048] (1) Build the AltBOC signal delay calibration system: according to figure 1 The AltBOC signal transmitting equipment, time-frequency signal generating equipment, high-speed signal acquisition device, delay processing device, trigger signal cable and radio frequency signal cable are connected...
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The invention discloses a time delay calibration method of an AltBOC signal. The method combines the characteristics of the AltBOC signal to synthesize the equivalent spread spectrum code of the overall signal. By building an AltBOC signal time delay calibration system, a high-speed signal acquisition device is used to collect and store the preset length AltBOC signal; down-convert the collected and stored AltBOC signal to baseband, and then perform correlation calculations with the spreading codes of each branch of the upper and lower sidebands and the equivalent spreading code of the overall signal; calculate the AltBOC by searching for the position of the correlation peak Signal link delay value; finally, after deducting the delay value of the trigger signal cable and the delay value of the radio frequency signal cable from the link delay value, the delay value of the AltBOC signal is obtained. This method can complete all the calibration of the overall AltBOC signal delay and the delay of each branch of the upper and lower sideband signals under the condition of one acquisition of the AltBOC signal, and is compatible with the delay calibration of the BPSK signal and the QPSK signal.
Description
technical field [0001] The invention relates to the fields of satellite navigation, time frequency, digital signal processing and the like, and in particular relates to the problem of time delay calibration of satellite navigation AltBOC signal transmitting equipment. Background technique [0002] The satellite navigation system performs ranging and positioning based on the Time of Arrival (TOA) principle, that is, the technique of pseudo-code ranging is used to measure the time elapsed by the signal from the transmission source of the known position to the user receiver, and the pseudo-range measurement is used The method can obtain the combined time delay from the transmitting source to the receiver. Since the system needs to accurately process the time delay value of the transceiver equipment in the navigation system when processing data, the time delay of the transceiver equipment is one of the most important error items in satellite positioning and navigation. The time...
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IPC IPC(8): G01S19/01
CPCG01S19/01
Inventor 刘轶龙魏海涛尹继凯翟江鹏树玉泉
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP