CN113676216B - Method for angle error demodulation by using frequency hopping signal - Google Patents
Method for angle error demodulation by using frequency hopping signal Download PDFInfo
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- CN113676216B CN113676216B CN202110801611.6A CN202110801611A CN113676216B CN 113676216 B CN113676216 B CN 113676216B CN 202110801611 A CN202110801611 A CN 202110801611A CN 113676216 B CN113676216 B CN 113676216B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
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- H04L2027/0024—Carrier regulation at the receiver end
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a method for demodulating angle error by using frequency hopping signals, which comprises the following steps: s1, acquiring characteristics and signal-to-noise ratio conditions of the target signal to obtain a detection result; s2, according to the detection result, combining with the non-cooperative target, intercepting the broadband signal of the central position in the signal frequency band by using a receiver to enter an AGC loop, and simultaneously gating the sum signal to enter the AGC loop for operation; and S3, performing output accumulation filtering processing on the final angle error by using the cross-correlation characteristic of the sum-difference channel signal. In order to obtain better demodulation performance, reduce the influence of no-signal falling time period on final output and realize short-time energy detection on sum channel signals, the invention adopts a specific frequency synthesizer to fix a local oscillator and an input signal and mixes the fixed oscillator and the input signal to achieve the final angle error demodulation effect.
Description
Technical Field
The invention relates to the technical field of frequency hopping signals, in particular to a method for demodulating angle errors by using frequency hopping signals.
Background
The frequency hopping system has some defects and limitations, the signal hiding performance is poor, the multi-frequency interference resistance and tracking type interference resistance are limited, and the like.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for demodulating the angle error by using the frequency hopping signal, which has the advantage of better demodulation performance.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for performing angular error demodulation using a frequency hopping signal, comprising the steps of:
s1, acquiring characteristics and signal-to-noise ratio conditions of the target signal to obtain a detection result;
s2, according to the detection result, combining with the non-cooperative target, intercepting the broadband signal of the central position in the signal frequency band by using a receiver to enter an AGC loop, and simultaneously gating the sum signal to enter the AGC loop for operation;
and S3, performing output accumulation filtering processing on the final angle error by using the cross-correlation characteristic of the sum-difference channel signal.
In the technical scheme, by analyzing the characteristics of the actual target acquisition signal and the signal-to-noise ratio condition and combining the non-cooperative target in the technical scheme, the receiver intercepts part of broadband signals at the center position in the whole signal frequency band in real time, and performs final angular error demodulation by using the cross-correlation characteristic of sum and difference channel signals. According to the technical scheme, the frequency synthesizer (6120-7470 MHz) is adopted, the fixed local oscillator 5240MHz and the input signal (950-2300 MHz) are mixed to 70MHz, better demodulation performance is obtained, the influence of a no-signal falling time period on final output is reduced, and short-time energy detection of a sum channel signal is realized.
In a further aspect, step S1 includes:
s1.1, presetting a processing interval of a signal broadband;
s1.2, a threshold value threshold is preset, and whether the target signal falls into the processing interval or not is judged.
In the technical scheme, in order to obtain better demodulation performance, the influence of a no-signal falling time period on final output is reduced, short-time energy detection is carried out on a sum channel signal, a detection result is compared with a set threshold, if the sum channel signal exceeds the threshold, a signal falls, the signal of the detection section is synchronously gated to enter a subsequent angle error output accumulation filtering processing link, and meanwhile, a sum channel signal enters an AGC loop to carry out operation.
In a further aspect, S1.1 comprises:
the working center frequency of the receiver is preset to be 70MHz, the signal broadband is selected to be a detection section of 20MHz, and random signals falling into the detection section are processed.
In the technical scheme, the working center frequency of the tracking receiver is 70MHz, the signal broadband is selected to be 20MHz, and the signals fall into the processing interval randomly in a time-sharing manner in the 20MHz waiting band.
In a further technical solution, step S1.2 includes:
obtaining a detection result larger than a preset threshold value, judging that the target signal falls into the processing interval, and
synchronously gating the signal falling into the processing section to step S2;
and obtaining a detection result smaller than a preset threshold, judging that the target signal does not fall into the processing interval, and discarding the signal.
In this solution, the signal is discarded so that it does not affect the final angular error output. Since the probability that the non-cooperative target falls within the signal detection band is not fixed, the slope of the angular error voltage needs to be demodulated according to the falling probability.
In a further aspect, step S2 includes:
and the sum and difference input signals are respectively subjected to frequency conversion, then are sent to an AGC amplifier through a filter, and are subjected to AD conversion into digital signals after gain control is completed to a proper amplitude.
In the technical scheme, sum and difference input signals are respectively subjected to frequency conversion, then are sent to an AGC amplifier through a filter, and are subjected to AD conversion into digital signals after gain control is completed to a proper amplitude.
In a further technical solution, step S2 further includes:
carrying out energy detection and amplitude detection on the sum path signal;
and presetting a threshold A, determining whether the current signal is an effective satellite signal according to the threshold A and the frequency modulation signal, taking the effective satellite signal as an effective switch control signal of AGC voltage and error voltage, and sending the effective switch control signal to an AGC and error voltage output control circuit.
In a further aspect, step S3 includes:
energy detection is carried out in the FPGA in the form of digital quantity by utilizing the cross-correlation characteristic of the sum channel signal and the difference channel signal, and meanwhile, an error voltage is formed through an AGC voltage.
In the technical scheme, sum and difference signal cross correlation and energy detection and AGC voltage generation error voltage are performed in an FPGA in a digital quantity mode.
In a further technical solution, step S3 further includes:
performing cross-correlation processing on the sum and difference signals, and simultaneously orthogonally separating azimuth pitching error voltages;
and when the effective switch control signal is obtained, the effective switch control signal is output to the ACU after passing through the low-pass filter and the monitoring change-over switch.
In a further technical solution, step S3 further includes:
carrying out AGC amplitude detection on the sum-path signal after effective switching signal control to obtain AGC voltage, transmitting the AGC voltage to an AD front end, and outputting the AGC voltage to an ACU;
and after AGC amplitude detection, setting a threshold B, comparing the threshold B with the sum-difference channel signal to judge whether the current signal is an on-satellite effective signal, determining the current signal as an on-satellite effective signal if the current signal is higher than the threshold B, and sending a locking indication to the ACU.
In a further technical solution, step S3 further includes:
and carrying out output accumulation filtering processing on the final angle error by using the synchronous gating broadband signal and the sum path signal.
The invention has the beneficial effects that:
(1) the invention adopts a specific frequency synthesizer, fixes the local oscillator and the input signal, and mixes the frequency of the local oscillator and the input signal to achieve the final angle error demodulation effect;
(2) the invention has better demodulation performance;
(3) the invention reduces the influence of the no-signal falling time period on the final output, and realizes the short-time energy detection of the sum channel signal.
Drawings
Fig. 1 is a flow chart of a method for demodulating an angle error by using a frequency hopping signal according to the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The embodiment is as follows:
as shown in fig. 1, the present invention provides a method for demodulating an angle error by using a frequency hopping signal, comprising the following steps:
s1, acquiring characteristics and signal-to-noise ratio conditions of the target signal to obtain a detection result;
s2, according to the detection result, combining with the non-cooperative target, intercepting the broadband signal of the central position in the signal frequency band by using a receiver to enter an AGC loop, and simultaneously gating the sum signal to enter the AGC loop for operation;
and S3, performing output accumulation filtering processing on the final angle error by using the cross-correlation characteristic of the sum-difference channel signal.
In this embodiment, by analyzing the characteristics of the actual target acquisition signal and the signal-to-noise ratio condition and combining the non-cooperative target in this embodiment, the receiver intercepts a part of the broadband signal at the center position in the entire signal band when it is implemented, and performs final angular error demodulation by using the cross-correlation characteristic of the sum-difference channel signal. In the embodiment, frequency synthesis (6120-7470 MHz) is adopted, and a fixed local oscillator 5240MHz and an input signal (950-2300 MHz) are mixed to 70MH, so that better demodulation performance is obtained, the influence of a no-signal falling time period on final output is reduced, and short-time energy detection of a sum channel signal is realized.
In another embodiment, step S1 includes:
s1.1, presetting a processing interval of a signal broadband;
s1.2, presetting a threshold, and judging whether a target signal falls into the processing interval.
In this embodiment, in order to obtain better demodulation performance, reduce the influence of no-signal falling time period on final output, and implement short-time energy detection on the sum channel signal, the detection result is compared with a set threshold, if the sum channel signal exceeds the threshold, it is determined that a signal falls, the signal of the detection section is synchronously gated to enter a subsequent angular error output accumulation filtering processing link, and meanwhile, the gated sum channel signal enters an AGC loop for operation.
In another embodiment, S1.1 comprises:
the working center frequency of the receiver is preset to be 70MHz, the signal broadband is selected to be a detection section of 20MHz, and random signals falling into the detection section are processed.
In this embodiment, the operating center frequency of the tracking receiver is 70MHz, the signal bandwidth is selected to be 20MHz, and in the 20MHz waiting band, the signals fall into the processing interval randomly in a time-sharing manner.
In another embodiment, step S1.2 comprises:
obtaining a detection result larger than a preset threshold value, judging that the target signal falls into the processing interval, and
synchronously gating the signal falling into the processing section to step S2;
and obtaining a detection result smaller than a preset threshold, judging that the target signal does not fall into the processing interval, and discarding the signal.
In this embodiment, the signal is discarded so that it does not affect the final angular error output. Since the probability that the non-cooperative target falls within the signal detection band is not fixed, the slope of the angular error voltage needs to be demodulated according to the falling probability.
In another embodiment, step S2 includes:
and the sum and difference input signals are respectively subjected to frequency conversion, then are sent to an AGC amplifier through a filter, and are subjected to AD conversion into digital signals after gain control is completed to a proper amplitude.
In this embodiment, the sum and difference input signals are respectively subjected to frequency conversion, and then sent to the AGC amplifier through the filter, and after the gain control is completed to a proper amplitude, AD conversion is performed to a digital signal.
In another embodiment, step S2 further includes:
carrying out energy detection and amplitude detection on the sum path signal;
and presetting a threshold A, determining whether the current signal is an effective satellite signal according to the threshold A and the frequency modulation signal, taking the effective satellite signal as an effective switch control signal of AGC voltage and error voltage, and sending the effective switch control signal to an AGC and error voltage output control circuit.
In another embodiment, step S3 includes:
energy detection is carried out in the FPGA in the form of digital quantity by utilizing the cross-correlation characteristic of the sum channel signal and the difference channel signal, and meanwhile, an error voltage is formed through an AGC voltage.
In the embodiment, the sum and difference signal cross correlation and the energy detection, AGC voltage generation error voltage are then performed in the FPGA in the form of digital quantity.
In another embodiment, step S3 further includes:
performing cross-correlation processing on the sum and difference signals, and simultaneously orthogonally separating azimuth pitching error voltages;
and when the effective switch control signal is obtained, the effective switch control signal is output to the ACU after passing through the low-pass filter and the monitoring change-over switch.
In another embodiment, step S3 further includes:
carrying out AGC amplitude detection on the sum-path signal after effective switching signal control to obtain AGC voltage, transmitting the AGC voltage to an AD front end, and outputting the AGC voltage to an ACU;
and after AGC amplitude detection, setting a threshold B, comparing the threshold B with the sum-difference channel signal to judge whether the current signal is an on-satellite effective signal, determining the current signal as an on-satellite effective signal if the current signal is higher than the threshold B, and sending a locking indication to the ACU.
In another embodiment, step S3 further includes:
and carrying out output accumulation filtering processing on the final angle error by using the synchronous gating broadband signal and the sum path signal.
In the above embodiment, on the one hand, energy detection amplitude detection is performed on the sum-path signal, since a frequency modulation signal appears instantaneously, a threshold B is given here, whether the current signal is an effective satellite signal is determined by comparison and decision, and the current signal is used as an on-off control signal for which the AGC voltage and the error voltage are effective and is sent to an AGC and error voltage output control circuit. After AGC amplitude detection, the AGC amplitude is compared and judged with a given threshold value A (locking threshold), if the AGC amplitude is higher than the threshold value A, the satellite effective signal is determined to be received, and a locking indication is sent to the ACU.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (3)
1. A method for performing angular error demodulation using frequency hopping signals, comprising the steps of:
s1, acquiring characteristics and signal-to-noise ratio conditions of the target signal to obtain a detection result;
s2, according to the detection result, combining with the non-cooperative target, intercepting the broadband signal of the central position in the signal frequency band by using a receiver to enter an AGC loop, and simultaneously gating the sum signal to enter the AGC loop for operation;
s3, carrying out output accumulation filtering processing on the final angle error by using the cross-correlation characteristic of the sum-difference channel signal;
the step S1 includes:
s1.1, presetting a processing interval of a signal broadband;
s1.2, presetting a threshold, and judging whether a target signal falls into the processing interval or not;
said step S1.1 comprises:
presetting receiver working center frequency as 70MHz, selecting 20MHz detection segment for broadband signal, and processing random signal falling into detection segment;
the step S2 further includes:
carrying out energy detection and amplitude detection on the sum path signal;
presetting a threshold A, determining whether the current signal is an effective satellite signal according to the threshold A and the frequency modulation signal, taking the effective satellite signal as an effective switch control signal of AGC voltage and error voltage, and sending the effective switch control signal to an AGC and error voltage output control circuit;
the step S3 includes:
energy detection is carried out in an FPGA in a digital quantity mode by utilizing the cross-correlation characteristic of sum and difference channel signals, and meanwhile, an error voltage is formed through AGC voltage;
the step S3 further includes:
performing cross-correlation processing on the sum and difference signals, and simultaneously orthogonally separating azimuth pitching error voltages;
after obtaining the effective switch control signal, the effective switch control signal is output to the ACU after passing through the low-pass filter and the monitoring change-over switch;
or the step S3 further includes:
carrying out AGC amplitude detection on the sum-path signal after effective switching signal control to obtain AGC voltage, transmitting the AGC voltage to an AD front end, and outputting the AGC voltage to an ACU;
and after AGC amplitude detection, setting a threshold B, comparing the threshold B with the sum-difference channel signal to judge whether the current signal is an on-satellite effective signal, determining the current signal as an on-satellite effective signal if the current signal is higher than the threshold B, and sending a locking indication to the ACU.
2. The method according to claim 1, wherein the step S1.2 comprises:
obtaining a detection result larger than a preset threshold, judging that a target signal falls into the processing interval, synchronously gating the signal falling into the processing interval, and entering the step S2;
and obtaining a detection result smaller than a preset threshold, judging that the target signal does not fall into the processing interval, and discarding the signal.
3. The method for demodulating angle error with frequency hopping signal according to claim 1, wherein said step S3 further comprises:
and carrying out output accumulation filtering processing on the final angle error by using the synchronous gating broadband signal and the sum path signal.
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