CN1057651C - JTIDS signal direction finding and hopping-relieving intercept receiving method based on first-order bandpass sampling - Google Patents
JTIDS signal direction finding and hopping-relieving intercept receiving method based on first-order bandpass sampling Download PDFInfo
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- CN1057651C CN1057651C CN98101618A CN98101618A CN1057651C CN 1057651 C CN1057651 C CN 1057651C CN 98101618 A CN98101618 A CN 98101618A CN 98101618 A CN98101618 A CN 98101618A CN 1057651 C CN1057651 C CN 1057651C
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Abstract
The present invention discloses a JTIDS signal direction finding and hopping-relieving interception receiving method based on a first-order band pass sampling. According to the characteristics of the carrier frequency distribution of JTIDS signals, signal spectrums appearing on different carrier frequencies at different times can be removed to the position of the same frequency spectrum by designing appropriate low and medium frequency, a frequency-shift channel number and a first-order band pass sampling frequency. Thus, the direction finding and hopping-relieving interception receiving treatment of the JTIDS signals can be effectively realized. A JTIDS signal direction finding and hopping-relieving interception receiving integrating system manufactured according to the method has the characteristics of simple equipment, favorable performance, convenient use, etc., and has popularization value.
Description
The present invention relates to the direction finding and the hopping-relieving intercept receiving method of joint tactical information distribution system (the being called for short JTIDS) signal in the signal reconnaissance field, receipts are detectd in the high-precision direction finding and the full detail intercepting and capturing that are specially adapted to the JTIDS signal.
JTIDS is the communication system of U.S. army's antielectron antagonism, is characterized in time division multiple access, jumps and expands combination, has extremely strong anti-intercepting and capturing, direction finding, interference performance.
The frequency hopping point of JTIDS is to be at interval equally distributedly to 1008MHz, 1053M to 1065MHz, 1113 to 1206MHz three frequency ranges to have 51 frequency hopping points 969 with 3MHz.
JTIDS signal residence time only is 6.4 microseconds, and the repetition period is 26 microseconds, and signal bandwidth is about 3.5MHz.
Because the JTIDS signal has high hop rate, therefore utilize common direction-finding method to be difficult to its direction finding, it is separated jump that to detect receipts then more difficult.And because the relation of its stepped-frequency interval and signal bandwidth, utilize the direction finding of the Frequency Hopping Signal that the inventor proposes in Chinese patent, the patent No. are " based on the Frequency Hopping Signal direction finding and the intercept receiving method of first-order bandpass sampling " patent of 98101616.2 can not conciliate jumping to its direction finding with intercept receiving method and detect receipts.
At present, the JTIDS signal direction-finding is received comparatively that effective method is to utilize channelizing reception technique (need all be connected with a receive channel to 51 frequency hopping points) with separating to jump to detect, but implement very complexity of hardware, cost is very high.
The objective of the invention is to avoid the weak point in the above-mentioned background technology and provide a kind of the JTIDS signal is separated to the same low frequency to jump at the frequency spectrum shift that occurs on the different carrier frequency handle JTIDS signal direction-finding and hopping-relieving intercept receiving method that the full detail of JTIDS signal is all remained based on first-order bandpass sampling.And the present invention also have suitable with channelizing separate to jump detect the fruit of producing effects, the JTIDS signal integrated test of realizing according to the inventive method is to jumping interception system and have equipment and form characteristics such as simple, that performance is good, easy to use, with low cost with separating.
The object of the present invention is achieved like this, and method of the present invention comprises following technical measures:
Utilizing the JTIDS signal is time division multiple access, be to have only the work of an information issue source each time period, and the frequency hopping point be with 3MHz be at interval 969 to 1008MHz, 1052 to 1065MHz, even these two features that distribute on 1113 to 1206MHz three frequency ranges, and use is based on the Frequency Hopping Signal direction finding and the intercept receiving method of first-order bandpass sampling.
Method of the present invention also comprises the technical measures step:
(1) utilize multiple frequency shift filtering and first-order bandpass sampling that signal bandwidth is 3.5MHz, channel spacing is that the JTIDS signal of 3MHz obtains not having the signal that mixes same Low Medium Frequency repeatedly;
During (2) only to the JTIDS signal direction-finding, remove broad-band channel filter and frequency shift filter, only connect the band Low Medium Frequency filter of having a lot of social connections.
Purpose of the present invention can also reach by following technical measures:
Is 3.5MHz with first-order bandpass sampling to signal bandwidth, and channel spacing is the technical measures step that the signal of the JTIDS of 3MHz obtains not having the signal that mixes same Low Medium Frequency repeatedly:
(1) according to the bandwidth of JTIDS signal, the way q of channel spacing design frequency shift filter;
(2), and design centre frequency and the sample rate of signal when Low Medium Frequency of different carrier frequency by the optimum sampling frequency selection purposes formula of first-order bandpass sampling according to bandwidth, channel spacing, the frequency shift filter way of JTIDS signal.
The present invention compares background technology following advantage:
(1) the present invention only increases broadband Low Medium Frequency channel filter and frequency shift filter in the direction-finding equipment (array df equipment) of routine, therefore the integrated test that can realize the JTIDS signal based on first-order bandpass sampling is made simple, with low cost to detecing receipts with separating to jump.
(2) the present invention can realize the full signal information acquisition to each jumping of JTIDS signal, and its effect is suitable with the channelizing equipment that realization is complicated, cost is high, so performance is good.
(3) the present invention and all easy to use based on equipment of the present invention has application value.
Below in conjunction with drawings and Examples the present invention is described in further detail.
Fig. 1 and Fig. 2 are respectively the electric functional-block diagrams of two kinds of embodiment of the present invention.
With reference to Fig. 1, embodiments of the invention Fig. 1 is made up of aerial array and duplexer battle array 1, zero-signal source, school 2, multichannel receiver 3, frequency synthesizer 4, bandpass sampling and signal detector 5, sampling clock generator 6, integrated treatment and watch-dog 7, broad-band channelization (Low Medium Frequency) filter 8, frequency shift filter 9.Wherein embodiment multichannel receiver 3 is made of 4 and the multichannel receiver 3-1 to 3-4 that connects, each multichannel receiver 3-1 to 3-4 connects 3 broad-band channel filter 8-1-1 that cover three frequency ranges of JTIDS signal respectively, 8-1-2,8-1-3 to 8-4-1,8-4-2,8-4-3, each broad-band channel filter 8-1-1,8-1-2,8-1-3 to 8-4-1,8-4-2,8-4-3 connects 3 frequency shift filter 9-1-1-1 respectively, 9-1-1-2,9-1-1-3 to 9-4-3-1,9-4-3-2,9-4-3-3, the output of these frequency shift filters 9 all is connected to bandpass sampling and signal detector 5.
With reference to Fig. 2, the composition of embodiments of the invention Fig. 2 is to simplify from the composition of embodiment Fig. 1.The composition of equipment has wherein removed frequency shift filter 9, and the back level of each multichannel receiver 3-1 to the 3-4 broadband Low Medium Frequency filter 8 that only to connect a bandwidth be 20MHz.Embodiment Fig. 2 only is used for the direction finding to the JTIDS signal.
The method of in Chinese patent, the patent No. are " based on the Frequency Hopping Signal direction finding and the intercept receiving method of first-order bandpass sampling " patent of 98101616.2, introducing according to the inventor, the principle that realizes the inventive method is as follows: according to two features of JTIDS signal frequency point appearance, common Frequency Hopping Signal direction finding is formed with the channel of detecing receipts and moving of frequency spectrum improved to being used for, utilizing Chinese patent, the patent No. then is sample frequency method for designing design sample frequency in 98101616.2, and sampling, carry out information processing again.
Detailed method is as follows: the centre frequency of supposing bandpass signal is ω
C, bandwidth is 2 ω
B, then [0, ω
C-ω
B] in can place at most
The positive frequency spectrum of individual signal, wherein " X " expression is no more than the maximum integer of X, when choosing frequency translation coefficient n and satisfy 0≤n≤m, can get the optimum sampling frequencies omega
OFor
Consider the indirect problem of first-order bandpass sampling during design, promptly how to determine the centre frequency of each signal, could all move the signal that occurs on the different center frequency to same frequency by an identical sample frequency.By formula (2) as can be known, select centre frequency
Get final product.Because the bandwidth of JTIDS signal is 3.5MHz, channel spacing is 3MHz, does not therefore have a ω
O, make that utilizing one tunnel sampling promptly to obtain not having the same Low Medium Frequency signal that mixes repeatedly exports, and satisfy (3) formula.In order both to satisfy (3) formula, guarantee that again not having sampling mixes repeatedly, then carries out following improvement.Concrete grammar is to use q identical frequency shift filter 9 in each broad-band channel filter 8 back, by the different local frequency of frequency of utilization synthesizer 4 outputs the JTIDS signal is carried out shift frequency, make the output signal frequency successively low 3MHz of same signal at this q frequency shift filter 9, utilize optimum sampling frequency 3qMHz respectively to the output signal sampling of q frequency shift filter 9 then, can guarantee must have in the sampled signal of q road one tunnel output like this is not have to mix repeatedly.
Be 3.5MHz according to signal bandwidth among embodiment Fig. 1, channel spacing is that 3MHz chooses q=3, and this moment, best bandpass sampling frequency was ω
O=9MHz is known by formula (3), does not have the centre frequency of mixing road signal repeatedly and should be 2.25MHz, 11.25MHz, 20.25MHz ..., the signal after sampling this moment is moved on the low frequency that centre frequency is 2.25MHz.Because can obtaining one the tunnel, embodiment Fig. 1 do not have mixed signal repeatedly, and the JTIDS signal is time-division work, each time period has only a signal, so direction finding handles and can use traditional interferometer processing method or temporal difference method, and embodiment uses modern array df method.To collect mail number in order obtaining having jumping to detect, to need to utilize the comparatively simple constraint wave beam formation method of not having that realizes than separating of high s/n ratio.
Owing to do not take the shift frequency measure, can not guarantee to obtain not having to mix signal repeatedly, so the use of direction finding Processing Example has the array df method of many signal handling capacities among embodiment Fig. 2.
The bay that aerial array and 4 of duplexer battle array 1 usefulness are positioned at the space diverse location in embodiment of the invention Fig. 1 and the illustration 2 receives the JTIDS signal of spatial transmission, be input to multichannel receiver 3, deliver to broad-band channel filter 8 and frequency shift filter 9 (in embodiment Fig. 2, not having frequency shift filter 9) after 3 pairs of signal frequency conversions of multichannel receiver and the amplification, after filtering, import in bandpass sampling and the signal detector 5, move same low frequency with first-order bandpass sampling, and detect mixed that road signal repeatedly of nothing.
2 its effects of zero-signal source, school are the calibrating signals that produce on the required direction finding frequency, select to be input to each channel of multichannel receiver 3 by aerial array and duplexer battle array 1, with the amplitude and the phase place inconsistency of calibration channel.Frequency synthesizer 4 is used to provide the local vibration source frequency signal of multichannel receiver 3, expansion for the ease of channel number, the local vibration source signal adopts the mode of serial connection along separate routes, promptly the local vibration source signal of N-1 channel is that local oscillation signal by N channel provides, and makes broad-band channel filter 8 cover corresponding frequency hopping bandwidth.
The effect of broad-band channel filter 8 is that frequency-division section covers whole frequency hopping bandwidth among the embodiment, makes to obtain whole frequency hopping points, can reduce again disturb and noise to direction finding and detect the influence of receipts.The effect of frequency shift filter 9 is to obtain one the tunnel not have and mix signal repeatedly and be used to separate jump and detect receipts.
The effect of bandpass sampling and signal detector 5 is that bandpass sampling is carried out in the output of corresponding frequency shift filter 9, and detects mixed that road signal repeatedly of nothing.The effect of sampling clock generator 6 is the needs according to system, produces required sampled clock signal.Through the result of bandpass sampling and signal detector 5 processing, input to integrated treatment and watch-dog 7 and carry out the direction finding processing, and form digital beam, the JTIDS signal to be separated to jump to detect receive processing, this unit also is used for the monitoring of entire equipment and the setting of AGC.
Broadband Low Medium Frequency filter 8 among embodiment Fig. 2 is used to suppress to disturb and the influence of noise to direction finding, and guarantees to have certain JTIDS signal to fall in the processing bandwidth.
Claims (2)
1. joint tactical information distribution system signal direction-finding and hopping-relieving intercept receiving method based on a first-order bandpass sampling, utilizing the joint tactical information distribution system signal is time division multiple access, be to have only the work of an information issue source each time period, and the frequency hopping point be with 3MHz be at interval 969 to 1008MHz, 1052 to 1065MHz, even these two features that distribute on 1113 to 1206MHz three frequency ranges, and use is characterized in that based on the Frequency Hopping Signal direction finding and the intercept receiving method of first-order bandpass sampling:
(1) utilize filtering of multichannel shift frequency and first-order bandpass sampling that signal bandwidth is 3.5MHz, channel spacing is that the joint tactical information distribution system signal of 3MHz obtains not having the signal that mixes same Low Medium Frequency repeatedly;
During (2) only to the joint tactical information distribution system signal direction-finding, only connect the band Low Medium Frequency filter of having a lot of social connections.
2. joint tactical information distribution system signal direction-finding and hopping-relieving intercept receiving method based on first-order bandpass sampling according to claim 1, it is characterized in that be 3.5MHz with first-order bandpass sampling to signal bandwidth, channel spacing is that the joint tactical information distribution system signal of 3MHz obtains not having the signal that mixes same Low Medium Frequency repeatedly:
(1) according to the bandwidth of joint tactical information distribution system signal, the way q of channel spacing design frequency shift filter;
(2), and design centre frequency and the sample rate of signal when Low Medium Frequency of different carrier frequency by the optimum sampling frequency selection purposes formula of first-order bandpass sampling according to bandwidth, channel spacing, the frequency shift filter way of joint tactical information distribution system signal.
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JP2008527885A (en) * | 2005-01-13 | 2008-07-24 | エヌエックスピー ビー ヴィ | Low intermediate frequency receiver and sampling method thereof |
CN103095318A (en) * | 2013-01-17 | 2013-05-08 | 陕西北斗恒通信息科技有限公司 | Anti-interference radio-frequency receiving system |
CN106301467B (en) * | 2016-09-19 | 2018-10-09 | 中国电子科技集团公司第二十研究所 | Enhance the disturbance ecology suppressing method of JTIDS waveforms based on rate |
CN113452395A (en) * | 2021-05-26 | 2021-09-28 | 中国电子科技集团公司第五十四研究所 | L frequency channel broadband signal processing device |
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US5568119A (en) * | 1993-12-21 | 1996-10-22 | Trimble Navigation Limited | Arrestee monitoring with variable site boundaries |
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