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Low-interception velocity measurement method and radar device

A speed-measuring radar and low-interception technology, which is applied in measuring devices, radio wave measurement systems, radio wave reflection/re-radiation, etc., can solve problems such as reducing the main-sub-ratio of pulse pressure output, signal identification and interception, and affecting target detection. Achieve the effects of lower sampling rate, high speed measurement accuracy and simple technology

Inactive Publication Date: 2015-10-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0006] In order to overcome the technical defects of the existing radar speed measurement that the transmitted signal is easy to be identified and intercepted due to the concentration of energy in the frequency domain, and the traditional two-phase encoded signal is easily reduced by the Doppler frequency. The invention discloses a low intercept speed measurement method and radar device

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  • Low-interception velocity measurement method and radar device
  • Low-interception velocity measurement method and radar device
  • Low-interception velocity measurement method and radar device

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Embodiment 1

[0087] This embodiment adopts the above speed measurement algorithm, wherein the transmitted signal adopts a two-phase encoded signal with frequency hopping between pulse groups.

[0088] In this example, something like Figure 5 The two-phase encoded signal with frequency hopping between pulse groups shown, its phase encoding method adopts the m-sequence generated by the 11-stage longest linear feedback shift register, and its tap coefficient is 1 0 0 0 0 0 0 0 1 0 1, The initial sequence is 1 0 0 0 1 0 1 0 0 1 , the code length is 2047, the frequency code between pulse groups adopts Costas code with N=7, and the carrier frequency in 7 FHIs is: f c1 =34.3GHz, f c2 =34.6GHz, f c3 =34GHz, f c4 =34.5GHz, f c5 =34.4GHz, f c6 =34.1GHz, f c1 =34.2GHz. Suppose the distance range measured by the speed measuring radar is: 50m-150m, and the speed measurement range is: 10m / s-70m / s. The duration of each symbol is τ= 0.1us, IF frequency is f m =1MHz, sampling rat...

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Abstract

Provided is a low-interception velocity measurement method which comprises the following steps: 1) generating a binary phase coded signal, the carrier frequency of which is fci, in the ith FHI, and emitting the binary phase coded signal, receiving an echo signal of a target to be measured and carrying out frequency mixing on the echo signal to obtain an intermediate frequency signal; 2) mixing the intermediate frequency signal with the signal itself, and carrying out band-pass filtering to obtain a square rate signal; 3) carrying out sampling on the square rate signal obtained in the step 2) and obtaining a digital sequence signal after sampling; and 4) carrying out Fourier transform on the digital sequence signal, obtaining normalized frequency corresponding to frequency domain peak value according to a frequency spectrum signal obtained after the Fourier transform, and calculating the velocity of the target to be measured. The invention also discloses a low-interception velocity measurement radar device which comprises an antenna, a controller, a two-phase modulator, a frequency synthesizer and a reception branch. The low-interception velocity measurement method and radar device effectively reduce the probability of the velocity measurement radar being intercepted by an electronic dog; and meanwhile, system sampling rate can be effectively reduced, and velocity information of a motion target is kept.

Description

technical field [0001] The invention belongs to the field of electronic communication, relates to the field of radar technology, and specifically refers to a low-intercept speed measurement method and a radar device. Background technique [0002] Because of its cheap price, high accuracy, and flexible layout, speed radar has been widely used in highway traffic control and monitoring, and is used by public security traffic control departments as the preferred tool for detecting whether vehicles are speeding. [0003] The existing speed measuring radar adopts the single-frequency continuous wave system, which has the characteristics of a very narrow emission spectrum, and uses the Doppler effect to measure the speed of the target. figure 1 It is an existing single frequency continuous wave speed measuring radar device. In the transmitting part, the controller generates the frequency by controlling the frequency source as f 0 The single-frequency continuous wave and input it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/58
CPCG01S13/58
Inventor 陈祝明张新旺洪惠宇吴天军
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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