Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Secondary peak inhibition method for external radiation source radar based on single carrier digital television signal

A technology of digital TV signal and external radiation source radar, which is applied in the field of external radiation source radar signal processing, can solve problems such as false targets and affect accuracy, and achieve the effects of improving accuracy, eliminating false targets, and saving processing time

Inactive Publication Date: 2015-01-07
BEIJING INSTITUTE OF TECHNOLOGYGY
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The frame header part will periodically repeat during the entire data transmission process, and the frame header of each frame uses the same PN sequence. In different signal frames, the PN sequence is generated by the circular shift of the linear feedback shift register (LFSR). Therefore, the frame headers of each frame have a strong correlation. After the two-dimensional correlation calculation is performed using the reference signal and the echo signal, the correlation peak will appear periodically in the time dimension according to the frame length, and the target point will periodically appear in the time dimension. Peaks will cause false targets and seriously affect the accuracy of target detection

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Secondary peak inhibition method for external radiation source radar based on single carrier digital television signal
  • Secondary peak inhibition method for external radiation source radar based on single carrier digital television signal
  • Secondary peak inhibition method for external radiation source radar based on single carrier digital television signal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In this embodiment, the effective bandwidth F of the digital TV signal 0 with the baseband sampling rate F of the receiving station 1 Same, both 7.56MHz.

[0042]After channel encoding, the signal frame data length with the PN595 sequence as the frame header is 4375 (frame header part 595+system information 36+effective data segment 3744), the receiving processing system baseband sampling rate used in the present embodiment is 7.56MHz, then The length of the collected data frame L 0 Still at 4375.

[0043] The national standard single-carrier digital television signal frame header used in the present embodiment has used PN595 sequence, so the length of PN sequence namely frame header should be 595, and the length of system information is 36, then the PN595 sequence length L after sampling 1 and system information length L 2 The sum is 595+36=631.

[0044] On this basis, concrete realization steps of the present invention are as follows:

[0045] Step 1: Intercepti...

Embodiment 2

[0055] In this embodiment, the effective bandwidth F of the digital TV signal 0 with the baseband sampling rate F of the receiving station 1 Different, F 0 =7.56MHz,F 1 =9MHz.

[0056] After channel encoding, the information frame data length with the PN595 sequence as the frame header is 4375 (frame header part 595+system information 36+effective data segment 3744), the receiving processing system baseband sampling rate used in the present embodiment is 9MHz, then through The length of the collected frame data L 0 It should be 4375*9 / 7.56=5208.33. Since the fixed point in FPGA cannot represent the number less than 1, 5208.33 is now rounded to an integer. Temporarily set the frame data length at 9MHz baseband sampling rate to 5028. The reference signal that has not been de-correlated by the PN frame header is used for autocorrelation. It can be found that every 5208 points apart, there will be a correlation peak. This correlation peak is caused by the correlation of the PN...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a time dimension secondary peak inhibition method based on Chinese Standard single carrier digital television signals in external radiation source radar detection, belonging to the filed of external radiation source radar signal processing. Before an external radiation source radar system receiving station carries out coherent integration processing on digital television signals directly received from an emitting station, such as a reference signal and a target echo signal, the frame header information and system information of each signal frame in the reference signal are found, and the phase of each data bit in the frame header information and system information is changed at random. The method not only can efficiently inhibit time dimension secondary peak, but also can maintain the amplitude information of each frame header without causing frequency dimension secondary peak due to energy change before and after processing just by changing the phase information of the frame header when the correlation of each frame header is damaged, thereby improving the detection correctness of external radiation source radar based on Chinese Standard single carrier digital television signal.

Description

technical field [0001] The invention relates to a time-dimensional secondary peak suppression method in external radiation source radar detection based on national standard single-carrier digital television signals, and belongs to the field of external radiation source radar signal processing. Background technique [0002] The external radiation source radar itself does not emit signals. It utilizes non-cooperative radiation signals such as ground radio stations, television stations, communication stations, live TV satellites, navigation and positioning satellites, and active radars on various platforms. waves to obtain target information. [0003] Such as figure 1 As shown, the non-cooperative radiation source emits electromagnetic signals, and the receiving station of the external radiation source radar system uses two sets of receiving antennas, one pair of receiving antennas pointing to the transmitting station is specially used to receive the direct wave as a reference...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 卓智海单涛陶然吴洋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com