Study Of Track Before Detect Algorithm

Track before detect (TBD) is an algorithm to process the received signal directly. The algorithm can get exact detection and track at the same time. Classical processing is to implement tracking algorithm after threshold processing. Comparing to the classical tracking algorithm, TBD fully uses the information hiding in measurement. So it's a useful algorithm to detect and track target in low signal noise ratio environment.This article mainly studies how to carry out TBD by dynamic programming algorithm and particle filter. Then the principle and the application of over the horizon radar (OTHR) are introduced. After giving the model of TBD of OTHR, the two kinds of algorithms are used to carry out the TBD of OTHR. Mainly content of the article is:(1) Introduce dynamic programming and particle filter based TBD, including their system models and measurement models, the framework of the algorithms, the using bounds, their advantages and disadvantages.(2) Establish the target and measurement models of over horizon radar. The received output signals in the same range gate form observament after windowed Doppler processing. Then the two algorithms are used to carry out TBD of OTHR.In the end, we will summarize the two algorithms, and point out the problems can't be solved.